DCT Image Coding Employing Emphasis

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Publisher: SMPTE — White Plains, NY
Doc Type: Conference Paper
Content Type: Original Research
Volume: 1996, No. 14A, pp. 159–167
Abstract: Emphasis filtering is very effective to improve reconstructed image quality in subband coding. In this paper, emphasis scheme is applied to DCT coding which is performed with subband filter banks. The characteristics of emphasis filter are dependent on the source image signal. A decoded image is subject to de-emphasis filter of the characteristics inverse to those of the emphasis filter. To avoid transmission of filter parameters for every image, the pair of filters of predetermined characteristics are used for emphasis and de-emphasis. A two-dimensional(2-d) model for approximating image spectrum is proposed for designing these filters. Coding simulations have shown that the proposed scheme achieves about 1dB improvement in the SN ratio compared to the pure DCT scheme. Also, it is shown that the proposed 2-d spectrum model derives more effect of emphasis than conventional models.
Publication Date: 1996-10-01
DOI: 10.5594/M001247
Link: https://doi.org/10.5594/M001247
Author(s): Mario SatoGraduate School of Engineering, Nagoya University Furo-cho, Chikusa-ku, Nagoya 464-01 Japan
Tadahiko KimotoGraduate School of Engineering, Nagoya University Furo-cho, Chikusa-ku, Nagoya 464-01 Japan
Toshiaki FujiiGraduate School of Engineering, Nagoya University Furo-cho, Chikusa-ku, Nagoya 464-01 Japan
Masayuki TanimotoGraduate School of Engineering, Nagoya University Furo-cho, Chikusa-ku, Nagoya 464-01 Japan
Copyright: © 1996 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

[1] Jayant N.S. Noll P. , “Digital coding of waveformes” , Englewood Cliffs NJ , Prentice-Hall , 1984 . EXTERNAL
[2] Tanimoto Wakatsuki , “A New Subband Coding Scheme Employing Emphasis” , International Workshop on HDTV , Vol.2 , pp. 1 – 10 , Oct. 1993 . EXTERNAL
[3] Katto J. Yasuda Y. , “Performance evaluation of subband coding and optimization of its filter coefficients” , SPIE Vol. 1605 Visual Communication and Image Processing 1991: Visual Communication , pp. 95 – 106 , Nov. 1991 . EXTERNAL
[4] Tanimoto M. Yamada A. Naito Y. . “A generalized subband scheme” , IEICE Technical Report, DSP90-58, Aug. 1990 . EXTERNAL
[5] Jayant N. S. Noll Peter , DIGITAL CODING OF WAVEFORMS” , PRENTICE-HALL, INC. , Englewood Cliffs, N.J. , 1984 . EXTERNAL

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Mario Sato, Tadahiko Kimoto, Toshiaki Fujii, and Masayuki Tanimoto; DCT Image Coding Employing Emphasis, SMPTE Meetings and Conferences ( October 1996); SMPTE, 1996. Available at https://doi.org/10.5594/M001247

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Mario Sato, Tadahiko Kimoto, Toshiaki Fujii, and Masayuki Tanimoto; DCT Image Coding Employing Emphasis, SMPTE Meetings and Conferences ( October 1996); SMPTE, 1996. Available at https://doi.org/10.5594/M001247

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<span class="citation">Mario Sato, Tadahiko Kimoto, Toshiaki Fujii, and Masayuki Tanimoto; <cite>DCT Image Coding Employing Emphasis</cite>, SMPTE Meetings and Conferences ( October 1996); SMPTE, 1996. Available at <a href="https://doi.org/10.5594/M001247" target="_blank" rel="noopener">https://doi.org/10.5594/M001247</a></span>

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Mario Sato, Tadahiko Kimoto, Toshiaki Fujii, and Masayuki Tanimoto; DCT Image Coding Employing Emphasis, SMPTE Meetings and Conferences ( October 1996); SMPTE, 1996
doi: 10.5594/M001247
url: https://doi.org/10.5594/M001247

Snippet:

<li>
Mario Sato, Tadahiko Kimoto, Toshiaki Fujii, and Masayuki Tanimoto; <cite id="bib-10-5594-m001247">DCT Image Coding Employing Emphasis</cite>, SMPTE Meetings and Conferences ( October 1996); SMPTE, 1996
<span class="doi">10.5594/M001247</span>
</li>