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Author Topic: Point Filtering (residual values)  (Read 1897 times)

indesinenter

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Point Filtering (residual values)
« on: September 20, 2019, 04:55:04 PM »
Hi!

I've been looking at the forum, but I do not find any similar topic. Is there any option to filter the points for their residual value? It is a parameter that is calculated in the alignment proces and it would be nice be able to eliminate all values ​​that have high residual values. In order to decrease reprojection errors.

For example (I attach a screenshot), I would be interested in eliminating the point that has a very high residual value compared to the others.

Thanks
« Last Edit: September 20, 2019, 04:56:37 PM by indesinenter »

Alexey Pasumansky

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Re: Point Filtering (residual values)
« Reply #1 on: September 20, 2019, 08:27:28 PM »
Hello indesinenter,

You can try to use Model View -> Gradual Selection -> Reprojection error option while in the sparse cloud view mode in order to select (and then remove) the tie points with the highest reprojection error.
Best regards,
Alexey Pasumansky,
Agisoft LLC

indesinenter

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Re: Point Filtering (residual values)
« Reply #2 on: September 22, 2019, 01:57:29 PM »
Thanks Alexey for your reply.

And the level parameter is the reprojection error for each point?

I suppose that the elimination of "bad" points (for example, higher than the level: 0.5) increases the quality of the camera calibration? And does the Dense Point Cloud have better geometry/quality?

Thanks