OpenCV处理视频的程序有点问题...

[没有昵称阿]

我现在用VS2008+OpenCV处理视频，把彩色视频灰度化，然后Canny边缘检测，最后把三个视频在同一个窗口中显示。
这个题是《学习OpenCV》第四章的课后习题第一题。

但是显示出来的三个画面全是边缘检测后的啊。是在找不出问题所在了，求大家指导~~

要把这些加入到项目的链接-输入-附加依赖项里面。opencv_core220d.lib opencv_highgui220d.lib opencv_imgproc220d.lib

代码：

#include "opencv\cv.h"
#include "opencv\highgui.h"

//Canny边缘检测算法
IplImage* doCanny(
	IplImage* in,
	int lowThresh,
	int highThresh,
	int aperture
	){
		if(in->nChannels != 1)return 0;
		IplImage* out = cvCreateImage(
			cvGetSize(in),
			IPL_DEPTH_8U,
			1);
		cvCanny(in,out,lowThresh,highThresh,aperture);
		return out;
}

int main(){
	CvCapture* capture = cvCreateFileCapture("test.avi");
	//把三个画面在一个窗口里面显示
	cvNamedWindow("window_all");
	cvNamedWindow("window");
	cvNamedWindow("window_gray");
	cvNamedWindow("window_Canny");

	//视频的每一帧
	IplImage* frame = NULL;
	frame = cvQueryFrame(capture);
	//视频帧图像的宽度和高度
	int width = (int)cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_WIDTH);
	int height = (int)cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_HEIGHT);
	//定义两种，是为了使三种图像的通道数一样，便于一起显示
	//单通道灰度图像
	IplImage* gray = cvCreateImage(
		cvSize(width, height),
		IPL_DEPTH_8U,
		1);
	//3通道灰度图像
	IplImage* frame_gray = cvCreateImage(
		cvSize(width, height),
		IPL_DEPTH_8U,
		3);
	//单通道Canny边缘检测图像
	IplImage* Canny = cvCreateImage(
		cvSize(width, height),
		IPL_DEPTH_8U,
		1);
	//3通道Canny边缘检测图像
	IplImage* frame_Canny = cvCreateImage(
		cvSize(width, height),
		IPL_DEPTH_8U,
		3);
	//把3张图像放在一起显示
	IplImage* frame_all = cvCreateImage(
		cvSize(width * 3,height),
		IPL_DEPTH_8U,
		3);
	cvZero(frame_all);
	//定义三个图像头
	IplImage* img1 = cvCreateImageHeader(cvSize(width, height),frame ->depth,3);
	IplImage* img2 = cvCreateImageHeader(cvSize(width, height),frame ->depth,3);
	IplImage* img3 = cvCreateImageHeader(cvSize(width, height),frame ->depth,3);
	img1 ->origin = frame ->origin;
	img1 ->widthStep = frame ->widthStep;
	img1->depth = frame->depth;
	img1 ->nChannels = 3;
	img2 ->origin = frame ->origin;
	img2 ->widthStep = frame ->widthStep;
	img2->depth = frame->depth;
	img2 ->nChannels = 3;
	img3 ->origin = frame ->origin;
	img3 ->widthStep = frame ->widthStep;
	img3->depth = frame->depth;
	img3 ->nChannels = 3;

	while(1){
		frame = cvQueryFrame(capture);
		if(!frame){
			return 1;
		}
		//将彩色图像转化为灰色图像
		cvCvtColor(frame,gray,CV_RGB2GRAY);
		cvCvtColor(gray,frame_gray,CV_GRAY2BGR);
		Canny = doCanny(gray,10,100,3);
		cvCvtColor(Canny,frame_Canny,CV_GRAY2BGR);

		img1 ->imageData = frame_all ->imageData;
		cvCopy(frame,img1);
		
		img2 ->imageData = frame_all ->imageData + frame ->widthStep;
		
		cvCopy(frame_gray,img2);
		cvShowImage("window",img1);
		cvShowImage("window_gray",img2);
		img3 ->imageData = frame_all ->imageData + 2 * frame ->widthStep;
		cvCopy(frame_Canny,img3);
		cvShowImage("window_Canny",img3);

		cvShowImage("window_all",frame_all);
		
		
		
		
		if(cvWaitKey(33) == 27){//每秒显示30帧
			break;
		}
	}
	cvReleaseImage(&frame);
	cvReleaseImage(&gray);
	cvReleaseImage(&frame_gray);
	cvReleaseImage(&Canny);
	cvReleaseImage(&frame_Canny);
	cvReleaseImage(&img1);
	cvReleaseImage(&img2);
	cvReleaseImage(&img3);
	cvReleaseCapture(&capture);
	cvDestroyWindow("window_all");
	cvDestroyWindow("window");
	cvDestroyWindow("window_gray");
	cvDestroyWindow("window_Canny");
}

[ryfdizuo]

img2 ->imageData = frame_all ->imageData + frame ->widthStep;
这里偏移不对吧。widthStep乘以height试试

[没有昵称阿]

木有人学习OpenCV吗？

[tut2tut]

frame ->widthStep 是指一行图像的内存大小，你创建的frame_all每行就是3*frame ->widthStep，而图像在内存中的排列是一行接一行的，+ frame ->widthStep 只是跳过 frame宽度大小的内存，并不是说从这里开始下面的内存都是属于这幅图像的。 你可以试试设置mask，cvCopy(const CvArr* src, CvArr* dst, const CvArr* mask=NULL)。 或着竖排图像。