| 摘要 |
A picture coding device has: a coding controlling unit which decides whether or not a to-be-coded picture is to be coded as a high-resolution picture or a low-resolution picture, depending on a picture type of the to-be-coded picture; the first down-conversion unit which down-converts resolution of the to-be-coded picture, when the to-be-coded picture is decided to be coded as a low-resolution picture; the second down-conversion unit which down-converts resolution of a reference picture, when the reference picture is referred to by the to-be-coded picture decided to be coded as a low-resolution picture; and a motion estimation unit, a mode selection unit, a difference operation unit, and a residual coding unit which code the to-be-coded picture whose resolution is down-converted by the first down-conversion unit, referring to the reference picture whose resolution is down-converted by the second down-conversion unit.
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