+++ /dev/null
-char wndname01[] = "Source image";\r
-char wndname02[] = "Thrshold image";\r
-char barname01[] = "Threshold factor";\r
-int slider_pos[1] = {0};\r
-\r
-\r
-// Load the source image. HighGUI use.\r
-IPLIMAGE image01 = load_iplimage("image009.bmp");\r
-\r
-// Create the destination images. HighGUI use.\r
-IPLIMAGE image02 = cvCreateImage(cvSize(image01->width, image01->height),\r
- image01->depth,\r
- 1);\r
-\r
-IPLIMAGE image03 = cvCreateImage(cvSize(image01->width, image01->height),\r
- image01->depth,\r
- 1); \r
-// Make onechannel image.\r
-cvCvtColor(image01,image03, CV_BGR2GRAY);\r
- \r
-\r
-// Create windows. HighGUI use.\r
-named_window(wndname01, 0);\r
-named_window(wndname02, 0);\r
-\r
-// Show the image. HighGUI use.\r
-show_iplimage(wndname01, image03);\r
-\r
-\r
-// Define trackbar callback functon. This function find contours,\r
-// draw it and approximate it by lines.\r
-void func(int h)\r
-{\r
- CvMemStorage* stor;\r
- CvSeq* cont;\r
- float * line;\r
- CvPoint* PointArray;\r
- CvPoint2D32f* PointArray2D32f;\r
- CvPoint FirstPoint;\r
- CvPoint LastPoint;\r
- \r
- // Create dynamic structure and sequence.\r
- stor = cvCreateMemStorage(0);\r
- cont = cvCreateSeq(CV_SEQ_ELTYPE_POINT, sizeof(CvSeq), sizeof(CvPoint) , stor);\r
- \r
- // Threshold the source image. This needful for cvFindContours().\r
- cvThreshold( image03, image02, slider_pos[0], 255, CV_THRESH_BINARY );\r
- \r
- // Find all contours.\r
- cvFindContours( image02, stor, &cont, sizeof(CvContour), \r
- CV_RETR_LIST, CV_CHAIN_APPROX_NONE);\r
- \r
- // Clear image. IPL use.\r
- cvSetZero(image02);\r
- \r
- // This cycle draw all contours and approximate it by lines.\r
- for(;cont;cont = cont->h_next)\r
- { \r
- int i; // Indicator of cycle.\r
- int count = cont->total; // This is number point in contour\r
- \r
- \r
- // Alloc memory for contour point set. \r
- PointArray = malloc( count*sizeof(CvPoint) );\r
- PointArray2D32f= malloc( count*sizeof(CvPoint2D32f) );\r
- \r
- // Alloc memory for line data.\r
- line = malloc(4*sizeof(float));\r
- // Get contour point set.\r
- cvCvtSeqToArray(cont, PointArray, CV_WHOLE_SEQ);\r
- \r
- // Convert CvPoint set to CvBox2D32f set.\r
- for(i=0; i<count; i++)\r
- {\r
- PointArray2D32f[i].x = PointArray[i].x;\r
- PointArray2D32f[i].y = PointArray[i].y;\r
- }\r
- \r
- // Fits line to current contour.\r
- cvFitLine2D(PointArray2D32f,cont->total,CV_DIST_L2,NULL,0.01,0.01,line);\r
- \r
- FirstPoint.x=line[2]-100*line[0];\r
- FirstPoint.y=line[3]-100*line[1];\r
- \r
- LastPoint.x=line[2]+100*line[0];\r
- LastPoint.y=line[3]+100*line[1];\r
- \r
- // Draw current contour.\r
- cvDrawContours(image02,cont,255,255,0,1,8);\r
- //Fits lines only to sufficiently large contours\r
- if (cont->total > 50 ) \r
- cvLine(image02,FirstPoint,LastPoint,150,1,0);\r
- \r
- // Free memory. \r
- free(PointArray);\r
- free(PointArray2D32f);\r
- free(line);\r
- }\r
- \r
- // Show image. HighGUI use. \r
- show_iplimage(wndname02, image02);\r
- }\r
-\r
-\r
-func(0);\r
-\r
-// Create toolbars. HighGUI use.\r
-create_trackbar(barname01, wndname02, &slider_pos[0], 255, func);\r
-\r
-\r
-// Wait for a key stroke; the same function arranges events processing \r
-wait_key(0);\r
-cvReleaseImage(&image01);\r
-cvReleaseImage(&image02);\r
-cvReleaseImage(&image03);\r
-\r
-destroy_window(wndname01);\r
-destroy_window(wndname02);\r
-\r
-
\ No newline at end of file