JP2017098967A - 時間的な予測動きベクトル誘導方法及びこのような方法を用いる装置 - Google Patents
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Abstract
【解決手段】予測対象ブロックを含むLCU(Largest Coding Unit)内の予測対象ブロック位置に基づいて、予測対象ブロックの境界とLCUの境界境界とが接しているのか否かを判断し、予測対象ブロックとLCUの境界とが接しているか否かによって第1コロケーテッドブロックが使用可能であるか否かを決定する。第1コロケーテッドブロックが使用可能でない場合、他のコロケーテッドブロックをコロケーテッドブロックと決定する。
【選択図】図6
Description
Definition)映像のような高解像度、高品質な映像への需要が、多様な応用分野において増加しつつある。映像データが高解像度、高品質になるほど既存の映像データに比べて相対的にデータ量が増加するため、既存の有無線の広帯域ネットワークのような媒体を用いて映像データを伝送するか、既存の記憶媒体を用いて記憶する場合、伝送コストと記憶コストが増加する。映像データが高解像度、高品質化になることで発生するこのような問題を解決するためには、高効率の映像圧縮技術が活用されることができる。
search−based Block Matching Algorithm)、TSS(Three Step Search)、NTS(New Three−Step
Search Algorithm)など多様な方法が使用されることができる。動きベクトルは、補間された画素に基づいて1/2または1/4画素単位の動きベクトル値を持つことができる。動き予測部では、動き予測方法を異ならせて現在予測単位を予測することができる。動き予測方法として、スキップ(Skip)法、マージ(Merge)法、AMVP(Advanced Motion Vector Prediction)法など多様な方法が使用されることができる。
Coding Unit)内の位置によって適応的に決定されることができる。以下、本発明における予測部の動作に関して詳述する。
画面内予測方法を行うために、現在予測単位の画面内予測モードは、現在予測単位の周辺に存在する予測単位の画面内予測モードから予測することができる。周辺予測単位から予測されたモード情報を用いて現在予測単位の予測モードを予測する場合、現在予測単位と周辺予測単位との画面内予測モードが同一である場合、所定のフラグ情報を用いて現在予測単位と周辺予測単位との予測モードが同一である旨の情報を伝送することができ、仮に、現在予測単位と周辺予測単位との予測モードが異なっている場合、エントロピー符号化を行って現在ブロックの予測モード情報を符号化することができる。
例えば、再整列部160では、ダイアゴナルスキャン(Diagonal Scan)法を用いて、DC係数から高周波数領域の係数までスキャンして1次元のベクトル形態に変更させることができる。変換単位の大きさ及び画面内予測モードによってダイアゴナルスキャン(Diagonal Scan)法でない2次元のブロック形態の係数を列方向にスキャンする垂直スキャン法、2次元のブロック形態の係数を行方向にスキャンする水平スキャン法が使用されることができる。すなわち、変換単位の大きさ及び画面内予測モードによってダイアゴナルスキャン、垂直方向スキャン及び水平方向スキャンのうちいずれのスキャン法が使用されるかを決定することができる。
(mvLXCol)及びコロケーテッドブロック使用可能性情報(availableFlagLXCol)を算出する(ステップS420)。
Claims (5)
- 映像信号を復号化する方法であって、
ビットストリームから、現在ブロックと関連するコロケーテッドピクチャ内のコロケーテッドブロックを決定するために用いられるコロケーテッド参照インデックスを得るステップと、
隣接ブロックの動きベクトルを用いることによって、前記現在ブロックの空間的な予測動きベクトルを得るステップであって、前記隣接ブロックは、前記現在ブロックと隣接する、ステップと、
前記コロケーテッド参照インデックスに基づいて、前記コロケーテッドピクチャを決定するステップと、
前記コロケーテッドピクチャ内の前記コロケーテッドブロックの動きベクトルを用いることによって、前記現在ブロックの時間的な予測動きベクトルを得るステップと、
前記空間的な予測動きベクトルと前記時間的な予測動きベクトルを含む動きベクトル候補リストを発生するステップと、
発生された前記動きベクトル候補リストに基づいて、前記現在ブロックの画面間予測を実行するステップと、
を備えることを特徴とする映像信号を復号化する方法。 - 前記時間的な予測動きベクトルは、前記コロケーテッドブロックの前記動きベクトルをスケーリングすることによって得られることを特徴とする請求項1に記載の方法。
- 前記コロケーテッドブロックの前記動きベクトルは、前記現在ブロックを含む現在ピクチャと、前記現在ブロックの参照ピクチャとの間の時間的な距離に基づいてスケーリングされることを特徴とする請求項2に記載の方法。
- 前記コロケーテッドブロックの前記動きベクトルは、前記コロケーテッドピクチャと、前記コロケーテッドブロックの参照ピクチャとの間の時間的な距離に基づいてスケーリングされることを特徴とする請求項2に記載の方法。
- 前記コロケーテッドブロックの前記動きベクトルは、第1の時間的な距離と第2の時間的な距離とに基づいてスケーリングされ、前記第1の時間的な距離は、前記現在ブロックを含む現在のピクチャと、前記現在ブロックの参照ピクチャとの間の時間的な距離であり、前記第2の時間的な距離は、前記コロケーテッドピクチャと、前記コロケーテッドブロックの参照ピクチャとの間の時間的な距離であることを特徴とする請求項2に記載の方法。
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