compare image to images in database

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I have a lot of images and have precomputed histograms for them stored in db, how to fast find best k matches to input image?

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Hello, Which database are you using. I am working on similar project. Help me

dhaval257 (Mar 5 '13)edit

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answered Aug 21 '12

Ilya Lysenkov
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Use the flann module. knnSearch function allows you to find k nearest matches. See docs:

http://docs.opencv.org/modules/flann/doc/flann_fast_approximate_nearest_neighbor_search.html

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not sure how to use this function and I must load all database record in memory? is it suitable not only for interest points matching? how it will compare my histogramms?

mrgloom (Aug 22 '12)edit

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answered Aug 21 '12

imran
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Use the compareHistogram function. See,

http://docs.opencv.org/doc/tutorials/imgproc/histograms/histogram_comparison/histogram_comparison.html

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Yes,I already use this function to compare histograms, but maybe there is a better way than compute each-to-each difference for all records in database?

mrgloom (Aug 22 '12)edit

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compare image to images in database

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compare image to images in database