Keypoint Scale for HPatches?

[xushangnjlh]

Thank you for sharing this wonderful work! I am testing your results on HPatches, however I am not sure which keypoint scale (sampling window) you utilized when testing BEBLID descriptor. I noticed that you have mentioned a recommended scale for different keypoint (so I set 6.75 for hpatches). But the resulting matching mAP is only 0.13.

So what are the scale settings for you when evaluating on hpatches? Thanks in advance!

[iago-suarez]

Hi,

I assume that you are using the OpenCV Python version and that you are using pre-cropped patches. Is this right?

If so, for the 32x32 patches, the keypoint should be centered in the point (16, 16) and the scale=1.0. This is what we have tested in the paper. If you use patches of size 64x64 then the center should be (32, 32) and the scale=2.0. I hope this is helpful for you. If you are not able to reproduce the results and can send you a small example, but I'm not sure when I'll have time to do it.

[xushangnjlh]

It would be great if you can send me the example ([email protected]). As for HPatches, default patch size is 65x65 and when I set keypoint scale to 2.0, the results get even worse and I cannot figure out why ... Thanks and take your time~

[iago-suarez]

Okey, I'll try to do it this weekend! I will also publish it here because I think is beneficial for the community.

Best, Iago.