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TMS320DM6437: about image processing in DM6437

Part Number: TMS320DM6437

   vpfe_init( 0x81000000, 720, 480 );

    vpbe_init( 0x82000000, 720, 480, ntsc_pal_mode);

while(1)

{

PictureSharpen(0x81000000,0x82000000);

}

why the screen  alway fash from top to bottom?is the function take too much time in "PictureSharpen"?How can I deal with it?