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distrans.c
Package: Opencv-source-code.rar [view]
Upload User: banwdc
Upload Date: 2016-06-25
Package Size: 2871k
Code Size: 4k
Category:
OpenCV
Development Platform:
Visual C++
- #include "cv.h"
- #include "highgui.h"
- #include <stdio.h>
- char wndname[] = "Distance transform";
- char tbarname[] = "Threshold";
- int mask_size = CV_DIST_MASK_5;
- int build_voronoi = 0;
- int edge_thresh = 100;
- // The output and temporary images
- IplImage* dist = 0;
- IplImage* dist8u1 = 0;
- IplImage* dist8u2 = 0;
- IplImage* dist8u = 0;
- IplImage* dist32s = 0;
- IplImage* gray = 0;
- IplImage* edge = 0;
- IplImage* labels = 0;
- // threshold trackbar callback
- void on_trackbar( int dummy )
- {
- static const uchar colors[][3] =
- {
- {0,0,0},
- {255,0,0},
- {255,128,0},
- {255,255,0},
- {0,255,0},
- {0,128,255},
- {0,255,255},
- {0,0,255},
- {255,0,255}
- };
- int msize = mask_size;
- cvThreshold( gray, edge, (float)edge_thresh, (float)edge_thresh, CV_THRESH_BINARY );
- if( build_voronoi )
- msize = CV_DIST_MASK_5;
- cvDistTransform( edge, dist, CV_DIST_L2, msize, NULL, build_voronoi ? labels : NULL );
- if( !build_voronoi )
- {
- // begin "painting" the distance transform result
- cvConvertScale( dist, dist, 5000.0, 0 );
- cvPow( dist, dist, 0.5 );
- cvConvertScale( dist, dist32s, 1.0, 0.5 );
- cvAndS( dist32s, cvScalarAll(255), dist32s, 0 );
- cvConvertScale( dist32s, dist8u1, 1, 0 );
- cvConvertScale( dist32s, dist32s, -1, 0 );
- cvAddS( dist32s, cvScalarAll(255), dist32s, 0 );
- cvConvertScale( dist32s, dist8u2, 1, 0 );
- cvMerge( dist8u1, dist8u2, dist8u2, 0, dist8u );
- // end "painting" the distance transform result
- }
- else
- {
- int i, j;
- for( i = 0; i < labels->height; i++ )
- {
- int* ll = (int*)(labels->imageData + i*labels->widthStep);
- float* dd = (float*)(dist->imageData + i*dist->widthStep);
- uchar* d = (uchar*)(dist8u->imageData + i*dist8u->widthStep);
- for( j = 0; j < labels->width; j++ )
- {
- int idx = ll[j] == 0 || dd[j] == 0 ? 0 : (ll[j]-1)%8 + 1;
- int b = cvRound(colors[idx][0]);
- int g = cvRound(colors[idx][1]);
- int r = cvRound(colors[idx][2]);
- d[j*3] = (uchar)b;
- d[j*3+1] = (uchar)g;
- d[j*3+2] = (uchar)r;
- }
- }
- }
- cvShowImage( wndname, dist8u );
- }
- int main( int argc, char** argv )
- {
- char* filename = argc == 2 ? argv[1] : (char*)"stuff.jpg";
- if( (gray = cvLoadImage( filename, 0 )) == 0 )
- return -1;
- printf( "Hot keys: n"
- "tESC - quit the programn"
- "t3 - use 3x3 maskn"
- "t5 - use 5x5 maskn"
- "t0 - use precise distance transformn"
- "tv - switch Voronoi diagram mode on/offn"
- "tENTER - loop through all the modesn" );
- dist = cvCreateImage( cvGetSize(gray), IPL_DEPTH_32F, 1 );
- dist8u1 = cvCloneImage( gray );
- dist8u2 = cvCloneImage( gray );
- dist8u = cvCreateImage( cvGetSize(gray), IPL_DEPTH_8U, 3 );
- dist32s = cvCreateImage( cvGetSize(gray), IPL_DEPTH_32S, 1 );
- edge = cvCloneImage( gray );
- labels = cvCreateImage( cvGetSize(gray), IPL_DEPTH_32S, 1 );
- cvNamedWindow( wndname, 1 );
- cvCreateTrackbar( tbarname, wndname, &edge_thresh, 255, on_trackbar );
- for(;;)
- {
- int c;
- // Call to update the view
- on_trackbar(0);
- c = cvWaitKey(0);
- if( (char)c == 27 )
- break;
- if( (char)c == '3' )
- mask_size = CV_DIST_MASK_3;
- else if( (char)c == '5' )
- mask_size = CV_DIST_MASK_5;
- else if( (char)c == '0' )
- mask_size = CV_DIST_MASK_PRECISE;
- else if( (char)c == 'v' )
- build_voronoi ^= 1;
- else if( (char)c == 'n' )
- {
- if( build_voronoi )
- {
- build_voronoi = 0;
- mask_size = CV_DIST_MASK_3;
- }
- else if( mask_size == CV_DIST_MASK_3 )
- mask_size = CV_DIST_MASK_5;
- else if( mask_size == CV_DIST_MASK_5 )
- mask_size = CV_DIST_MASK_PRECISE;
- else if( mask_size == CV_DIST_MASK_PRECISE )
- build_voronoi = 1;
- }
- }
- cvReleaseImage( &gray );
- cvReleaseImage( &edge );
- cvReleaseImage( &dist );
- cvReleaseImage( &dist8u );
- cvReleaseImage( &dist8u1 );
- cvReleaseImage( &dist8u2 );
- cvReleaseImage( &dist32s );
- cvReleaseImage( &labels );
- cvDestroyWindow( wndname );
- return 0;
- }