//注意输入和输出的通道数要相同，否则会出错：）
IplImage* grayImage=cvCreateImage(cvSize(frame->width,frame->height),IPL_DEPTH_16S,3);
cvSobel(frame,grayImage,0,1,3);
IplImage* destination;
destination=cvCreateImage(cvGetSize(grayImage),IPL_DEPTH_8U,3);
cvConvertScale(grayImage,destination,1,0);
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