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Author Topic: Ortho mosaic, Image artefacts on joins/overlaps  (Read 2135 times)

jmos

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Ortho mosaic, Image artefacts on joins/overlaps
« on: October 29, 2015, 08:59:28 AM »
Hi, I have just trialled Agisoft and created a number of ortho mosaics.
On some of the mosaics I have these image artefacts, seem to be on joins/overlaps.

Other mosaics seem perfect, seamless, all processed the same way?
Any suggestions would be appreciated.
I found the following topic, perhaps this is related, my trial version has ended.
http://www.agisoft.com/forum/index.php?topic=2778.0
(The real solution is to ground classify your dense point cloud and use a mesh from the ground points when generating your orthomosaic)

Regards
John

jmos

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Re: Ortho mosaic, Image artefacts on joins/overlaps
« Reply #1 on: October 30, 2015, 04:50:37 AM »
Email from Agisoft support, thankyou.

Dear John,

According to the report file the overlap between the images is quite low and it may cause alignment issues that results in the dense cloud and mesh generation artifacts, and therefore will affect the final orthomosaic.
Actually, you can see that the lines of low overlap are visible on the last page of the report.
The recommended values of the overlap are 80% of forward overlap and 60% of side overlap.

Additionally, the problems may be related to the large polygons in the model, if quite low face count is parameter is specified.


Best regards,
Agisoft Team.