4. 把一幅彩色图像的R、G、B分量单独显示。

#include <cv.h>
#include <highgui.h> 

int main(void)
{
    IplImage* oo = cvLoadImage("6013202130.jpg", );
    IplImage * Red = cvCreateImage(cvGetSize(oo), , );
    IplImage * Green = cvCreateImage(cvGetSize(oo), , );
    IplImage * Blue = cvCreateImage(cvGetSize(oo), , );
    cvSetImageCOI(oo, );       //通道1 ，蓝色
    cvCopy(oo, Blue);   //复制到Blue
    cvSetImageCOI(oo, );       //通道2 ，绿色
    cvCopy(oo, Green);
    cvSetImageCOI(oo, );       //通道3 ，红色
    cvCopy(oo, Red);
    cvNamedWindow("Red", );
    cvNamedWindow("Green", );
    cvNamedWindow("Blue", );
    cvNamedWindow("oo", );
    cvShowImage("原图", oo);
    cvShowImage("Red", Red);
    cvShowImage("Green", Green);
    cvShowImage("Blue", Blue);
    cvWaitKey();
    cvReleaseImage(&Red);
    cvReleaseImage(&Green);
    cvReleaseImage(&Blue);
    cvReleaseImage(&oo);
    return ;
}