OpenCV截取图像ROI并保存于指定路径

1.所用主要函数    

http://www.cnblogs.com/zcftech/archive/2013/04/09/3011225.html

OpenCV设置ROI函数  cvSetImageROI( )：

void cvSetImageROI(IplImage* image，CvRect rect);

image        图像头,待处理图像

rect ROI     矩形

释放基于给定的矩形设置图像的ROI函数  cvResetImageROI( ):

void cvResetImageROI(IplImage* image);

　image        图像头,待处理图像

保存图像函数cvSaveImage( );

cvSaveImage(const char* filename, const CvArr* image);

filename     文件名
image        要保存的图像

函数cvSaveImage保存图像到指定文件。只有8位单通道或者3通道(通道顺序为'BGR')可以使用这个函数保存。

如果格式,深度或者通道不符合要求，请先用cvCvtScale和cvCvtColor转换。

2.例子：

<span style="font-size:10px;"><span style="font-size:12px;">#include <cv.h>
#include<highgui.h>

int main()
{
    //Loading the original image and declaring the variables
    IplImage* src=cvLoadImage("D:\\Study Documents\\opencv_source\\images\\lena.jpg");
    CvSize size=cvSize(100,120);
    IplImage* roi=cvCreateImage(size,src->depth,src->nChannels);
    CvRect box=cvRect(120,100,size.width,size.height);

    //Setting the ROI and copying it
    cvSetImageROI(src,box);
    cvCopy(src,roi);
    cvSaveImage("D:\\Study Documents\\opencv_source\\images\\lenaROI.jpg",roi);
    cvResetImageROI(src);

    //Defining windows
    cvNamedWindow("ShowSRC");
    cvNamedWindow("ShowROI");

    //Showing images
    cvShowImage("ShowSRC",src);
    cvShowImage("ShowROI",roi);

    cvWaitKey(0);

    //Releasing resources
    cvReleaseImage(&src);
    cvReleaseImage(&roi);
    cvDestroyAllWindows();

    return 0;
}span>span>

#include 
#include

int main()
{
	//Loading the original image and declaring the variables
	IplImage* src=cvLoadImage("D:\\Study Documents\\opencv_source\\images\\lena.jpg");
	CvSize size=cvSize(100,120);
	IplImage* roi=cvCreateImage(size,src->depth,src->nChannels);
	CvRect box=cvRect(120,100,size.width,size.height);
	
	//Setting the ROI and copying it
	cvSetImageROI(src,box);
	cvCopy(src,roi);
	cvSaveImage("D:\\Study Documents\\opencv_source\\images\\lenaROI.jpg",roi);
	cvResetImageROI(src);
	
	//Defining windows
	cvNamedWindow("ShowSRC");
	cvNamedWindow("ShowROI");
	
	//Showing images
	cvShowImage("ShowSRC",src);
	cvShowImage("ShowROI",roi);

	cvWaitKey(0);
	
	//Releasing resources
	cvReleaseImage(&src);
	cvReleaseImage(&roi);
	cvDestroyAllWindows();
	
	return 0;	
}