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Original question:

RAWFE 20-16 Customization- TDA4

20-16 Non Linear LUT Creation

Dinesh bharathi
Intellectual 751 points

Hi team,

1)The Bit Bucket link shared earlier is not working please post an updated link here.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1250611/rawfe-20-16-customization--tda4?tisearch=e2e-sitesearch&keymatch=rawfe%2020%20to%2016%20bit%20data#

2) I checked the TRM and rawfe_lut_20to16_0.txt that is stored in the sdk, there seems to be some deviation with what TRM says about the step function related logic, I was expecting a step value of 32 for 0-2^12 and 2048 for 2^13-2^20. When i checked the sdk shared data the starting is 0,45 and it seems to follow a different function, Am i missing something here or misinterpreting it?

Regards,
Dinesh

  • 0
    TI__Guru 59610 points

    Hi Dinesh,

    Please try this link instead -- https://git.ti.com/cgit/processor-sdk/imaging/tree/tools/default_DCC_profile_gen?h=main

    TRM should be correct -- step value is dependent on input bit depth and not uniform.

  • 0 in reply to Gang Hua
    Intellectual 751 points

    Hi Gang,

    But for some reason the LUT given in the SDK is slightly different than what TRM says. 
     

    Fullscreen rawfe_lut_20to16_0.txt Download 
    0    ,
45   ,
74   ,
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6044 ,
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9615 ,
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10808,
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11193,
11383,
11572,
11760,
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13040,
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65357,
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65535



    Regards,
    Dinesh

  • 0 in reply to Dinesh bharathi
    TI__Guru 59610 points

    Hi Dinesh,

    This is the same as TRM specified -- 639 x 16-bit entries.

  • 0 in reply to Gang Hua
    Intellectual 751 points

    Hi Gang,

    yeah except that the increment is different here, TRM says the step size of 32 till 4095. And 2048 from 4096 t0 2^20. The number of entries are the same but the value is a 16bit value and the step size are different completely.

    Regards,
    Dinesh

  • 0 in reply to Dinesh bharathi
    TI__Guru 59610 points
    Dinesh bharathi said:
    yeah except that the increment is different here,

    The increment is implicitly and not included in the LUT above.
    Everything looks correct to me in "rawfe_lut_20to16_0.txt" -- it is for a mapping from 20-bit to 16-bit.

    I don't see "rawfe_lut_20to16_0.txt" is used anywhere in SDK though.

    Dinesh bharathi said:
    TRM says the step size of 32 till 4095. And 2048 from 4096 t0 2^20.

    Yes, this is correct for 20-bit input.

    BTW, you won't get 20-bit input for LUT except for some very special cases.
    Where are you using the 20-to-16 conversion in VISS?

  • 0 in reply to Gang Hua
    Intellectual 751 points
    Gang Hua said:
    I don't see "rawfe_lut_20to16_0.txt" is used anywhere in SDK though.

    Oh I was expecting this to be default table. Then i wonder how does the system convert the 20 bit decompanded data to 16 bits

    Gang Hua said:
    you won't get 20-bit input for LUT except for some very special cases.

    But we are decompanding from 12 to 20 bits right. 

    Gang Hua said:
    Where are you using the 20-to-16 conversion in VISS?

    This 20-16 is intended for the RAWFE Decompand LUT as mentioned in the TRM. Where the blocks after Decompanding supports 16 bits only.

  • 0 in reply to Gang Hua
    Intellectual 751 points
    Gang Hua said:
    I don't see "rawfe_lut_20to16_0.txt" is used anywhere in SDK though.

    I could see it here : vx_vpac_viss_target_defaults.c

  • 0 in reply to Dinesh bharathi
    TI__Guru 59610 points
    Dinesh bharathi said:
    I could see it here : vx_vpac_viss_target_defaults.c

    Yes, you are correct on that.

    Please also note that this LUT is just a place holder and it is not enabled.

                lutCfg->enable    = 0u;
            lutCfg->inputBits = 16u;
            lutCfg->clip      = 4095u;
            lutCfg->tableAddr = grawfe_lut_20to16;

  • 0 in reply to Gang Hua
    Intellectual 751 points

    I see. Then does this conversion happen within the DCC configuration?

    Fullscreen asamplesensor_lut_wdr_overall_pwl_global.txt Download 
    0,
1,
3,
5,
7,
9,
11,
13,
15,
17,
19,
21,
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25,
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2175,
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4095,
5328,
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13632,
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    As mentioned this file?

  • 0 in reply to Dinesh bharathi
    TI__Guru 59610 points

    This looks like the 12-bit to 16-bit conversion for decompanding and gamma compression.