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Author Topic: Aligned camera vs actual photo  (Read 1522 times)

JJ

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Aligned camera vs actual photo
« on: October 10, 2022, 08:54:36 PM »
trying to develop a workflow where i take a few photos in succession, including my 'hero' shots, then align in MS and generate a rough model which will only act as reference, and possibly as hidden geometry that will cast shadows on the the photo backplate

i took 22 shots of this shop facade.  in MS i aligned the photos (high setting) and then optimised.  once optimised i generated a model from depth maps (high setting, high poly)

i then exported an FBX (with cameras) and opened in MODO.  in MODO i view the scene through one of the cameras and compare to the original photo.  as you can see the result is good but not perfect (if you flick between the 2 images you will see that the alignment is good, but the position is slightly off

the sensor sized was matched in MODO, as was the focal length.  render resolution was matched to the size of the original photo

i've only tried one camera view so far, but will check a couple of others

how accurate can i expect alignment to be?

are there any other settings i should check?

in general will generated models viewed through aligned cameras match original photos?


JJ

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Re: Aligned camera vs actual photo
« Reply #1 on: October 12, 2022, 10:18:23 AM »
anyone from Agisoft care to comment?

does my question not make sense?

Alexey Pasumansky

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Re: Aligned camera vs actual photo
« Reply #2 on: October 12, 2022, 12:33:34 PM »
Hello JJ,

I think that you should try using undistorted images with the exported FBX instead of original images.
Best regards,
Alexey Pasumansky,
Agisoft LLC

JJ

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Re: Aligned camera vs actual photo
« Reply #3 on: October 16, 2022, 11:12:06 AM »
thanks Alexey - so you mean that the original images may be distorted and that's why they don't quite match?

i use a micro four thirds system which fixes distortion automatically in Lightroom when the RAWs are imported.  there is no way to disable this in LR so the exported jpegs will always be adjusted for distortion - could this affect the results?