Hello good evening I started researching about getting the ROI of an image and from what I understand is using function RECT I've tried but I get an error and honestly do not quite understand its parameters mean, if someone can help me roi get the picture attached below.
My code is the next
Mat image;
image = imread(argv[1]);
int alto = 100;
Rect roi(0,(image.rows)-alto,image.cols,alto);
Mat imgROI = image(roi);
imwrite("ROI.jpg",imgROI);
and the error is the next
Sizes of input arguments do not match (The operation is neither 'array op array' (where arrays have the same size and type), nor 'array op scalar', nor 'scalar op array') in binary_op, file /home/jenny/Downloads/opencv-2.4.9/modules/core/src/arithm.cpp, line 1021 terminate called after throwing an instance of 'cv::Exception'