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AM62A7: The problem of adjusting the sequence of AE and GLBCE

peng qiang
Prodigy 250 points
Part Number: AM62A7

Tool/software:

Hi ti experts

In AM62A, there may be a problem of screen brightness jitter during the process of adjusting screen brightness.

I conducted investigations on AE and GLBCE.

After I closed GLBCE, the issue disappeared.

So I think it's due to the simultaneous regulation of GLBCE and AE.

Is there a way to adjust GLBCE after AE adjustment is completed?

  • 0
    TI__Guru 52315 points

    Hi peng,

    I cannot see the flickering clearly from the video.

    Is AE adjusting sensor exposure in large steps?

  • 0 in reply to Gang Hua
    Prodigy 250 points
    Gang Hua said:
    Is AE adjusting sensor exposure in large steps?

    It's not AE causing the problem.

    Firstly, the AE parameters undergo monotonic changes during this process.

    Secondly, after bypassing glbce, the flicker disappeared.

    Is there a way to implement GLBCE adjustment after AE convergence？

  • 0 in reply to peng qiang
    TI__Guru 52315 points
    peng qiang said:

    Firstly, the AE parameters undergo monotonic changes during this process.

    Monotonic changes are not enough to avoid flickering because GLBCE uses the statistics from the previous frame for current frame tone mapping.

    If AE changes sensor exposure in large steps, that will cause flickering because GLBCE is not aware of the large sensor exposure change in the current frame.

    AE step size may be limited to 20%~25% per frame.

  • 0 in reply to Gang Hua
    Prodigy 250 points
    Gang Hua said:
    AE step size may be limited to 20%~25% per frame.

    Which parameter is controlling this in the AE algorithm?

    peng qiang said:
    Is there a way to implement GLBCE adjustment after AE convergence？

    Please answer this question.

  • 0 in reply to peng qiang
    TI__Guru 52315 points
    peng qiang said:

    Which parameter is controlling this in the AE algorithm?

    That is inside the AE code where adjustment is decided.

    peng qiang said:
    Is there a way to implement GLBCE adjustment after AE convergence？

    GLBCE takes statistics from previous frame in the GLBCE context memory.
    I don't see anyway to get around that.

  • 0 in reply to peng qiang
    Prodigy 250 points
    peng qiang said:
    AE step size may be limited to 20%~25% per frame.

    Hi Gang

    This solution cannot solve the problem.

    May I ask if there are any other solutions?

  • 0 in reply to peng qiang
    TI__Guru 52315 points

    Hi peng,

    peng qiang said:

    This solution cannot solve the problem.

    It works for most customers when the issue is cause by sensor exposure change and GLBCE context.
    I am not sure what is different in your application.

    peng qiang said:
    May I ask if there are any other solutions?

    I am not aware of any other way.