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[TIOVX] About Remap

lei fu1
Expert 1640 points

Hello There,

In J7ES Linux Performance Report:

Index Kernel Variant Frame Size (Pixels) Graph Performance (msec)

Node Performance

(msec)

86 Remap Bilinear Interpolation *640x480 (307200) 9.176000 9.093000

This remap C66X kernel is fully optimized? 

Besides, Do we have other remap kernel which based on C71X?or VPAC?

Best Regards,

Samuel

 

  • 0
    TI__Expert 5655 points

    Samuel,

    From the C66x DSP Core code point of view, it has been optimized within the parameters of the OpenVX spec definition.  Since this could be *any* remap using float coordinates from OpenVX spec, it is somewhat generic and flexible, so the operation operates fully through the L2 cache instead of using DMA acceleration.  That is the main bottleneck, so using some kind of DMA on  the reads could be scope for further optimization.

    However, as you mentioned, the VPAC LDC module does a hardware accelerated remap, so that is recommended.  Please refer to tivxVpacLdcNode API.

    Best Regards,

    Jesse

  • 0 in reply to Jesse Villarreal
    Expert 1640 points

    Hi Jesse,

    Thanks for the reply, Do you know where i can found the performance of VPAC in remap function.

    Thanks a lot!

    Best Regards,

    SAMUEL

  • 0 in reply to lei fu1
    TI__Expert 5655 points

    We haven't added the performance report code for the unit tests for VPAC LDC node yet.  If you want to play with it, you can also using the OpenVX performance API to retrieve the node performance.

    For your reference, we have measured 380 output MPixels/s in bilateral mode in single cam usecase. I think this was at 500MHz clock.  Bicubic mode runs at half the rate of bilateral mode.  This can vary a little based on DDR loading and clock frequencies.

    Regards,

    Jesse