Rejected stereo image pairs in Stereo Camera Calibrator App

Hello all,

I’m trying to use the “Stereo Camera Calibrator App”.

I’m trying to import four pairs of images, but it only accepts one pair and rejects the other three. I followed the advice from the camera preparation page, but it didn’t do any good. I have no clue why it rejects most of the image pairs.

Please see the attached four images of each camera (left and right). The checkerboard size is 3 mm.

Thank you.

Answer 1

[Saurabh]

Hi Elad,

It appears that you are trying to calibrate stereo image pairs, but while some images are being successfully added, others are being rejected.

There can be many reasons why the images are getting rejected:

• The calibrator rejects duplicate images.
• It also rejects images where the entire pattern could not be detected.
• Possible reasons for no detection are a blurry image or an extreme angle of the pattern.
• Detection takes longer with larger images and patterns that contain many squares.

The same information can be found here:

https://www.mathworks.com/help/vision/ug/using-the-stereo-camera-calibrator-app.html?searchHighlight=Rejected%20Stereo%20Pairs&s_tid=srchtitle_support_results_1_Rejected%20Stereo%20Pairs#

Take a look at the points above and see if any of them might be the problem.

I hope this was helpful.

[Elad]

Thank you for answering. It wasn't so helpful though.

I figured it out eventually. It appears that it looks for the same size checkerboard in all images. Moreover, it is better if the checkerboard doesn't cover the entire frame.