Locally-adaptive perceptual quantization without side information for DCT coefficients

Ingo S. Hontsch; Lina Karam

Locally-adaptive perceptual quantization without side information for DCT coefficients

Ingo S. Hontsch, Lina Karam

IAFSE-ECEE: Electrical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

Existing JPEG/MPEG compliant perceptual coding methods do not fully exploit the local variation of perceptual masking thresholds. This work demonstrates that, for natural images with the same perceptual quality, the first-order entropy of the quantizer outputs can be reduced by 15 to 40 percent when optimal locally-adaptive perceptual quantization is used. Locally-adaptive perceptual quantization requires the perceptual thresholds to be available at the decoder. However, transmitting the thresholds is prohibited by the large amount of side information required. In this paper, a DCT-based method is introduced that performs locally-adaptive perceptual quantization without side information based on estimates of the perceptual thresholds from the already quantized data. Since no additional side information is required, this method is compliant with the bit stream syntax of the above mentioned standards.

Original language	English (US)
Title of host publication	Conference Record of the Asilomar Conference on Signals, Systems and Computers
Editors	M.P. Farques, R.D. Hippenstiel
Publisher	IEEE Comp Soc
Pages	995-999
Number of pages	5
Volume	2
State	Published - 1998
Event	Proceedings of the 1997 31st Asilomar Conference on Signals, Systems & Computers. Part 1 (of 2) - Pacific Grove, CA, USA Duration: Nov 2 1997 → Nov 5 1997

Other

Other	Proceedings of the 1997 31st Asilomar Conference on Signals, Systems & Computers. Part 1 (of 2)
City	Pacific Grove, CA, USA
Period	11/2/97 → 11/5/97

ASJC Scopus subject areas

Hardware and Architecture
Signal Processing
Electrical and Electronic Engineering

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Hontsch, I. S., & Karam, L. (1998). Locally-adaptive perceptual quantization without side information for DCT coefficients. In M. P. Farques, & R. D. Hippenstiel (Eds.), Conference Record of the Asilomar Conference on Signals, Systems and Computers (Vol. 2, pp. 995-999). IEEE Comp Soc.

Hontsch, IS & Karam, L 1998, Locally-adaptive perceptual quantization without side information for DCT coefficients. in MP Farques & RD Hippenstiel (eds), Conference Record of the Asilomar Conference on Signals, Systems and Computers. vol. 2, IEEE Comp Soc, pp. 995-999, Proceedings of the 1997 31st Asilomar Conference on Signals, Systems & Computers. Part 1 (of 2), Pacific Grove, CA, USA, 11/2/97.

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