Patent ID: 8873873

Claim:
An image information decoding apparatus comprising: a processor; an inverse quantization unit configured by the processor to: perform, when a chroma format signal has a 4:4:4 format, an inverse quantization of quantized transform coefficients of an encoded image in accordance with an inverse quantization scale factor, the encoded image corresponding to the chroma signal; and generate inverse quantized coefficients corresponding to the chroma signal; and an inverse transformation unit configured by the processor to perform an inverse transformation on 4×4 pixel blocks of the inverse quantized coefficients in accordance with a corresponding normalization coefficient, and generate a decoded image corresponding to the chroma signal based on an output of the inverse transformation, the pixel blocks being associated with inverse transformation scaling factors, and the normalization coefficient being a product of at least two of the inverse transformation scaling factors, wherein the inverse quantization unit is further configured by the processor to: identify one or more of the inverse transformation scaling factors, the identified inverse transformation scaling factors being associated with an application of the inverse transformation to corresponding ones of the pixel blocks; and calculate the inverse quantization scaling factor based on the identified transformation scaling factors and a block size of the inverse transformation applied to the corresponding pixel blocks.