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Design of an Efficient Lossless CODEC for Wavelet Coefficients  

Lee, Seonyoung (School of Electronics and Information Engineering, Hankuk University of Foreign Studies)
Kyeongsoon Cho (School of Electronics and Information Engineering, Hankuk University of Foreign Studies)
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Abstract
The image compression based on discrete wavelet transform has been widely accepted in industry since it shows no block artifacts and provides a better image quality when compressed to low bits per pixel, compared to the traditional JPEG. The coefficients generated by discrete wavelet transform are quantized to reduce the number of code bits to represent them. After quantization, lossless coding processes are usually applied to make further reduction. This paper presents a new and efficient lossless coding algorithm for quantified wavelet coefficients based on the statistical properties of the coefficients. Combined with discrete wavelet transform and quantization processes, our algorithm has been implemented as an image compression chip, using 0.5${\mu}{\textrm}{m}$ standard cells. The experimental results show the efficiency and performance of the resulting chip.
Keywords
Image Compression; Discrete wavelet transform; Lossless coding;
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