Regarding Standard Oxford Format for vlfeat sift

Posted by Karl on Stack Overflow See other posts from Stack Overflow or by Karl
Published on 2012-11-22T16:58:42Z Indexed on 2012/11/22 16:59 UTC
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computer-vision

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standards

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sift

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vlfeat

One of my upper classmen has gave me a data set for experimenting with vlfeat's SIFT, however, her extracted SIFT data for the frame part contains 5 dimensions. Recall from vl_sift function:

[F,D] = VL_SIFT(I)

Each column of D is the descriptor of the corresponding frame in F. F normally contains 4 dimensions which consists of x-coordinate, y-coordinate, scale, and orientation.

So I asked her what is this 5th dimension, and she pointed me to search for "standard oxford format" for sift feature.

The thing is I tried to search around regarding this standard oxford format and sift feature, but I got no luck in finding it at all. If somebody knows regarding this, could you please point me to the right direction?

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