CHAPTER 10 Compression

Reducing a liter of orange juice to a few grams of concentrated powder is what lossy compression is about. The taste of the restored beverage is similar to the taste of orange juice but has often lost some subtlety. In this book we are more interested in sounds and images, but we face the same trade-off between quality and compression. Saving money for data storage and improving transmissions through channels with limited bandwidth are major compression applications.

A transform coder decomposes a signal in an orthogonal basis and quantizes the decomposition coefficients. The distortion of the restored signal is minimized by optimizing the quantization, the basis, and the bit allocation. The basic information theory necessary ...

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