We are using a Sony Alpha 6400 (ILCE-6400) with a sony 18-135mm objective (SEL 18135).
We used a fixed focal length of 18mm during the process.
It seems like we used auto focus during the capturing of the external camera images.
Can this be the reason for the failure of the calibration process (and the reason why the green validation rectangles are missing on the validation images)?
Why is an auto focus not allowed?
I did not mean the car cameras. My question was regarding the external camera you are using for the camera calibration. Can you please tell us the exact model and objective of the external camera you are using for the camera calibration process?
As we still have not been able to successfully complete the camera calibration, I am writing in this forum post again.
In the meantime, we bought the same camera and lens you are using, namely the Sony A6000 with the SEL-20F28 lens, which you specified here:
With this new camera we collected new calibration data.
However, this still did not lead to a successful calibration.
In the following, I will again show the new results we obtained and also provide our data to you and would kindly ask you to check what is wrong with our calibration process.
First, it can be seen in the following image, that the corners of the calibration target can be detected by the calibration tool. But still, as mentioned above, only the blue dots are visible and the green overlay is not:
Further, the validation-intrinsics-<camera>.jpg images again only show the blue points, but the red points and the yellow lines are not visible (which should be visible according to the documentation):
Also, I would like to note that the the json-files of the car cameras, which are generated after the intrinsic calibration (where one needs to record a video of a target moving in front of every car camera), are approximately 400kB ~ 850kB. This file sizes are quite big (for text files) and the files cannot be opened (the PC crashes). Is it normal that these json-files are that big? If not, what could be the reason for this? How big should these files approximately be? How long should the recorded videos be for the intrinsic calibration?
Besides focus, did you make sure you didn’t change any intrinsics during the process (e.g. zoom, images-stabilization)?
Do you have a chance to try on DRIVE OS 5.2.6 and DriveWorks 4.0? DRIVE Software 10 is quite an old release.
Yes, we made sure that we did not change any intrinsics during the process.
We already tried to install DRIVE OS 5.2.6 and DriveWorks 4.0 many times. However, we were not able to successfully update to the new release. For now, we cannot afford to spend more time on trying to update to the new release, but we will try to do so again in the near future. Also, all the other software we developed is already running on DRIVE Software 10.0. The only thing we need to do now is to calibrate the cameras. Besides, we already checked the forum and confirmed that other developers have been able to successfully calibrate the cameras with the DRIVE Software 10.0 release, which should therefore also work in our case.