A 2-D orientation-adaptive prediction filter in lifting structures for image coding
Date
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.
Source Title
IEEE Transactions on Image Processing
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Institute of Electrical and Electronics Engineers
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Language
English