An Improved Floating-to-Fixed-Point Conversion Scheme for DCT Quantization Algorithm

Authors:
Lin Wang;Fuliang Yin;Zhe Chen
Affiliations:
School of Electronic and Information Engineering, Dalian University of Technology, Dalian, People's Republic of China 116023;School of Electronic and Information Engineering, Dalian University of Technology, Dalian, People's Republic of China 116023;School of Electronic and Information Engineering, Dalian University of Technology, Dalian, People's Republic of China 116023
Venue:
Journal of Signal Processing Systems
Year:
2012

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Abstract

Conventional fixed-point implementation of the DCT coefficients quantization algorithm in video compression may result in deteriorated image quality. The paper investigates this problem and proposes an improved floating-to-fixed-point conversion scheme. With a proper scaling factor and a new-established look-up table, the proposed fixed-point scheme can obtain bit-wise consistence to the floating-point realization. Experimental results verify the validity of the proposed method.