Picture coding method and picture decoding method
First Claim
1. A picture coding method for coding, on a block-to-block basis, an image by transforming the image into coefficients showing spatial frequency components, the method comprising:
- a predicting step for calculating a predictive value of the number of coefficients other than 0 contained in a current block to be coded based on the numbers of coefficients other than 0 contained in coded blocks located on a periphery of the current block;
a table selecting step for selecting tables for variable length coding based on the predictive value calculated in the predicting step; and
a variable length coding step for performing variable length coding for the number of coefficients other than 0 contained in the current block, with reference to the tables for variable length coding selected in the table selecting step.
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Accused Products
Abstract
The method includes the following units: a coefficient number detecting unit (109) for detecting the number of coefficients which has a value other than 0 for each block according to the generated coefficient, a coefficient number storing unit (110) for storing the number of coefficients detected, a coefficient number coding unit (111) for selecting a table for variable length coding based on the numbers of coefficients in the coded blocks located on the periphery of a current block to be coded with reference to the selected table for variable length coding so as to perform variable length coding for the number of coefficients.
27 Citations
3 Claims
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1. A picture coding method for coding, on a block-to-block basis, an image by transforming the image into coefficients showing spatial frequency components, the method comprising:
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a predicting step for calculating a predictive value of the number of coefficients other than 0 contained in a current block to be coded based on the numbers of coefficients other than 0 contained in coded blocks located on a periphery of the current block; a table selecting step for selecting tables for variable length coding based on the predictive value calculated in the predicting step; and a variable length coding step for performing variable length coding for the number of coefficients other than 0 contained in the current block, with reference to the tables for variable length coding selected in the table selecting step. - View Dependent Claims (2)
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3-33. -33. (canceled)
Specification
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- Resources
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Current AssigneeVideoLabs, Inc.
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsAbe, Kiyofumi, Kadono, Shinya, Kondo, Satoshi, Hagai, Makoto
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current375/240.12
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CPC Class CodesG06T 9/004 Predictors, e.g. intraframe...H04N 19/105 Selection of the reference ...H04N 19/11 among a plurality of spatia...H04N 19/13 Adaptive entropy coding, e....H04N 19/136 Incoming video signal chara...H04N 19/159 Prediction type, e.g. intra...H04N 19/176 the region being a block, e...H04N 19/593 involving spatial predictio...H04N 19/60 using transform codingH04N 19/61 in combination with predict...
