| 摘要 |
A moving picture coding device according to the present invention includes: a QP deriving unit (106) which derives, based on a moving picture signal, a quantization step and a small quantization step having a size smaller than a size of the quantization step; a small QP position determining unit (104) which determines a position, within a picture, of a first block group to be quantized by using the small quantization step; and a video encoder (110) which quantizes the first block group at the determined position by using the small quantization step and a second block group at a position within the picture other than the position of the first block group by using the quantization step. The small QP position determining unit (104) determines the position of the first block group within each of temporally consecutive pictures such that the position of the first block group within the picture cyclically shifts in a coding order direction in each of a predetermined number of pictures among the temporally consecutive pictures.
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