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OPT8241-CDK-EVM: The calibrations needed in my module

JR Choi
Prodigy 80 points

Part Number: OPT8241-CDK-EVM

Hello. I am JR Choi, the engineer of my company.

I have some questions of my OPT8241-CDK-EVM. The module I used should provide accurate depth in millimeters, at least centimeters. My project uses the module capture distance at maximum 450mm.

I started to capture depth frame with my brand-new module. The depth was increased when far from center. So I did Common Phase Calibration and used the calibration result to find out the depth's trend. The trend became less but still remained.

So I decided to do whole calibration of my module. I found out some calibration need some stuff to do the calibration process, in Voxel Viewer Manual.

  • Checkboard pattern image, to print out in A2 paper, used in Lens Calibration.
  • Reflector used in Crosstalk Calibration.

Can I receive that things required in the calibration?

If you need more information, please notify me. My project  will be ending soon, so I want to get a reply as soon as possible.

Thank you.

  • 0
    TI__Expert 3975 points

    Hi JR, 

    What is the accuracy that you want? 

    In your module, you need to do pixel-wise phase offset calibration as well to see uniform depth. This would be sufficient.

    If you still want to do manual calibrationou need to perform the following calibrations for the depth to be correct: 

    • Lens Calibration (this would already be done, just create a new profile with 'Lens Only' as the parent)
    • Non-Linearity Calibration
    • Common Phase offset calibration
    • PixelWise Phase offset calibration
    • Temperature calibration. 

    The checkerboard pattern you need is attached here. You do not need to do crosstalk calibration. cb10x15.pdf

  • 0 in reply to Suramya Gupta
    Prodigy 80 points
    Hi Suramya,

    Thank you for replying. I printed out what you attached, in A2 Size.

    But I am somewhat worried, because of my printing. My printing in A2 sized paper is not normal copier paper. I had to choose one of glossy paper, semi-glossy paper options, not mat paper option. I chose semi-glossy paper.

    Does it make some problem in calibration process? I can not do calibration for a week because of the holiday.

    If I have another problem after a week, I will ask you again.
  • 0 in reply to JR Choi
    TI__Expert 3495 points

    JR,

    Glossy surface can lead to glare and saturation that can lead to invalid calibration.  Best print on A2 matte paper mounted on Styrofoam board for flatness and sturdiness.  

    -Larry