Fundamental Concepts in Video
Fundamental Concepts in Video
Fundamental Concepts in Video
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<strong>Fundamental</strong>s of Multimedia, Chapter 5<br />
Chroma Subsampl<strong>in</strong>g<br />
• S<strong>in</strong>ce humans see color with much less spatial resolution than<br />
they see black and white, it makes sense to “decimate” the<br />
chrom<strong>in</strong>ance signal.<br />
• Interest<strong>in</strong>g (but not necessarily <strong>in</strong>formative!)<br />
arisen to label the different schemes used.<br />
names have<br />
• To beg<strong>in</strong> with, numbers are given stat<strong>in</strong>g how many pixel<br />
values, per four orig<strong>in</strong>al pixels, are actually sent:<br />
(a) The chroma subsampl<strong>in</strong>g scheme “4:4:4” <strong>in</strong>dicates that<br />
no chroma subsampl<strong>in</strong>g is used: each pixel’s Y, Cb and<br />
Cr values are transmitted, 4 for each of Y, Cb, Cr.<br />
24 Li & Drew c○Prentice Hall 2003
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