A New Unified Lossless/Lossy Image Compression Based on a New Integer DCT

Somchart CHOKCHAITAM  Masahiro IWAHASHI  Somchai JITAPUNKUL  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E88-D   No.7   pp.1598-1606
Publication Date: 2005/07/01
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Circuits and Systems--Part 1)
Category: Image Processing and Multimedia Systems
Keyword: 
Integer-DCT,  lossless,  lossy,  image compression,  rounding operation,  rounding effect,  

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Summary: 
In this paper, we propose a new one-dimensional (1D) integer discrete cosine transform (Int-DCT) for unified lossless/lossy image compression. The proposed 1D Int-DCT is newly designed to reduce rounding effects by minimizing number of rounding operations. The proposed Int-DCT can be operated not only lossless coding for a high quality decoded image but also lossy coding for a compatibility with the conventional DCT-based coding system. Both theoretical analysis and simulation results confirm an effectiveness of the proposed Int-DCT.