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TDA4VH-Q1: How to Interpret AWB Tuning Output Graphs

Vaibhav Parashar
Prodigy 60 points
Part Number: TDA4VH-Q1

Tool/software:

Hi,

I am trying to understand the results of the output of AWB tuning done using the DCC tool and have 2 questions about the gray level graphs and the "Measured and interpolated reference for all gray levels". I am using VPAC3 for J784S4.

Questions 1: I posted the graphs for all 4 gray levels below. In each graph I see 4 distinct lines highlighted by the pink line. What exactly are these 4 distinct lines representing?

Question 2: The "Measured and interpolated reference for all gray levels" graph also has 4 distinct lines. What do each of those represent? What do the colors used (green, blue, red and pink) for each lines mean? Specifically is there a reason why green, blue, red and pink were chosen? 

Thank you for your help.

  • 0
    TI__Guru 59250 points

    Hi Vaibhav,

    Your calibration does not look good.
    Please follow the AWB plugin guide carefully.
    Most likely, you have not set the black level correctly.

    Vaibhav Parashar said:
    What exactly are these 4 distinct lines representing?

    Those are for measured on 4 different gray patches of the color checker.

    Vaibhav Parashar said:
    What do the colors used (green, blue, red and pink) for each lines mean? Specifically is there a reason why green, blue, red and pink were chosen? 

    The color has no specific meaning in terms of AWB calibration.

  • 0 in reply to Gang Hua
    Prodigy 60 points

    Hi Gang. Thank you for the clarification.

    So just to be clear the lines in the gray level graphs 1 - 4 are lines for each gray patch right? If that is the case should each gray graph have only 1 line? Why does Gray1_out_of_4 have 4 lines?

    For the Measured and interpolated graph I am assuming based on the description each line is supposed to represent one of the gray levels right? This graph simply is meant to combine all gray 1 - 4 graph data right? 

  • 0 in reply to Vaibhav Parashar
    TI__Guru 59250 points

    Hi Vaibhav,

    Vaibhav Parashar said:
    So just to be clear the lines in the gray level graphs 1 - 4 are lines for each gray patch right? If that is the case should each gray graph have only 1 line? Why does Gray1_out_of_4 have 4 lines?

    I believe all of the 4 lines for main references are plotted together in these 4 graphs.
    Only additional references are plotted separately.

    Vaibhav Parashar said:
    For the Measured and interpolated graph I am assuming based on the description each line is supposed to represent one of the gray levels right? This graph simply is meant to combine all gray 1 - 4 graph data right? 

    Yes, it is for plotting all 4 lines together.