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US 6,310,972 B1Granted
Shape adaptive technique for image and video compression
AssigneeCompetitive Technologies of PA, Inc.
InventorsWeiping Li, Shipeng Li
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Abstract
A method for encoding an image-representative signal, including the following steps: for shapes of the image, applying a transform to a segment of pixels of the shape to obtain a low pass transform component and a high pass transform component; and for segments with an odd number of pixels, including the odd pixel in the low pass transform component and excluding the odd pixel from the high pass transform component.
Claims11
A method for encoding an image-representative signal, comprising the steps of:
- for shapes of said image, applying a transform to a segment of pixels of said shape to obtain a low pass transform component and high pass transform component;
- and
- for segments with a total number of (2N−1) pixels, including the (2N−1)th pixel in the low pass transform component and excluding the (2N−1)th pixel from high pass transform component, where N is a positive integer.
A method for wavelet encoding image-representative signals, comprising the steps of:
- identifying shape information of a shape in the image;
- within each row of pixels in the shape, identifying a segment of consecutive pixels;
- for an even number of consecutive pixels, Ni, performing a wavelet transformation on the Ni pixels to generate Ni/2 low pass wavelet coefficients and Ni/2 high pass wavelet coefficients, and for an odd number of pixels, Ni, performing a wavelet transformation on the first Ni−1 pixels to generate (Ni−1)/2 low pass wavelet coefficients and (Ni−1)/2 high pass wavelet coefficients and scaling the left over pixel with the low pass coefficients at an end of the segment;
- repeating said wavelet transformations a number of times to obtain wavelet decomposition;
- and
- repeating said wavelet decomposition steps for further rows of pixels in the shape.
3 more elements
Dependencies are inferred from the claim text.