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Author Topic: Interior camera calibration based on single image and many GCPs  (Read 1023 times)

an19879311

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Dear Metashape users,
We have a monoplotting (i.e. single view) setup and we are interested in retrieving the interior camera parameters for further usage.
We have many Ground Control Points for this single image/view and the accurate real-world (i.e. exterior) camera position.

Is it possible to obtain the interior camera calibration with this setup?
And will this be possible using Agisoft Metashape?
I have successfully imported the single image, marker positions, exterior camera position of this image and marker coordinates. Is there a way to run a camera optimization for the interior parameters with this setup?

Kind regards

DayGeckoArt

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Re: Interior camera calibration based on single image and many GCPs
« Reply #1 on: August 01, 2022, 04:23:07 AM »
Yes, I would mark the control points in every photo they appear in, then optimize or run a new camera alignment. Then save the camera calibration to CSV file and you can load it in later projects. When you run the photo align, the Agisoft uses that calibration data but will also adjust it for the new new project

an19879311

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Re: Interior camera calibration based on single image and many GCPs
« Reply #2 on: August 18, 2022, 01:27:46 PM »
Thank you for your answer.
Maybe my question wasn't well formulated: We do not have many pictures, but only one single picture, plus exact camera position and many ground control points. We are not necessarily interested in a 3D reconstruction of the scene for now, but rather in retrieving the camera calibration.
As described, I have successfully imported the picture, set the ground control points. But "align photos" or "optimize cameras" is greyed out, i.e. cannot be run.
As I've said, for now we would like to retrieve camera calibration. I know this is probably not what most users want to achieve, but maybe someone has an idea or hint, how this could be achieved using metashape?
(A regular camera calibration cannot be performed, these are remote webcams and cannot be accessed or removed)

Paulo

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Re: Interior camera calibration based on single image and many GCPs
« Reply #3 on: August 18, 2022, 07:27:28 PM »
Hello,

there are certainly methods or algorithms that deal with single image calibration. For example see https://www.sciencedirect.com/science/article/pii/S0263224118307243 but I doubt that these are implemented inside Metashape...
« Last Edit: August 18, 2022, 07:29:34 PM by Paulo »
Best Regards,

Paul Pelletier,
Surveyor