// Searches just the center pixel, in both the old
//  and new fields, but takes averages. This is an even
// pixel address. Any chroma match will be used. (YUY2)
// We best like finding 0 motion so we will bias everything we found previously
// up by a little, and adjust later

        __asm
        {

#ifdef IS_SSE2
        paddusb xmm7, ONES                // bias toward no motion
#else
        paddusb mm7, ONES                // bias toward no motion
#endif

        MERGE4PIXavg(edi+ecx, esi+ecx)  // center, in old and new

        }
