JP6115799B2 - 符号化方法及び符号化装置 - Google Patents
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Description
本発明者は、以下の問題が生じることを見出した。
以下、本発明の実施の形態1に係る画像符号化装置について説明する。本発明の実施の形態1に係る画像符号化装置は、算術符号化において、制御パラメータの信号種別に応じて、(1)上ブロックを利用してコンテキストを決定するか、(2)上ブロックを利用せずにコンテキストを決定するか、を切り替える。これにより、画質の劣化を抑制しつつ、メモリ使用量を削減できる。
本実施の形態では、上記画像符号化装置100により生成されたビットストリーム124を復号する画像復号装置について説明する。
本実施の形態では、上記第1種別及び第2種別(又は第3種別)としてどのような信号種別を利用すべきかについて説明する。
4.3 Random access, high-efficiency setting
4.5 Low delay, high-efficiency setting
4.7 Low delay, high-efficiency setting (P slices only)
(第2の検証)"skip_flag"
(第3の検証)"no_residual_data_flag"
図11はsplit_coding_unit_flagの算術復号方法について説明するための表である。
図13はskip_flagの算術復号方法について説明するための表である。なお、検証方法は、上述した第1の検証と同様である。
図15Aは"no_residual_data_flag"の算術復号方法について説明するための表である。
上記各実施の形態で示した動画像符号化方法(画像符号化方法)または動画像復号化方法(画像復号方法)の構成を実現するためのプログラムを記憶メディアに記録することにより、上記各実施の形態で示した処理を独立したコンピュータシステムにおいて簡単に実施することが可能となる。記憶メディアは、磁気ディスク、光ディスク、光磁気ディスク、ICカード、半導体メモリ等、プログラムを記録できるものであればよい。
上記各実施の形態で示した動画像符号化方法または装置と、MPEG−2、MPEG4−AVC、VC−1など異なる規格に準拠した動画像符号化方法または装置とを、必要に応じて適宜切替えることにより、映像データを生成することも可能である。
上記各実施の形態で示した動画像符号化方法および装置、動画像復号化方法および装置は、典型的には集積回路であるLSIで実現される。一例として、図33に1チップ化されたLSIex500の構成を示す。LSIex500は、以下に説明する要素ex501、ex502、ex503、ex504、ex505、ex506、ex507、ex508、ex509を備え、各要素はバスex510を介して接続している。電源回路部ex505は電源がオン状態の場合に各部に対して電力を供給することで動作可能な状態に起動する。
上記各実施の形態で示した動画像符号化方法または装置によって生成された映像データを復号する場合、従来のMPEG−2、MPEG4−AVC、VC−1などの規格に準拠する映像データを復号する場合に比べ、処理量が増加することが考えられる。そのため、LSIex500において、従来の規格に準拠する映像データを復号する際のCPUex502の駆動周波数よりも高い駆動周波数に設定する必要がある。しかし、駆動周波数を高くすると、消費電力が高くなるという課題が生じる。
テレビや、携帯電話など、上述した機器・システムには、異なる規格に準拠する複数の映像データが入力される場合がある。このように、異なる規格に準拠する複数の映像データが入力された場合にも復号できるようにするために、LSIex500の信号処理部ex507が複数の規格に対応している必要がある。しかし、それぞれの規格に対応する信号処理部ex507を個別に用いると、LSIex500の回路規模が大きくなり、また、コストが増加するという課題が生じる。
101 制御部
102 差分部
103 変換及び量子化部
104 可変長符号化部
105 逆量子化及び逆変換部
106、206 加算部
107、207 面内予測部
108、208 面間予測部
109、209 スイッチ
121 入力画像信号
122、125、225 残差信号
123、223 量子化変換係数
124 ビットストリーム
126 復元画像信号
127、128、129、227、228 予測画像信号
130、230 制御パラメータ
141 二値化部
142、242 コンテキスト制御部
143 二値算術符号化部
151、251 二値配列
152、252 コンテキストインデクス
200 画像復号装置
201 制御部
202 可変長復号部
204 逆量子化部
205 逆変換部
224 直交変換係数
226 復号画像信号
229 画像信号
241 多値化部
243 二値算術復号部
Claims (3)
- 画像の符号化を制御する制御パラメータを符号化する符号化方法であって、
複数のコンテキストのうち、前記画像に含まれる対象ブロックに使用するコンテキストを決定するコンテキスト決定ステップと、
決定された前記コンテキストを用いて、前記対象ブロックの制御パラメータを算術符号化することでビット列を生成する算術符号化ステップとを含み、
前記コンテキスト決定ステップでは、
前記対象ブロックの制御パラメータが分類される信号種別を判定し、
前記信号種別が第1種別である場合に、前記対象ブロックの左側に隣接する左ブロック、及び前記対象ブロックの上側に隣接する上ブロックの符号化済の制御パラメータを共に利用して前記コンテキストを決定し、
前記信号種別が、前記第1種別と異なる第2種別である場合に、前記上ブロック及び前記左ブロックの符号化済みの制御パラメータを共に利用せず、予め定められた固定値を用いて前記コンテキストを決定し、
前記第1種別には、前記対象ブロックが、複数のブロックに分割されているか否かを示すスプリットフラグ、または、前記対象ブロックを、スキップするか否かを示すスキップフラグが分類され、
前記第2種別には、前記対象ブロックに輝度及び色差の係数情報があるか否かを示す残差フラグが分類される
符号化方法。 - 前記第1種別に分類される制御パラメータは、前記第2種別に分類される制御パラメータと同じ、又は、より大きなサイズの前記対象ブロックに属する
請求項1記載の符号化方法。 - 画像の符号化を制御する制御パラメータを符号化する符号化装置であって、
複数のコンテキストのうち、前記画像に含まれる対象ブロックに使用するコンテキストを決定するコンテキスト決定部と、
決定された前記コンテキストを用いて、前記対象ブロックの制御パラメータを算術符号化することでビット列を生成する算術符号化部とを含み、
前記コンテキスト決定部は、
前記対象ブロックの制御パラメータが分類される信号種別を判定し、
前記信号種別が第1種別である場合に、前記対象ブロックの左側に隣接する左ブロック、及び前記対象ブロックの上側に隣接する上ブロックの符号化済の制御パラメータを共に利用して前記コンテキストを決定し、
前記信号種別が、前記第1種別と異なる第2種別である場合に、前記上ブロック及び前記左ブロックの符号化済みの制御パラメータを共に利用せず、予め定められた固定値を用いて前記コンテキストを決定し、
前記第1種別には、前記対象ブロックが、複数のブロックに分割されているか否かを示すスプリットフラグ、または、前記対象ブロックを、スキップするか否かを示すスキップフラグが分類され、
前記第2種別には、前記対象ブロックに輝度及び色差の係数情報があるか否かを示す残差フラグが分類される
符号化装置。
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