@article{oai:niigata-u.repo.nii.ac.jp:00001827,
 author = {Joo, Sanghyun and Kikuchi, Hisakazu and Sasaki, Shigenobu and Shin, Jaeho},
 issue = {12},
 journal = {IEICE transactions on communications, IEICE transactions on communications},
 month = {Dec},
 note = {A zerotree image-coding scheme is introduced that effectively exploits the inter-scale self-similarities found in the octave decomposition by a wavelet transform. A zerotree is usuful for efficiently coding wavelet coefficients ; its efficiency was proved by Shapiro's EZW. In the EZW coder, wavelet coefficients are sympolized, then entropy-coded for further compression. In this paper, we analyze the symbols produced by the EZW coder and discuss the entropy for a symbol. We modify the procedure used for symbol-stream generation to produce lower entropy. First, we modify the fixed relation between a parent and children used in the EZW coder to raise the propability that a significant parent has significant children. The modified relation is flexibly modified again based on the observation that a significant coefficient is more likely to have significant coefficients in its neighborhood. The three relations are compared in terms of the number of symbols they produce.},
 pages = {2528--2535},
 title = {A new image coding technique with low entropy using a flexible zerotree},
 volume = {E81-B},
 year = {1998}
}