核心函数:cvPyrDown，cvCanny

程序:

#include "cv.h"#include "cxcore.h"#include "highgui.h"#include 
     
      #include "function.h"int FindBorder_Canny(int argc,char** argv){IplImage* src=cvLoadImage("e:\\picture\\11.jpg",0);cvNamedWindow("src");cvShowImage("src",src);IplImage* HalfSizeDst=HalfSize(src);HalfSizeDst=HalfSize(HalfSizeDst);IplImage* CannyDst=cvCreateImage(cvGetSize(HalfSizeDst),HalfSizeDst->depth,HalfSizeDst->nChannels);cvCanny(HalfSizeDst,CannyDst,50,150,3);cvNamedWindow("CannyDst");cvShowImage("CannyDst",CannyDst);cvWaitKey(0);cvDestroyWindow("src");cvDestroyWindow("CannyDst");cvReleaseImage(&src);cvReleaseImage(&CannyDst);return 0;}