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A Novel Psychovisual Threshold on Large DCT for Image Compression

A psychovisual experiment prescribes the quantization values in image compression. The quantization process is used as a threshold of the human visual system tolerance to reduce the amount of encoded transform coefficients. It is very challenging to generate an optimal quantization value based on th...

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Detalles Bibliográficos
Autores principales: Abu, Nur Azman, Ernawan, Ferda
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi Publishing Corporation 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4385660/
https://www.ncbi.nlm.nih.gov/pubmed/25874257
http://dx.doi.org/10.1155/2015/821497
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author Abu, Nur Azman
Ernawan, Ferda
author_facet Abu, Nur Azman
Ernawan, Ferda
author_sort Abu, Nur Azman
collection PubMed
description A psychovisual experiment prescribes the quantization values in image compression. The quantization process is used as a threshold of the human visual system tolerance to reduce the amount of encoded transform coefficients. It is very challenging to generate an optimal quantization value based on the contribution of the transform coefficient at each frequency order. The psychovisual threshold represents the sensitivity of the human visual perception at each frequency order to the image reconstruction. An ideal contribution of the transform at each frequency order will be the primitive of the psychovisual threshold in image compression. This research study proposes a psychovisual threshold on the large discrete cosine transform (DCT) image block which will be used to automatically generate the much needed quantization tables. The proposed psychovisual threshold will be used to prescribe the quantization values at each frequency order. The psychovisual threshold on the large image block provides significant improvement in the quality of output images. The experimental results on large quantization tables from psychovisual threshold produce largely free artifacts in the visual output image. Besides, the experimental results show that the concept of psychovisual threshold produces better quality image at the higher compression rate than JPEG image compression.
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spelling pubmed-43856602015-04-13 A Novel Psychovisual Threshold on Large DCT for Image Compression Abu, Nur Azman Ernawan, Ferda ScientificWorldJournal Research Article A psychovisual experiment prescribes the quantization values in image compression. The quantization process is used as a threshold of the human visual system tolerance to reduce the amount of encoded transform coefficients. It is very challenging to generate an optimal quantization value based on the contribution of the transform coefficient at each frequency order. The psychovisual threshold represents the sensitivity of the human visual perception at each frequency order to the image reconstruction. An ideal contribution of the transform at each frequency order will be the primitive of the psychovisual threshold in image compression. This research study proposes a psychovisual threshold on the large discrete cosine transform (DCT) image block which will be used to automatically generate the much needed quantization tables. The proposed psychovisual threshold will be used to prescribe the quantization values at each frequency order. The psychovisual threshold on the large image block provides significant improvement in the quality of output images. The experimental results on large quantization tables from psychovisual threshold produce largely free artifacts in the visual output image. Besides, the experimental results show that the concept of psychovisual threshold produces better quality image at the higher compression rate than JPEG image compression. Hindawi Publishing Corporation 2015 2015-03-22 /pmc/articles/PMC4385660/ /pubmed/25874257 http://dx.doi.org/10.1155/2015/821497 Text en Copyright © 2015 N. A. Abu and F. Ernawan. https://creativecommons.org/licenses/by/3.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Abu, Nur Azman
Ernawan, Ferda
A Novel Psychovisual Threshold on Large DCT for Image Compression
title A Novel Psychovisual Threshold on Large DCT for Image Compression
title_full A Novel Psychovisual Threshold on Large DCT for Image Compression
title_fullStr A Novel Psychovisual Threshold on Large DCT for Image Compression
title_full_unstemmed A Novel Psychovisual Threshold on Large DCT for Image Compression
title_short A Novel Psychovisual Threshold on Large DCT for Image Compression
title_sort novel psychovisual threshold on large dct for image compression
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4385660/
https://www.ncbi.nlm.nih.gov/pubmed/25874257
http://dx.doi.org/10.1155/2015/821497
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