Update samples (#10333)

* Update samples

* Update calib3d.hpp

* Update calib3d.hpp

* Update calib3d.hpp

* Update calib3d.hpp

samples/cpp/tutorial_code/photo/decolorization/decolor.cpp

@@ -24,17 +24,21 @@
 using namespace std;
 using namespace cv;
 
-int main(int argc, char *argv[])
+int main( int argc, char *argv[] )
 {
-    CV_Assert(argc == 2);
-    Mat src;
-    src = imread(argv[1], IMREAD_COLOR);
+    CommandLineParser parser( argc, argv, "{@input | ../data/HappyFish.jpg | input image}" );
+    Mat src = imread( parser.get<String>( "@input" ), IMREAD_COLOR );
+    if ( src.empty() )
+    {
+        cout << "Could not open or find the image!\n" << endl;
+        cout << "Usage: " << argv[0] << " <Input image>" << endl;
+        return -1;
+    }
+    Mat gray = Mat( src.size(), CV_8UC1 );
+    Mat color_boost = Mat( src.size(), CV_8UC3 );
 
-    Mat gray = Mat(src.size(),CV_8UC1);
-    Mat color_boost = Mat(src.size(),CV_8UC3);
-
-    decolor(src,gray,color_boost);
-    imshow("grayscale",gray);
-    imshow("color_boost",color_boost);
+    decolor( src, gray, color_boost );
+    imshow( "grayscale", gray );
+    imshow( "color_boost", color_boost );
     waitKey(0);
 }

samples/cpp/tutorial_code/photo/non_photorealistic_rendering/npr_demo.cpp

@@ -14,32 +14,24 @@
 *
 */
 
-#include <signal.h>
 #include "opencv2/photo.hpp"
 #include "opencv2/imgproc.hpp"
 #include "opencv2/highgui.hpp"
-#include "opencv2/core.hpp"
 #include <iostream>
-#include <stdlib.h>
 
 using namespace std;
 using namespace cv;
 
 int main(int argc, char* argv[])
 {
-    if(argc < 2)
-    {
-        cout << "usage: " << argv[0] << " <Input image> "  << endl;
-        exit(0);
-    }
-
     int num,type;
-
-    Mat src = imread(argv[1], IMREAD_COLOR);
+    CommandLineParser parser(argc, argv, "{@input | ../data/lena.jpg | input image}");
+    Mat src = imread(parser.get<String>("@input"), IMREAD_COLOR);
 
     if(src.empty())
     {
-        cout <<  "Image not found" << endl;
+        cout << "Could not open or find the image!\n" << endl;
+        cout << "Usage: " << argv[0] << " <Input image>" << endl;
         exit(0);
     }