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 Method and apparatus for encoding and decoding

Details
Inventors: Kato, Shiro;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Logan; Sharon D.
Assistant Examiner:
Attorney, Agent or Firm: Lowe, Price, LeBlanc & Becker

In an encoding side, an estimate of input data is generated. An estimation error which is equal to a difference between the estimate and the input data is calculated. The estimation error is classified, thereby generating a category index indicative of a category corresponding to the estimation error. The input data is divided by a divisor, and a remainder of a result of the dividing is generated. The divisor is equal to a given value which is greater than a difference between an upper limit value and a lower limit value defining a range of the category. The category index and the remainder are encoded into corresponding codes which are outputted. In a decoding side, input data is decoded into a category index and a remainder. An estimate is generated from previous output data. A divisor is generated in accordance with the category index. An offset is generated in accordance with the divisor and the estimate. The offset is equal to the divisor multiplied by an integer. The offset and the remainder are added, and thereby new output data is generated in accordance with the offset and the remainder. In the presence of a control signal, the estimate is generated by a prediction process which differs front a prediction process in an encoding side. In the presence of the control signal, the offset is generated so as to increase a correlation between output data and the estimate.

DETAILED DESCRIPTION It is a first object of this invention to provide an improved method of efficient encoding.
It is a second object of this invention to provide an improved method of decoding.
It is a third object of this invention to provide an improved apparatus for efficient encoding.
It is a fourth object of this invention to provide an improved apparatus for decoding.
A first aspect of this invention provides a method of efficient encoding which comprises the steps of generating an estimate of input data; calculating an estimation error which is equal to a difference between the estimate and the input data; classifying the estimation error and generating a category index indicative of a category corresponding to the estimation error; dividing the input data by a divisor and generating a remainder of a result of the dividing, the divisor being equal to a given value which is greater than a difference between an upper limit value and a lower limit value defining a range of the category; and encoding the category index and the remainder into corresponding codes and outputting the codes.
A second aspect of this invention provides a method of decoding which comprises the steps of decoding input data into a category index and a remainder; generating an estimate from previous output data; generating a divisor in accordance with the category index; generating an offset in accordance with the divisor and the estimate, the offset being equal to the divisor multiplied by an integer; and adding the offset and the remainder and thereby generating new output data in accordance with the offset and the remainder; wherein the estimate-generating step comprises the sub step of, in the presence of a control signal, generating the estimate by a prediction process which differs from a prediction process in an encoding side, and wherein the offset-generating step comprises the sub step of, in the presence of the control signal, generating the offset so as to increase a correlation between output data and the estimate


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