JP2015180082A - 映像復号化方法及び装置 - Google Patents
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Abstract
Description
1338のうち一つに設定される。
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、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示すことができる。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から、それらのうち小さい値が現在符号化単位で可能な最小変換単位サイズ「CurrMinTuSize」であってもよい。
すなわち、現在予測モードがインターモードであるならば、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い値に設定される。
すなわち、現在予測モードがイントラモードであるならば、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い値に設定される。
1770になり、予測単位1770の位置は、最大符号化単位1760の左側上端サンプルに比べ、予測単位1770のスキャン・インデックスpuIdxとして表現される。
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
Claims (4)
- 映像復号化装置が行う映像復号化方法において、
ビットストリームから最大符号化単位の符号化された映像データ及び前記最大符号化単位に含まれた符号化単位の分割情報を獲得する段階と、
ピクチャから分割された最大符号化単位をラスタスキャン順序によって復号化し、前記最大符号化単位の現在深度の符号化単位をジグザグスキャン順序によって復号化し、前記現在深度の第1符号化単位から分割されたブロックをジグザグスキャン順序によって復号化する段階とを含み、
前記ジグザグスキャン順序は、隣接した4つの正方形のブロックの間でラスタスキャン順序によって左上ブロック、右上ブロック、左下ブロック及び右下ブロック順でスキャンする順序を示し、
前記最大符号化単位は、前記分割情報によって前記現在深度及び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で階層的に分割され、
前記分割情報が前記現在深度で分割されることを示す時、前記現在深度の符号化単位は隣接符号化単位と独立して正方形の前記下位深度の符号化単位で4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時、前記現在深度の符号化単位で少なくとも一つの予測単位が獲得されることを特徴とする映像復号化方法。 - 前記復号化する段階は、
前記最大符号化単位に含まれた現在ブロックに隣接する少なくとも一つの最小符号化単位の利用可能性を決定する段階を含むことを特徴とする請求項1に記載の映像復号化方法。 - 前記復号化する段階は、
前記最大符号化単位に含まれた現在ブロックの左側の最小符号化単位、上側の最小符号化単位、右上の最小符号化単位、左上の最小符号化単位及び左下の最小符号化単位のうち少なくとも一つの最小符号化単位の利用可能性を決定する段階を含むことを特徴とする請求項1に記載の映像復号化方法。 - 映像復号化装置において、
ビットストリームから最大符号化単位の符号化された映像データ及び前記最大符号化単位に含まれた符号化単位の分割情報を獲得する獲得部と、
ピクチャから分割された最大符号化単位をラスタスキャン順序によって復号化し、前記最大符号化単位の現在深度の符号化単位をジグザグスキャン順序によって復号化し、前記現在深度の第1符号化単位から分割されたブロックをジグザグスキャン順序によって復号化する復号化部を備え、
前記ジグザグスキャン順序は、隣接した4つの正方形のブロック間でラスタスキャン順序によって左上ブロック、右上ブロック、左下ブロック及び右下ブロック順でスキャンする順序を示し、
前記最大符号化単位は、前記分割情報によって前記現在深度及び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で階層的に分割され、
前記分割情報が前記現在深度で分割されることを示す時、前記現在深度の符号化単位は隣接符号化単位と独立して正方形の前記下位深度の符号化単位で4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時、前記現在深度の符号化単位で少なくとも一つの予測単位が獲得されることを特徴とする映像復号化装置。
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