ransacReprojThreshold?
Hello guys,
I am investigating further into RANSAC with Homography.
One thing i don't fully understand is this formula:
What HsrcPointsi rapresents here?
Hello guys,
I am investigating further into RANSAC with Homography.
One thing i don't fully understand is this formula:
What HsrcPointsi rapresents here?
RANSAC gets as input a set of matches and randomly selects some of them to compute a homography H. It then tests, how many matches 'fit' to this homography. If a match is good enough, it counts as an inlier. This is repeated many times and hopefully, RANSAC will find a homography that has many inliers and thus a good score.
The above formula is the test that defines, whether a match is an inlier or not.
Given a match m(srcPoint, dstPoint)
and a homography H
, m is an outlier, if the distance between dstPoint
and H*srcPoint
(homography applied to srcPoint
) is greater than ransacReprojThreshold
.
initally i wasn't understanding it correctly because on willowgarage the documentation http://opencv.willowgarage.com/documentation/python/camera_calibration_and_3d_reconstruction.html#findhomography reports HsrcPoints (that has no mean) while on opencv.org H * srcPoints that is the correct documentation
Asked: 2012-10-01 06:58:15 -0600
Seen: 5,524 times
Last updated: Oct 02 '12