JP6110978B2 - 高効率映像符号化のデルタ量子化パラメータ処理の方法と装置 - Google Patents
高効率映像符号化のデルタ量子化パラメータ処理の方法と装置 Download PDFInfo
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Description
として、CABACが用いられるか、および、CBFが非-ゼロであるか、がテストされる。第四の二条件を満たす場合、デルタQPも伝送される。第三の実施態様によると、第一モードで、各LCUはそれ自身の量子化パラメータを有し、LCUが少なくともひとつの非ゼロ量子化変換係数を有する場合だけ、量子化パラメータ情報が伝送される。第二モードで、各リーフCUはそれ自身の量子化パラメータを有し、リーフCUが少なくともひとつの非ゼロ量子化変換係数を有する場合だけ、量子化パラメータ情報が伝送される。
Claims (16)
- 映像の符号化方法であって、
前記各映像は最大符号化単位(以下、LCUと称す)に分割され、
前記方法は、
現在のLCUを受信する工程、
前記現在のLCUを分割して複数のリーフCUを形成する工程、
予測モード(PreMode)及び符号化ブロックフラグ(CBF)に従い、現在のリーフCUが少なくとも1つの非ゼロ量子化変換係数を有するか否かを決定する工程、
前記現在のリーフCUが少なくとも1つの非ゼロ量子化変換係数を有する場合にはビデオビットストリームの前記現在のリーフCUに量子化パラメータ情報を組み込む工程、及び、
前記現在のリーフCUが非ゼロ量子化変換係数を有さない場合には前記ビデオビットストリームの前記現在のリーフCUに前記量子化パラメータ情報を組み込まない工程
を含む方法。 - 前記現在のリーフCUに量子化パラメータ情報を組み込む工程は、前記映像に対応する前記ビデオビットストリーム内で、前記現在のリーフCUの量子化パラメータ情報を送信する工程を含む
請求項1に記載の方法。 - 前記現在のリーフCUに量子化パラメータ情報を組み込む工程は、少なくとも1つの別のリーフCUの情報から前記現在のリーフCUの量子化パラメータ情報を生成する工程を含む
請求項1に記載の方法。 - 現在のリーフCUが少なくとも1つの非ゼロ量子化変換係数を有するか否かを決定するための前記予測モード及び前記符号化ブロックフラグは、少なくとも1つの別のリーフCUの情報を含む
請求項3記載の方法。 - 量子化パラメータ最小CUサイズ(以下、QP最小CUサイズと称す)を決定し前記現在のリーフCUの前記量子化パラメータ情報を送信する工程と、
前記現在のリーフCUのサイズが前記QP最小CUサイズと等しいかそれより大きく、かつ、前記現在のリーフCUが少なくとも1つの非ゼロ量子化変換係数を有する場合には、前記量子化パラメータ情報を組み込む工程とを含む
請求項1記載の方法。 - 前記QP最小CUサイズは最大CUサイズから生成される
請求項5記載の方法。 - 構文要素(qp_mаx_depth)は最大CUから前記QP最小CUサイズの深さを定義する
請求項6記載の方法。 - 前記構文要素(qp_mаx_depth)はシーケンスヘッダ、画像ヘッダ又はスライスヘッダに組み込まれている
請求項7記載の方法。 - 映像に対応するビデオビットストリームを復号する方法であって、
前記各映像は最大符号化単位(以下、LCUと称す)に分割され、各LCUが前記LCUより小さい符号化単位(以下、CUと称す)で分割されることで複数のリーフCUが形成され、
前記方法は、
前記ビデオビットストリームから、現在のリーフCUに関連する符号化データを受信する工程、
予測モード(PreMode)及び符号化ブロックフラグ(CBF)に従い、前記現在のリーフCUが少なくとも1つの非ゼロ量子化変換係数を有するか否かを決定する工程、
前記現在のリーフCUが少なくとも1つの非ゼロ量子化変換係数を有する場合には、前記符号化データから前記少なくとも1つの非ゼロ量子化変換係数を引き出し、前記ビデオビットストリームから前記現在のリーフCUの量子化パラメータ情報を得て、前記量子化パラメータ情報を前記少なくとも1つの非ゼロ量子化変換係数に適用することにより前記現在のリーフCUの変換係数を再構築する工程、及び、
前記現在のリーフCUが少なくとも1つの非ゼロ量子化変換係数を有さない場合には、前記現在のリーフCUのゼロ量子化変換係数を再構築する
方法。 - 前記現在のリーフCUの前記量子化パラメータ情報は、前記ビデオビットストリームから得られる
請求項9記載の方法。 - 前記現在のリーフCUの前記量子化パラメータ情報は、少なくとも別のリーフCUの情報から生成することにより得られる
請求項9記載の方法。 - 現在のリーフCUが少なくとも1つの非ゼロ量子化変換係数を有するか否かを決定するための前記予測モード及び前記符号化ブロックフラグは、少なくとも1つの別のリーフCUの情報を含む
請求項11記載の方法。 - 量子化パラメータ最小CUサイズ(以下、QP最小CUサイズと称す)を決定し前記ビデオビットストリームから前記現在のリーフCUの前記量子化パラメータ情報を得る工程と、
前記現在のリーフCUのサイズが前記QP最小CUサイズと等しいかそれより大きく、かつ、前記現在のリーフCUが少なくとも1つの非ゼロ量子化変換係数を有する場合には、前記量子化パラメータ情報を得る工程とを含む
請求項9記載の方法。 - 前記QP最小CUサイズは最大CUサイズから生成される
請求項13記載の方法。 - 最大CUから前記QP最小CUサイズの深さを定義する構文要素(qp_mаx_depth)を得る工程を含む
請求項14記載の方法。 - 前記構文要素(qp_mаx_depth)はシーケンスヘッダ、画像ヘッダ又はスライスヘッダから得られる
請求項15記載の方法。
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JP2016165124A (ja) | 2016-09-08 |
BR112013007272A2 (pt) | 2016-06-14 |
BR112013007272B1 (pt) | 2021-12-07 |
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