INVERSE QUANTIZATION METHOD OF IMAGES, AN INVERSE QUANTIZATION DEVICE THEREOF, A DECODING METHOD, AND A DECODING DEVICE THEREOF, CAPABLE OF REDUCING QUANTIZATION ERRORS

摘要

PURPOSE: An inverse quantization method of images, an inverse quantization device thereof, a decoding method, and a decoding device thereof are provided to reduce quantization errors which is the differences between values recovered through inverse quantization and original values.;CONSTITUTION: An inverse quantization method of images comprises the following steps: a step of extracting a quantization coefficient generated by quantizing a conversion coefficient from encoded bit streams; a step of deciding quantization step revision value for reducing quantization errors; a step of performing inverse quantization using a second quantization step value generated by a first quantization step value for inverse quantization of the quantization coefficient.;COPYRIGHT KIPO 2010