| 摘要 |
A video encoder comprises an encoding section (28) for selectively performing on an input video signal an intra-coding mode for intraframe coding, an inter-coding mode for interframe coding, and a non-coded mode in which no coding is performed and the previous frame is used for display, a mode selector section (22) for adaptively selecting among the coding modes for each predetermined region in the input video signal, and a refresh section (23) for detecting a motion region from within a frame and setting up an intraframe-coded region for refresh in a portion of a refresh range including the motion region. The refresh section determines which of a motion region having motion and a still region with no motion each of intraframe-coded macroblocks belongs to, determines the refresh range in the next frame on the basis of the result of the determination, and instructs the intra mode to the mode select circuit when a macroblock to be coded belongs to the refresh range. <IMAGE> |
