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OPT8241-CDK-EVM: Distance accuracy and other questions...

PANGON KIM
Prodigy 10 points

Part Number: OPT8241-CDK-EVM

Hi team.

We are currently testing the OPT8241-CDK-EVM.

If you look at the product specification, the accuracy is indicated as 1mm, but when we test it with VolxelViewer, 5cm ~ 20cm error will occur.

(The farther the distance is, the more error rate is.)

Do We need more parameter settings in VoxelViewer?

 

Another question will be developed in the scenario below,

Please check if it is possible.

 

* Products to be developed : Finger touch(writting, drawing) application using 3DToF camera.

[scenario]

1. The computer screen is being printed on the whiteboard with the beam project.

2. 3DTof camera and whiteboard distance(3M) are fixed.

3. The hand of the host and the finger for the finger touch are recognizable.

4. Writable and Drawable when finger touches the whiteboard.

   --> When the distance between the finger and the whiteboard is within 5mm, we recognize finger touch.

 

Please review the possibility of development.

 

thank you.

  • 0
    TI__Expert 3800 points
    Hi Pangon,

    Thanks for your interest.
    We see that you have a very specific use case of the relative distance between finger and a white board. 3D ToF cameras would be capable of solving this. Typically, we have seen 3D ToF cameras work well for use cases where there is a lot of uncertainty in the environment.
    For instance, in this case, you would be able to position a 3D ToF camera to measure the 5mm gap. However, a combination of IR projection and IR cameras may yield a solution which will be purpose built and it will be more manageable to calibrate, etc.

    If you want to use the camera for other applications besides just touch sensing, we think this will be a good fit. Sensing 5mm displacement between 2 points with an accuracy of about an mm at 3m distance is possible. It depends on the reflectivity of the finger, reflectivity of the whiteboard, frame rate, etc. I think you will require higher illumination power than the EVM has in its design.

    Regards,
    Subhash
  • 0 in reply to Subhash Chandra Sadhu
    TI__Expert 3800 points
    Hi Pangon,

    I'm closing this thread as there has been no further discussion. Please feel free to reply and we can resume the discussion.

    Regards,
    Subhash