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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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2015/821497 |
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| author | Nur Azman Abu Ferda Ernawan |
| author_facet | Nur Azman Abu Ferda Ernawan |
| author_sort | Nur Azman Abu |
| collection | DOAJ |
| 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. |
| format | Article |
| id | doaj-art-d1898fd798b044c7afe7fe73fd0934ba |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-d1898fd798b044c7afe7fe73fd0934ba2025-02-03T01:31:42ZengWileyThe Scientific World Journal2356-61401537-744X2015-01-01201510.1155/2015/821497821497A Novel Psychovisual Threshold on Large DCT for Image CompressionNur Azman Abu0Ferda Ernawan1Faculty of Information and Communication Technology, Universiti Teknikal Malaysia Melaka, 76100 Melaka, MalaysiaFaculty of Information and Communication Technology, Universiti Teknikal Malaysia Melaka, 76100 Melaka, MalaysiaA 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.http://dx.doi.org/10.1155/2015/821497 |
| spellingShingle | Nur Azman Abu Ferda Ernawan A Novel Psychovisual Threshold on Large DCT for Image Compression The Scientific World Journal |
| 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 |
| url | http://dx.doi.org/10.1155/2015/821497 |
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