JP6251627B2 - ジオメトリック分割されたスーパブロックをビデオ符号化およびビデオ復号する方法および装置 - Google Patents
ジオメトリック分割されたスーパブロックをビデオ符号化およびビデオ復号する方法および装置 Download PDFInfo
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Description
Pフレーム:
f(x,y)=xcosθ+ysinθ−ρ
ここで、ρ、θは、それぞれ以下のものを、表す。
f(x,y)と直角をなす方向における原点から境界線f(x,y)までの距離
f(x,y)と直角をなす方向と水平座標軸xがなす角度
その公式からの直接的な展開として、より高次のジオメトリックパラメータを有するf(x,y)についてのより込み入ったモデルも考えられる。
MPEG−4 AVC規格の限界を克服するために、高精細度コンテンツ圧縮に対して、様々な研究努力がなされてきた。これの明白な例は、マクロブロックサイズを増加させる研究である。成果として、16×16よりも大きいマクロブロックサイズを可能にしたことの利点が得られている。MPEG−4 AVC規格ビデオコーデックを補足するために、32×32、32×16、および16×32などの拡張されたパーティションブロックモードが使用された。拡大マクロブロックサイズを使用した場合、相対的に大きな利得を示すそのような拡張パーティションブロックモードの使用に向けられた効率性の成果を達成することができる。
ジオメトリック分割ブロックモードを使用する予測の後に残る残差信号(residual signal)は、変換され、量子化され、エントロピ符号化される。MPEG−4 AVC規格のフレームワークでは、符号化マクロブロック毎に、サイズ8×8およびサイズ4×4の変換を選択することができる。ジオメトリック分割されたスーパマクロブロックにも同じことを適用することができる。しかし、一実施形態では、スーパマクロブロックにおいてより効率的なジオメトリ適応符号化モードを用いて達成されたより平滑な残差をより良く処理するために、より大きな変換を使用する可能性を具体化することができる。スーパマクロブロック毎、スーパマクロブロック内のマクロブロックパーティション毎、およびスーパマクロブロック内のマクロブロックパーティション内のサブマクロブロックパーティション毎の少なくとも1つについて、変換のサイズを選択する可能性を可能にすることができる。一実施形態では、選択できる可能な変換は、4×4、8×8、および16×16である。最終的には、別の実施形態において、32×32変換さえも検討できよう。別の例では、4×4変換および8×8変換をサポートする、MPEG−4 AVC規格における既存のシンタックスを再利用することができる。しかし、1組の可能な変換を、4×4変換および8×8変換の代わりに、すなわちシンタックスのセマンティクスを変更することによって、8×8変換および16×16変換に変更することができる。具体的には、MPEG−4 AVC規格では、以下のシンタックスセマンティクスが説明されている。
インループデブロッキングフィルタリング(in−loop de−blocking filtering)は、予測のブロック構造によって、および残差符号化MPEG−4 AVC規格変換によって導入されるブロッキングアーチファクトを低減させる。インループデブロッキングフィルタリングは、符号化ビデオデータと、ブロック境界で隔てられたピクセル間の局所強度差とに基づいて、フィルタリング強度を適合させる。一実施形態では、スーパマクロブロックがジオメトリック分割される場合、INTER32x32GEO符号化モード(すなわち4つの16×16マクロブロックの合併のジオメトリックパーティション)を有することができ、残差信号をコード化するために異なる変換サイズを使用することができる。一実施形態では、デブロッキングフィルタリングは、ジオメトリック分割されるスーパマクロブロックにおいて使用するために適合される。実際、マクロブロック境界の代わりに、スーパマクロブロック境界が、濃淡むらアーチファクト(blocky artifact)を示す可能性を有する位置であると見なされる。同時に、変換境界は、ブロッキングアーチファクトが出現し得る位置である。したがって、(16×16変換など)より大きなサイズの変換が使用される場合、すべての4×4ブロック境界および/または8×8ブロック境界の代わりに、16×16ブロック変換境界が、ブロッキングアーチファクトを示し得る。
ジオメトリック分割されたスーパマクロブロック符号化モードは、他の符号化モードに対して弁別的(distinctive)なシグナリングを必要とする。一例では、INTER32x32GEOの一般的使用は、新しい高レベルのシンタックス要素(例えば、inter32x32geo_enable)を追加することによって、可能にされ、および/または不可にされる。このシンタックス要素は、限定することなく、例えば、スライスレベル、ピクチャレベル、シーケンスレベルで、および/またはSEI(Supplemental Enhancement Information)メッセージで送ることができる。デコーダでは、inter32x32geo_enableが1に等しい場合、ジオメトリック分割されるスーパマクロブロックの使用が可能にされる。そうではなく、inter32x32geo_enableが0に等しい場合、ジオメトリック分割されたスーパマクロブロックの使用は不可とされる。
Claims (2)
- ピクチャの少なくとも部分について画像データを符号化するエンコーダであって、前記画像データは、ジオメトリックパーティションをピクチャブロックパーティションに適用するジオメトリック分割によって形成され、前記ピクチャブロックパーティションは、トップダウン分割およびボトムアップツリー結合の少なくとも一方から取得される、エンコーダを備え、
前記ジオメトリック分割は、前記画像データを符号化するために使用される、所与のビデオ符号化規格またはビデオ符号化勧告のベース分割サイズよりも大きいパーティションサイズで使用するために使用可能にされ、ベース分割サイズを有するピクチャブロックパーティションの符号化がジグザグスキャン順序に従って行われる、装置。 - ピクチャの少なくとも部分について画像データを符号化するステップであって、前記画像データは、ジオメトリックパーティションをピクチャブロックパーティションに適用するジオメトリック分割によって形成され、前記ピクチャブロックパーティションは、トップダウン分割およびボトムアップツリー結合の少なくとも一方から取得されるステップを含み、
前記ジオメトリック分割は、前記画像データを符号化するために使用される、所与のビデオ符号化規格またはビデオ符号化勧告のベース分割サイズよりも大きいパーティションサイズで使用するために使用可能にされ、ベース分割サイズを有するピクチャブロックパーティションの符号化がジグザグスキャン順序に従って行われる、方法。
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EP2373031A1 (en) * | 2008-08-12 | 2011-10-05 | Lg Electronics Inc. | Method of decoding a video signal |
US8325796B2 (en) | 2008-09-11 | 2012-12-04 | Google Inc. | System and method for video coding using adaptive segmentation |
US8503527B2 (en) | 2008-10-03 | 2013-08-06 | Qualcomm Incorporated | Video coding with large macroblocks |
US8619856B2 (en) * | 2008-10-03 | 2013-12-31 | Qualcomm Incorporated | Video coding with large macroblocks |
US9020287B2 (en) * | 2009-04-14 | 2015-04-28 | Thomson Licensing | Methods and apparatus for filter parameter determination and selection responsive to variable transforms in sparsity-based de-artifact filtering |
US9635368B2 (en) | 2009-06-07 | 2017-04-25 | Lg Electronics Inc. | Method and apparatus for decoding a video signal |
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JP5526032B2 (ja) | 2014-06-18 |
US20100208827A1 (en) | 2010-08-19 |
BRPI0818649A2 (pt) | 2015-04-07 |
JP2014132792A (ja) | 2014-07-17 |
KR20140096143A (ko) | 2014-08-04 |
WO2009051719A2 (en) | 2009-04-23 |
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