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Compression of two-dimensional data

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2 Author(s)

Distortion-free compressibility of individual pictures, i.e., two-dimensional arrays of data, by finite-state encoders is investigated. For every individual infinite pictureI, a quantityrho(I)is defined, called the compressibility ofI, which is shown to be the asymptotically attainable lower bound on the compression ratio that can be achieved forIby any finite-state information-lossless encoder. This is demonstrated by means of a constructive coding theorem and its converse that, apart from their asymptotic significance, might also provide useful criteria for finite and practical data-compression tasks. The proposed picture compressibility is also shown to possess the properties that one would expect and require of a suitably defined concept of two-dimensional entropy for arbitrary probabilistic ensembles of infinite pictures. While the definition ofrho(I)allows the use of different machines for different pictures, the constructive coding theorem leads to a universal compression scheme that is asymptotically optimal for every picture. The results are readily extendable to data arrays of any finite dimension.

Published in:

Information Theory, IEEE Transactions on  (Volume:32 ,  Issue: 1 )

Date of Publication:

Jan 1986

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