JP5410566B2 - マルチプロセッサアーキテクチュア並びにピクチュアベースの先読みウィンドウを具備したデジタルビデオエンコーダのためのパラレルレートコントロール - Google Patents
マルチプロセッサアーキテクチュア並びにピクチュアベースの先読みウィンドウを具備したデジタルビデオエンコーダのためのパラレルレートコントロール Download PDFInfo
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Description
規格H.264が以下に特別に参照されるけれども、記載された思想や原理は特定のビデオコーディング規格に依存するものではなく、規格MPEG−2、規格ISO MPEG−4part10、規格AVC、又は、最近の規格SMPTE VC−1にとって等しく有効である。
I0B2B3P1B5B6P4B8B9P7B11B12P10B14B15I13・・・
表1は、上記GOPの各ピクチュアがマルチプロセッサエンコーダにおいてどのように配分されるのかを単純化された形で表示している。表1において、各タイムスロットuは、3つのピクチュアのためのリアルタイムでの表示期間を表しており、入力がNTSCビデオであった場合、各タイムスロットは3003/30000秒間の期間を有する。
本発明の第1の側面に関連して、ビデオシーケンスを構成する一連のピクチュア群のうちのピクチュアのエンコードされたバージョンを生成するときに使用すべき好適な数のビットに対応するターゲットサイズを決定することによってマルチプロセッサビデオエンコーダを作動する方法であって、(イ)第1の時点で符号化されたピクチュアのバッファの第1のフルネスの程度を算出する工程と、(ロ)前記第1のフルネスの程度に作用して、第2の時点で前記符号化されたピクチュアのバッファの想定された第2のフルネスの程度に戻す工程と、(ハ)前記第2のフルネスの程度に作用して、前記ピクチュアの当初のターゲットサイズに戻す工程とからなり、前記第1の時点が、前記符号化されたピクチュアのバッファの正確なフルネスの程度が算出できるもっとも近接する時点に対応していると共に、前記第2の時点が前記第1の時点の後に生じる方法が提供される。
第1のビデオエンコード手順を用いて複数のピクチュアのエンコードされたバージョンを表わすのに必要なビット数を予測する工程と、
前記将来の時点に先行する第1の時点で符号化されたピクチュアのフルネスの程度を算出する工程と、
以前にエンコードされた複数のピクチュアのエンコードされたバージョンを表わすのに必要な以前に予測されたビット数を以前にエンコードされた複数のピクチュアを表わすのに必要な実際のビット数を比較することによって、不整合項を生成する工程と、
第1の時点で符号化されたピクチュアの算出されたフルネスの程度と前記第1のピクチュアのエンコードされたバージョンを表わすのに必要な予測されたビット数と前記不整合項を組み合わせて前記将来の時点で符号化されたピクチュアの推定されたフルネスの程度に戻る工程を具備し、
前記将来の時点が前記第1のピクチュアのエンコードされたバージョンが符号化されたピクチュアにロードされる時点に対応すると共に、前記第1の時点が符号化されたピクチュアのフルネスの程度が正確に算出される最も近接する時点を現している方法が提供される。
以下の本発明の実施の形態のそれぞれは、いずれか一つのビデオコード規格に特定されるものではない。しかし、この明細書に関して、エンコードするために、問題のビデオコード規格が個別のピクチュア又はフレームをマクロブロックに分割し、複数の一連のピクチュアを分割してピクチュア群(GOP)にするような従来の技術を利用しているものと仮定する。
マイナスの下付数字は、以前にエンコードされたピクチュアであることを示す。
アップ時に、はじめのp+d個のピクチュアに対しては第2パス複雑度が利用できず、したがって、wikは第2パスピクチュアとデシメートされた第1パスピクチュアの複雑さの間が一定の比率となることに特に言及する。
従って、これらのMBに対する累積された第1パス複雑度は、
Claims (1)
- マルチプロセッサエンコーダにより、並列に、複数のピクチュアをエンコードするのに先立ち、未来のある時点において、符号化されたピクチュアのバッファのフルネスの程度を推定することによって前記マルチプロセッサエンコーダを操作する方法であって、
第1のビデオエンコード手順を用いて複数のピクチュアのエンコードされたバージョンを表わすのに必要なビット数を予測する工程と、
前記未来のある時点に先行する第1の時点で符号化されたピクチュアのバッファのフルネスの程度を算出する工程と、
以前にエンコードされた複数のピクチュアのエンコードされたバージョンを表わすのに必要な以前に予測されたビット数を以前にエンコードされた複数のピクチュアを表わすのに必要な実際のビット数を比較することによって、不整合項を生成する工程と、
前記第1の時点で符号化されたピクチュアのバッファの算出されたフルネスの程度と前記第1のピクチュアのエンコードされたバージョンを表わすのに必要な予測されたビット数と前記不整合項を組み合わせて前記未来のある時点で符号化されたピクチュアのバッファの推定されたフルネスの程度を算出する工程を具備し、
前記将来の時点が前記第1のピクチュアのエンコードされたバージョンが符号化されたピクチュアにロードされる時点に対応すると共に、前記第1の時点が符号化されたピクチュアのバッファのフルネスの程度が正確に算出される最も近接する時点を現している方法。
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US63511604P | 2004-12-10 | 2004-12-10 | |
US60/635,116 | 2004-12-10 | ||
US11/269,428 | 2005-11-07 | ||
US11/269,428 US8054880B2 (en) | 2004-12-10 | 2005-11-07 | Parallel rate control for digital video encoder with multi-processor architecture and picture-based look-ahead window |
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JP2007545501A Division JP5236947B2 (ja) | 2004-12-10 | 2005-11-21 | マルチプロセッサアーキテクチュア並びにピクチュアベースの先読みウィンドウを具備したデジタルビデオエンコーダのためのパラレルレートコントロール |
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JP2013183107A Division JP2014014148A (ja) | 2004-12-10 | 2013-09-04 | 量子化パラメータの値を決定する方法 |
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JP2012182816A JP2012182816A (ja) | 2012-09-20 |
JP5410566B2 true JP5410566B2 (ja) | 2014-02-05 |
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JP2012100459A Active JP5410566B2 (ja) | 2004-12-10 | 2012-04-25 | マルチプロセッサアーキテクチュア並びにピクチュアベースの先読みウィンドウを具備したデジタルビデオエンコーダのためのパラレルレートコントロール |
JP2013183107A Pending JP2014014148A (ja) | 2004-12-10 | 2013-09-04 | 量子化パラメータの値を決定する方法 |
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JP2007545501A Active JP5236947B2 (ja) | 2004-12-10 | 2005-11-21 | マルチプロセッサアーキテクチュア並びにピクチュアベースの先読みウィンドウを具備したデジタルビデオエンコーダのためのパラレルレートコントロール |
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JP2013183107A Pending JP2014014148A (ja) | 2004-12-10 | 2013-09-04 | 量子化パラメータの値を決定する方法 |
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US (2) | US8054880B2 (ja) |
EP (1) | EP1820281B1 (ja) |
JP (3) | JP5236947B2 (ja) |
KR (1) | KR101228192B1 (ja) |
CA (1) | CA2590920C (ja) |
WO (1) | WO2006065477A2 (ja) |
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