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

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2 Author(s)
Gerek, O.N. ; Dept. of Electr. & Electron. Eng., Anadolu Univ., Eskisehir, Turkey ; Cetin, A.E.

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.

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Image Processing, IEEE Transactions on  (Volume:15 ,  Issue: 1 )