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LL band prediction

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Originally committed as revision 10176 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-08-21 19:38:02 +00:00
parent 7397cf3f09
commit 1e37b7e407
1 changed files with 14 additions and 1 deletions
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15
doc/snow.txt
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@ -233,7 +233,20 @@ FIXME
LL band prediction: LL band prediction:
=================== ===================
FIXME Each sample in the LL0 subband is predicted by the median of the left, top and
left+top-topleft samples, samples outside the subband shall be considered to
be 0. To reverse this prediction in the decoder apply the following.
for(y=0; y<height; y++){
for(x=0; x<width; x++){
sample[y][x] += median(sample[y-1][x],
sample[y][x-1],
sample[y-1][x]+sample[y][x-1]-sample[y-1][x-1]);
}
}
sample[-1][*]=sample[*][-1]= 0;
width,height here are the width and height of the LL0 subband not of the final
video
Dequantizaton: Dequantizaton:
============== ==============