Quantization method, coding apparatus, and computer-readable recording medium storing quantization program

Abstract

A quantization method includes: performing, by a computer, scaling on transform coefficients of a target block; quantizing scaled transform coefficients to obtain a plurality of quantization coefficients; calculating, when calculating, based on a quantization error and a first code amount of a coded target block obtained by coding the target block, a cost of coding the target block by using a coefficient absolute value candidate of a plurality of coefficient absolute value candidates of one of the plurality of quantization coefficients, the first code amount according to a second code amount of a coded element for the one of the plurality of quantization coefficients, the second code amount being obtained by binarizing the coded element under one of a first condition and a second condition.