best-matches

best-matches

asked 2012-09-21 09:47:47 -0600

Rakefetmoor
21 ●1 ●1 ●3

I found matches between two images using BruteForceMatcher and knnMatch. The features in each image were generated by SURF or BRISK. I filtered out some of the matches by using the ratio test of the distances between the test feature and the second nearest neighbor. What I want to do is draw the matches between the two images so I can see if the points are indeed match. The problem is that I have way too many matches points (~2000). The features are not on a flat surface so I can not use getHomography to filter out the outliers. Is there a way to find the best N matches?

Thanks,

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answered 2012-09-24 01:41:35 -0600

Jacek

306 ●1 ●7

To filter out incorrect your matches you can use epipolar constraint. Use findFundamentalMat function with FM_RANSAC estimation method to estimate fundamental matrix based on matching points from 2 images. RANSAC can deal with situation when you have many outliers.

The function returs estimated fundamental matrix and a vector indicating which pair of matching points is inlier and which is outlier.