JP2015092707A - ビデオ符号化方法及び装置、ビデオ復号化方法及び装置 - Google Patents
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Abstract
【解決手段】ビデオ符号化方法は、現在ピクチャーを、最大サイズの符号化単位である少なくとも一つの最大符号化単位に分割し、最大符号化単位の領域を分割する回数が増加するにつれて深くなる深度に基づいて、深度ごとに前記最大符号化単位の領域が分割された少なくとも一つの分割領域を符号化して、少なくとも一つの分割領域別に最終符号化結果が出力される深度を決定し、最大符号化単位ごとに少なくとも一つの分割領域別最終符号化結果である映像データと、深度及び予測モードに関する符号化情報を出力する。
【選択図】図1
Description
=max(MinTransformSize,RootTuSize/
(2^MaxTransformSizeIndex)) (1)
現在符号化単位で可能な最小変換単位サイズ‘CurrMinTuSize’と比較して、変換単位分割情報が0である場合の変換単位サイズである‘RootTuSize’は、システム上採択可能な最大変換単位サイズを表す。すなわち、関係式(1)によれば、‘RootTuSize/(2^MaxTransformSizeIndex)’は、変換単位分割情報が0である場合の変換単位サイズである‘RootTuSize’を、最大変換単位分割情報に相応する回数ほど分割した変換単位サイズであり、‘MinTransformSize’は最小変換単位サイズであるため、これらのうち小さな値が、現在現在符号化単位で可能な最小変換単位サイズ‘CurrMinTuSize’でありうる。
=min(MaxTransformSize,PUSize) (2)
すなわち、現在予測モードがインターモードならば、変換単位分割情報が0である場合の変換単位サイズである‘RootTuSize’は、最大変換単位サイズ及び現在予測単位サイズのうち小さな値に設定される。
=min(MaxTransformSize,PartitionSize (3)
すなわち、現在予測モードがイントラモードならば、変換単位分割情報が0である場合の変換単位サイズである‘RootTuSize’は、最大変換単位サイズ及び現在パーティション単位サイズのうち小さな値に設定できる。
110 最大符号化単位分割部
120 符号化単位決定部
130 出力部
200 ビデオ復号化装置
210 受信部
220 映像データ及び符号化情報抽出部
230 映像データ復号化部
400 映像符号化部
410 イントラ予測部
420 動き推定部
425 動き補償部
430 変換部
440 量子化部
450 エントロピー符号化部
460 逆量子化部
470 逆変換部
480 デブロッキング部
490 ループフィルタリング部
500 映像復号化部
510 パージング部
520 エントロピー復号化部
530 逆量子化部
540 逆変換部
550 イントラ予測部
560 動き補償部
570 デブロッキング部
580 ループフィルタリング部
Claims (4)
- 符号化単位の最大サイズに対する情報及び現在深度の符号化単位が下位深度の符号化単位に分割されるか否かを示す分割情報を、ビットストリームから抽出する段階と、
前記分割情報に基づき、最大符号化単位から分割された符号化単位のうちこれ以上分割されない符号化単位を含む階層構造の符号化単位を決定する段階と、
前記最大符号化単位内で前記階層構造の符号化単位を復号化する段階とを含み、
映像は、前記符号化単位の最大サイズを示す情報によって多数の最大符号化単位に分割され、
前記最大符号化単位は前記分割情報に従って、現在深度と下位深度のうち少なくとも一つを含む深度の符号化単位に階層的に分割され、
前記分割情報が前記現在深度で分割されることを示すとき、前記現在深度の符号化単位は周辺符号化単位と独立して、前記下位深度の符号化単位に分割され、
前記分割情報が前記現在深度で分割されないことを示すとき、一つ以上の予測単位は前記現在深度の符号化単位から獲得されることを特徴とするビデオ復号化方法。 - 前記抽出する段階は、
前記ビットストリームから、現在符号化単位の予測のためのパーティションタイプに情報及び予測モードに対する情報、及び前記現在符号化単位の変換のための変換単位のための分割情報を抽出する段階を含むことを特徴とする請求項1に記載のビデオ復号化方法。 - 前記現在深度の符号化単位は、4つの正方形の前記下位深度の符号化単位に分割されることを特徴とする請求項1に記載のビデオ復号化方法。
- 受信されたビットストリームから、符号化単位の最大サイズに対する情報及び現在深度の符号化単位が下位深度の符号化単位に分割されるか否かを示す分割情報を抽出する受信部と、
前記分割情報に基づき、最大符号化単位から分割された符号化単位のうちこれ以上分割されない符号化単位を含む階層構造の符号化単位を決定し、前記最大符号化単位内で前記階層構造の符号化単位を復号化する復号化部を備え、
映像は、前記符号化単位の最大サイズを示す情報に従って、多数の最大符号化単位に分割され、
前記最大符号化単位は前記分割情報に従って、現在深度と下位深度のうち少なくとも一つを含む深度の符号化単位に階層的に分割され、
前記分割情報が前記現在深度で分割されることを示すとき、前記現在深度の符号化単位は周辺符号化単位と独立して、前記下位深度の符号化単位に分割され、
前記分割情報が前記現在深度で分割されないことを示すとき、一つ以上の予測単位は前記現在深度の符号化単位から獲得されることを特徴とするビデオ復号化装置。
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