Low-power multiplierless DCT for image/video coders
Byoung-Il Kim; Ziavras, S.G.
Consumer Electronics, 2009. ISCE apos;09. IEEE 13th International Symposium on
Volume , Issue , 25-28 May 2009 Page(s):133 - 136
Digital Object Identifier 10.1109/ISCE.2009.5156873
Summary:A multiplierless discrete cosine transform (DCT) architecture is proposed to improve the power efficiency of image/video coders. Power reduction is achieved by minimizing both the number of arithmetic operations and their bit width. To minimize arithmetic-operation redundancy, our DCT design focuses on Chen's factorization approach and the constant matrix multiplication (CMM) problem. The 8times1 DCT is decomposed using six two-input butterfly networks. Each butterfly is for 2times2 matrix multiplication and requires a maximum of eight adders/subtractors with 13-bit cosine coefficients. Consequently, the proposed 8times1 DCT architecture is composed of 56 adders and subtractors, which represent a reduction of 61.9% and 46.1% in arithmetic operations compared to the conventional NEDA and CORDIC architectures, respectively. To further improve the power efficiency, an adaptive companding scheme is proposed. The proposed DCT architecture was implemented on a Xilinx FPGA. The results from power estimation show that our architecture can reduce the power dissipation by up to 90% compared to conventional multiplierless DCT architectures.
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