JP5718363B2 - 大きいサイズの変換単位を用いた映像符号化、復号化方法及び装置 - Google Patents
大きいサイズの変換単位を用いた映像符号化、復号化方法及び装置 Download PDFInfo
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Description
Claims (4)
- 映像復号化方法において、
符号化単位に基づき符号化された映像に関するビットストリームに対してエントロピー復号化を行って、前記符号化単位に含まれた変換単位の量子化された変換係数を獲得する段階と、
前記量子化された変換係数に対して逆量子化及び逆変換を行って、前記変換単位のレジデュアル値を獲得する段階と、
前記符号化単位に含まれた少なくとも一つの予測単位に対してインター予測を行って予測映像を生成し、前記予測映像と前記レジデュアル値を用いて前記符号化単位のピクセル値を復元する段階と、を含み、
前記逆量子化及び逆変換を行う段階は、
前記予測単位の予測モードがイントラ予測モードではなくインター予測モードと決定されたとき、前記符号化単位の予測単位のサイズを問わず前記符号化単位の変換単位を決定する段階を含み、
前記映像は複数の最大符号化単位で分割され、前記最大符号化単位は分割情報によ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で階層的に分割され、
前記分割情報が現在深度で分割されることを示す場合、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下位深度で分割されないことを示す場合、少なくとも一つ以上の予測単位は前記下位深度の符号化単位から獲得される、
ことを特徴とする映像復号化方法。 - 前記符号化単位のサイズは、64x64、32x32、16x16及び8x8のうちいずれか一つである、
ことを特徴とする請求項1に記載の映像復号化方法。 - 前記符号化単位に含まれる変換単位及び予測単位は、それぞれ前記符号化単位より小さいか等しい、
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、
符号化単位に基づき符号化された映像に関するビットストリームに対してエントロピー復号化を行って、前記符号化単位に含まれた変換単位の量子化された変換係数を獲得するエントロピー復号化部と、
前記量子化された変換係数に対して逆量子化及び逆変換を行って、前記変換単位のレジデュアル値を獲得する逆変換部と、
前記符号化単位に含まれた少なくとも一つの予測単位に対してインター予測を行って予測映像を生成し、前記予測映像と前記レジデュアル値を用いて前記符号化単位のピクセル値を復元する復元部と、を備え、
前記逆変換部は、前記予測単位の予測モードがイントラ予測モードではなくインター予測モードと決定された時、前記符号化単位の予測単位のサイズを問わず前記符号化単位の変換単位を決定し、
前記映像は複数の最大符号化単位に分割され、前記最大符号化単位は分割情報によ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で階層的に分割され、
前記分割情報が現在深度で分割されることを示す場合、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下位深度で分割されないことを示す場合、少なくとも一つ以上の予測単位は前記下位深度の符号化単位から獲得される、
ことを特徴とする映像復号化装置。
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