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  4. VOXL 2 Stereo Calibration

VOXL 2 Stereo Calibration

Scheduled Pinned Locked Moved VOXL 2
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  • B Offline
    B Offline
    bendraper
    Regular
    wrote on last edited by
    #1

    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 Offline
      B Offline
      bendraper
      Regular
      wrote on last edited by
      #2

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

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      • modaltbM Offline
        modaltbM Offline
        modaltb
        ModalAI Team
        wrote on last edited by
        #3

        @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
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        • modaltbM modaltb

          @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 Offline
          B Offline
          bendraper
          Regular
          wrote on last edited by
          #4

          @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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          • Cheng Sheng WengC Offline
            Cheng Sheng WengC Offline
            Cheng Sheng Weng
            wrote on last edited by
            #5

            I also have the same problem.

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            • B Offline
              B Offline
              bendraper
              Regular
              wrote on last edited by
              #6

              Lol today it decided to finally work. error 0.39

              Adrian HidalgoA 1 Reply Last reply
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              • B bendraper

                Lol today it decided to finally work. error 0.39

                Adrian HidalgoA Offline
                Adrian HidalgoA Offline
                Adrian Hidalgo
                ModalAI Team
                wrote on last edited by
                #7

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

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                • Adrian HidalgoA Adrian Hidalgo

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

                  B Offline
                  B Offline
                  bendraper
                  Regular
                  wrote on last edited by
                  #8

                  @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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