[x264-devel] Re: about motion compensation

[张睿]

got it, thanks a lot!

2006/12/15, Loren Merritt <lorenm at u.washington.edu>:
>
> On Fri, 15 Dec 2006, ��� wrote:
>
> > in x264, the 3 half-pel planes are interpolated after encoding each
> frame,
> > which is implemented in x264_frame_filter().
> > but I don't understand why more 8 pixels are interpolated than origin
> image
> > width, and I want to know if the 3 half-pel planes could be just
> > inpterpolated without dealing with the 8 pixels.
> > thanks!
>
> Because the interpolation is a 6-tap filter, 5 extra pixels are needed (3
> on the top & left, 2 on the bottom & right). The number is then rounded up
> to the size of an MMX register.
>
> --Loren Merritt
>
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