[theora-dev] What's in a name?

Mike Melanson melanson at pcisys.net
Fri Feb 28 11:35:11 PST 2003

On Fri, 28 Feb 2003, Dan Miller wrote:

> This is important because it maximizes correlation between samples when constrained to a single predictor (ie linear delta coding).  I believe this is the pattern we use to predict DC coeffs in a 'superblock' (32 x 32 block with 16 8x8 blocks within), no?

        I'm not sure if I follow you here. From my analysis, that is the
pattern used to code DCT coefficients. First, all of the DC coeffs are
decoded according to that pattern. Then all of the 1st AC coeffs, 2nd AC
coeffs, etc. 

        I don't see the pattern as having anything to do with DC
prediction. After all of the coeffs are unpacked and arranged in rows of
fragments, the DC prediction is reversed.

	-Mike Melanson

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