Wavelet image coding algorithm based on perception
Bo Zhang · Jisuanji gongcheng yu sheji · 2007
In this paper we propose a perceptually-tuned embedded zerotree image coder that introduces a perceptual weighting to the wavelet transform coefficients prior to EZW encoding.The perceptual weighting for all subbands are computed based on the just notice-able distortion(JND) thresholds.And the JND thresholds are computed based on the four different properties of the human visual system that have been studied in the context of image coding: frequency sensitivity,luminance sensitivity,contrast masking,and edge masking.The experiment shows that perceptually-tuned coder produce a lower bit-rate than SPIHT,and has the same perceptual image quality.