JP6076438B2 - 映像データを復号化する方法 - Google Patents
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Description
例えば、本願発明は以下の項目を提供する。
(項目1)
映像データを復号化する方法において、
現在予測ユニットの参照ピクチャインデックスと動きベクトルを誘導するステップ;
前記参照ピクチャインデックス及び動きベクトルを利用して現在予測ユニットの予測ブロックを生成するステップ;
量子化係数成分を逆スキャンして量子化ブロックを生成するステップ;
量子化パラメータを利用して前記量子化ブロックを逆量子化して変換ブロックを生成するステップ;
前記変換ブロックを逆変換して残差ブロックを形成するステップ;及び、
前記予測ブロックと残差ブロックを利用して復元ブロックを生成するステップ;を含み、
前記予測ブロックの予測画素は、前記動きベクトルにより選択される補間フィルタを利用して生成されることを特徴とする方法。
(項目2)
前記動きベクトルが1/4画素位置を示す場合、前記補間フィルタは、7タップ非対称フィルタ又は6タップ非対称フィルタであることを特徴とする項目1に記載の方法。
(項目3)
前記量子化パラメータは、量子化ユニット毎に誘導され、前記量子化ユニットのサイズは、コーディングユニットの許容可能なサイズのうち一つであることを特徴とする項目1に記載の方法。
(項目4)
前記量子化パラメータは、差分量子化パラメータ及び量子化パラメータ予測子を利用して誘導されることを特徴とする項目3に記載の方法。
(項目5)
前記量子化パラメータ予測子は、左側量子化パラメータ、上側量子化パラメータ及び以前量子化パラメータのうち、少なくとも2個が有効な場合、有効な2個の量子化パラメータの平均値であることを特徴とする項目4に記載の方法。
(項目6)
前記現在コーディングユニットがピクチャ又はスライスの上側に位置する場合、左側量子化パラメータ及び以前量子化パラメータの平均値であることを特徴とする項目5に記載の方法。
(項目7)
現在フィルタのタップ数は、前記動きベクトルの予測画素位置により決定されることを特徴とする項目1に記載の方法。
Claims (8)
- 単方向予測で映像データを復号化する方法であって、
現在予測ユニットの動き情報を誘導するステップ;
前記動き情報を利用して前記現在予測ユニットの予測ブロックを生成するステップ;
量子化係数成分を逆スキャンして生成した量子化ブロックを量子化パラメータを利用して逆量子化することで変換ブロックを生成するステップ;
前記変換ブロックを逆変換して残差ブロックを生成するステップ;
前記予測ブロックと前記残差ブロックを利用して復元ブロックを生成するステップ;及び
復元されたピクチャにフィルタリングを適用するステップ;を含み、
前記動き情報は、参照ピクチャインデックスと動きベクトルを含み、前記現在予測ユニットの前記参照ピクチャインデックスと前記動きベクトルは、マージインデックスにより特定される空間マージ候補または時間マージ候補のうち一つの動き情報であり、前記空間マージ候補の動き情報は、空間マージ候補ブロックの動き情報であり、前記空間マージ候補ブロックは、現在ブロックの左側ブロック、上側ブロック、右上側ブロック、左下側ブロックまたは左上側ブロックであり、
前記左側ブロック、前記上側ブロック、前記右上側ブロック及び前記左下側ブロックの動き情報がいずれも利用可能な場合は、前記左上側ブロックは、マージ候補ブロックとして設定されず,
前記動きベクトルが1/4画素位置を示す場合、前記予測ブロックの予測画素は、7タップ補間フィルタを利用して生成され、前記動きベクトルが1/2画素位置を示す場合、前記予測ブロックの予測画素は、8タップ補間フィルタを利用して生成され、
前記量子化パラメータは、差分量子化パラメータ及び量子化パラメータ予測子を利用して、一つ以上のコーディングユニットを含む量子化ユニット単位で生成され、左側及び上側量子化パラメータのうち一つのみが利用可能な場合、前記量子化パラメータ予測子は、前記利用可能な一つの量子化パラメータと以前量子化パラメータの平均値に設定されることを特徴とする方法。 - 前記量子化ユニットのサイズは、コーディングユニットの許容可能なサイズのうち一つであることを特徴とする請求項1に記載の方法。
- 前記差分量子化パラメータは、前記量子化ユニット単位で誘導されることを特徴とする請求項1に記載の方法。
- 前記時間マージ候補の動きベクトルは、時間マージ候補ピクチャ内の時間マージ候補ブロックの動きベクトルであり、前記時間マージ候補ブロックの位置は、最大コーディングユニット内での現在ブロックの位置に応じて決定されることを特徴とする請求項1に記載の方法。
- 左側及び上側量子化パラメータが両方とも利用可能な場合、前記量子化パラメータ予測子は、前記左側及び上側量子化パラメータの平均値に設定されることを特徴とする請求項1に記載の方法。
- 左側量子化パラメータ及び上側量子化パラメータが両方とも利用可能でない場合、以前量子化パラメータが、前記量子化パラメータ予測子として設定されることを特徴とする請求項1に記載の方法。
- 前記7タップフィルタは、非対称フィルタであることを特徴とする請求項1に記載の方法。
- 前記8タップフィルタは、対称フィルタであることを特徴とする請求項1に記載の方法。
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