Fixed-point IDCT without multiplications based on B.G. Lee's algorithm

Authors:
Pingping Zhu;Jianguo Liu;Shengkui Dai
Affiliations:
State Key Lab for Multi-spectral Information Processing Technologies, Key Lab of State Education Ministry for Image Processing and Intelligent Control, Institute for Pattern Recognition and Artifi ...;State Key Lab for Multi-spectral Information Processing Technologies, Key Lab of State Education Ministry for Image Processing and Intelligent Control, Institute for Pattern Recognition and Artifi ...;State Key Lab for Multi-spectral Information Processing Technologies, Key Lab of State Education Ministry for Image Processing and Intelligent Control, Institute for Pattern Recognition and Artifi ...
Venue:
Digital Signal Processing
Year:
2009

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Abstract

An improved approach to compute the inverse discrete cosine transform (IDCT) for image and video coding applications for mobile devices is proposed based on B.G. Lee algorithm. We replace the multiplication operators in original B.G. Lee's algorithm with addition and shift operators to realize the fix-point computation. Due to the absence of the multiplication operators, this modified algorithm takes less time to complete the computation than the traditional B.G. Lee's.