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TMS320DM368: BLC tuning in DM368

Ansu Mathew
Prodigy 150 points

Part Number: TMS320DM368

Hi,

 We are developing a camera using the DM368 DaVinci Video Processor and AR0330 sensor. The software platform used is IPNC RDK 5.1. We need to fine tune BLC for the better video quality under bright light condition.  We have three BLC levels(Low, Medium and High), but these levels are not giving that much performance.  Also not able to identify any changes between these levels.  We are only updating AE weighting table for BLC. Please check the attached images for reference.

In this picture there is a person under that bright light source, but his face is not visible.

In this picture also faces are not clear. Also bright light is coming from the windows.

I think BLC tuning may solve this issue. Please help me on this.

Also how to solve that bright light coming from the windows.

  • 0
    Genius 4030 points
    Hi,
    I will inform IPNC team to look into this issue.
    Meanwhile you can search for similar e2e threads.

    Regards,
    Anuj
    PathPartner Technology Pvt Ltd
  • 0
    Intellectual 260 points
    Hi,

    Basically gALG_aewbObj.weight is set based on BLC modes. If you are not seeing any difference in brightness between all three modes (even for backlit scenes), you can just verify weight table is being set when you change the mode.

    If the implementation is proper, next step would be customizing the weight tables (TI_WEIGHTING_MATRIX, TI_WEIGHTING_SPOT and TI_WEIGHTING_CENTER). You can give higher weights for the blocks (regions) you wants to have more weightage for AE calculation. It is a balancing act. If there is no weightage for very bright regions, those regions will be completely saturated. Or if the weightage is too high , rest of the regions will be very dark.

    Usually weight matrix will be 16*32 values, 16 blocks in horizontal direction and 32 blocks in vertical direction.

    Best Regards
    Nithin Varghese