Dequantization method and apparatus, and video decoding method and apparatus using the dequantization method

摘要

A dequantization method and an apparatus in which restored values for original values are obtained by dequantizing quantization level values generated when the original values are quantized. The dequantization method includes updating a histogram by accumulating histogram counts for the quantization level values, estimating a distribution function of the original values based on the histogram, and obtaining the restored values for the quantization level values from the distribution function.