A 2-D orientation adaptive prediction filter in lifting structures for image coding

被引:76
作者
Gerek, ÖN [1 ]
Çetin, AE
机构
[1] Anadolu Hosp, Dept Elect & Elect Engn, TR-26470 Eskisehir, Turkey
[2] Bilkent Univ, Dept Elect & Elect Engn, TR-06533 Bilkent, Ankara, Turkey
关键词
adaptive wavelet transform; image coding; orientation adaptive lifting;
D O I
10.1109/TIP.2005.859369
中图分类号
TP18 [人工智能理论];
学科分类号
081104 ; 0812 ; 0835 ; 1405 ;
摘要
Lifting-style implementations of wavelets are widely used in image coders. A two-dimensional (2-D) edge adaptive lifting structure, which is similar to Daubechies 513 wavelet, is presented. The 2-D prediction filter predicts the value of the next polyphase component according to an edge orientation estimator of the image. Consequently, the prediction domain is allowed to rotate +/- 45 degrees in regions with diagonal gradient. The gradient estimator is computationally inexpensive with additional costs of only six subtractions per lifting instruction, and no multiplications are required.
引用
收藏
页码:106 / 111
页数:6
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