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C6758 LCDK - How many frames per second can be captured with D1 composite input?

JumpStart
Intellectual 605 points
Other Parts Discussed in Thread: TMS320C6748

Hello TI E2E Community,

When I read the VPIF section in the TMS320C6748 Technical Reference Manual, it says the the processor can support SDTV 60 fields NTSC inputs.  I am using the facedetect_lcdk demo application and I am very certain that I am not getting 30 frames per second for the facedetect algorithm.  Can anyone explain what is really supported by the processor and what the demo application is doing?  Do I have to change some settings in the demo program?

Thanks,
JumpStart

  • 0
    Intellectual 605 points

    Hello TI E2E Communit,

    I just figured out why the frame capture is running slow.  It appears that the VGA dispaly function to convert the buffer from CBCR422 semi-planar to RGB565 is taking all the bandwidth and slowing down the frame capture/processing rate.  Once I comment out the function calls to cbcr422sp_to_rgb565_c the capture rate went up to 30 fps.  Hope this will help others using the facedetect demo application on the C6748 LCDK.

    Thanks,
    JumpStart

  • 0 in reply to JumpStart
    Expert 1350 points

    Hello !!

    I have the some problem. Do you mean that I need to comment out the call at the beginig of the program :

    /*extern void cbcr422sp_to_rgb565_c(const unsigned char * restrict, unsigned int,
            unsigned int, const short*, const unsigned char *restrict,
            unsigned int, unsigned short *restrict, unsigned int, unsigned);*/

    I do it but i didn't see no diffrence. Could ypu please help.

    Think you very much