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| 2017-05-22 06:01:17 -0600 | commented question | Keypoints in very small images Alright, that's what i feared. I already worked without alpha channel, but the results weren't any better. But, knowing that keypoints are a dead end, I feel better putting effort into t. matching - thanks. |
| 2017-05-19 09:26:33 -0600 | asked a question | Keypoints in very small images 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? |