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

Gerek, Ö. N.Çetin, A. Enis2016-02-082016-02-0820061057-7149http://hdl.handle.net/11693/23883Lifting-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.EnglishAdaptive wavelet transformImage codingOrientation adaptive liftingA 2-D orientation-adaptive prediction filter in lifting structures for image codingArticle10.1109/TIP.2005.8593691941-0042