7 g.wndname = "Distance transform";
8 g.tbarname = "Threshold";
20 ## define a trackbar callback
21 function on_trackbar( edge_thresh )
25 cvThreshold( g.gray, g.edge, double(edge_thresh), double(edge_thresh), cv.CV_THRESH_BINARY );
27 cvDistTransform( g.edge, g.dist, cv.CV_DIST_L2, cv.CV_DIST_MASK_5, [], [] );
29 cvConvertScale( g.dist, g.dist, 5000.0, 0 );
30 cvPow( g.dist, g.dist, 0.5 );
32 cvConvertScale( g.dist, g.dist32s, 1.0, 0.5 );
33 cvAndS( g.dist32s, cvScalarAll(255), g.dist32s, [] );
34 cvConvertScale( g.dist32s, g.dist8u1, 1, 0 );
35 cvConvertScale( g.dist32s, g.dist32s, -1, 0 );
36 cvAddS( g.dist32s, cvScalarAll(255), g.dist32s, [] );
37 cvConvertScale( g.dist32s, g.dist8u2, 1, 0 );
38 cvMerge( g.dist8u1, g.dist8u2, g.dist8u2, [], g.dist8u );
39 cvShowImage( g.wndname, g.dist8u );
45 filename = "../c/stuff.jpg";
46 if (size(argv, 1) > 1)
50 g.gray = cvLoadImage( filename, 0 );
51 if (!swig_this(g.gray))
52 printf("Failed to load %s\n",filename);
56 ## Create the output image
57 g.dist = cvCreateImage( cvSize(g.gray.width,g.gray.height), IPL_DEPTH_32F, 1 );
58 g.dist8u1 = cvCloneImage( g.gray );
59 g.dist8u2 = cvCloneImage( g.gray );
60 g.dist8u = cvCreateImage( cvSize(g.gray.width,g.gray.height), IPL_DEPTH_8U, 3 );
61 g.dist32s = cvCreateImage( cvSize(g.gray.width,g.gray.height), IPL_DEPTH_32S, 1 );
63 ## Convert to grayscale
64 g.edge = cvCloneImage( g.gray );
67 cvNamedWindow( g.wndname, 1 );
70 cvCreateTrackbar( g.tbarname, g.wndname, edge_thresh, 255, @on_trackbar );
73 on_trackbar(edge_thresh);
75 ## Wait for a key stroke; the same function arranges events processing