opencv内对ROI的操作

opencv支持对图像中ROI的内容进行单独操作，利用cvSetImageROI和cvResetImageROI，用法如下：

roi_add <image> <x> <y> <width> <height> <add>

 

示例代码如下：

#include <cv.h>
#include <highgui.h>

int main(int argc, char** argv){
    IplImage* src;
    if (argc == 7 && ((src = cvLoadImage(argv[1],CV_LOAD_IMAGE_ANYCOLOR)) != 0)){
        int x = atoi(argv[2]);
        int y = atoi(argv[3]);
        int width = atoi(argv[4]);
        int height = atoi(argv[5]);
        int add = atoi(argv[6]);
        cvSetImageROI(src, cvRect(x, y, width, height));
        cvAddS(src, cvScalar(add,add,add,add), src,NULL);
        cvResetImageROI(src);
        cvNamedWindow("roi_add", 1);
        cvShowImage("roi_add", src);
        cvWaitKey(0);
    }
    return 0;
}