White Papers

Adaptive Directional Lifting-Based Wavelet Transform for Image Coding

Overview This paper presents a novel 2-D wavelet transform scheme of Adaptive Directional Lifting (ADL) in image coding. Instead of alternately applying horizontal and vertical lifting, as in present practice, ADL performs lifting-based prediction in local windows in the direction of high pixel correlation. Hence, it adapts far better to the image orientation features in local windows. The ADL transform is achieved by existing 1-D wavelets and is seamlessly integrated into the global wavelet transform. The predicting and updating signals of ADL can be derived even at the fractional pixel precision level to achieve high directional resolution, while still maintaining perfect reconstruction.

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Publisher: Institute of Electrical and Electronics Engineers
File Format: PDF
Date Published: May 23, 2007
Format: White Papers
Topics: Programming Languages

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