Merge pull request #1480 from berak:fix_paillou_sample

modules/ximgproc/samples/paillou_demo.cpp

@@ -48,7 +48,6 @@ using namespace std;
 
 int aa = 100, ww = 10;
 
-Ptr<Mat> img;
 const char* window_name = "Gradient Modulus";
 
 static void DisplayImage(Mat x,string s)
@@ -72,13 +71,14 @@ static void DisplayImage(Mat x,string s)
  * @function paillouFilter
  * @brief Trackbar callback
  */
-static void PaillouFilter(int, void*)
+static void PaillouFilter(int, void*pm)
 {
+    Mat img = *((Mat*)pm);
     Mat dst;
     double a=aa/100.0, w=ww/100.0;
     Mat rx,ry;
-    GradientPaillouX(*img.get(),rx,a,w);
+    GradientPaillouX(img, rx, a, w);
-    GradientPaillouY(*img.get(),ry,a,w);
+    GradientPaillouY(img, ry, a, w);
     DisplayImage(rx, "Gx");
     DisplayImage(ry, "Gy");
     add(rx.mul(rx), ry.mul(ry), dst);
@@ -89,21 +89,24 @@ static void PaillouFilter(int, void*)
 
 int main(int argc, char* argv[])
 {
-	Mat *m=new Mat;
+    if (argc < 2)
-	if (argc == 2)
+    {
-		*m = imread(argv[1]);
+        cout << "usage: paillou_demo [image]" << endl;
-	if (m->empty())
+        return 1;
+    }
+    Mat img = imread(argv[1]);
+    if (img.empty())
     {
         cout << "File not found or empty image\n";
+        return 1;
     }
-	img = Ptr<Mat>(m);
+    imshow("Original",img);
-	imshow("Original",*img.get());
     namedWindow( window_name, WINDOW_AUTOSIZE );
 
     /// Create a Trackbar for user to enter threshold
-    createTrackbar( "a:",window_name, &aa, 400, PaillouFilter );
+    createTrackbar( "a:",window_name, &aa, 400, PaillouFilter, &img );
-    createTrackbar( "w:", window_name, &ww, 400, PaillouFilter );
+    createTrackbar( "w:", window_name, &ww, 400, PaillouFilter, &img );
-    PaillouFilter(0,NULL);
+    PaillouFilter(0, &img);
     waitKey();
     return 0;
 }