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Yannis Mantzouratos

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18 Mar 2012 OpenSURF (including Image Warp) SURF (Speeded Up Robust Features) image feature point detection / matching, as in SIFT Author: Dirk-Jan Kroon

Hi all.

Dirk-Jan, thanks very much for your work on this. It was very useful for me, but I would like to point out a design flaw I encountered. In case someone just needs to use U-Surf (the upright version of surf), you still compute the orientation of each point prior to producing the descriptor, although it is not needed at all - and the computational overhead is somewhat significant.

So, I would suggest the following change to whoever is interested.

In file SubFunctions/SurfDescriptor_DescribeInterestPoints at line 32, I changed

ip.orientation=SurfDescriptor_GetOrientation(ip,img,verbose);

to

if ~upright ip.orientation=SurfDescriptor_GetOrientation(ip,img,verbose);
ipts(i).orientation=ip.orientation;
end

and then I also removed

ipts(i).orientation=ip.orientation;

from line 38.

Best,
y

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