从一幅大图像中,取出一小块图像并保存这一个小块图像。
/* 读取大图像 */
<span style="font-size:18px;">IplImage *img1 = cvLoadImage("test.jpg", 1);</span>
/* 设置图像的ROI区域,注意ROI区域不要越界,必须在大图像的内部 */
-
<span style=
"font-size:18px;">
int height = src->height;
-
int width = src->width;
-
cvSetImageROI(img1, cvRect(width/
5, height/
5,
3*width/
5,
3*height/
5));</span>
img已经设置了ROI,所以cvGetSize函数对ROI区域有效,所以,返回的是ROI区域的宽度和高度 */
-
<span style=
"font-size:18px;">IplImage *img2 = cvCreateImage(cvGetSize(img1),
-
img1->depth,
-
img1->nChannels);</span>
/* 把img1的ROI区域拷贝到img2*/
<span style="font-size:18px;">cvCopy(img1, img2, NULL);</span>
/* 取消img1上的ROI区域 */
<span style="font-size:18px;">cvResetImageROI(img1);</span>
最后就得到图片img1的一个子图img2,可以根据这个方法对图片进行任意的分割
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