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Author Topic: How to calibrate a UAV camera in Metashape 1.5.1!!!  (Read 8378 times)

tymal77

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How to calibrate a UAV camera in Metashape 1.5.1!!!
« on: March 15, 2019, 12:56:08 PM »
Hi all

I know there is a camera calibration utility within the software which used to be in Lens.

I can see the checkerboard pattern and the calibration option, does anyone have a pdf document with a good method / workflow in how to calibrate a camera lens before running jobs through it ?

I am looking for a workflow I can use for all our UAV cameras - also do you tick every option box - as im unsure what the different parameters are such as p1 to p4, etc
« Last Edit: May 28, 2019, 06:48:17 PM by Alexey Pasumansky »

nj

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Re: How to calibrate a UAV camera in Metashape 1.5.1!!!
« Reply #1 on: March 17, 2019, 03:43:58 PM »
try this workflow https://de.mathworks.com/help/vision/ug/single-camera-calibrator-app.html … i use it for every lens …concerning color … there is a bunch of LUTs out there for any camera you own.
regards nj

Lumuss

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Re: How to calibrate a UAV camera in Metashape 1.5.1!!!
« Reply #2 on: May 27, 2019, 08:12:33 AM »
Hello,

I've been using a ChArUco board. Which actually lets Metashape complete the photo alignment process on the image sets I gather on the board. You may also want to check this tutorial - https://docs.opencv.org/3.1.0/df/d4a/tutorial_charuco_detection.html

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Lumuss

LFSantosgeo

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Re: How to calibrate a UAV camera in Metashape 1.5.1!!!
« Reply #3 on: July 03, 2019, 09:33:19 PM »
try this workflow https://de.mathworks.com/help/vision/ug/single-camera-calibrator-app.html … i use it for every lens …concerning color … there is a bunch of LUTs out there for any camera you own.
regards nj

From the workflow above it states: "Capture the images of the pattern at a distance roughly equal to the distance from your camera to the objects of interest." Following this statement unables to use it with UAV images since UAV/camera distance to objects or area of interest might vary from 20 to 120m of distance (or even more).

Some posts say that is good to use precalibration since it might avoid errors on reconstructed points (like doming). Considering this I guess the calibration is necessary even though quite difficult to perform the same distance photography of the checkboard using UAV.

1. Does it matter to calibrate the camera with the same distance from camera to imaging object?
2. Can I get initial values for camera calibration (using Lens) and then use self-calibration afterwards to refine the parameters values when processing aerial data? (I got the impression that this is viable from the Metashape manual).
Luiz Fernando