2 #pragma package <opencv>
9 char wndname[] = "Distance transform";
10 char tbarname[] = "Threshold";
11 int mask_size = CV_DIST_MASK_5;
12 int build_voronoi = 0;
13 int edge_thresh = 100;
14 int dist_type = CV_DIST_L1;
16 // The output and temporary images
18 IplImage* dist8u1 = 0;
19 IplImage* dist8u2 = 0;
21 IplImage* dist32s = 0;
27 // threshold trackbar callback
28 void on_trackbar( int dummy )
30 static const uchar colors[][3] =
43 int msize = mask_size;
44 int _dist_type = build_voronoi ? CV_DIST_L2 : dist_type;
46 cvThreshold( gray, edge, (float)edge_thresh, (float)edge_thresh, CV_THRESH_BINARY );
49 msize = CV_DIST_MASK_5;
51 if( _dist_type == CV_DIST_L1 )
53 cvDistTransform( edge, edge, _dist_type, msize, NULL, NULL );
54 cvConvert( edge, dist );
57 cvDistTransform( edge, dist, _dist_type, msize, NULL, build_voronoi ? labels : NULL );
61 // begin "painting" the distance transform result
62 cvConvertScale( dist, dist, 5000.0, 0 );
63 cvPow( dist, dist, 0.5 );
65 cvConvertScale( dist, dist32s, 1.0, 0.5 );
66 cvAndS( dist32s, cvScalarAll(255), dist32s, 0 );
67 cvConvertScale( dist32s, dist8u1, 1, 0 );
68 cvConvertScale( dist32s, dist32s, -1, 0 );
69 cvAddS( dist32s, cvScalarAll(255), dist32s, 0 );
70 cvConvertScale( dist32s, dist8u2, 1, 0 );
71 cvMerge( dist8u1, dist8u2, dist8u2, 0, dist8u );
72 // end "painting" the distance transform result
77 for( i = 0; i < labels->height; i++ )
79 int* ll = (int*)(labels->imageData + i*labels->widthStep);
80 float* dd = (float*)(dist->imageData + i*dist->widthStep);
81 uchar* d = (uchar*)(dist8u->imageData + i*dist8u->widthStep);
82 for( j = 0; j < labels->width; j++ )
84 int idx = ll[j] == 0 || dd[j] == 0 ? 0 : (ll[j]-1)%8 + 1;
85 int b = cvRound(colors[idx][0]);
86 int g = cvRound(colors[idx][1]);
87 int r = cvRound(colors[idx][2]);
95 cvShowImage( wndname, dist8u );
98 int main( int argc, char** argv )
100 char* filename = argc == 2 ? argv[1] : (char*)"stuff.jpg";
102 if( (gray = cvLoadImage( filename, 0 )) == 0 )
105 printf( "Hot keys: \n"
106 "\tESC - quit the program\n"
107 "\tC - use C/Inf metric\n"
108 "\tL1 - use L1 metric\n"
109 "\tL2 - use L2 metric\n"
110 "\t3 - use 3x3 mask\n"
111 "\t5 - use 5x5 mask\n"
112 "\t0 - use precise distance transform\n"
113 "\tv - switch Voronoi diagram mode on/off\n"
114 "\tENTER - loop through all the modes\n" );
116 dist = cvCreateImage( cvGetSize(gray), IPL_DEPTH_32F, 1 );
117 dist8u1 = cvCloneImage( gray );
118 dist8u2 = cvCloneImage( gray );
119 dist8u = cvCreateImage( cvGetSize(gray), IPL_DEPTH_8U, 3 );
120 dist32s = cvCreateImage( cvGetSize(gray), IPL_DEPTH_32S, 1 );
121 edge = cvCloneImage( gray );
122 labels = cvCreateImage( cvGetSize(gray), IPL_DEPTH_32S, 1 );
124 cvNamedWindow( wndname, 1 );
126 cvCreateTrackbar( tbarname, wndname, &edge_thresh, 255, on_trackbar );
132 // Call to update the view
140 if( (char)c == 'c' || (char)c == 'C' )
141 dist_type = CV_DIST_C;
142 else if( (char)c == '1' )
143 dist_type = CV_DIST_L1;
144 else if( (char)c == '2' )
145 dist_type = CV_DIST_L2;
146 else if( (char)c == '3' )
147 mask_size = CV_DIST_MASK_3;
148 else if( (char)c == '5' )
149 mask_size = CV_DIST_MASK_5;
150 else if( (char)c == '0' )
151 mask_size = CV_DIST_MASK_PRECISE;
152 else if( (char)c == 'v' )
154 else if( (char)c == '\n' || (char)c == '\r' )
159 mask_size = CV_DIST_MASK_3;
160 dist_type = CV_DIST_C;
162 else if( dist_type == CV_DIST_C )
163 dist_type = CV_DIST_L1;
164 else if( dist_type == CV_DIST_L1 )
165 dist_type = CV_DIST_L2;
166 else if( mask_size == CV_DIST_MASK_3 )
167 mask_size = CV_DIST_MASK_5;
168 else if( mask_size == CV_DIST_MASK_5 )
169 mask_size = CV_DIST_MASK_PRECISE;
170 else if( mask_size == CV_DIST_MASK_PRECISE )
175 cvReleaseImage( &gray );
176 cvReleaseImage( &edge );
177 cvReleaseImage( &dist );
178 cvReleaseImage( &dist8u );
179 cvReleaseImage( &dist8u1 );
180 cvReleaseImage( &dist8u2 );
181 cvReleaseImage( &dist32s );
182 cvReleaseImage( &labels );
184 cvDestroyWindow( wndname );