title: A 2-D orientation-adaptive prediction filter in lifting structures for image coding.
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 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.
authors.affiliation: Department of Electrical and Electronics Engineering, Anadolu University, Eskişehir TR-26470, Turkey. ongerek@anadolu.edu.tr
authors.forename: Omer N
authors.initials: ON
authors.lastname: Gerek
authors.forename: A Enis
authors.initials: AE
authors.lastname: Cetin
mesh_terms: D000465:Algorithms; D003196:Computer Graphics; D044962:Data Compression / Q000379:methods*; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D009716:Numerical Analysis, Computer-Assisted; D012815:Signal Processing, Computer-Assisted