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Improved differential pulse code modulation-block truncation coding method adopting two-level mean squared error near-optimal quantizers

Authors
Choi, Kang-SunKo, Sung-Jea
Issue Date
4월-2011
Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
Keywords
quantizer optimization; differential pulse code modulation; block truncation coding
Citation
OPTICAL ENGINEERING, v.50, no.4
Indexed
SCIE
SCOPUS
Journal Title
OPTICAL ENGINEERING
Volume
50
Number
4
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/112765
DOI
10.1117/1.3560261
ISSN
0091-3286
Abstract
The conventional hybrid method of block truncation coding (BTC) and differential pulse code modulation (DPCM), namely the DPCM-BTC method, offers better rate-distortion performance than the standard BTC. However, the quantization error in the hybrid method is easily increased for large block sizes due to the use of two representative levels in BTC. In this paper, we first derive a bivariate quadratic function representing the mean squared error (MSE) between the original block and the block reconstructed in the DPCM framework. The near-optimal representatives obtained by quantizing the minimum of the derived function can prevent the rapid increase of the quantization error. Experimental results show that the proposed method improves peak signal-to-noise ratio performance by up to 2 dB at 1.5 bit/pixel (bpp) and by 1.2 dB even at a low bit rate of 1.1 bpp as compared with the DPCM-BTC method without optimization. Even with the additional computation for the quantizer optimization, the computational complexity of the proposed method is still much lower than those of transform-based compression techniques. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3560261]
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