openCv裁剪图像 [英] openCv crop image

问题描述

我遇到了问题，我的openCv IplImage裁剪。假设tmp和img都是IplImage *。使用代码：

I running into problems with my openCv IplImage cropping. Assuming both tmp and img are IplImage* . Using the code:

printf("Orig dimensions: %dx%d\n", img->width, img->height);
cvSetImageROI(img, cvRect(0, 0,500,500));
tmp = cvCreateImage(cvGetSize(img),img->depth,img->nChannels);
cvCopy(img, tmp, NULL);
cvResetImageROI(img);
img = cvCloneImage(tmp);
printf("Orig dimensions after crop: %dx%d\n", tmp->width, tmp->height);

当我使用上面的cvRect时，我会得到裁剪为500 x500的图片。

when I use the the cvRect above I'll get an image cropped with a size of 500 x500 as expected, however when i use the rect (400,400,500,500) I'll get an image with the size 500 X 320.

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