A Two-Step Approach to Providing a Desired Quality of Lossy Compressed Images

A problem of lossy image compression with providing a desired quality according to a given quality metric is considered. Several approaches to its solving are discussed. A two-step approach based on using the averaged rate-distortion curve is proposed and tested for a coder AGU based on discrete cosine transform. It is shown that it is often possible to use two iteration steps instead of sufficierntly larger number of iterations that makes compression with providing a desired quality faster. Meanwhile, there are ranges of visual quality where further modifications are needed to produce a desired accuracy of quality providing.

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