| 摘要 |
A device coding a moving picture in units of a group including pictures, including: a generation unit generating quantization matrices; a selection unit selecting a quantization matrix for a current picture; a unit storing the quantization matrices in a header part of the group, and coding the current picture; a unit including a virtual buffer, and performing buffer simulation based on an amount of bits to be outputted; and a unit determining whether bit amount reducing is required for the current picture, based on a result of the buffer simulation, wherein the generation unit generates a normal quantization matrix used in common for at least one of the pictures, and a quantization matrix for bit amount reducing used only when the bit amount reducing is required, and the selection unit selecting the quantization matrix for bit amount reducing used for the current picture, when the bit amount reducing is required.
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