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Author Topic: Camera Calibration using Mavic 2 Pro  (Read 791 times)

nagalakshmi

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Camera Calibration using Mavic 2 Pro
« on: March 13, 2020, 03:13:26 PM »
Dear Support

We are facing trouble in Aligning dataset captured using Mavic 2 pro.
Following are the options we used for aligning the dataset.
1. Camera calibration using the auto option
2. Camera calibration using Auto option with rolling shutter enabled.
3. Camera calibration using pre calibration.

Alexey Pasumansky

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Re: Camera Calibration using Mavic 2 Pro
« Reply #1 on: March 13, 2020, 05:37:18 PM »
Hello nagalakshmi,

It would be helpful, if you could share the sample dataset and some visual description of the problem (screenshots or the project saved after alignment) to support@agisoft.com, as currently there's no sufficient information regarding the troubles that you are facing.
Best regards,
Alexey Pasumansky,
AgiSoft LLC

Alexey Pasumansky

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Re: Camera Calibration using Mavic 2 Pro
« Reply #2 on: March 16, 2020, 08:25:31 PM »
Hello nagalakshmi,

Thank you for sending the report files. In all the cases the estimated values for Cx and Cy (principle point location) are quite off (also B1 and B2 values are unreasonable).

The values in GUI (Metashape 1.6) for Cx and Cy represent the offset from the image center, while in you XML it is estimated from top-right corner of the image.
The autocalibration of the parameters may also lead to the incorrect Cx, Cy, B1 and B2 parameters estimation, if the camera is mounted on gimbal and has always the same orientation in global space, regardless of the flight direction. For more accurate and stable autocalibration results it is suggested to have the camera 180 degree rotated in the end of flight lines, as it gives more information to the algorithms.

Meanwhile, for the current project I can suggest to skip loading of the XML file, fix Cx, Cy, B1 and B2 parameters in the Camera Calibration dialog. Then run Align Photos operation with "adaptive camera model fitting" option disabled. Also I recommend to use 1.6.2 version.
Best regards,
Alexey Pasumansky,
AgiSoft LLC

Davidedts

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Re: Camera Calibration using Mavic 2 Pro
« Reply #3 on: June 29, 2020, 09:37:02 AM »
HI

I have a question related to the same topic.
I have a Mavic 2 pro and Agisoft standard and i am trying to follow the process to get a 3D model of a field.
When i start to allign the pictures all the time i get the same strange result.
The shape of the field is curved.
Mavic 2 suffer of rolling shutter and so i tried to activate the rolling shutter compensation in camera allignement but the result is worse.
I attach some screenshot.
Someone can help me to have a right setup for this drone?

thanks a lot



Alexey Pasumansky

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Re: Camera Calibration using Mavic 2 Pro
« Reply #4 on: June 30, 2020, 02:45:33 PM »
Hello Davidedts,

Can you please also provide the screenshot of the model view with the enabled camera locations and of the Adjusted values tab from the Camera Calibration dialog?
Best regards,
Alexey Pasumansky,
AgiSoft LLC