Inverse quantization method, inverse quantization device, and program

摘要

Disclosed is an inverse quantization method that reverse-quantizes multiple quantized values as a set, obtaining a set of multiple inverse quantized values, said method being characterized in that the range of potential inverse quantized values for each quantized value is obtained using at least a signal other than that of the aforementioned quantized value, and in that the set of preliminary inverse quantized values for which the total variation norm is the minimum within the range of potential values for each inverse quantized value is obtained as the aforementioned set of reverse-quantized values.

主权项

1. An inverse quantization method of inverse-quantizing a plurality of quantized values as a set, and obtaining a set of a plurality of inverse-quantized values, of a processor programmed to perform the inverse quantization method, the inverse quantization method comprising:
calculating a preliminary inverse-quantized value of each quantized value of said plurality of quantized values element-by-element by employing said plurality of quantized values; and obtaining a potential range of an inverse-quantized value for each quantized value by employing said plurality of quantized values, a signal other than said quantized value and a conditional probability density function, and obtaining a set of the preliminary inverse-quantized values that attains a minimum total variation norm and lies in a plurality of said potential ranges of inverse-quantized values by employing said set of the preliminary inverse-quantized values calculated element-by-element as initial inverse-quantized value, wherein said plurality of quantized values are calculated by quantizing a plurality of elements x, said signal other than said quantized value is the signal y that has a correlation with said plurality of elements x, and said conditional probability density function is the conditional probability density function fx|y that corresponds to said correlation.