diff --git a/CMakeLists.txt b/CMakeLists.txt
index 523d234fdf..2329422f06 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,6 +32,8 @@ endif()
 option(ENABLE_PIC "Generate position independent code (necessary for shared libraries)" TRUE)
 set(CMAKE_POSITION_INDEPENDENT_CODE ${ENABLE_PIC})
 
+set(OPENCV_MATHJAX_RELPATH "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0" CACHE STRING "URI to a MathJax installation")
+
 # Following block can break build in case of cross-compiling
 # but CMAKE_CROSSCOMPILING variable will be set only on project(OpenCV) command
 # so we will try to detect cross-compiling by the presence of CMAKE_TOOLCHAIN_FILE
diff --git a/cmake/checks/cpu_avx512skx.cpp b/cmake/checks/cpu_avx512skx.cpp
index 2faa2bfaf8..60c0c4c8e2 100644
--- a/cmake/checks/cpu_avx512skx.cpp
+++ b/cmake/checks/cpu_avx512skx.cpp
@@ -1,5 +1,17 @@
 #if defined __AVX512__ || defined __AVX512F__
 #include <immintrin.h>
+
+// Workaround for problem with GCC 5-6 in -O0 mode
+struct v_uint32x16
+{
+    __m512i val;
+    explicit v_uint32x16(__m512i v) : val(v) {}
+};
+inline v_uint32x16 operator << (const v_uint32x16& a, int imm)
+{
+    return v_uint32x16(_mm512_slli_epi32(a.val, imm));
+}
+
 void test()
 {
     __m512i zmm = _mm512_setzero_si512();
@@ -7,10 +19,13 @@ void test()
     __m256i b = _mm256_abs_epi64(a); // VL
     __m512i c = _mm512_abs_epi8(zmm); // BW
     __m512i d = _mm512_broadcast_i32x8(b); // DQ
+    v_uint32x16 e(d); e = e << 10;
+    __m512i f = _mm512_packus_epi32(d,d);
 #if defined __GNUC__ && defined __x86_64__
     asm volatile ("" : : : "zmm16", "zmm17", "zmm18", "zmm19");
 #endif
 }
+
 #else
 #error "AVX512-SKX is not supported"
 #endif
diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index 1d85d450bf..637bf51b4b 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -19,8 +19,6 @@ if(DOXYGEN_FOUND)
   unset(CMAKE_DOXYGEN_TUTORIAL_CONTRIB_ROOT)
   unset(CMAKE_DOXYGEN_TUTORIAL_JS_ROOT)
 
-  set(OPENCV_MATHJAX_RELPATH "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0" CACHE STRING "URI to a MathJax installation")
-
   set(OPENCV_DOCS_EXCLUDE_CUDA ON)
   if(";${OPENCV_MODULES_EXTRA};" MATCHES ";cudev;")
     set(OPENCV_DOCS_EXCLUDE_CUDA OFF)
diff --git a/modules/calib3d/include/opencv2/calib3d.hpp b/modules/calib3d/include/opencv2/calib3d.hpp
index 23a767e6ce..6256dec1aa 100644
--- a/modules/calib3d/include/opencv2/calib3d.hpp
+++ b/modules/calib3d/include/opencv2/calib3d.hpp
@@ -546,15 +546,14 @@ CV_EXPORTS_W void matMulDeriv( InputArray A, InputArray B, OutputArray dABdA, Ou
 @param tvec2 Second translation vector.
 @param rvec3 Output rotation vector of the superposition.
 @param tvec3 Output translation vector of the superposition.
-@param dr3dr1
-@param dr3dt1
-@param dr3dr2
-@param dr3dt2
-@param dt3dr1
-@param dt3dt1
-@param dt3dr2
-@param dt3dt2 Optional output derivatives of rvec3 or tvec3 with regard to rvec1, rvec2, tvec1 and
-tvec2, respectively.
+@param dr3dr1 Optional output derivative of rvec3 with regard to rvec1
+@param dr3dt1 Optional output derivative of rvec3 with regard to tvec1
+@param dr3dr2 Optional output derivative of rvec3 with regard to rvec2
+@param dr3dt2 Optional output derivative of rvec3 with regard to tvec2
+@param dt3dr1 Optional output derivative of tvec3 with regard to rvec1
+@param dt3dt1 Optional output derivative of tvec3 with regard to tvec1
+@param dt3dr2 Optional output derivative of tvec3 with regard to rvec2
+@param dt3dt2 Optional output derivative of tvec3 with regard to tvec2
 
 The functions compute:
 
@@ -3129,7 +3128,7 @@ namespace fisheye
     @param D Input vector of distortion coefficients \f$(k_1, k_2, k_3, k_4)\f$.
     @param Knew Camera matrix of the distorted image. By default, it is the identity matrix but you
     may additionally scale and shift the result by using a different matrix.
-    @param new_size
+    @param new_size the new size
 
     The function transforms an image to compensate radial and tangential lens distortion.
 
@@ -3155,14 +3154,14 @@ namespace fisheye
     /** @brief Estimates new camera matrix for undistortion or rectification.
 
     @param K Camera matrix \f$K = \vecthreethree{f_x}{0}{c_x}{0}{f_y}{c_y}{0}{0}{_1}\f$.
-    @param image_size
+    @param image_size Size of the image
     @param D Input vector of distortion coefficients \f$(k_1, k_2, k_3, k_4)\f$.
     @param R Rectification transformation in the object space: 3x3 1-channel, or vector: 3x1/1x3
     1-channel or 1x1 3-channel
     @param P New camera matrix (3x3) or new projection matrix (3x4)
     @param balance Sets the new focal length in range between the min focal length and the max focal
     length. Balance is in range of [0, 1].
-    @param new_size
+    @param new_size the new size
     @param fov_scale Divisor for new focal length.
      */
     CV_EXPORTS_W void estimateNewCameraMatrixForUndistortRectify(InputArray K, InputArray D, const Size &image_size, InputArray R,
diff --git a/modules/calib3d/src/fundam.cpp b/modules/calib3d/src/fundam.cpp
index ab2a8fb351..c5f93bcde5 100644
--- a/modules/calib3d/src/fundam.cpp
+++ b/modules/calib3d/src/fundam.cpp
@@ -72,7 +72,7 @@ public:
         // are geometrically consistent. We check if every 3 correspondences sets
         // fulfills the constraint.
         //
-        // The usefullness of this constraint is explained in the paper:
+        // The usefulness of this constraint is explained in the paper:
         //
         // "Speeding-up homography estimation in mobile devices"
         // Journal of Real-Time Image Processing. 2013. DOI: 10.1007/s11554-012-0314-1
diff --git a/modules/calib3d/src/ippe.hpp b/modules/calib3d/src/ippe.hpp
index 6dc76f59a6..986210b187 100644
--- a/modules/calib3d/src/ippe.hpp
+++ b/modules/calib3d/src/ippe.hpp
@@ -122,10 +122,10 @@ private:
      *                                  For highest accuracy the Jacobian should be computed at the centroid of the point correspondences (see the IPPE paper for the explanation of this).
      *                                  For a point (ux,uy) on the object plane, suppose the homography H maps (ux,uy) to a point (p,q) in the image (in normalized pixel coordinates).
      *                                  The Jacobian matrix [J00, J01; J10,J11] is the Jacobian of the mapping evaluated at (ux,uy).
-     * @param j00                       Homography jacobian coefficent at (ux,uy)
-     * @param j01                       Homography jacobian coefficent at (ux,uy)
-     * @param j10                       Homography jacobian coefficent at (ux,uy)
-     * @param j11                       Homography jacobian coefficent at (ux,uy)
+     * @param j00                       Homography jacobian coefficient at (ux,uy)
+     * @param j01                       Homography jacobian coefficient at (ux,uy)
+     * @param j10                       Homography jacobian coefficient at (ux,uy)
+     * @param j11                       Homography jacobian coefficient at (ux,uy)
      * @param p                         The x coordinate of point (ux,uy) mapped into the image (undistorted and normalized position)
      * @param q                         The y coordinate of point (ux,uy) mapped into the image (undistorted and normalized position)
     */
diff --git a/modules/calib3d/test/test_cameracalibration_artificial.cpp b/modules/calib3d/test/test_cameracalibration_artificial.cpp
index a8351b6b66..de4f2bfccb 100644
--- a/modules/calib3d/test/test_cameracalibration_artificial.cpp
+++ b/modules/calib3d/test/test_cameracalibration_artificial.cpp
@@ -145,7 +145,7 @@ protected:
 
         if (fail)
         {
-            // commented according to vp123's recomendation. TODO - improve accuaracy
+            // commented according to vp123's recommendation. TODO - improve accuracy
             //ts->set_failed_test_info(cvtest::TS::FAIL_BAD_ACCURACY); ss
         }
         ts->printf( cvtest::TS::LOG, "%d) DistCoeff exp=(%.2f, %.2f, %.4f, %.4f %.2f)\n", r, k1, k2, p1, p2, k3);
diff --git a/modules/core/include/opencv2/core.hpp b/modules/core/include/opencv2/core.hpp
index 1cdb470b58..73875012d2 100644
--- a/modules/core/include/opencv2/core.hpp
+++ b/modules/core/include/opencv2/core.hpp
@@ -291,9 +291,9 @@ if src was not a ROI, use borderType | #BORDER_ISOLATED.
 @param src Source image.
 @param dst Destination image of the same type as src and the size Size(src.cols+left+right,
 src.rows+top+bottom) .
-@param top
-@param bottom
-@param left
+@param top the top pixels
+@param bottom the bottom pixels
+@param left the left pixels
 @param right Parameter specifying how many pixels in each direction from the source image rectangle
 to extrapolate. For example, top=1, bottom=1, left=1, right=1 mean that 1 pixel-wide border needs
 to be built.
diff --git a/modules/core/include/opencv2/core/core_c.h b/modules/core/include/opencv2/core/core_c.h
index 0d07d9e792..3937c49112 100644
--- a/modules/core/include/opencv2/core/core_c.h
+++ b/modules/core/include/opencv2/core/core_c.h
@@ -579,7 +579,7 @@ CvNArrayIterator;
 #define CV_NO_CN_CHECK        2
 #define CV_NO_SIZE_CHECK      4
 
-/** initializes iterator that traverses through several arrays simulteneously
+/** initializes iterator that traverses through several arrays simultaneously
    (the function together with cvNextArraySlice is used for
     N-ari element-wise operations) */
 CVAPI(int) cvInitNArrayIterator( int count, CvArr** arrs,
diff --git a/modules/core/include/opencv2/core/cvdef.h b/modules/core/include/opencv2/core/cvdef.h
index 0b301623b0..ae5b096afb 100644
--- a/modules/core/include/opencv2/core/cvdef.h
+++ b/modules/core/include/opencv2/core/cvdef.h
@@ -357,10 +357,10 @@ Cv64suf;
 #  define OPENCV_DISABLE_DEPRECATED_COMPATIBILITY
 #endif
 
-#ifdef CVAPI_EXPORTS
-# if (defined _WIN32 || defined WINCE || defined __CYGWIN__)
+#ifndef CV_EXPORTS
+# if (defined _WIN32 || defined WINCE || defined __CYGWIN__) && defined(CVAPI_EXPORTS)
 #   define CV_EXPORTS __declspec(dllexport)
-# elif defined __GNUC__ && __GNUC__ >= 4
+# elif defined __GNUC__ && __GNUC__ >= 4 && (defined(CVAPI_EXPORTS) || defined(__APPLE__))
 #   define CV_EXPORTS __attribute__ ((visibility ("default")))
 # endif
 #endif
diff --git a/modules/core/include/opencv2/core/operations.hpp b/modules/core/include/opencv2/core/operations.hpp
index 0e0db4072f..64f71569c5 100644
--- a/modules/core/include/opencv2/core/operations.hpp
+++ b/modules/core/include/opencv2/core/operations.hpp
@@ -398,7 +398,7 @@ inline unsigned RNG::next()
     return (unsigned)state;
 }
 
-//! returns the next unifomly-distributed random number of the specified type
+//! returns the next uniformly-distributed random number of the specified type
 template<typename _Tp> static inline _Tp randu()
 {
   return (_Tp)theRNG();
diff --git a/modules/core/include/opencv2/core/optim.hpp b/modules/core/include/opencv2/core/optim.hpp
index 36c798a5fa..70e037f89e 100644
--- a/modules/core/include/opencv2/core/optim.hpp
+++ b/modules/core/include/opencv2/core/optim.hpp
@@ -219,10 +219,10 @@ converge to it. Another obvious restriction is that it should be possible to com
 a function at any point, thus it is preferable to have analytic expression for gradient and
 computational burden should be born by the user.
 
-The latter responsibility is accompilished via the getGradient method of a
+The latter responsibility is accomplished via the getGradient method of a
 MinProblemSolver::Function interface (which represents function being optimized). This method takes
 point a point in *n*-dimensional space (first argument represents the array of coordinates of that
-point) and comput its gradient (it should be stored in the second argument as an array).
+point) and compute its gradient (it should be stored in the second argument as an array).
 
 @note class ConjGradSolver thus does not add any new methods to the basic MinProblemSolver interface.
 
diff --git a/modules/core/src/datastructs.cpp b/modules/core/src/datastructs.cpp
index e90879189d..7a1a3c01ed 100644
--- a/modules/core/src/datastructs.cpp
+++ b/modules/core/src/datastructs.cpp
@@ -3368,7 +3368,7 @@ cvTreeToNodeSeq( const void* first, int header_size, CvMemStorage* storage )
 
 typedef struct CvTreeNode
 {
-    int       flags;         /* micsellaneous flags */
+    int       flags;         /* miscellaneous flags */
     int       header_size;   /* size of sequence header */
     struct    CvTreeNode* h_prev; /* previous sequence */
     struct    CvTreeNode* h_next; /* next sequence */
diff --git a/modules/core/src/mathfuncs_core.simd.hpp b/modules/core/src/mathfuncs_core.simd.hpp
index 881d4b6b92..2959822d7f 100644
--- a/modules/core/src/mathfuncs_core.simd.hpp
+++ b/modules/core/src/mathfuncs_core.simd.hpp
@@ -422,7 +422,7 @@ void log64f(const double *src, double *dst, int n)
 
 #define EXPPOLY_32F_A0 .9670371139572337719125840413672004409288e-2
 
-// the code below uses _mm_cast* intrinsics, which are not avialable on VS2005
+// the code below uses _mm_cast* intrinsics, which are not available on VS2005
 #if (defined _MSC_VER && _MSC_VER < 1500) || \
 (!defined __APPLE__ && defined __GNUC__ && __GNUC__*100 + __GNUC_MINOR__ < 402)
 #undef CV_SSE2
diff --git a/modules/features2d/include/opencv2/features2d.hpp b/modules/features2d/include/opencv2/features2d.hpp
index c995fbf01a..c18f80fea8 100644
--- a/modules/features2d/include/opencv2/features2d.hpp
+++ b/modules/features2d/include/opencv2/features2d.hpp
@@ -341,7 +341,7 @@ public:
     but it is a little faster to compute.
     @param patchSize size of the patch used by the oriented BRIEF descriptor. Of course, on smaller
     pyramid layers the perceived image area covered by a feature will be larger.
-    @param fastThreshold
+    @param fastThreshold the fast threshold
      */
     CV_WRAP static Ptr<ORB> create(int nfeatures=500, float scaleFactor=1.2f, int nlevels=8, int edgeThreshold=31,
         int firstLevel=0, int WTA_K=2, ORB::ScoreType scoreType=ORB::HARRIS_SCORE, int patchSize=31, int fastThreshold=20);
diff --git a/modules/features2d/misc/java/gen_dict.json b/modules/features2d/misc/java/gen_dict.json
index 299749ac85..950fc8a7a1 100644
--- a/modules/features2d/misc/java/gen_dict.json
+++ b/modules/features2d/misc/java/gen_dict.json
@@ -1,7 +1,4 @@
 {
-    "class_ignore_list" : [
-        "SimpleBlobDetector"
-    ],
     "type_dict" : {
         "Feature2D": {
             "j_type": "Feature2D",
diff --git a/modules/features2d/misc/java/test/SIMPLEBLOBFeatureDetectorTest.java b/modules/features2d/misc/java/test/SIMPLEBLOBFeatureDetectorTest.java
index 4485fcdbc8..1d8517bbd4 100644
--- a/modules/features2d/misc/java/test/SIMPLEBLOBFeatureDetectorTest.java
+++ b/modules/features2d/misc/java/test/SIMPLEBLOBFeatureDetectorTest.java
@@ -1,11 +1,62 @@
 package org.opencv.test.features2d;
 
+import java.util.Arrays;
+
+import org.opencv.core.CvType;
+import org.opencv.core.Mat;
+import org.opencv.core.MatOfKeyPoint;
+import org.opencv.core.Point;
+import org.opencv.core.Scalar;
+import org.opencv.core.KeyPoint;
 import org.opencv.test.OpenCVTestCase;
+import org.opencv.test.OpenCVTestRunner;
+import org.opencv.imgproc.Imgproc;
+import org.opencv.features2d.Feature2D;
+import org.opencv.features2d.SimpleBlobDetector;
 
 public class SIMPLEBLOBFeatureDetectorTest extends OpenCVTestCase {
 
+    Feature2D detector;
+    int matSize;
+    KeyPoint[] truth;
+
+    private Mat getMaskImg() {
+        Mat mask = new Mat(matSize, matSize, CvType.CV_8U, new Scalar(255));
+        Mat right = mask.submat(0, matSize, matSize / 2, matSize);
+        right.setTo(new Scalar(0));
+        return mask;
+    }
+
+    private Mat getTestImg() {
+
+        int center = matSize / 2;
+        int offset = 40;
+
+        Mat img = new Mat(matSize, matSize, CvType.CV_8U, new Scalar(255));
+        Imgproc.circle(img, new Point(center - offset, center), 24, new Scalar(0), -1);
+        Imgproc.circle(img, new Point(center + offset, center), 20, new Scalar(50), -1);
+        Imgproc.circle(img, new Point(center, center - offset), 18, new Scalar(100), -1);
+        Imgproc.circle(img, new Point(center, center + offset), 14, new Scalar(150), -1);
+        Imgproc.circle(img, new Point(center, center), 10, new Scalar(200), -1);
+        return img;
+    }
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        detector = SimpleBlobDetector.create();
+        matSize = 200;
+        truth = new KeyPoint[] {
+                new KeyPoint( 140, 100, 41.036568f, -1, 0, 0, -1),
+                new KeyPoint( 60, 100, 48.538486f, -1, 0, 0, -1),
+                new KeyPoint(100, 60, 36.769554f, -1, 0, 0, -1),
+                new KeyPoint(100, 140, 28.635643f, -1, 0, 0, -1),
+                new KeyPoint(100, 100, 20.880613f, -1, 0, 0, -1)
+            };
+    }
+
     public void testCreate() {
-        fail("Not yet implemented");
+        assertNotNull(detector);
     }
 
     public void testDetectListOfMatListOfListOfKeyPoint() {
@@ -17,23 +68,51 @@ public class SIMPLEBLOBFeatureDetectorTest extends OpenCVTestCase {
     }
 
     public void testDetectMatListOfKeyPoint() {
-        fail("Not yet implemented");
+        Mat img = getTestImg();
+        MatOfKeyPoint keypoints = new MatOfKeyPoint();
+
+        detector.detect(img, keypoints);
+
+        assertListKeyPointEquals(Arrays.asList(truth), keypoints.toList(), EPS);
     }
 
     public void testDetectMatListOfKeyPointMat() {
-        fail("Not yet implemented");
+        Mat img = getTestImg();
+        Mat mask = getMaskImg();
+        MatOfKeyPoint keypoints = new MatOfKeyPoint();
+
+        detector.detect(img, keypoints, mask);
+
+        assertListKeyPointEquals(Arrays.asList(truth[1]), keypoints.toList(), EPS);
     }
 
     public void testEmpty() {
+//        assertFalse(detector.empty());
         fail("Not yet implemented");
     }
 
     public void testRead() {
-        fail("Not yet implemented");
+        Mat img = getTestImg();
+
+        MatOfKeyPoint keypoints1 = new MatOfKeyPoint();
+        detector.detect(img, keypoints1);
+
+        String filename = OpenCVTestRunner.getTempFileName("yml");
+        writeFile(filename, "%YAML:1.0\nthresholdStep: 10\nminThreshold: 50\nmaxThreshold: 220\nminRepeatability: 2\nfilterByArea: true\nminArea: 800\nmaxArea: 5000\n");
+        detector.read(filename);
+
+        MatOfKeyPoint keypoints2 = new MatOfKeyPoint();
+        detector.detect(img, keypoints2);
+
+        assertTrue(keypoints2.total() <= keypoints1.total());
     }
 
     public void testWrite() {
-        fail("Not yet implemented");
-    }
+        String filename = OpenCVTestRunner.getTempFileName("xml");
 
+        detector.write(filename);
+
+        String truth = "<?xml version=\"1.0\"?>\n<opencv_storage>\n<format>3</format>\n<thresholdStep>10.</thresholdStep>\n<minThreshold>50.</minThreshold>\n<maxThreshold>220.</maxThreshold>\n<minRepeatability>2</minRepeatability>\n<minDistBetweenBlobs>10.</minDistBetweenBlobs>\n<filterByColor>1</filterByColor>\n<blobColor>0</blobColor>\n<filterByArea>1</filterByArea>\n<minArea>25.</minArea>\n<maxArea>5000.</maxArea>\n<filterByCircularity>0</filterByCircularity>\n<minCircularity>8.0000001192092896e-01</minCircularity>\n<maxCircularity>3.4028234663852886e+38</maxCircularity>\n<filterByInertia>1</filterByInertia>\n<minInertiaRatio>1.0000000149011612e-01</minInertiaRatio>\n<maxInertiaRatio>3.4028234663852886e+38</maxInertiaRatio>\n<filterByConvexity>1</filterByConvexity>\n<minConvexity>9.4999998807907104e-01</minConvexity>\n<maxConvexity>3.4028234663852886e+38</maxConvexity>\n</opencv_storage>\n";
+        assertEquals(truth, readFile(filename));
+    }
 }
diff --git a/modules/imgcodecs/src/exif.cpp b/modules/imgcodecs/src/exif.cpp
index 4dbaf43e81..a556dd0e3c 100644
--- a/modules/imgcodecs/src/exif.cpp
+++ b/modules/imgcodecs/src/exif.cpp
@@ -215,7 +215,7 @@ size_t ExifReader::getFieldSize ()
  * @brief Filling m_exif member with exif directory elements
  *          This is internal function and is not exposed to client
  *
- *  @return The function doesn't return any value. In case of unsiccessful parsing
+ *  @return The function doesn't return any value. In case of unsuccessful parsing
  *      the m_exif member is not filled up
  */
 void ExifReader::parseExif()
diff --git a/modules/imgcodecs/src/rgbe.cpp b/modules/imgcodecs/src/rgbe.cpp
index 5152795d19..7942fcd903 100644
--- a/modules/imgcodecs/src/rgbe.cpp
+++ b/modules/imgcodecs/src/rgbe.cpp
@@ -51,7 +51,7 @@
 // developed by Greg Ward.  It handles the conversions between rgbe and
 // pixels consisting of floats.  The data is assumed to be an array of floats.
 // By default there are three floats per pixel in the order red, green, blue.
-// (RGBE_DATA_??? values control this.)  Only the mimimal header reading and
+// (RGBE_DATA_??? values control this.)  Only the minimal header reading and
 // writing is implemented.  Each routine does error checking and will return
 // a status value as defined below.  This code is intended as a skeleton so
 // feel free to modify it to suit your needs.
diff --git a/modules/java/generator/gen_java.py b/modules/java/generator/gen_java.py
index 57032dbe84..dc47e6f62e 100755
--- a/modules/java/generator/gen_java.py
+++ b/modules/java/generator/gen_java.py
@@ -3,6 +3,7 @@
 import sys, re, os.path, errno, fnmatch
 import json
 import logging
+import codecs
 from shutil import copyfile
 from pprint import pformat
 from string import Template
@@ -10,7 +11,12 @@ from string import Template
 if sys.version_info[0] >= 3:
     from io import StringIO
 else:
-    from cStringIO import StringIO
+    import io
+    class StringIO(io.StringIO):
+        def write(self, s):
+            if isinstance(s, str):
+                s = unicode(s)  # noqa: F821
+            return super(StringIO, self).write(s)
 
 SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
 
@@ -114,14 +120,19 @@ class GeneralInfo():
         self.params={}
         self.annotation=[]
         if type == "class":
-            docstring="// C++: class " + self.name + "\n//javadoc: " + self.name
+            docstring="// C++: class " + self.name + "\n"
         else:
             docstring=""
+
         if len(decl)>5 and decl[5]:
-            #logging.info('docstring: %s', decl[5])
-            if re.search("(@|\\\\)deprecated", decl[5]):
+            doc = decl[5]
+
+            #logging.info('docstring: %s', doc)
+            if re.search("(@|\\\\)deprecated", doc):
                 self.annotation.append("@Deprecated")
 
+            docstring += sanitize_java_documentation_string(doc, type)
+
         self.docstring = docstring
 
     def parseName(self, name, namespaces):
@@ -272,7 +283,7 @@ class ClassInfo(GeneralInfo):
     def initCodeStreams(self, Module):
         self.j_code = StringIO()
         self.jn_code = StringIO()
-        self.cpp_code = StringIO();
+        self.cpp_code = StringIO()
         if self.base:
             self.j_code.write(T_JAVA_START_INHERITED)
         else:
@@ -302,7 +313,7 @@ class ClassInfo(GeneralInfo):
                             jname = self.jname,
                             imports = "\n".join(self.getAllImports(M)),
                             docs = self.docstring,
-                            annotation = "\n".join(self.annotation),
+                            annotation = "\n" + "\n".join(self.annotation) if self.annotation else "",
                             base = self.base)
 
     def generateCppCode(self):
@@ -490,7 +501,7 @@ class JavaWrapperGenerator(object):
                 content = f.read()
                 if content == buf:
                     return
-        with open(path, "wt") as f:
+        with codecs.open(path, "w", "utf-8") as f:
             f.write(buf)
         updated_files += 1
 
@@ -504,7 +515,7 @@ class JavaWrapperGenerator(object):
         self.add_class( ['class ' + self.Module, '', [], []] ) # [ 'class/struct cname', ':bases', [modlist] [props] ]
 
         # scan the headers and build more descriptive maps of classes, consts, functions
-        includes = [];
+        includes = []
         for hdr in common_headers:
             logging.info("\n===== Common header : %s =====", hdr)
             includes.append('#include "' + hdr + '"')
@@ -723,7 +734,7 @@ class JavaWrapperGenerator(object):
                 fi.jname + "(" + ", ".join(j_args) + ")"
             logging.info("java: " + j_signature)
 
-            if(j_signature in j_signatures):
+            if j_signature in j_signatures:
                 if args:
                     args.pop()
                     continue
@@ -739,20 +750,51 @@ class JavaWrapperGenerator(object):
                 type = type_dict[fi.ctype].get("jn_type", "double[]"),
                 name = fi.jname + '_' + str(suffix_counter),
                 args = ", ".join(["%s %s" % (type_dict[a.ctype]["jn_type"], normalize_field_name(a.name)) for a in jn_args])
-            ) );
+            ) )
 
             # java part:
 
             #java doc comment
-            f_name = fi.jname
-            if fi.classname:
-                f_name = fi.classname + "::" + fi.jname
-            java_doc = "//javadoc: " + f_name + "(%s)" % ", ".join([a.name for a in args if a.ctype])
-            j_code.write(" "*4 + java_doc + "\n")
-
             if fi.docstring:
-                lines = StringIO(fi.docstring)
-                for line in lines:
+                lines = fi.docstring.splitlines()
+                returnTag = False
+                javadocParams = []
+                toWrite = []
+                inCode = False
+                for index, line in enumerate(lines):
+                    p0 = line.find("@param")
+                    if p0 != -1:
+                        p0 += 7
+                        p1 = line.find(' ', p0)
+                        p1 = len(line) if p1 == -1 else p1
+                        name = line[p0:p1]
+                        javadocParams.append(name)
+                        for arg in j_args:
+                            if arg.endswith(" " + name):
+                                toWrite.append(line);
+                                break
+                    else:
+                        if "<code>" in line:
+                            inCode = True
+                        if "</code>" in line:
+                            inCode = False
+                        if "@return " in line:
+                            returnTag = True
+
+                        if (not inCode and toWrite and not toWrite[-1] and
+                                line and not line.startswith("\\") and not line.startswith("<ul>") and not line.startswith("@param")):
+                                toWrite.append("<p>");
+
+                        if index == len(lines) - 1:
+                            for arg in j_args:
+                                name = arg[arg.rfind(' ') + 1:]
+                                if not name in javadocParams:
+                                    toWrite.append(" * @param " + name + " automatically generated");
+                            if type_dict[fi.ctype]["j_type"] and not returnTag and fi.ctype != "void":
+                                toWrite.append(" * @return automatically generated");
+                        toWrite.append(line);
+
+                for line in toWrite:
                     j_code.write(" "*4 + line + "\n")
             if fi.annotation:
                 j_code.write(" "*4 + "\n".join(fi.annotation) + "\n")
@@ -779,7 +821,7 @@ class JavaWrapperGenerator(object):
                         j_epilogue.append('Converters.Mat_to_' + ret_type + '(retValMat, retVal);')
                         ret = "return retVal;"
             elif ret_type.startswith("Ptr_"):
-                constructor = type_dict[ret_type]["j_type"] + ".__fromPtr__(";
+                constructor = type_dict[ret_type]["j_type"] + ".__fromPtr__("
                 if j_epilogue:
                     ret_val = type_dict[fi.ctype]["j_type"] + " retVal = " + constructor
                 else:
@@ -796,14 +838,14 @@ class JavaWrapperGenerator(object):
                     ret_val = "nativeObj = "
                 ret = ""
             elif self.isWrapped(ret_type): # wrapped class
-                constructor = self.getClass(ret_type).jname + "(";
+                constructor = self.getClass(ret_type).jname + "("
                 if j_epilogue:
                     ret_val = type_dict[ret_type]["j_type"] + " retVal = new " + constructor
                 else:
                     ret_val = "return new " + constructor
                 tail = ")"
             elif "jn_type" not in type_dict[ret_type]:
-                constructor = type_dict[ret_type]["j_type"] + "(";
+                constructor = type_dict[ret_type]["j_type"] + "("
                 if j_epilogue:
                     ret_val = type_dict[fi.ctype]["j_type"] + " retVal = new " + constructor
                 else:
@@ -815,7 +857,7 @@ class JavaWrapperGenerator(object):
                 static = fi.static
 
             j_code.write( Template(
-"""    public $static$j_type $j_name($j_args) {$prologue
+"""    public $static$j_type$j_name($j_args) {$prologue
         $ret_val$jn_name($jn_args_call)$tail;$epilogue$ret
     }
 
@@ -827,7 +869,7 @@ class JavaWrapperGenerator(object):
                     prologue = "\n        " + "\n        ".join(j_prologue) if j_prologue else "",
                     epilogue = "\n        " + "\n        ".join(j_epilogue) if j_epilogue else "",
                     static = static + " " if static else "",
-                    j_type=type_dict[fi.ctype]["j_type"],
+                    j_type=type_dict[fi.ctype]["j_type"] + " " if type_dict[fi.ctype]["j_type"] else "",
                     j_name=fi.jname,
                     j_args=", ".join(j_args),
                     jn_name=fi.jname + '_' + str(suffix_counter),
@@ -1140,6 +1182,122 @@ def copy_java_files(java_files_dir, java_base_path, default_package_path='org/op
             copyfile(src, dest)
             updated_files += 1
 
+def sanitize_java_documentation_string(doc, type):
+    if type == "class":
+        doc = doc.replace("@param ", "")
+
+    doc = re.sub(re.compile('\\\\f\\$(.*?)\\\\f\\$', re.DOTALL), '\\(' + r'\1' + '\\)', doc)
+    doc = re.sub(re.compile('\\\\f\\[(.*?)\\\\f\\]', re.DOTALL), '\\(' + r'\1' + '\\)', doc)
+    doc = re.sub(re.compile('\\\\f\\{(.*?)\\\\f\\}', re.DOTALL), '\\(' + r'\1' + '\\)', doc)
+
+    doc = doc.replace("&", "&amp;") \
+        .replace("\\<", "&lt;") \
+        .replace("\\>", "&gt;") \
+        .replace("<", "&lt;") \
+        .replace(">", "&gt;") \
+        .replace("$", "$$") \
+        .replace("@anchor", "") \
+        .replace("@brief ", "").replace("\\brief ", "") \
+        .replace("@cite", "CITE:") \
+        .replace("@code{.cpp}", "<code>") \
+        .replace("@code{.txt}", "<code>") \
+        .replace("@code", "<code>") \
+        .replace("@copydoc", "") \
+        .replace("@copybrief", "") \
+        .replace("@date", "") \
+        .replace("@defgroup", "") \
+        .replace("@details ", "") \
+        .replace("@endcode", "</code>") \
+        .replace("@endinternal", "") \
+        .replace("@file", "") \
+        .replace("@include", "INCLUDE:") \
+        .replace("@ingroup", "") \
+        .replace("@internal", "") \
+        .replace("@overload", "") \
+        .replace("@param[in]", "@param") \
+        .replace("@param[out]", "@param") \
+        .replace("@ref", "REF:") \
+        .replace("@returns", "@return") \
+        .replace("@sa", "SEE:") \
+        .replace("@see", "SEE:") \
+        .replace("@snippet", "SNIPPET:") \
+        .replace("@todo", "TODO:") \
+        .replace("@warning ", "WARNING: ")
+
+    doc = re.sub(re.compile('\\*\\*([^\\*]+?)\\*\\*', re.DOTALL), '<b>' + r'\1' + '</b>', doc)
+
+    lines = doc.splitlines()
+
+    lines = list(map(lambda x: x[x.find('*'):].strip() if x.lstrip().startswith("*") else x, lines))
+
+    listInd = [];
+    indexDiff = 0;
+    for index, line in enumerate(lines[:]):
+        if line.strip().startswith("-"):
+            i = line.find("-")
+            if not listInd or i > listInd[-1]:
+                lines.insert(index + indexDiff, "  "*len(listInd) + "<ul>")
+                indexDiff += 1
+                listInd.append(i);
+                lines.insert(index + indexDiff, "  "*len(listInd) + "<li>")
+                indexDiff += 1
+            elif i == listInd[-1]:
+                lines.insert(index + indexDiff, "  "*len(listInd) + "</li>")
+                indexDiff += 1
+                lines.insert(index + indexDiff, "  "*len(listInd) + "<li>")
+                indexDiff += 1
+            elif len(listInd) > 1 and i == listInd[-2]:
+                lines.insert(index + indexDiff, "  "*len(listInd) + "</li>")
+                indexDiff += 1
+                del listInd[-1]
+                lines.insert(index + indexDiff, "  "*len(listInd) + "</ul>")
+                indexDiff += 1
+                lines.insert(index + indexDiff, "  "*len(listInd) + "<li>")
+                indexDiff += 1
+            else:
+                lines.insert(index + indexDiff, "  "*len(listInd) + "</li>")
+                indexDiff += 1
+                del listInd[-1]
+                lines.insert(index + indexDiff, "  "*len(listInd) + "</ul>")
+                indexDiff += 1
+                lines.insert(index + indexDiff, "  "*len(listInd) + "<ul>")
+                indexDiff += 1
+                listInd.append(i);
+                lines.insert(index + indexDiff, "  "*len(listInd) + "<li>")
+                indexDiff += 1
+            lines[index + indexDiff] = lines[index + indexDiff][0:i] + lines[index + indexDiff][i + 1:]
+        else:
+            if listInd and (not line or line == "*" or line.startswith("@note")):
+                lines.insert(index + indexDiff, "  "*len(listInd) + "</li>")
+                indexDiff += 1
+                del listInd[-1]
+                lines.insert(index + indexDiff, "  "*len(listInd) + "</ul>")
+                indexDiff += 1
+
+    i = len(listInd) - 1
+    for value in enumerate(listInd):
+        lines.append("  "*i + "  </li>")
+        lines.append("  "*i + "</ul>")
+        i -= 1;
+
+    lines = list(map(lambda x: "* " + x[1:].strip() if x.startswith("*") and x != "*" else x, lines))
+    lines = list(map(lambda x: x if x.startswith("*") else "* " + x if x and x != "*" else "*", lines))
+
+    lines = list(map(lambda x: x
+        .replace("@note", "<b>Note:</b>")
+    , lines))
+
+    lines = list(map(lambda x: re.sub('@b ([\\w:]+?)\\b', '<b>' + r'\1' + '</b>', x), lines))
+    lines = list(map(lambda x: re.sub('@c ([\\w:]+?)\\b', '<tt>' + r'\1' + '</tt>', x), lines))
+    lines = list(map(lambda x: re.sub('`(.*?)`', "{@code " + r'\1' + '}', x), lines))
+    lines = list(map(lambda x: re.sub('@p ([\\w:]+?)\\b', '{@code ' + r'\1' + '}', x), lines))
+
+    hasValues = False
+    for line in lines:
+        if line != "*":
+            hasValues = True
+            break
+    return "/**\n " + "\n ".join(lines) + "\n */" if hasValues else ""
 
 if __name__ == "__main__":
     # initialize logger
diff --git a/modules/java/generator/templates/java_class.prolog b/modules/java/generator/templates/java_class.prolog
index 49404cb440..5662534bc5 100644
--- a/modules/java/generator/templates/java_class.prolog
+++ b/modules/java/generator/templates/java_class.prolog
@@ -5,8 +5,7 @@ package org.opencv.$module;
 
 $imports
 
-$docs
-$annotation
+$docs$annotation
 public class $jname {
 
     protected final long nativeObj;
diff --git a/modules/java/generator/templates/java_class_inherited.prolog b/modules/java/generator/templates/java_class_inherited.prolog
index 17d5528a73..5865afa1ad 100644
--- a/modules/java/generator/templates/java_class_inherited.prolog
+++ b/modules/java/generator/templates/java_class_inherited.prolog
@@ -5,8 +5,7 @@ package org.opencv.$module;
 
 $imports
 
-$docs
-$annotation
+$docs$annotation
 public class $jname extends $base {
 
     protected $jname(long addr) { super(addr); }
diff --git a/modules/java/generator/templates/java_module.prolog b/modules/java/generator/templates/java_module.prolog
index 41c453bd8c..5ff6a83fd1 100644
--- a/modules/java/generator/templates/java_module.prolog
+++ b/modules/java/generator/templates/java_module.prolog
@@ -5,6 +5,5 @@ package org.opencv.$module;
 
 $imports
 
-$docs
-$annotation
+$docs$annotation
 public class $jname {
diff --git a/modules/java/jar/CMakeLists.txt b/modules/java/jar/CMakeLists.txt
index 0e16e3b5eb..2cce25a76b 100644
--- a/modules/java/jar/CMakeLists.txt
+++ b/modules/java/jar/CMakeLists.txt
@@ -25,6 +25,8 @@ if(OPENCV_JAVA_TARGET_VERSION)
   set(OPENCV_ANT_JAVAC_EXTRA_ATTRS "${OPENCV_ANT_JAVAC_EXTRA_ATTRS} target=\"${OPENCV_JAVA_TARGET_VERSION}\"")
 endif()
 
+set(OPENCV_JAVADOC_DESTINATION "${OpenCV_BINARY_DIR}/doc/doxygen/html/javadoc" CACHE STRING "")
+
 configure_file("${CMAKE_CURRENT_SOURCE_DIR}/build.xml.in" "${OPENCV_JAVA_DIR}/build.xml" @ONLY)
 list(APPEND depends "${OPENCV_JAVA_DIR}/build.xml")
 
diff --git a/modules/java/jar/build.xml.in b/modules/java/jar/build.xml.in
index 41b55b76fc..bf2830186e 100644
--- a/modules/java/jar/build.xml.in
+++ b/modules/java/jar/build.xml.in
@@ -29,14 +29,35 @@
   </target>
 
   <target name="javadoc">
+    <copy file="@OpenCV_SOURCE_DIR@/doc/mymath.js"
+      todir="@OPENCV_JAVADOC_DESTINATION@" />
+
+    <!-- synchronize with platforms\android\build_sdk.py -->
     <javadoc
       packagenames="org.opencv.*"
       sourcepath="java"
-      destdir="@OpenCV_BINARY_DIR@/doc/doxygen/html/javadoc"
+      destdir="@OPENCV_JAVADOC_DESTINATION@"
       Windowtitle="OpenCV @OPENCV_VERSION_PLAIN@ Java documentation"
       Doctitle="OpenCV Java documentation (@OPENCV_VERSION@)"
       bottom="Generated on ${timestamp} / OpenCV @OPENCV_VCSVERSION@"
-      />
+      failonerror="true"
+      encoding="UTF-8" charset="UTF-8" docencoding="UTF-8"
+      link="https://docs.oracle.com/javase/6/docs/api/"
+      additionalparam="--allow-script-in-comments"
+      >
+      <Header>
+         <![CDATA[
+            <script>
+              var url = window.location.href;
+              var pos = url.lastIndexOf('/javadoc/');
+              url = pos >= 0 ? (url.substring(0, pos) + '/javadoc/mymath.js') : (window.location.origin + '/mymath.js');
+              var script = document.createElement('script');
+              script.src = '@OPENCV_MATHJAX_RELPATH@/MathJax.js?config=TeX-AMS-MML_HTMLorMML,' + url;
+              document.getElementsByTagName('head')[0].appendChild(script);
+            </script>
+         ]]>
+      </Header>
+    </javadoc>
   </target>
 
 </project>
diff --git a/modules/ml/include/opencv2/ml.hpp b/modules/ml/include/opencv2/ml.hpp
index a1d68446ce..68757f3849 100644
--- a/modules/ml/include/opencv2/ml.hpp
+++ b/modules/ml/include/opencv2/ml.hpp
@@ -1004,7 +1004,7 @@ public:
     @param samples Samples from which the Gaussian mixture model will be estimated. It should be a
         one-channel matrix, each row of which is a sample. If the matrix does not have CV_64F type
         it will be converted to the inner matrix of such type for the further computing.
-    @param probs0
+    @param probs0 the probabilities
     @param logLikelihoods The optional output matrix that contains a likelihood logarithm value for
         each sample. It has \f$nsamples \times 1\f$ size and CV_64FC1 type.
     @param labels The optional output "class label" for each sample:
diff --git a/modules/objdetect/misc/java/test/QRCodeDetectorTest.java b/modules/objdetect/misc/java/test/QRCodeDetectorTest.java
index 43cef7e79e..9879772e42 100644
--- a/modules/objdetect/misc/java/test/QRCodeDetectorTest.java
+++ b/modules/objdetect/misc/java/test/QRCodeDetectorTest.java
@@ -3,9 +3,7 @@ package org.opencv.test.objdetect;
 import org.opencv.core.Mat;
 import org.opencv.objdetect.QRCodeDetector;
 import org.opencv.imgcodecs.Imgcodecs;
-import org.opencv.objdetect.Objdetect;
 import org.opencv.test.OpenCVTestCase;
-import org.opencv.test.OpenCVTestRunner;
 
 public class QRCodeDetectorTest extends OpenCVTestCase {
 
diff --git a/modules/objdetect/misc/python/test/test_qrcode_detect.py b/modules/objdetect/misc/python/test/test_qrcode_detect.py
new file mode 100644
index 0000000000..4ffd60ec8f
--- /dev/null
+++ b/modules/objdetect/misc/python/test/test_qrcode_detect.py
@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+'''
+===============================================================================
+QR code detect and decode pipeline.
+===============================================================================
+'''
+
+import numpy as np
+import cv2 as cv
+
+from tests_common import NewOpenCVTests
+
+class qrcode_detector_test(NewOpenCVTests):
+    def test_detect_and_decode(self):
+        img = cv.imread(self.extraTestDataPath + '/cv/qrcode/link_ocv.jpg')
+        detector = cv.QRCodeDetector()
+        retval, points, straight_qrcode = detector.detectAndDecode(img)
+        self.assertEqual(retval, "https://opencv.org/");
diff --git a/modules/objdetect/src/qrcode.cpp b/modules/objdetect/src/qrcode.cpp
index fadff0c02b..bde26d4b55 100644
--- a/modules/objdetect/src/qrcode.cpp
+++ b/modules/objdetect/src/qrcode.cpp
@@ -1068,7 +1068,6 @@ std::string QRCodeDetector::decode(InputArray in, InputArray points,
         inarr = gray;
     }
 
-    CV_Assert(points.isVector());
     vector<Point2f> src_points;
     points.copyTo(src_points);
     CV_Assert(src_points.size() == 4);
diff --git a/modules/photo/src/inpaint.cpp b/modules/photo/src/inpaint.cpp
index 6aac221eee..36ab7bec8c 100644
--- a/modules/photo/src/inpaint.cpp
+++ b/modules/photo/src/inpaint.cpp
@@ -299,7 +299,7 @@ icvTeleaInpaintFMM(const CvMat *f, CvMat *t, CvMat *out, int range, CvPriorityQu
             else if(q==1) {i=ii;   j=jj-1;}
             else if(q==2) {i=ii+1; j=jj;}
             else if(q==3) {i=ii;   j=jj+1;}
-            if ((i<=1)||(j<=1)||(i>t->rows-1)||(j>t->cols-1)) continue;
+            if ((i<=0)||(j<=0)||(i>t->rows-1)||(j>t->cols-1)) continue;
 
             if (CV_MAT_ELEM(*f,uchar,i,j)==INSIDE) {
                dist = min4(FastMarching_solve(i-1,j,i,j-1,f,t),
@@ -411,7 +411,7 @@ icvTeleaInpaintFMM(const CvMat *f, CvMat *t, CvMat *out, int range, CvPriorityQu
             else if(q==1) {i=ii;   j=jj-1;}
             else if(q==2) {i=ii+1; j=jj;}
             else if(q==3) {i=ii;   j=jj+1;}
-            if ((i<=1)||(j<=1)||(i>t->rows-1)||(j>t->cols-1)) continue;
+            if ((i<=0)||(j<=0)||(i>t->rows-1)||(j>t->cols-1)) continue;
 
             if (CV_MAT_ELEM(*f,uchar,i,j)==INSIDE) {
                dist = min4(FastMarching_solve(i-1,j,i,j-1,f,t),
@@ -531,7 +531,7 @@ icvNSInpaintFMM(const CvMat *f, CvMat *t, CvMat *out, int range, CvPriorityQueue
             else if(q==1) {i=ii;   j=jj-1;}
             else if(q==2) {i=ii+1; j=jj;}
             else if(q==3) {i=ii;   j=jj+1;}
-            if ((i<=1)||(j<=1)||(i>t->rows-1)||(j>t->cols-1)) continue;
+            if ((i<=0)||(j<=0)||(i>t->rows-1)||(j>t->cols-1)) continue;
 
             if (CV_MAT_ELEM(*f,uchar,i,j)==INSIDE) {
                dist = min4(FastMarching_solve(i-1,j,i,j-1,f,t),
@@ -619,7 +619,7 @@ icvNSInpaintFMM(const CvMat *f, CvMat *t, CvMat *out, int range, CvPriorityQueue
             else if(q==1) {i=ii;   j=jj-1;}
             else if(q==2) {i=ii+1; j=jj;}
             else if(q==3) {i=ii;   j=jj+1;}
-            if ((i<=1)||(j<=1)||(i>t->rows-1)||(j>t->cols-1)) continue;
+            if ((i<=0)||(j<=0)||(i>t->rows-1)||(j>t->cols-1)) continue;
 
             if (CV_MAT_ELEM(*f,uchar,i,j)==INSIDE) {
                dist = min4(FastMarching_solve(i-1,j,i,j-1,f,t),
diff --git a/modules/photo/test/test_inpaint.cpp b/modules/photo/test/test_inpaint.cpp
index 7288501a8a..58806cbbc2 100644
--- a/modules/photo/test/test_inpaint.cpp
+++ b/modules/photo/test/test_inpaint.cpp
@@ -139,4 +139,22 @@ TEST_P(formats, 1c)
 
 INSTANTIATE_TEST_CASE_P(Photo_Inpaint, formats, testing::Values(CV_32F, CV_16U, CV_8U));
 
+TEST(Photo_InpaintBorders, regression)
+{
+    Mat img(64, 64, CV_8U);
+    img = 128;
+    img(Rect(0, 0, 16, 64)) = 0;
+
+    Mat mask(64, 64, CV_8U);
+    mask = 0;
+    mask(Rect(0, 0, 16, 64)) = 255;
+
+    Mat inpainted;
+    inpaint(img, mask, inpainted, 1, INPAINT_TELEA);
+
+    Mat diff;
+    cv::absdiff(inpainted, 128*Mat::ones(inpainted.size(), inpainted.type()), diff);
+    ASSERT_TRUE(countNonZero(diff) == 0);
+}
+
 }} // namespace
diff --git a/modules/python/common.cmake b/modules/python/common.cmake
index 830e4cbc45..17503c03f9 100644
--- a/modules/python/common.cmake
+++ b/modules/python/common.cmake
@@ -61,7 +61,6 @@ ocv_update(OPENCV_PYTHON_EXTENSION_BUILD_PATH "${LIBRARY_OUTPUT_PATH}/${MODULE_I
 set_target_properties(${the_module} PROPERTIES
                       LIBRARY_OUTPUT_DIRECTORY  "${OPENCV_PYTHON_EXTENSION_BUILD_PATH}"
                       ARCHIVE_OUTPUT_NAME ${the_module}  # prevent name conflict for python2/3 outputs
-                      DEFINE_SYMBOL CVAPI_EXPORTS
                       PREFIX ""
                       OUTPUT_NAME cv2
                       SUFFIX ${CVPY_SUFFIX})
diff --git a/modules/python/src2/cv2.cpp b/modules/python/src2/cv2.cpp
index b3cbff5b42..a00398f84e 100644
--- a/modules/python/src2/cv2.cpp
+++ b/modules/python/src2/cv2.cpp
@@ -1797,8 +1797,12 @@ static int to_ok(PyTypeObject *to)
 }
 
 
+#if defined(__GNUC__)
+#pragma GCC visibility push(default)
+#endif
+
 #if PY_MAJOR_VERSION >= 3
-extern "C" CV_EXPORTS PyObject* PyInit_cv2();
+PyMODINIT_FUNC PyInit_cv2();
 static struct PyModuleDef cv2_moduledef =
 {
     PyModuleDef_HEAD_INIT,
@@ -1811,7 +1815,7 @@ static struct PyModuleDef cv2_moduledef =
 
 PyObject* PyInit_cv2()
 #else
-extern "C" CV_EXPORTS void initcv2();
+PyMODINIT_FUNC initcv2();
 
 void initcv2()
 #endif
diff --git a/modules/python/src2/hdr_parser.py b/modules/python/src2/hdr_parser.py
index 3f8eee4a40..c2b206049b 100755
--- a/modules/python/src2/hdr_parser.py
+++ b/modules/python/src2/hdr_parser.py
@@ -827,7 +827,7 @@ class CppHeaderParser(object):
             if state == DOCSTRING:
                 pos = l.find("*/")
                 if pos < 0:
-                    docstring += l + "\n"
+                    docstring += l0
                     continue
                 docstring += l[:pos] + "\n"
                 l = l[pos+2:]
diff --git a/modules/ts/src/ts_gtest.cpp b/modules/ts/src/ts_gtest.cpp
index 4d9637c804..a65ef721a2 100644
--- a/modules/ts/src/ts_gtest.cpp
+++ b/modules/ts/src/ts_gtest.cpp
@@ -8284,8 +8284,8 @@ DeathTest::TestRole WindowsDeathTest::AssumeRole() {
   GTEST_DEATH_TEST_CHECK_(::CreateProcessA(
       executable_path,
       const_cast<char*>(command_line.c_str()),
-      NULL,   // Retuned process handle is not inheritable.
-      NULL,   // Retuned thread handle is not inheritable.
+      NULL,   // Returned process handle is not inheritable.
+      NULL,   // Returned thread handle is not inheritable.
       TRUE,   // Child inherits all inheritable handles (for write_handle_).
       0x0,    // Default creation flags.
       NULL,   // Inherit the parent's environment.
diff --git a/modules/video/src/ecc.cpp b/modules/video/src/ecc.cpp
index cd189566c7..01a702155d 100644
--- a/modules/video/src/ecc.cpp
+++ b/modules/video/src/ecc.cpp
@@ -550,7 +550,7 @@ double cv::findTransformECC(InputArray templateImage,
 
         const double correlation = templateZM.dot(imageWarped);
 
-        // calculate enhanced correlation coefficiont (ECC)->rho
+        // calculate enhanced correlation coefficient (ECC)->rho
         last_rho = rho;
         rho = correlation/(imgNorm*tmpNorm);
         if (cvIsNaN(rho)) {
diff --git a/modules/video/src/lkpyramid.cpp b/modules/video/src/lkpyramid.cpp
index 27ba56b909..fbcf1b128a 100644
--- a/modules/video/src/lkpyramid.cpp
+++ b/modules/video/src/lkpyramid.cpp
@@ -1281,7 +1281,7 @@ void SparsePyrLKOpticalFlowImpl::calc( InputArray _prevImg, InputArray _nextImg,
             levels1 /= 2;
         }
 
-        // ensure that pyramid has reqired padding
+        // ensure that pyramid has required padding
         if(levels1 > 0)
         {
             Size fullSize;
@@ -1309,7 +1309,7 @@ void SparsePyrLKOpticalFlowImpl::calc( InputArray _prevImg, InputArray _nextImg,
             levels2 /= 2;
         }
 
-        // ensure that pyramid has reqired padding
+        // ensure that pyramid has required padding
         if(levels2 > 0)
         {
             Size fullSize;
diff --git a/modules/videoio/include/opencv2/videoio.hpp b/modules/videoio/include/opencv2/videoio.hpp
index 17431dd91b..5dd10fd268 100644
--- a/modules/videoio/include/opencv2/videoio.hpp
+++ b/modules/videoio/include/opencv2/videoio.hpp
@@ -766,8 +766,8 @@ public:
 
     @note Reading / writing properties involves many layers. Some unexpected result might happens
     along this chain.
-    @code {.txt}
-    `VideoCapture -> API Backend -> Operating System -> Device Driver -> Device Hardware`
+    @code{.txt}
+    VideoCapture -> API Backend -> Operating System -> Device Driver -> Device Hardware
     @endcode
     The returned value might be different from what really used by the device or it could be encoded
     using device dependent rules (eg. steps or percentage). Effective behaviour depends from device
diff --git a/platforms/android/build_sdk.py b/platforms/android/build_sdk.py
index fb7194b303..352d5088de 100755
--- a/platforms/android/build_sdk.py
+++ b/platforms/android/build_sdk.py
@@ -1,6 +1,13 @@
 #!/usr/bin/env python
 
-import os, sys, subprocess, argparse, shutil, glob, re
+import os, sys
+import argparse
+import glob
+import re
+import shutil
+import subprocess
+import time
+
 import logging as log
 import xml.etree.ElementTree as ET
 
@@ -245,14 +252,34 @@ class Builder:
             for f in files:
                 if f == "android.jar" or f == "annotations.jar":
                     classpaths.append(os.path.join(dir, f))
+        srcdir = os.path.join(self.resultdest, 'sdk', 'java', 'src')
+        dstdir = self.docdest
+        # synchronize with modules/java/jar/build.xml.in
+        shutil.copy2(os.path.join(SCRIPT_DIR, '../../doc/mymath.js'), dstdir)
         cmd = [
             "javadoc",
-            "-header", "OpenCV %s" % self.opencv_version,
+            '-windowtitle', 'OpenCV %s Java documentation' % self.opencv_version,
+            '-doctitle', 'OpenCV Java documentation (%s)' % self.opencv_version,
             "-nodeprecated",
-            "-footer", '<a href="http://docs.opencv.org">OpenCV %s Documentation</a>' % self.opencv_version,
             "-public",
-            '-sourcepath', os.path.join(self.resultdest, 'sdk', 'java', 'src'),
-            "-d", self.docdest,
+            '-sourcepath', srcdir,
+            '-encoding', 'UTF-8',
+            '-charset', 'UTF-8',
+            '-docencoding', 'UTF-8',
+            '--allow-script-in-comments',
+            '-header',
+'''
+            <script>
+              var url = window.location.href;
+              var pos = url.lastIndexOf('/javadoc/');
+              url = pos >= 0 ? (url.substring(0, pos) + '/javadoc/mymath.js') : (window.location.origin + '/mymath.js');
+              var script = document.createElement('script');
+              script.src = '%s/MathJax.js?config=TeX-AMS-MML_HTMLorMML,' + url;
+              document.getElementsByTagName('head')[0].appendChild(script);
+            </script>
+''' % 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0',
+            '-bottom', 'Generated on %s / OpenCV %s' % (time.strftime("%Y-%m-%d %H:%M:%S"), self.opencv_version),
+            "-d", dstdir,
             "-classpath", ":".join(classpaths),
             '-subpackages', 'org.opencv',
         ]
diff --git a/samples/cpp/videocapture_gstreamer_pipeline.cpp b/samples/cpp/videocapture_gstreamer_pipeline.cpp
index bc6b6590f0..9507eb3c90 100644
--- a/samples/cpp/videocapture_gstreamer_pipeline.cpp
+++ b/samples/cpp/videocapture_gstreamer_pipeline.cpp
@@ -266,7 +266,10 @@ int main(int argc, char *argv[])
         cout << "Unsupported mode: " << mode << endl;
         return -1;
     }
-    file_name = samples::findFile(file_name);
+    if (mode == "decode")
+    {
+        file_name = samples::findFile(file_name);
+    }
     cout << "Mode: " << mode << ", Backend: " << backend << ", File: " << file_name << ", Codec: " << codec << endl;
 
     TickMeter total;
diff --git a/samples/cpp/videocapture_openni.cpp b/samples/cpp/videocapture_openni.cpp
index 9323626a49..e8a87193e1 100644
--- a/samples/cpp/videocapture_openni.cpp
+++ b/samples/cpp/videocapture_openni.cpp
@@ -177,7 +177,7 @@ int main( int argc, char* argv[] )
     else
         capture.set(CAP_OPENNI_IR_GENERATOR_PRESENT, false);
 
-    // Print some avalible device settings.
+    // Print some available device settings.
     if (capture.get(CAP_OPENNI_DEPTH_GENERATOR_PRESENT))
     {
         cout << "\nDepth generator output mode:" << endl <<
diff --git a/samples/python/tutorial_code/imgProc/BasicGeometricDrawing/basic_geometric_drawing.py b/samples/python/tutorial_code/imgProc/BasicGeometricDrawing/basic_geometric_drawing.py
index ec25d64a45..f80c2f108c 100644
--- a/samples/python/tutorial_code/imgProc/BasicGeometricDrawing/basic_geometric_drawing.py
+++ b/samples/python/tutorial_code/imgProc/BasicGeometricDrawing/basic_geometric_drawing.py
@@ -8,8 +8,8 @@ def my_ellipse(img, angle):
     line_type = 8
 
     cv.ellipse(img,
-                (W / 2, W / 2),
-                (W / 4, W / 16),
+                (W // 2, W // 2),
+                (W // 4, W // 16),
                 angle,
                 0,
                 360,
@@ -24,7 +24,7 @@ def my_filled_circle(img, center):
 
     cv.circle(img,
                center,
-               W / 32,
+               W // 32,
                (0, 0, 255),
                thickness,
                line_type)
@@ -82,7 +82,7 @@ my_ellipse(atom_image, 45)
 my_ellipse(atom_image, -45)
 
 # 1.b. Creating circles
-my_filled_circle(atom_image, (W / 2, W / 2))
+my_filled_circle(atom_image, (W // 2, W // 2))
 ## [draw_atom]
 ## [draw_rook]
 
@@ -93,7 +93,7 @@ my_polygon(rook_image)
 ## [rectangle]
 # 2.b. Creating rectangles
 cv.rectangle(rook_image,
-              (0, 7 * W / 8),
+              (0, 7 * W // 8),
               (W, W),
               (0, 255, 255),
               -1,
@@ -101,10 +101,10 @@ cv.rectangle(rook_image,
 ## [rectangle]
 
 #  2.c. Create a few lines
-my_line(rook_image, (0, 15 * W / 16), (W, 15 * W / 16))
-my_line(rook_image, (W / 4, 7 * W / 8), (W / 4, W))
-my_line(rook_image, (W / 2, 7 * W / 8), (W / 2, W))
-my_line(rook_image, (3 * W / 4, 7 * W / 8), (3 * W / 4, W))
+my_line(rook_image, (0, 15 * W // 16), (W, 15 * W // 16))
+my_line(rook_image, (W // 4, 7 * W // 8), (W // 4, W))
+my_line(rook_image, (W // 2, 7 * W // 8), (W // 2, W))
+my_line(rook_image, (3 * W // 4, 7 * W // 8), (3 * W // 4, W))
 ## [draw_rook]
 cv.imshow(atom_window, atom_image)
 cv.moveWindow(atom_window, 0, 200)
diff --git a/samples/python/tutorial_code/imgProc/morph_lines_detection/morph_lines_detection.py b/samples/python/tutorial_code/imgProc/morph_lines_detection/morph_lines_detection.py
index 4e9c0d4d13..b7c0150319 100644
--- a/samples/python/tutorial_code/imgProc/morph_lines_detection/morph_lines_detection.py
+++ b/samples/python/tutorial_code/imgProc/morph_lines_detection/morph_lines_detection.py
@@ -63,7 +63,7 @@ def main(argv):
     # [horiz]
     # Specify size on horizontal axis
     cols = horizontal.shape[1]
-    horizontal_size = cols / 30
+    horizontal_size = cols // 30
 
     # Create structure element for extracting horizontal lines through morphology operations
     horizontalStructure = cv.getStructuringElement(cv.MORPH_RECT, (horizontal_size, 1))
@@ -79,7 +79,7 @@ def main(argv):
     # [vert]
     # Specify size on vertical axis
     rows = vertical.shape[0]
-    verticalsize = rows / 30
+    verticalsize = rows // 30
 
     # Create structure element for extracting vertical lines through morphology operations
     verticalStructure = cv.getStructuringElement(cv.MORPH_RECT, (1, verticalsize))