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Optical Engineering

Adaptive discrete cosine transform based image coding
Author(s): Neng-Chung Hu; Shyan-Wen Luoh
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Paper Abstract

In this discrete cosine transform (DCT) based image coding, the DCT kernel matrix is decomposed into a product of two matrices. The first matrix is called the discrete cosine preprocessing transform (DCPT), whose kernels are ±1 or ±1/2. The second matrix is the postprocessing stage treated as a correction stage that converts the DCPT to the DCT. On applying the DCPT to image coding, image blocks are processed by the DCPT, then a decision is made to determine whether the processed image blocks are inactive or active in the DCPT domain. If the processed image blocks are inactive, then the compactness of the processed image blocks is the same as that of the image blocks processed by the DCT. However, if the processed image blocks are active, a correction process is required; this is achieved by multiplying the processed image block by the postprocessing stage. As a result, this adaptive image coding achieves the same performance as the DCT image coding, and both the overall computation and the round-off error are reduced, because both the DCPT and the postprocessing stage can be implemented by distributed arithmetic or fast computation algorithms.

Paper Details

Date Published: 1 April 1996
PDF: 8 pages
Opt. Eng. 35(4) doi: 10.1117/1.600708
Published in: Optical Engineering Volume 35, Issue 4
Show Author Affiliations
Neng-Chung Hu, National Taiwan Institute of Technology (Taiwan)
Shyan-Wen Luoh, National Taiwan Inst. of Technology (Taiwan)

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