subtract one image from another using openCV

Question

How can I subtract one image from another using openCV?

Ps.: I coudn\'t use the python implementation because I\'ll have to do it in C++

Answer 1

use cv::subtract() method.

Mat img1=some_img;
Mat img2=some_img;

Mat dest;

cv::subtract(img1,img2,dest); 

This performs elementwise subtract of (img1-img2). you can find more details about it http://docs.opencv.org/modules/core/doc/operations_on_arrays.html