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AM68A: Values for DISPC Video Port CSC from RGB to YUV

Frank Bergmann
Prodigy 130 points
Part Number: AM68A
Other Parts Discussed in Thread: AM68

Tool/software:

Hello experts,

can anyone provide me the correct coefficient values for the DISPC Video Port Color Space Conversion from RGB to YUV?

Thanks in advance,

Frank

  • 0
    TI__Genius 14430 points

    Your question has been initially assigned to Gang

  • 0 in reply to Chris Tsongas
    TI__Guru 59600 points

    Hi Frank,

    Frank Bergmann said:
    can anyone provide me the correct coefficient values for the DISPC Video Port Color Space Conversion from RGB to YUV?

    AM68 TRM only mentioned the support for "YUV to RGB conversion".

    Those coefficients are provided in driver source code -- mcu_plus_sdk_j722s_10_01_00_22/source/drivers/dss/v0/hw_include/V3/csl_dssVideoPipe.c

    /* Coefficients for BT601-5 YUV to RGB conversion */
static const CSL_DssCscCoeff gVidCscLimitedRangeCoeff = {
    CSL_DSS_CSC_RANGE_LIMITED,
     298,   409,     0,
     298,  -208,  -100,
     298,     0,   517,
    -256, -2048, -2048,
       0,     0,     0
};

static const CSL_DssCscCoeff gVidCscFullRangeCoeff = {
    CSL_DSS_CSC_RANGE_FULL,
    256,   351,     0,
    256,  -179,   -86,
    256,     0,   443,
      0, -2048, -2048,
      0,     0,     0
};

  • 0 in reply to Gang Hua
    Prodigy 130 points

    Hi Gang,

    there is the chapter 12.6.3.11.3 "DISPC VP Color Space Conversion - RGB to YUV" in my TRM for the AM68/J721S2 (SPRUJ28D, page 1661). So I have to assume there is support for RGB to YUV conversion!

    Frank

  • +1 in reply to Frank Bergmann
    TI__Guru 59600 points

    Hi Frank,

    Thanks for the clarification!

    Please refer to the code below from "mcu_plus_sdk_j722s_10_01_00_22/source/drivers/dss/v0/hw_include/V3/csl_dssVide
    oPort.c"

    /* Coefficients for RGB to BT-601 YUV conversion */
static const CSL_DssCscCoeff gVpCscLimtedRangeCoeff = {
    CSL_DSS_CSC_RANGE_LIMITED,
      77,  150,  29,
     -44,  -87, 131,
     131, -110, -21,
       0,    0,   0,
     256, 2048, 2048
};

static const CSL_DssCscCoeff gVpCscFullRangeCoeff = {
    CSL_DSS_CSC_RANGE_FULL,
      66,  129,  25,
     -38,  -74, 112,
     112,  -94, -18,
       0,    0,   0,
       0, 2048, 2048
};