White space in images

[Ben Plotnick]

I notice that white space in images tends to really screw with my feature matching due to the match of small scale reference patches.  Is there a good way to deal with it? Should I simply hardcode something to ignore these cases?

-Ben

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Ben Plotnick
University of Pennsylvania
M.S.E Electrical Engineering | May 2012
bplo...@seas.upenn.edu

[Andrew Yeager]

I think that depends somewhat on your implementation and what's causing the matches.  You could consider removing descriptors that contain only whitespace from consideration, this would be similar to sampling near edges.  Depending on the specifics of your code there might be other options as well.    How well are the patches actually matching to the whitespace and are the patches in the reference image that are matching also white space?  Along the lines of the 2 nearest neighbor comparison in the feature matching on the last assignment, higher values in a vote map might indicate that no matches really stood out at that scale rather than lots of good matches.  Also something to possibly consider is that if you're comparing votes from different scales by scaling the reference image, then the number of votes on a correct match is expected to decrease as the scale gets smaller since there are fewer descriptors describing it.

Andrew

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