opencv cvSplit cvMerge

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/* Splits a multi-channel array into the set of single-channel arrays or   extracts particular [color] plane */CVAPI(void)  cvSplit( const CvArr* src, CvArr* dst0, CvArr* dst1,                      CvArr* dst2, CvArr* dst3 );

作用：将多通道图像分离为单通道图像

src：多通道源图像

dst0、dst1、dst2、dst3：单通道结果图像

源图像和结果图像的大小相同，深度类型相同，仅有通道类型不同

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/* Merges a set of single-channel arrays into the single multi-channel array   or inserts one particular [color] plane to the array */CVAPI(void)  cvMerge( const CvArr* src0, const CvArr* src1,                      const CvArr* src2, const CvArr* src3,                      CvArr* dst );

作用：将单通道图像合并为多通道图像

src0、src1、src2、src3：单通道源图像

dst：多通道结果图像

源图像和结果图像的大小相同，深度类型相同，仅有通道类型不同

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程序：将图像lena.jpg分离为三个单通道图像c1、c2、c3，再将其合并为单通道图像（蓝、绿、红）

void splitAndMerge(void){IplImage *img=cvLoadImage("lena.jpg");IplImage *c1=cvCreateImage(cvGetSize(img), img->depth, 1);IplImage *c2=cvCreateImage(cvGetSize(img), img->depth, 1);IplImage *c3=cvCreateImage(cvGetSize(img), img->depth, 1);IplImage *rImg=cvCreateImage(cvGetSize(img), img->depth, 3);IplImage *gImg=cvCreateImage(cvGetSize(img), img->depth, 3);IplImage *bImg=cvCreateImage(cvGetSize(img), img->depth, 3);if (NULL == img || NULL == c1 || NULL == c2 || NULL == c3 || NULL == rImg || NULL == gImg || NULL == bImg)exit(0);cvSplit(img, c1, c2, c3, NULL);cvNamedWindow("img");cvShowImage("img", img);cvZero(rImg);cvZero(gImg);cvZero(bImg);cvMerge(c1, NULL, NULL, NULL, bImg);cvMerge(NULL, c2, NULL, NULL, gImg);cvMerge(NULL, NULL, c3, NULL, rImg);cvNamedWindow("rImg");cvNamedWindow("gImg");cvNamedWindow("bImg");cvShowImage("rImg", rImg);cvShowImage("gImg", gImg);cvShowImage("bImg", bImg);cvWaitKey(0);cvReleaseImage(&img);cvReleaseImage(&c1);cvReleaseImage(&c2);cvReleaseImage(&c3);cvReleaseImage(&rImg);cvReleaseImage(&gImg);cvReleaseImage(&bImg);cvDestroyAllWindows();}

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