標題: Adaptive interpolator with context modeling in lifting scheme for lossless coding
作者: Chang, WT
Ho, WJ
電信工程研究所
Institute of Communications Engineering
關鍵字: adaptive prediction;lifting scheme;multi-resolution prediction;image coding
公開日期: 2000
摘要: Adaptive interpolation with double-interpolator is used for image coding. The double-interpolator means that two adaptive prediction stages are used. The outer loop is an adaptive FIR predictor. The inner loop is an texture based bias estimation. The bias means a content dependent estimated prediction error. By assuming the signals to consist of polynomials of various degrees, the predictor of the outer loop is constructed by linearly combining a set of maximally nat filters. The maximally flat filter is the filtering implementation of the Lagrange interpolation. The prediction is done block by block. Within a block, similar with the lifting scheme, a hierarchical multiresolution prediction is used starting from the fewest resolution 2 by 2 sub-block. The least square prediction error criterion is used to derive the weighting coefficients of the predictor. To further reduce the prediction error, an inner loop to estimate the prediction error is included. Within the inner loop, the pixel to be predicted is classified into groups according to the neighborhood condition. The accumulated mean of the prediction errors of all the pixels within the same group is considered as the bias of the prediction error. This bias is then extracted from the actual prediction error to reduce entropy.
URI: http://hdl.handle.net/11536/19249
http://dx.doi.org/10.1117/12.386670
ISBN: 0-8194-3703-4
ISSN: 0277-786X
DOI: 10.1117/12.386670
期刊: VISUAL COMMUNICATIONS AND IMAGE PROCESSING 2000, PTS 1-3
Volume: 4067
起始頁: 686
結束頁: 693
顯示於類別:會議論文


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