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US 2006/0215918 A1Published application
Decoding apparatus, dequantizing method, distribution determining method, and program thereof
AssigneeFuji Xerox Co., Ltd.
InventorShunichi Kimura
Life of this patent
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Abstract
A decoding apparatus includes a random-number generating section and a decoding section. The random-number generating section generates random numbers according to distribution of original data corresponding to respective quantization indexes. The decoding section generates decoded data on a basis of the random numbers generated by the random-number generating section.
Claims22
A decoding apparatus comprising:
- a random-number generating section that generates random numbers according to distribution of original data corresponding to respective quantization indexes;
- and
- a decoding section that generates decoded data on a basis of the random numbers generated by the random-number generating section.
A decoding apparatus comprising:
- a first calculating section that calculates at least one of a standard deviation of quantization indexes and a variance of the quantization indexes;
- a second calculating section that calculates at least one of a standard deviation of a Laplace distribution and a variance of the Laplace distribution so that a sum of values of frequency of the quantization indexes within a preset range is equal to an integral value of a Laplace distribution function corresponding to the preset range;
- and
- a distribution estimating section that estimates distribution of original data corresponding to the quantization indexes using at least one of (A) the at least one of the standard deviation and the variance calculated by the first calculating section and (B) the at least one of the standard deviation and the variance calculated by the second calculating section.
1 more element
A dequantizing method comprising:
- generating random numbers according to distribution of original data corresponding to respective quantization indexes;
- and
- generating dequantization values based on the generated random numbers.
A distribution determining method comprising:
- adding values of frequency of the respective quantization indexes;
- and
- calculating at least one of a variance of a Laplace distribution and a standard deviation of the Laplace distribution so that a resultant value of the addition of values of frequency is equal to an integral value when a Laplace distribution function is integrated so that an integral range of a right side is equal to an integral range of a left side with using a maximum frequency position of the Laplace distribution as a reference.
Dependencies are inferred from the claim text.