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non-aligned optical axis & effect on Stereo Calibration

asked 2016-11-07 10:41:54 -0500

noveguy gravatar image

hi all,

Because of assembly fault, one of my camera on my stereo rig has its optical axis non-parallel vertically with other camera. My stereo rig is horizontally oriented. AFAIK, rectification process could align frames from these 2 cameras. Is it true ? Is there anything I should be cautious about ? Could I still use it to generate depth map ?

Thanks,

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answered 2016-11-29 08:33:06 -0500

JayneDoe gravatar image

Bit late with my answer, but anyway:

StereoCalibrate calculates the transforms necessary to create horizontally or vertically aligned images. If your horizontal setup has a (slight) vertical misalignment, you get rectified images which do not completely overlap vertically: from one image a bit from the top is cut of, from the other a bit from the bottom.

As long as you have enough overlap for your application, the resulting stereo reconstruction should work fine, only with a reduced working volume.

I am actually working with a ZED camera right now, which has a vertical difference of about 10 pixels of 720, and it works OK when calibrated.

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Thanks Jay,

Could you estimate how large the overlapping area is enough for accurately estimation ? In my application, the overlapping area took about 50% of each image (3280x2464)

noveguy gravatar imagenoveguy ( 2017-02-20 08:36:07 -0500 )edit
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Asked: 2016-11-07 10:41:54 -0500

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Last updated: Nov 29 '16