Why Shape Coding? Asymptotic Analysis of the Entropy Rate for Digital Images

Author:

Xin GangtaoORCID,Fan PingyiORCID,Letaief Khaled B.ORCID

Abstract

This paper focuses on the ultimate limit theory of image compression. It proves that for an image source, there exists a coding method with shapes that can achieve the entropy rate under a certain condition where the shape-pixel ratio in the encoder/decoder is O(1/logt). Based on the new finding, an image coding framework with shapes is proposed and proved to be asymptotically optimal for stationary and ergodic processes. Moreover, the condition O(1/logt) of shape-pixel ratio in the encoder/decoder has been confirmed in the image database MNIST, which illustrates the soft compression with shape coding is a near-optimal scheme for lossless compression of images.

Funder

National Key Research and Development Program of China

Publisher

MDPI AG

Subject

General Physics and Astronomy

Reference19 articles.

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5. Soft compression: An approach to shape coding for images;Xin;IEEE Commun. Lett.,2020

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