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An efficient spatial deblocking of images with DCT compression

Title
An efficient spatial deblocking of images with DCT compression
Author
정제창
Keywords
Blocking artifacts; BDCT; Deblocking; Filtering
Issue Date
2015-07
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation
DIGITAL SIGNAL PROCESSING, v. 42, Page. 80-88
Abstract
We propose an adaptive spatial postprocessing algorithm for using in block-based discrete cosine transform (BDCT) coded images. The proposed method is comprised of three procedural steps: a thresholding step, a model classification step, and a deblocking filtering step. First, we apply adaptive thresholding to extract the pixel vector containing the blocking artifacts. This threshold has a strong correlation with image quality and the standard deviation of the pixel vector. Next, we update block types using a simple rule, thus influencing deblocking performance. Our research proposes that the activity of the pixel vector can be used to categorize the pixel vector model. With the pixel vector model determined, we are then able to apply a suitable filter to each model with different local properties. For example, we are able to utilize a directional filter to reduce ringing artifacts in edge regions. With various images and bit-rate conditions, images deblocked by the proposed method exhibit both significant visual quality improvement and PSNR gain, with fairly low computational complexity. (c) 2015 Elsevier Inc. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S1051200415000846http://hdl.handle.net/20.500.11754/26490
ISSN
1051-2004; 1095-4333
DOI
10.1016/j.dsp.2015.03.009
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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