使用Canny算子进行边缘检测，并分开输出到三个窗口中，再给每一个窗口添加文字 代码 ``` #include"cv.h" #include"highgui.h" //读入视频并转换为灰度图再作边缘检测 //并分开三个窗口输出 IplImage *frame,*gray,*canny,*uni,*temp; int wid=-1, hei=-1; int main(void) { CvCapture *src = cvCreateFileCapture("Megamind.avi"); //cvNamedWindow("Union"); cvNamedWindow("Origin"); cvNamedWindow("Gray"); cvNamedWindow("Canny"); CvFont r, g, c; cvInitFont(&r, CV_FONT_HERSHEY_TRIPLEX, 1, 1, 0); cvInitFont(&g, CV_FONT_HERSHEY_TRIPLEX, 1, 1, 0); cvInitFont(&c, CV_FONT_HERSHEY_TRIPLEX, 1, 1, 0); while (1) { frame = cvQueryFrame(src); if (!frame) break; /*if (wid == -1) { wid = frame->width; hei = frame->height; }*/ if (cvWaitKey(33) == 27) break; temp = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 3); cvCopy(frame, temp); cvPutText(temp, "Original", CvPoint(10, 30), &r, CV_RGB(0, 204, 153));//显示文字 cvShowImage("Origin", temp); gray = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 1);//先创建图像指针 cvConvertImage(frame, gray); canny = cvCreateImage(cvGetSize(gray), IPL_DEPTH_8U, 1);//同上先创建 cvPutText(gray, "Gray", CvPoint(10, 30), &g, CV_RGB(0, 204, 153));//显示文字 cvShowImage("Gray", gray);//显示到灰度窗口中 cvCanny(gray, canny, 20, 250, 3);//边缘检测处理 cvPutText(canny, "Canny", CvPoint(10, 30), &c, CV_RGB(0, 204, 153)); cvShowImage("Canny", canny);//显示到边缘检测窗口中 /*uni = cvCreateImage(CvSize(3 * frame->width, frame->width), IPL_DEPTH_8U,3); CvRect pos1 = CvRect(0, 0, wid, hei); CvRect pos2 = CvRect(wid, 0, wid, hei); CvRect pos3 = CvRect(2*wid, 0 ,wid, hei); cvSetImageROI(uni, pos1); cvCopy(frame, uni); cvResetImageROI(uni); cvSetImageROI(uni, pos2); uni->nChannels = 1; cvCopy(gray, uni); cvResetImageROI(uni); cvSetImageROI(uni, pos3); uni->nChannels = 1; cvCopy(canny, uni); cvResetImageROI(uni); cvShowImage("Union", uni);*/ } cvDestroyAllWindows(); cvReleaseCapture(&src); cvReleaseImage(&gray); cvReleaseImage(&canny); return 0; }**** ```