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DM642 Vedio Rotation!

leeway zhai
Prodigy 20 points

Hi all,

           I have a question about DM642 solution.  Are there any way to rotate a image by 90 or 180 degree?

           Best regards!

  • 0
    TI__Expert 8260 points

    This can be easily done using EDMA.

    Regards, Srirami.

  • 0 in reply to srirami
    Prodigy 20 points

    srirami said:

    This can be easily done using EDMA.

    Regards, Srirami.

    Dear srirami,

              Thank you for your reply! But,where could I get the reference PDF about it?Do you mean the TMS320C6000 Chip Support Library API Reference Guide?

    Best regards!

  • 0 in reply to srirami
    Expert 1575 points

    Hi Srirami,

    srirami said:

    This can be easily done using EDMA.

    I would use the phrase 'easily' with extra caution when it comes to 90deg... I'd say that 90 degrees is not possible - because of the memory bandwidth. For 90 degrees rotation you need to move the incoming data bytewise into the external memory! So touching every single incoming pixel. Its even more complicated: first move a multiple of 8 pixels out of the FIFO into internal memory and then distribute the pixels to the 'real' destination.

    In my application (well - a DM648) it is definitely NOT possible to rotate the image 90 degrees without additional time (that I dont have in my app).

    I did a lot of experiments concerning rotated grabbing of incoming (raw) video data and my point of view is that everything other than 0 or 180deg is a no go or very complicated to realize in realtime (buffering of segments in internal memory to shift bigger chunks of data into external memory...)

    bye,

    Thomas