Manta Matcher: automated photographic identification of manta rays using keypoint features.

As features at a very fine scale are less likely to be significant, we ignore features with a very low scale (a scale-space value of 1.1 was empirically selected as a good cut-off) and weight the contribution (see w n above) of matching keypoint pairs based on their absolute and relative scales: where f i ∈ F i and f j ∈ F j are the candidate features in images I and J , is their mean scale, and a value of P = 0.10 yielded best results on an evaluation set.

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