Patent ID: 8355586

Claim:
A distribution determining method comprising: classifying quantization indexes according to an attribute; estimating the distribution of classified quantization indexes with the attribute by: adding values of frequency of the respective quantization indexes; calculating at least one of a variance of a Laplace distribution and a standard deviation of the Laplace distribution so that 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, a resultant value of the addition of values of frequency is equal to an integral value; and prior to calculating at least one of the variance and the standard deviation, a frequency distribution of the Laplace distribution is normalized through a normalizing process, which generates a normalized histogram; and estimating the distribution of classified quantization indexes without the attribute based upon using the distribution of the classified quantization indexes with the attribute.