I want to find a very small image (20x20px) within a small image (~400x250) using OpenCV. Here is an example:
The problem is as follows: I can't use template matching because of partial obstruction and sub-pixel rendering on the bigger image (which is rendered in-game and leads to 1-2 pixels difference.) However, keypoint extraction seems to fail with most methods, because the input image is very small (20x20px colored within a 32x32 template.) Simply increasing the 20px image in size did not really work.
Currently, I am out of ideas, although the task seems simple enough. Is there an algorithm within OpenCV that suits this problem?
