Examples of Codec Designs

In this chapter, we describe several image codec designs in some detail. Our purpose is not to present the current state of the art, for that changes almost on a daily basis. Rather, we wish to show how the basic principles discussed in previous chapters might be applied in an interrelated way to practical systems. Some applications require a simple codec without a high degree of data compression. In other cases we need a low bit-rate because of expensive transmission channels, and codec cost is less of a consideration. In still other situations we want very high picture quality, with less concern about low complexity and compression capabilities. The techniques described in this chapter cover a range of complexity, picture quality and data compression in order to assist in the making of sound engineering decisions when designing image communication systems. However, some of the implementations also contain a certain amount of ad hoc procedures that can only be optimized by experimentation.

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