人脸识别中截取面部的实现方法

void GetImageRect(IplImage* orgImage, CvRect rectInImage, IplImage* imgRect,double scale)
{
	//从图像orgImage中提取一块（rectInImage）子图像imgRect
	IplImage *result=imgRect;
	CvRect size;
	size.x=rectInImage.x*scale;
	size.y=rectInImage.y*scale;
	size.width=rectInImage.width*scale;
	size.height=rectInImage.height*scale;

	//result=cvCreateImage( size, orgImage->depth, orgImage->nChannels );
	//从图像中提取子图像
	cvSetImageROI(orgImage,size);
	cvCopy(orgImage,result);
	cvResetImageROI(orgImage);
}
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