android opencv cvgetsubrect,cvGetCol与cvGetCols 获取列 cvGetSubRect获取图像的矩形区域

程序：

代码：#include "cv.h"

#include "cxcore.h"

#include "highgui.h"

#include 

int GetCol(int argc,char** argv)

{

IplImage* src=cvLoadImage("e:\\picture\\4.jpg");

IplImage* dst1=cvCreateImage(cvSize(1,src->height),src->depth,src->nChannels);

cvZero(dst1);

IplImage* dst2=cvCreateImage(cvSize(20,src->height),src->depth,src->nChannels);

cvZero(dst2);

IplImage* dst3=cvCreateImage(cvSize(30,30),src->depth,src->nChannels);

cvZero(dst3);

cvGetCol(src,(CvMat*)dst1,10);  //获取第十列，注意这里并没有创建内存或者数据的复制，只是让dst1指向第十列

cvGetCols(src,(CvMat*)dst2,10,30);;

cvGetSubRect(src,(CvMat*)dst3,cvRect(10,10,30,30)); //获取图像的矩形区域

cvNamedWindow("src");

cvNamedWindow("dst1");

cvNamedWindow("dst2");

cvNamedWindow("dst3");

cvShowImage("src",src);

cvShowImage("dst1",dst1);

cvShowImage("dst2",dst2);

cvShowImage("dst3",dst3);

cvZero(dst2);            //由于只是让dst2指向源图像特定的列数，所以修改dst2也会修改原图像

cvNamedWindow("src2");

cvShowImage("src2",src);

cvWaitKey(0);

cvDestroyWindow("src");

cvDestroyWindow("dst1");

cvDestroyWindow("dst2");

cvDestroyWindow("dst3");

cvDestroyWindow("src2");

cvReleaseImage(&src);

cvReleaseImage(&dst1);

cvReleaseImage(&dst2);

cvReleaseImage(&dst3);

return 0;

}