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more complete dc prediction description

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Originally committed as revision 10177 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Michael Niedermayer 2007-08-21 19:44:05 +00:00
parent 1e37b7e407
commit 2cc454705b
1 changed files with 5 additions and 0 deletions
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doc/snow.txt
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@ -225,6 +225,11 @@ Intra DC Predicton:
the luma and chroma values of the left block are used as predictors the luma and chroma values of the left block are used as predictors
the used luma and chroma is the sum of the predictor and y_diff, cb_diff, cr_diff the used luma and chroma is the sum of the predictor and y_diff, cb_diff, cr_diff
to reverse this in the decoder apply the following:
block[y][x].dc[0] += block[y][x-1].dc[0];
block[y][x].dc[1] += block[y][x-1].dc[1];
block[y][x].dc[2] += block[y][x-1].dc[2];
block[*][-1].dc[*]= 128;
Motion Compensation: Motion Compensation: