VIDEO CODING DEVICE AND VIDEO DECODING DEVICE

摘要

A contour and a stair-step artifact are efficiently reduced. A video coding device is provided with an inverse quantization means for obtaining a quantization representative value by performing inverse quantization of a quantization index, a inverse frequency transformation means for obtaining a reconstruction image block by performing inverse transformation of the quantization representative value obtained by the inverse quantization means, and a noise mixing means for determining a pseudorandom noise mixing position on the basis of extension information of the reconstruction image block and mixing a pseudorandom noise into an image on the pseudorandom noise mixing position.