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

Authors:
O. N. Gerek;A. E. Cetin
Affiliations:
Dept. of Electr. & Electron. Eng., Anadolu Univ., Eskisehir, Turkey;-
Venue:
IEEE Transactions on Image Processing
Year:
2006

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Abstract

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 5/3 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° 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.