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;}