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Opencv中提供了很多關於影象輪廓處理的函式，這裡我用cvFindContours函式來提取輪廓，並用cvDrawContours函式將提取的輪廓畫出來。函式cvFindContours的第一個引數就是我們要進行提取輪廓的目標影象，這裡要注意，這個影象

#include<cv.h>#include<highgui.h>int main(){ IplImage* src = NULL; IplImage* img = NULL; IplImage* dst = NULL; CvMemStorage* storage = cvCreateMemStorage (0);; CvSeq* contour = 0
 
; int contours = 0; CvScalar external_color; CvScalar hole_color; src = cvLoadImage ("test.jpg", 1); img = cvCreateImage (cvGetSize(src), IPL_DEPTH_8U, 1); dst = cvCreateImage (cvGetSize(src), src->depth, src->nChannels); cvCvtColor (src, img, CV_BGR2GRAY); cvThreshold (img, img, 100
 
, 200, CV_THRESH_BINARY); contours = cvFindContours (img, storage, &contour, sizeof(CvContour), CV_RETR_LIST, CV_CHAIN_APPROX_NONE); for (;contour != 0; contour = contour->h_next) {  external_color = CV_RGB(rand()&255, rand()&255, rand()&255);  hole_color = CV_RGB(rand()&255, rand()&255, rand()&255);  cvDrawContours (dst, contour, external_color, hole_color, 1, 2, 8); } cvNamedWindow ("Contour", 1); cvShowImage ("Contour", dst); cvWaitKey (0); cvReleaseMemStorage (&storage); cvReleaseImage (&src); cvReleaseImage (&img); cvReleaseImage (&dst); return 0;}

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