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D415 RGB and IR spots pattern illumination cross talk. White Strobed/Pulsed illumination/lighting?

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Alessio Stella
  • Edited

Dear all

I noticed in an application a slight cross talk between RGB image and IR spot pattern illumination. I mean that in the RGB image i see many small coloured spots (mainly blue).

Is that by chance because the RGB sensor is actually sensitive also in the IR band? Is it possible to have a sensitivity curve (three curves) of the RGB sensor? In that application there is not very powerful artificial illumination/lighting, so probably this effect would decrease if the white illumination was increased.

I guess that to increase that power it is not feasible to use pulsed/strobed illumination/lighting in sync with the D415 because te shutter is rolling?

Thank you very much

Kind Regards

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4 comments

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  • MartyX Grover
    • Edited

    Hi Alessio Stella  It is a known, though rarely occurring, phenomenon that the infrared dot pattern projection can leak through to the RGB image.  A method for addressing it is to reduce the Laser Power value, as laser power has a direct relationship with dot visibility.  For example, if Laser Power is maximized at '360' then try reducing it to its default value of '150'.

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  • Alessio Stella

    Thank you for your prompt answer. I wouldn't do that because it would affect the 3D image quality.

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  • MartyX Grover

    Do you see improvement if you apply the Hole Filling Filter post-processing filter please?

     

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  • Alessio Stella

    Thank you for the suggestion, I will try that when I can (not immediately as now I am working offline on saved data)

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