Abstract
This chapter illustrates the compression instruments used in contemporary picture coding. Different compression techniques have been categorized into– namely, (1) lossless systems and (2) lossy systems. Lossless compression makes vigorous use of efficiency gains in the manner in which the data is coded. Such a system does not confuse entropy for redundancy and therefore, dispense with important information. On the other hand, lossy compression techniques attempt a complete and detailed distinction between entropy and redundancy by stressing on the knowledge of predictive powers of the human perceptual systems. Lempel-Ziv-Welch is an important device that is much better than run-length encoding. While attempting to curtail the overall data-rate, adding a quantizer to the lossless differential pulse code modulation system work wonders, whereby limiting the possible gamut of prediction error signals. The chapter also discusses the fact that a system must be designed in such a way that it can successfully cope up with all the possible link errors. The predictor is arranged to be non-optimal, thereby creating a higher overall data-rate. The non-optimal predictor is also referred to as a “leaky” predictor.
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