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TDA4VM: Questions about the LDC plugin of DCC tuning tool

wang zhili
Intellectual 885 points
Part Number: TDA4VM

Hello TI experts,

If I want to change the degree of distortion correction in LDC plugin of DCC2.5, what parameters should I adjust?

Thanks.

  • 0
    TI__Guru 53125 points

    Hi Zhili,

    Could you please explain what you need to do exactly?

    In general, you will need to first prepare your mesh LUT and then use the LDC plugin to verify the LUT and get best LDC block parameters.
    While you prepare your mesh LUT in matlab or openvc, you may control your distortion correction freely.

  • 0 in reply to Gang Hua
    Intellectual 885 points

    Hi Gang,

    I have got the mesh LUT through matlab scripts and a good result by reducing the value of "s".

    I want to know the method of how to balance the distortion correction and FOV loss. The value of "s" only affects the size of the output view, right? Then how can I change the correction strength of distortion?

    Thanks.

  • 0 in reply to wang zhili
    TI__Guru 53125 points

    Hi Zhili,

    It sounds like you would like to get larger output FOV by allowing some remaining distortion in output image.

    You will need to design your preferred output view in this case, prepare the mesh LUT accordingly, and then go through the same workflow for LDC.
    This design is beyond the scope of LDC and there is no right or wrong answers regarding LDC programming.
    You may choose the best output view and FOV for your particular application.

  • 0 in reply to Gang Hua
    Intellectual 885 points

    Hi Gang,

    Gang Hua said:
    You will need to design your preferred output view in this case, prepare the mesh LUT accordingly

    How to design output view that I preferred? By changing the parameters in the matlab script?

    Thanks.

  • 0 in reply to wang zhili
    TI__Guru 53125 points
    wang zhili said:
    the method of how to balance the distortion correction and FOV loss

    This balance is up to your applications and your decision.
    You will have to design your own geometric mapping, i.e., the kind and the amount of residual distortion you prefer.

    We don't have any specific recommendations.

  • 0 in reply to Gang Hua
    Intellectual 885 points

    Hi Gang,

    Thanks for your reply, I have one more thing need to confirm:

    Gang Hua said:
    You will have to design your own geometric mapping,

    Does this mean that I need to create my own scripts to generate the mesh LUT that meet my  needs?

  • +1 in reply to wang zhili
    TI__Guru 53125 points

    Yes, you may create your own geometric mapping with any tool (e.g., matlab/octave, python, opencv, ...).

    The sample matlab script in FAQ shows how to convert to the mesh LUT format TDA4 tuning tool needs.