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DLPC900: What exactly is the difference between Video Mode and Video Pattern Mode

Patrick Hendry
Prodigy 60 points
Part Number: DLPC900

I see various mentions of differences between the two modes but I can't find anything definitive.

For instance I see mention that the Video Mode is not pixel accurate and Video Pattern Mode is, but I don't see an explanation of why.  They are both reading the same video signal after all.

I saw somewhere that Video Mode uses built in patterns whereas in Video Pattern Mode the patterns have to be specified explicitly.  If I'm not trying to do anything clever with the patterns why incur the extra work of setting up the pattern?

  • 0
    TI__Expert 3905 points

    Hello Patrick,

    Welcome back to the E2E forum. Thank you for your business!

    Video Mode is not pixel accurate because in video processing, the system may need to do spatial-temporal dithering of the pixels which is not directly controllable. Video Mode uses a complex video sequence. On the other hand, Video Pattern Mode has direct addressing of individual pixels and uses a linear greyscale pattern sequence at each of the bit depths requested.

    If Video Mode suits your application, then it is fine to use. If the application is specifically meant for eye consumption, Video Mode is recommended.

    Best,

    Maxine

  • 0 in reply to Maxine Cabrasawan
    Prodigy 60 points

    Maxine,

    Thank you for the information.  When you refer to the spatial-temporal dithering, is this for gamma correction or something beyond that?

    The application is not for eye consumption.

    Patrick

  • 0 in reply to Patrick Hendry
    TI__Expert 3905 points

    Hello Patrick,

    Gamma correction occurs before the spatial-temporal dithering. Changing the amount of gamma correction will affect the dithering, but the purpose of the dithering is not for gamma correction. Dithering is used to achieve the correct bit depth while using Video Mode.

    Best,

    Maxine