OpenCV代码功能：检测并画出图像中的轮廓

主要函数：cvFindContours、cvDrawContours

#include
#include
#include
#include

void main()
{
? ? int i=0;
? ? int mode=CV_RETR_CCOMP;? ? ? ? ? //the mode of contours
? ? int num_contours=0;
? ? CvScalar ext_color,inn_color;
? ?
? ? CvMemStorage*storage=cvCreateMemStorage(0);
? ? CvSeq*contour=0;

? ? IplImage*pimg=NULL;
? ? IplImage*CTImg=NULL;
? ? IplImage*src=cvLoadImage("test.bmp",-1);

? ? pimg=cvCreateImage(cvGetSize(src),src->depth,1);
? ? CTImg=cvCreateImage(cvGetSize(pimg),IPL_DEPTH_8U,3);
? ? cvCvtColor(src,pimg,CV_BGR2GRAY);

? ? cvNamedWindow("source",CV_WINDOW_AUTOSIZE);
? ? cvNamedWindow("gray",CV_WINDOW_AUTOSIZE);
? ? cvNamedWindow("contours",CV_WINDOW_AUTOSIZE);

? ? cvShowImage("source",src);
? ? //cvThreshold(pimg,pimg,200,250,CV_THRESH_BINARY);
? ? cvErode(pimg,pimg,0,1);
? ? cvDilate(pimg,pimg,0,1);
? ? cvCanny(pimg,pimg,2,20,3);
? ? //cvErode(pimg,pimg,0,2);
? ? //cvDilate(pimg,pimg,0,1);
? ? //Find the Contours
? ? mode=CV_RETR_LIST;
? ? num_contours=cvFindContours(pimg,storage,&contour,sizeof(CvContour),mode,CV_CHAIN_APPROX_NONE);
? ? cout<<"The number of the contours is :"<? ? //Draw the Contours
? ? for (;contour!=0;contour=contour->h_next)
? ? {
? ? ? ? inn_color=CV_RGB(rand()&255,rand()&255,rand()&255);
? ? ? ? ext_color=CV_RGB(rand()&255,rand()&255,rand()&255);
? ? ? ? cvDrawContours(CTImg,contour,ext_color,inn_color,1,2,8,cvPoint(0,0));
? ? }

? ? cvShowImage("gray",pimg);
? ? cvShowImage("contours",CTImg);
? ? cvWaitKey(0);
? ? cvSaveImage("Contours.bmp",CTImg);
? ? cvSaveImage("Canny.bmp",pimg);

? ? cvReleaseImage(&pimg);
? ? cvReleaseImage(&CTImg);
? ? cvReleaseImage(&src);
? ? cvReleaseMemStorage(&storage);

? ? cvDestroyAllWindows();

}

效果图：

? ?

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