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would like to know the answer to the following question regarding SIFT if anyone knows.

Before I start, I refer you to the implementation of David Lowe's paper through this link:

http://www.cs.ubc.ca/~lowe/keypoints/

The function declaration looks like this:

[image, descriptors, locs] = sift(img);

The variable locs return [x y scale orientation], I want to know that the "scale" is the magnitude of the keypoint (x,y) with orientation?

Aadnan Farooq A
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1 Answers1

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Yeh. From the readme file of this release:

% locs: K-by-4 matrix, in which each row has the 4 values for a
% keypoint location (row, column, scale, orientation). The
% orientation is in the range [-PI, PI] radians.

ezfn
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