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DS90UB948-Q1: What is difference between HI FRC1/2 and FRC1/2??

Harry Shin1
Expert 6740 points
Part Number: DS90UB948-Q1

Hello Team,

My customer is asking me to explain FRC and Hi FRC.

Here is what I understand from datasheet.

1) There is 4 kind of FRC.

-FRC1 is conventional FRC. it is dithering from 8bit to 6bit. this is front of white balance IP so this is independent of white balance.

-FRC2 is to dither 8bit data from LUT to 6bit conversion in case of 6bit input. FRC2 operates with white balance IP.

-Hi FRC function extend to 9bit from 8bit. and this has 4kind of algorithm to choose in case of certain incoming data like black/white, full or all off R/G/B pixel.

but I don't know difference between Hi FRC1 and Hi FRC2.

Could you pls kindly explain this in more detailed?? and other my understanding is correct??

Thank you.

  • 0
    TI__Expert 6740 points

    Hello Team

    Can I have 2 more question??

    1) When I think over the case of if use FRC and white balance at the same time, does it need to enable FRC1/2 both??

    The reason why, FRC1 will have 8bit input and output will be 6bit, and this would use 8bit LUT for white balance. it means white balance IP output would be 8bit. and FRC2 should be enabled to reduce from 8bit input of LUT for white balance to 6bit output.

    so I think if use FRC and white balance, it needs both FRC1 and FRC2 enable. is this correct??

    2) if customer use 8bit input to 8bit output with enabled white balance, there would be color saturation as below table.

    Original After White balance Note
    255 200 Same luminance
    (color saturation)
    254 200
    253 199 Same luminance
    (color saturation)
    252 199
    251 199
    250 198 Same luminance
    (color saturation)
    249 198
    248 198
    247 197 　
    246 196 　

    Can 948 FRC support dithering to minimize color saturation if use 8bit input to 8bit output with enabled white balance function?? or FRC is only available in case 8bit input to 6bit output.

    Thank you.

  • 0 in reply to Harry Shin1
    TI__Guru 66810 points

    Hi Harry, 

    Thanks for reaching out. I'm looking into this and will provide feedback tomorrow. 

    Regards, 

    Logan

  • 0 in reply to Logan Cummins
    TI__Guru 66810 points

    Hi Harry, 

    Thanks for your patience, please find feedback below:

    Harry Shin1 said:
    but I don't know difference between Hi FRC1 and Hi FRC2.

    This has the same differentiation between the normal FRC1 and FRC2. *1 is before the white balance block, and *2 is after the white balance block. They can be independently or simultaneously implemented. 

    Harry Shin1 said:
    Can 948 FRC support dithering to minimize color saturation if use 8bit input to 8bit output with enabled white balance function?? or FRC is only available in case 8bit input to 6bit output.

    Hopefully I understand the question - but FRC output is always 6bit output, but ability to represent larger color or downscale from 8bit source data.

    Regards, 

    Logan

  • 0 in reply to Logan Cummins
    TI__Expert 6740 points

    Thanks for answer those questions.

    1 quick more question is if my understanding is correct for Hi-FRC.

    it just add more algorithm on FRC??

    Thank you.

  • +1 in reply to Harry Shin1
    TI__Guru 66810 points

    Hi Harry, 

    yes, this is correct. It supports 16M color. 

    Regards, 

    Logan