A 2-D orientation-adaptive prediction filter in lifting structures for image coding
Date
2006
Authors
Editor(s)
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
IEEE Transactions on Image Processing
Print ISSN
1057-7149
Electronic ISSN
1941-0042
Publisher
Institute of Electrical and Electronics Engineers
Volume
15
Issue
1
Pages
106 - 111
Language
English
Type
Journal Title
Journal ISSN
Volume Title
Series
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.