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Does the IR data I obtained from Realsense D415 contain visible brand information?

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Chen2 22

Hi there,
Currently I was trying to use the D415 IR data for Face anti-spoofing. I noticed that the depth module actually is consist of two imager without IR filter. This means the left imager can provied IR data.

What I'm curious about is that:
Does the IR data I obtained contain information from the visible brand?

Since the left imager can also return the RGB data.
Does the IR data is generated simply by RGB2GRAY using the RGB data from left imager?
or just extract the red channel of RGB data from left imager as IR data?

From the datasheet, we know that left imager don't have a IR filter, but
is there any special design on its bayer filter?
Does the left imager using the RGGB or some special designed bayer filter like RGBI(infrared)?

Thank you very much!
 
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  • MartyG
    • Edited

    hi Chen2 22  The infrared image does not use data from the RGB color sensor.  The left sensor is capable of outputting an RGB image from the left infrared imager on certain RealSense camera models (D405, D415, D455) but that is a separate mode from the infrared image.

     

    Although the infrared image resembles a gray RGB image, it is not RGB format.  By default it is Y8 format. 

     

    The left and right imagers can provide an infrared image.  Depth frames are constructed using images from both infrared imagers, which is why D415 is called a 'stereo' depth camera.

     

    The link below advises that the D415 has a Bayer pattern filter to extract color but it does not block infrared.

    https://github.com/IntelRealSense/librealsense/issues/1070#issuecomment-366405803

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