5

Video data compression

Basic concepts

Digital television in the home was considered an impossibility until very recently. That it is possible now is entirely due to the incredible advances in the suite of data-compression techniques we call MPEG-II. This chapter describes the compression tools used in contemporary picture coding.

Entropy, redundancy and artefacts

If I say to you, ‘Wow, I had a bad night, the baby cried from three ‘til six!’ you understand perfectly what I mean because you know what a baby crying sounds like. I might alternatively have said, ‘Wow, I had a bad night, the baby did this; wah, bwah, bwah, wah …’ and continue for 3 hours. Try it – you’ll find a lot of friends (!) because nobody needs to have it demonstrated. ...

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