OpenCV Keypoints response, greater or less?

Question

According to OpenCV KeyPoint documentation, there is response field in every keypoints that:

float response: The response, by which the strongest keypoints have been selected.

But I couldn't find whether the greater response is better or less? I want to sort the keypoints and pick only the best 20.

Answer 1

Here, response is indeed an indicator of "how good" (roughly speaking, in terms of corner-ness) a point is. The higher, the better. The strongest keypoints means the ones that are the best.

You can check out this thread for more info and examples.