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Optical Engineering

Reduction of blocking artifact based on edge information in discrete cosine transform-coded images
Author(s): Goo-Rak Kwon; Ramesh Kumar Lama; Jae-Pyun Pyun; Sang-Woong Lee
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Paper Abstract

We propose new method for the reduction of blocking artifacts present in low bit-rate coded images. This algorithm performs the deblocking operation in two modes that are determined by the number of edge pixels around the block boundary. The number of edge pixels is calculated by applying the Roberts edge filter. An appropriate filtering operation is performed for each mode in both the horizontal and vertical directions. First, when the mode is associated with a smooth region, a strong filtering operation is applied because flat regions are more sensitive to the human visual system. In the second mode, an adaptive low-pass filter that is based on pixel behavior around the block boundaries is applied. This filter reduces the blocking artifact without introducing undesired blurring effects, while the original image edge is preserved. Although the proposed approach is simple and operates in the spatial domain, experimental results show that it improves both the subjective and objective qualities of the coded image with various features.

Paper Details

Date Published: 1 September 2011
PDF: 11 pages
Opt. Eng. 50(9) 097403 doi: 10.1117/1.3625424
Published in: Optical Engineering Volume 50, Issue 9
Show Author Affiliations
Goo-Rak Kwon, Chosun Univ. (Korea, Republic of)
Ramesh Kumar Lama, Chosun Univ. (Korea, Republic of)
Jae-Pyun Pyun, Chosun Univ. (Korea, Republic of)
Sang-Woong Lee, Chosun Univ. (Korea, Republic of)

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