sift implementation matlab

Question

ans me if any one knows.

matlab imlpementation of David Lowe's paper on this link

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

the function is like this.

[image, descriptors, locs] = sift(image1);

i just want to know about parameter "locs".is it returns the location of descritor as [x y scale orientation] ?????

if it gives location than x and y must be a whole number.but it gives values in points.

Answer 1

SIFT uses subpixel accuracy when locating the keypoint. This can be seen in Section 4 Lowe's 2004 SIFT paper.

Answer 2

off course i did.

Answer 3

http://www.vlfeat.org/~vedaldi/code/sift.html