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Proceedings Paper

Block-Effect Reduction In Transform Coding
Author(s): Anh Tran
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Paper Abstract

With the advancement in computational speed, transform coding has been a promising technique in image data compression. Traditionally, an image is divided into exclusive rectangular blocks or subimages. Each subimage is a partial scene of the original image and they are processed independently. In low-bit rate applications, block boundary can develop due to discontinuities between the subimages. A two-stage transform coding scheme to reduce such effect is proposed. The first stage transformation is applied to the subimages, each being a reduced under-sampled image of the original. The second stage transformation is applied to the transform coefficients obtained at the first stage. A simple coder with discrete Walsh-Hadamard transform and uniform quantization is used to compare the preliminary simulation results obtained from the proposed scheme and the traditional method.

Paper Details

Date Published: 20 November 1986
PDF: 6 pages
Proc. SPIE 0707, Visual Communications and Image Processing, (20 November 1986); doi: 10.1117/12.937264
Show Author Affiliations
Anh Tran, University of Lowell (United States)


Published in SPIE Proceedings Vol. 0707:
Visual Communications and Image Processing
T. Russell Hsing, Editor(s)

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