Lossless Transmission of Error Diffused Images by Coding Inversed Multi-level Images Derived by Viterbi Decoding

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  • ビタビ復号による誤差拡散画像の多値化ロスレス圧縮
  • ビタビ フクゴウ ニ ヨル ゴサ カクサン ガゾウ ノ タチカ ロスレス アッシュク

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Abstract

A lossless transmission of an error-diffused image by coding a multi-level image generated through inverse halftoning process using soft decision method similar to Viterbi decoding is proposed and studied. Through the study, block-type error diffusion is introduced, and entropy-based method and prediction-error-based method for inverse halftoning are compared. The result shows that the decoded image by proposed methods has about 30-40% less entropy than that of the original multi-level image. Finally it was expected that the entropy of decoded multi-level image will be even less than that of bi-level image in higher resolution case.

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