Adaptive EZW coding using a rate-distortion criterion

Che-Yi Yin

doi:10.1117/12.430993

3 July 2001 Adaptive EZW coding using a rate-distortion criterion

Che-Yi Yin

Proceedings Volume 4322, Medical Imaging 2001: Image Processing; (2001) https://doi.org/10.1117/12.430993
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

Abstract

This work presents a new method that improves on the EZW image coding algorithm. The standard EZW image coder uses a uniform quantizer with a threshold (deadzone) that is identical in all subbands. The quantization step sizes are not optimized under the rate-distortion sense. We modify the EZW by applying the Lagrange multiplier to search for the best step size for each subband and allocate the bit rate for each subband accordingly. Then we implement the adaptive EZW codec to code the wavelet coefficients. Two coding environments, independent and dependent, are considered for the optimization process. The proposed image coder retains all the good features of the EZW, namely, embedded coding, progressive transmission, order of the important bits, and enhances it through the rate-distortion optimization with respect to the step sizes.

Citation Download Citation

Che-Yi Yin "Adaptive EZW coding using a rate-distortion criterion", Proc. SPIE 4322, Medical Imaging 2001: Image Processing, (3 July 2001); https://doi.org/10.1117/12.430993

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