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qian256 / HoloLensARToolKit

Marker tracking using the front-facing camera of HoloLens (both 1 and 2) and Unity, with a wrapper of ARToolKit built for UWP (Windows Universal Platform)
GNU Lesser General Public License v3.0
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The tracking error is relevant to the distance between marker and divice. #53

Open Bornblack opened 4 years ago

Bornblack commented 4 years ago

I have done the HoloLensCamCalib for better alignment . But actually the alignment error is not stationary , as the error gets bigger when I put marker away from the divice . Is there a optimal working distance for HoloLensARToolkit ？ Or Do I miss somthing else？

qian256 commented 4 years ago

Which device are you using, HL1 or HL2? Did you print the marker to be exact size as specified in the scene?

Bornblack commented 4 years ago

Thanks for your reply ! My device is HL 2, and I try the HL2ARToolKitSingle sample , the size of the marker I print is 4cm (a 4x4 cm marker in A4 paper) . I guess the problem is not the size of the marker. In your code, The position of the virtual object = TransMatrix X LocatableCameraToWorld X CalibrationMatirx I think it is the inaccuracy camera parameters I calibrate cause this magnifying error , as the error gets larger when the distance is increasing between HL2 and marker . Maybe I need to calibrate my HL2 again for accuracy camera parameters. By the way , I am a little confused about the Boader Size . As for the cube sample , the size of the cube I make is 6 cm , same as the virtual cube . And the size of the marker at the center of each face is 4 cm , so I have to change the Border Size parameter to 2/6 , right ?