JP6513847B2 - 動画像符号化方法 - Google Patents
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Description
上記では、動き補償に用いる参照フレームの数をP−pictureで1枚、B−pictureで過去フレーム(forward reference picture)と未来フレーム(backward reference picture)の2枚としてきた。しかしながら、過去方向と未来方向の参照フレームとして、それぞれ複数枚を用意し、マクロブロック単位やマクロブロックを分割した小ブロック単位で異なる参照フレームを選択する方法がある。また、従来は、参照フレームは、I−pictureかP−pictureであったが、B−pictureをreference pictureとして選択することも可能とされている。
複数参照フレームにおけるbackward reference pictureの候補に、時間的に過去方向のフレームを含めることを可能とする。この方法ではbackward reference pictureがすべて時間的に過去方向のフレームであることも許される。そのため、総称としてBi−directionalの替わりに、Bi−predictiveという言葉が用いられる。2個の参照フレーム140,150が共に時間的に過去のフレームまたは共に未来のフレームの場合には、現フレームから遠い参照フレーム150に対する動きベクトル127の符号化方法が変更される。図10に示すように、現フレーム121に近い参照フレーム140に対する動きベクトル124を時間的なフレーム位置の割合で換算した動きベクトル125と動きベクトル127との差分ベクトル126が水平・垂直成分毎に符号化される。
従来は、各フレームの処理順序はI−pictureとP−pictureは表示順で、時間的に2個のI/P−picture間に位置する連続するB−pictureが後者のI/P−pictureの直後に続くという図11のフォーマットに従っていた。しかしながら、新しい機能では、許容される表示遅延の範囲であれば、この処理順に限定されない。また、Bi−predictiveの概念を使用する場合には、B−pictureは、後方予測のための参照フレームを持たない場合でも発生し得る。なお、上記の表示順序は、ビデオデータのデータヘッダ情報として符号化されるか、あるいはビデオデータの上位概念にあたり、ビデオデータとオーディオ・音声データの同期処理や、データの分割配信を司る通信レイヤやファイルフォーマットが管理しているため、符号化・復号化処理順序の変更に伴う表示ずれの問題は発生しない。
従来は、各フレームについて、表示位置を示す情報が符号化されていた。しかしながら、この表示位置情報は、実際に表示時に適用される通信パケットやファイルフォーマットに含まれる時刻情報と一致しない場合がある。この問題を避けるために、ビデオデータでは、各フレームを処理番号のみで管理する方法も検討されている。
picture_layer()
{
picture_structure
frame_number
reference_picture_selection_layer()
if(coding_type() == B-picture){
direct_mv_scale_bwd_dir[index]
if(direct_mv_scale_bwd_dir[index]){ // 未来方向
direct_mv_scale_bwd[index]
for(index=0; index<number of forward reference; index++){
direct_mv_scale_fwd_dir[index]
if(direct_mv_scale_fwd_dir[index]) // 過去方向
direct_mv_scale_fwd[index]
}
}
}
}
picture_structure20では、各pictureのスキャン構造(フレーム/フィールド)が示される。frame_number21には、そのフレームの識別番号が示される。このframe_numberの付け方には大きく2種類ある。1つは、時刻情報を含む場合である。この場合には、I,P−pictureでは直前のIまたはP−pictureとのフレーム間隔、B−pictureでは時間的に過去の直前IまたはP−pictureとのフレーム間隔がframe_numberとなる(一般にはTemporal reference;TRと呼ばれている)。2つめは、単純に復号する順番を示す場合である。
Index0:9
Index1:8
Index2:7
Index3:6
Index4:5
なお、ピクチャタイプがP−pictureの場合には、前方向の参照フレーム(forward reference picture set)、B−pictureの場合には、前方向と後方向の参照フレーム(forward reference picture setとbackward reference picture set)のframe_numberが復号される。この際、前方向と後方向の参照フレーム数は個別に設定できるため、異なる場合もある。ピクチャタイプがI−pictureまたはP−pictureの場合には、これらのreference picture set情報に続くバイトアライン情報(データの区切りをバイト単位に併せるための情報)にてピクチャレイヤは終了となる。以降のピクチャヘッダデータは、ピクチャタイプがB−pictureの場合に発生する。なお、本実施例では、上位のネットワーク・通信関連情報が含まれるレイヤに記載されているものと考える。
picture_layer()
{
picture_structure
frame_number
reference_picture_selection_layer()
if(coding_type() == B-picture){
for(index=0; index<number of forward reference; index++){
direct_mv_scale_fwd_dir[index]
direct_mv_scale_fwd[index]
}
for(index=0; index<number of backward reference; index++){
direct_mv_scale_bwd_dir[index]
direct_mv_scale_bwd[index]
}
}
}
B−pictureの場合について説明する。この場合には、現フレームで使用可能な全ての参照フレームについて、データ26〜29が符号化/復号化されるが、これらのデータは図10に示した動きベクトルの符号化処理に利用するpicture_distanceの情報としても利用される。この図2でも図1と同じように、direct_mv_scale_bwd_dir[0]がdirectモードの使用可否を示す役割を果たすが、図2では、さらにデータ26と28の組み合わせにより、図10の処理が使用可能であるか否かを示す。
picture_layer()
{
picture_structure
frame_number
reference_picture_selection_layer()
if(coding_type() == B-picture){
direct_reference_usable
if(direct_reference_usable){
direct_mv_scale_bwd
direct_mv_scale_fwd
}
for(index=0; index<number of forward reference; index++){
picture_distance_fwd_dir[index]
picture_distance_fwd[index]
}
for(index=0; index<number of backward reference; index++){
picture_distance_bwd_dir[index]
picture_distance_bwd[index]
}
}
}
ピクチャタイプがB−pictureの場合について説明する。direct_reference_usable23は、directモード用に指定される後方参照フレームが現フレームよりも未来に位置しているおり、かつdirectモード用に指定される前方参照フレームが現フレームよりも過去に位置しているかを示す情報である。directモード用に指定される後方参照フレームは、通常、index0に割り当てられたbackward reference pictureであるが、この情報にて、index0のbackward reference pictureがdirectモードに使用できるか否かが明確に判断できる。
Claims (1)
- 動画像についての符号化ビットストリームを生成する符号化方法であって、
符号化側から復号化側へ復号対象ブロックの動きベクトル情報が伝送されない予測モードであるか否かの判別に用いる第1のフラグ情報を生成する第1のステップと、
前記符号化側から復号化側へ復号対象ブロックの動きベクトル情報が伝送されない予測モードにおいて、復号側において復号化処理に用いる動きベクトルの算出方法を復号対象ブロックに隣接するブロックの状態と第2のフラグ情報の両者により決定するための、前記第2のフラグ情報を生成する第2のステップとを備え、
前記動きベクトルの算出方法には、
復号側において復号対象ブロックが属するフレームの時間的に後に位置するフレーム内で前記復号対象ブロックと同じ位置にあるブロックが動きベクトルを有さない場合でも、復号対象ブロックに隣接する複数の隣接ブロックが有する動きベクトルから一つの動きベクトルを選択可能な第1の動きベクトル算出方法と、
復号側において復号対象ブロックが属するフレームの時間的に後に位置するフレーム内で前記復号対象ブロックと同じ位置にあるブロックが動きベクトルを有さず、前記復号対象ブロックの上側に位置するブロックおよび前記復号対象ブロックの左側に位置するブロックがいずれも画面外に位置する場合でも、双方向予測のゼロベクトルを選択可能な第2の動きベクトル算出方法と、
復号側において復号対象ブロックが属するフレームの時間的に後に位置するフレーム内で前記復号対象ブロックと同じ位置にあるブロックの動きベクトルに基づいて前記復号対象ブロックの動きベクトルを算出する第3の動きベクトル算出方法が含まれる、ことを特徴とする符号化方法。
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US7154952B2 (en) | 2002-07-19 | 2006-12-26 | Microsoft Corporation | Timestamp-independent motion vector prediction for predictive (P) and bidirectionally predictive (B) pictures |
US8064520B2 (en) | 2003-09-07 | 2011-11-22 | Microsoft Corporation | Advanced bi-directional predictive coding of interlaced video |
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ITTO20040780A1 (it) * | 2004-11-09 | 2005-02-09 | St Microelectronics Srl | Procedimento e sistema per il trattamento di segnali a descrizioni multiple, relativo prodotto informatico |
ITTO20040781A1 (it) * | 2004-11-09 | 2005-02-09 | St Microelectronics Srl | Procedimento per adattare in modo dinamico il bit-rate di un segnale digitale alla larghezza di banda disponibile, relativi dispositivi e prodotto informatico corrispondente |
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