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    VOXL 2 Stereo Calibration

    VOXL 2
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    • B
      bendraper
      last edited by 21 Nov 2022, 20:19

      Hi all,

      Trying to do a stereo camera calibration on a VOXL 2 and getting pretty large re-projection errors when calibrating the extrinsics but okay error for the individual cameras. Followed the documentation for calibrating the cameras and sifted through the forums but can't seem to find a solution to this. Is there a step to calibrating that isn't specified in the documentation? or is there a best practice for doing these calibrations? Thanks!

      f87d5bbe-8fb2-4812-8cb5-6546d299bc2f-image.png

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      • B
        bendraper
        last edited by 21 Nov 2022, 20:40

        the actual distance between cameras is about 0.0857 but that is not what it is calculating

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        • M
          modaltb ModalAI Team
          last edited by 3 Jan 2023, 20:01

          @bendraper ,

          Sorry for the lag here, I'm cleaning up open topics and saw this message a bit late.... Any progress on this issue?

          B 1 Reply Last reply 5 Jan 2023, 19:50 Reply Quote 0
          • B
            bendraper @modaltb
            last edited by 5 Jan 2023, 19:50

            @modaltb No problem! I think I'm getting close. Im pretty consistently getting a reprojection error ~0.6 at this point so still have yet to successfully calibrate stereo extrinsics. Tried new stereo cams, refocusing, different lighting, different scales of checkerboards, but can't get sub 0.5

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            • C
              Cheng Sheng Weng
              last edited by 6 Jan 2023, 06:54

              I also have the same problem.

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              • B
                bendraper
                last edited by 6 Jan 2023, 16:25

                Lol today it decided to finally work. error 0.39

                A 1 Reply Last reply 6 Jan 2023, 17:19 Reply Quote 0
                • A
                  Adrian Hidalgo ModalAI Team @bendraper
                  last edited by 6 Jan 2023, 17:19

                  @bendraper Curious to know if some factors changed from the last time you got the large errors

                  B 1 Reply Last reply 6 Jan 2023, 18:25 Reply Quote 0
                  • B
                    bendraper @Adrian Hidalgo
                    last edited by 6 Jan 2023, 18:25

                    @Adrian-Hidalgo I redesigned the mounting piece for the cameras, used new refocused cameras, and fixed some errors in my general camera extrinsics file (although I'm not sure that last one is related)

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