diff --git a/modules/contrib/include/opencv2/contrib/detection_based_tracker.hpp b/modules/contrib/include/opencv2/contrib/detection_based_tracker.hpp
index df482bab6d..35aa810320 100644
--- a/modules/contrib/include/opencv2/contrib/detection_based_tracker.hpp
+++ b/modules/contrib/include/opencv2/contrib/detection_based_tracker.hpp
@@ -22,53 +22,53 @@ class DetectionBasedTracker
         {
             public:
                 IDetector():
-                    MinObjSize(96, 96),
-                    MaxObjSize(INT_MAX, INT_MAX),
-                    ScaleFactor(1.1f),
-                    MinNeighbours(2)
+                    minObjSize(96, 96),
+                    maxObjSize(INT_MAX, INT_MAX),
+                    scaleFactor(1.1f),
+                    minNeighbours(2)
                 {}
 
                 virtual void detect(const cv::Mat& Image, std::vector<cv::Rect>& objects) = 0;
 
                 void setMinObjectSize(const cv::Size& min)
                 {
-                    MinObjSize = min;
+                    minObjSize = min;
                 }
                 void setMaxObjectSize(const cv::Size& max)
                 {
-                    MaxObjSize = max;
+                    maxObjSize = max;
                 }
                 cv::Size getMinObjectSize() const
                 {
-                    return MinObjSize;
+                    return minObjSize;
                 }
                 cv::Size getMaxObjectSize() const
                 {
-                    return MaxObjSize;
+                    return maxObjSize;
                 }
                 float getScaleFactor()
                 {
-                    return ScaleFactor;
+                    return scaleFactor;
                 }
                 void setScaleFactor(float value)
                 {
-                    ScaleFactor = value;
+                    scaleFactor = value;
                 }
                 int getMinNeighbours()
                 {
-                    return ScaleFactor;
+                    return minNeighbours;
                 }
                 void setMinNeighbours(int value)
                 {
-
+                    minNeighbours = value;
                 }
                 virtual ~IDetector() {}
 
             protected:
-                cv::Size MinObjSize;
-                cv::Size MaxObjSize;
-                int MinNeighbours;
-                float ScaleFactor;
+                cv::Size minObjSize;
+                cv::Size maxObjSize;
+                int minNeighbours;
+                float scaleFactor;
         };
 
         DetectionBasedTracker(cv::Ptr<IDetector> MainDetector, cv::Ptr<IDetector> TrackingDetector, const Parameters& params);
diff --git a/samples/cpp/dbt_face_detection.cpp b/samples/cpp/dbt_face_detection.cpp
index 53bb7cf25a..4d9eed6e26 100644
--- a/samples/cpp/dbt_face_detection.cpp
+++ b/samples/cpp/dbt_face_detection.cpp
@@ -1,3 +1,5 @@
+#if defined(__linux__) || defined(LINUX) || defined(__APPLE__) || defined(ANDROID)
+
 #include <opencv2/imgproc/imgproc.hpp>  // Gaussian Blur
 #include <opencv2/core/core.hpp>        // Basic OpenCV structures (cv::Mat, Scalar)
 #include <opencv2/highgui/highgui.hpp>  // OpenCV window I/O
@@ -16,6 +18,7 @@ class CascadeDetectorAdapter: public DetectionBasedTracker::IDetector
 {
     public:
         CascadeDetectorAdapter(cv::Ptr<cv::CascadeClassifier> detector):
+            IDetector(),
             Detector(detector)
         {
             CV_Assert(!detector.empty());
@@ -23,7 +26,7 @@ class CascadeDetectorAdapter: public DetectionBasedTracker::IDetector
 
         void detect(const cv::Mat &Image, std::vector<cv::Rect> &objects)
         {
-            Detector->detectMultiScale(Image, objects, ScaleFactor, MinNeighbours, 0, MinObjSize, MaxObjSize);
+            Detector->detectMultiScale(Image, objects, scaleFactor, minNeighbours, 0, minObjSize, maxObjSize);
         }
         virtual ~CascadeDetectorAdapter()
         {}
@@ -87,4 +90,15 @@ int main(int argc, char* argv[])
     return 0;
 }
 
+#else
+
+#include <stdio.h>
+int main()
+{
+    printf("This sample works for UNIX or ANDROID only\n");
+    return 0;
+}
+
+#endif
+
 
diff --git a/samples/cpp/detection_based_tracker_sample.cpp b/samples/cpp/detection_based_tracker_sample.cpp
index 470304790d..e08c319db5 100644
--- a/samples/cpp/detection_based_tracker_sample.cpp
+++ b/samples/cpp/detection_based_tracker_sample.cpp
@@ -65,6 +65,7 @@ class CascadeDetectorAdapter: public DetectionBasedTracker::IDetector
 {
     public:
         CascadeDetectorAdapter(cv::Ptr<cv::CascadeClassifier> detector):
+            IDetector(),
             Detector(detector)
         {
             CV_Assert(!detector.empty());
@@ -72,7 +73,7 @@ class CascadeDetectorAdapter: public DetectionBasedTracker::IDetector
 
         void detect(const cv::Mat &Image, std::vector<cv::Rect> &objects)
         {
-            Detector->detectMultiScale(Image, objects, 1.1, 3, 0, MinObjSize, MaxObjSize);
+            Detector->detectMultiScale(Image, objects, 1.1, 3, 0, minObjSize, maxObjSize);
         }
         virtual ~CascadeDetectorAdapter()
         {}