Different results when changing the input order of image pair

[Beniko95J]

Hi, I am trying to use LoFTR in my own project, while I find that I get different matching results when changing the input order of image pair. Is this behavior expected?

Thanks, beniko

[zehongs]

Yes.

[Beniko95J]

So can I think the matching results of LoFTR as sparse optical flow, and something like forward-backward consistency check can be applied to obtain better results?

[zehongs]

The inconsistency is due to the coarse-to-fine design. One easy-to-implement method is to do bi-directional matching and take the union of the predicted matches.

[ynma-hanvo]

any suggesting on how to tracking features on a sequence of images