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

Authors:
Somchart Chokchaitam;Masahiro Iwahashi;Somchai Jitapunkul
Affiliations:
The author is with the Department of Electrical Engineering, Thammasat University, Bangkok, 12121 Thailand. E-mail: csomchar@engr.tu.ac.th,;The author is with the Department of Electrical Engineering, Nagaoka University of Technology, Nagaoka-shi, 940--2188 Japan.,;The author is with the Department of Electrical Engineering, Chulalongkorn University, Bangkok, 10330 Thailand.
Venue:
IEICE - Transactions on Information and Systems
Year:
2005

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Abstract

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.