METHOD AND APPARATUS FOR QUANTIZATION, AND METHOD AND APPARATUS FOR INVERSE QUANTIZATION

摘要

Provided are a quantization method and apparatus and an inverse-quantization method and apparatus for determining quantization steps using lengths of runs that are transform coefficients having consecutive zero values and modifying the transform coefficients. The quantization apparatus can modify quantization steps so that the quantization steps are proportional to lengths of previous runs to quantize significant transform coefficients. As a result, a number of bits generated during coding can be reduced without a great deterioration of video quality.