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AM62A7: The picture tone is a bit green

meng Ke
Intellectual 940 points
Part Number: AM62A7

Tool/software:

Hi ,Ti Experts

I've completed BLC, WDR, and AWB, and the current tint has a greenish cast, especially in the shadows.

I tried changing the BLC from -64 to -56, which improved it slightly, but the image became a bit pale.

Changing the BLC from -64 to -72 reduced the paleness, but the green was more pronounced.

How can I address this green cast while reducing the paleness?

By the way, can these parameters help solve this problem?

I tried modifying them, but it didn't work

Best Regards

Meng

  • 0
    TI__Guru 59380 points

    Hi meng,

    meng Ke said:

    I've completed BLC, WDR, and AWB, and the current tint has a greenish cast, especially in the shadows.

    You shall not change BL as it is a known and fixed value for most sensors.

    Please share some sample raw/yuv images (along with comanding knee points) and your AWB calibration xml.

  • 0 in reply to Gang Hua
    Intellectual 940 points

    Hi Gang

    Here are my pic and xml

    AWB_Files.rar

    Best Regards

    Meng

  • 0 in reply to meng Ke
    TI__Guru 59380 points

    Hi meng,

    Your AWB calibration output does not look good.

    Please follow "7.6.2 Tuning AWB" in the app note in the link below carefully.

    https://www.ti.com/lit/pdf/sprad86

  • 0 in reply to Gang Hua
    Intellectual 940 points

    Hi Gang

    According to the manual, I performed the following AWB tuning:
    1: Using the DCC tool, I captured photos of the color chart under D50, TL84, D65, and A lighting.
    2: Loaded the photos in the Reference Files section, set the color temperature and black level, and used the Macbeth chart selector to click the four corners of the color chart clockwise.
    3: Loaded the HDR Decompading Knee Points file.
    4: Run the plugin.
    Are there any steps that need improvement?

    Best Regards

    Meng

  • 0 in reply to meng Ke
    TI__Guru 59380 points

    Hi meng,

    Please go through AWB plugin guide carefully especially "1.3 Input files".

    I suspect that you might have not entered the black level correctly.

  • 0 in reply to Gang Hua
    Intellectual 940 points

    Hi Guang Hua

    I've set the color temperature and black level for each image in the AWB process.
    My AWB appears to be working (a red screen in front of the camera doesn't have a bluish tint on the white wall behind it).
    I suspect the issue may be with the CFAI+WDR process (my workflow is BLC -> CFAI+WDR -> AWB -> ColorCorrection).

    here is my cfai config params

    I tried to change CFAI bandwidth green(High Low Mid), but seemed not work

    Do I need to change CCM gain?

    Best Regards

    Meng

  • 0 in reply to meng Ke
    TI__Guru 59380 points
    meng Ke said:
    My AWB appears to be working (a red screen in front of the camera doesn't have a bluish tint on the white wall behind it).

    This sounds good and AWB seems working.

    meng Ke said:
    I suspect the issue may be with the CFAI+WDR process (my workflow is BLC -> CFAI+WDR -> AWB -> ColorCorrection).

    What issue are you referring to?