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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Reference frame (video) ： ウィキペディア英語版 Reference frame (video) ''Reference frames'' are frames of a compressed video that are used to define future frames. As such, they are only used in inter-frame compression techniques. In older video encoding standards, such as MPEG-2, only one reference frame – the previous frame – was used for P-frames. Two reference frames (one past and one future) were used for B-frames. ==Multiple reference frames== Some modern video encoding standards, such as H.264/AVC, allow the use of multiple reference frames. This allows the video encoder to choose among more than one previously decoded frame on which to base each macroblock in the next frame. While the best frame for this purpose is usually the previous frame, the extra reference frames can improve compression efficiency and/or video quality. Note that different reference frames can be chosen for different macroblocks in the same frame. The maximum number of concurrent reference frames supported by H.264 is 16. Different reference frames can be chosen for each 8x8 partition of a macroblock. Another video format that supports multiple reference frames is Snow, which can handle up to eight. The Theora codec provides a limited form of multiple reference frames, allowing references to both the preceding frame and the most recent intra frame. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Reference frame (video)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.