How can I do image processing operations only in ROI part of original image directly?

Question

Is that possible by using OpenCV to do some image processing operations only in ROI part of original image?

I search some articles on Internet. Most of codes look li

Answer 1

I have burred the region of interest and segmented the blurred region, you can perform image processing operation on the blurred region in an original image or you can perform on segmented region.

int main() {

    Mat image;
    image=imread("Light.jpg",1);

   // image = cv::imread(argv[1], CV_LOAD_IMAGE_COLOR);   
    Rect roi( 100, 100,200, 200);
    Mat blur;
    GaussianBlur(image(roi), blur, Size(0, 0), 4); 
    imshow("blurred region",blur);
    //do some operations on roi
    imshow("aaaa",image);
    waitKey(0);
    return 0;
}