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Author Topic: Mask all 50 photos? Really?  (Read 6662 times)

Shopgeezer

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Mask all 50 photos? Really?
« on: November 16, 2018, 12:25:32 AM »
So my reading on photogrammetry stresses the need to put movement in the photo to create parallax in the background that the software can use for alignment. But the Photoscan tutorial says that a model has to be masked to eliminated the background.  Using manual tools like Bezier curves and arc tools on every photo?  No way you can get them all identical.  What if you have 500 photos?  I am interested in making models for 3D printing.  Can you use a green screen behind your original on a turntable and get the software to eliminate the background?  A Manual masking of hundreds of photos would be ridiculously difficult.


Alexey Pasumansky

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Re: Mask all 50 photos? Really?
« Reply #1 on: November 16, 2018, 12:48:50 PM »
Hello Shopgeezer,

You can check the masking from background tool (if you are using static cameras and turntable scenario), the following video is quite informative for such case:
https://www.youtube.com/watch?v=9_F-b2hxP_o

In case the camera positions may vary, but still the images are taken against some static background similar for all the images, you can try to use the background suppression alignment method that is described in the related tutorial:
http://www.agisoft.com/index.php?id=49
After aligning the images this way you can generate rough mesh model from the sparse cloud and generate the masks from the model, in case they are necessary for the dense cloud and texture generation.
Best regards,
Alexey Pasumansky,
Agisoft LLC