Shape adaptive technique for image and video compression
AssigneeCompetitive Technologies of PA, Inc.
InventorsWeiping Li, Shipeng Li
Life of this patent
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Abstract
A method for wavelet encoding image-representative signals, including the following steps: identifying shape information of a shape in the image; within rows of pixels of a shape, performing wavelet decompositions for segments of consecutive pixels in the shape; for segments of pixels having out of the shape pixels in a wavelet decomposition, forming a zero tree that includes don't-care nodes and having uncoded don't-care descendents of don't-care nodes.
Claims2
A method for wavelet encoding image-representative signals, comprising the steps of:
- identifying shape information of a shape in the image;
- within rows of pixels of a shape, performing wavelet decompositions for segments of consecutive pixels in the shape;
- for segments of pixels having out of the shape pixels in a wavelet decomposition, forming a zero tree that includes don't-care nodes and having uncoded don't-care descendents of don't-care nodes.
For use in a method for encoding and decoding image-representative signals, which includes the steps of:
- for shapes of said image, applying encoding transforms to a segment of pixels of said shape to obtain a low pass transform component and a high pass transform component;
- and
- applying decoding inverse transforms to said low pass transform component and high pass component;
- the improvement comprising:
- said segment of pixels having a type A extension applied to the leading and trailing boundaries thereof and said low pass transform component having a type A extension applied to the leading boundary thereof and a type B extension applied to the trailing boundary thereof, and said high pass component having a type C extension applied to the leading boundary thereof and a type D extension applied to the trailing boundary thereof.
Dependencies are inferred from the claim text.