[Theora-dev] DC prediction question

Timothy B. Terriberry tterribe at vt.edu
Thu May 5 03:58:23 PDT 2005

Marco Bagnaresi wrote:
> Can someone tell me why specification differ from reference implementation?
> In specification blocks L,DL,D and DR are used for DC prediction, but in implementation
> L,UL,U and UR are used. This brings to different results ... or not?
> What's the correct version?
> Thanks in advance

In the implementation, the image is stored upside down (for historical,
Windows-related reasons). Thus what is labelled "up" in the code is
really "down".

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