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sift extract keypoints

asked 2013-03-11 02:28:11 -0500

marwa allam gravatar image

updated 2013-03-11 02:30:21 -0500

i want to know how sift extract keypoints from image? or how these lines work?

% Call keypoints executable
if isunix
   command = '!./sift ';
else
   command = '!siftWin32 ';%this on
end
command = [command ' <tmp.pgm >tmp.key'];
eval(command);%fill data of tmp.pgm in tmp.key
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answered 2013-03-11 10:50:47 -0500

Please be so kind to read through this paper: http://www.cs.ubc.ca/~lowe/papers/ijcv04.pdf

It is the original paper by David Löwe describing the principle behind SIFT features. It will show you what actually happens.

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Asked: 2013-03-11 02:28:11 -0500

Seen: 492 times

Last updated: Mar 11 '13