JP7519411B2 - ビデオ符号化およびビデオ復号における変換の選択のための方法および装置 - Google Patents
ビデオ符号化およびビデオ復号における変換の選択のための方法および装置 Download PDFInfo
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Description
本出願は、2009年1月27日付で出願された仮出願第61/147,705号の利益を主張するものであり、その開示内容全体を本願に盛り込んだものとする。さらに、本出願は、2009年2月17日付で出願された仮出願第61/207,783号の利益を主張するものであり、その開示内容全体を本願に盛り込んだものとする。またさらに、本出願は、2つの別の出願との関連性が高い。これらの出願は、本願と同時に出願され、本願と発明者および出願人が同じであり(代理人整理番号PU090137およびPU090138)、各々の開示内容全体を本願に盛り込んだものとし、各々は、2009年1月27日付で出願された仮出願第61/147,705号および2009年2月17日付で出願された仮出願第61/207,783号の利益を主張するものである。
次に、本願において、使用されている変換のセットを決定する方法について説明する。
次に、符号化器と復号器との間で一致が確保されるように、選択された変換を復号器に示す方法について説明する。
本願発明の原理は、2つの部分、即ち、変換のセットの選択の方法、さらに、各々の特定のブロックのセットの内で選択された変換を伝達する方法に関すると考えることができる。これらの2つの部分の各々のために、幾つかの代替手段が提案される。これらの提案されたアプローチは、各々の部分のために提案された代替手段のいずれかを組み合わせることができる。また、各変換は、特定の量子化処理、さらに、エントロピー符号化に先立って、各係数の異なる走査順を必要とする場合がある。さらに、各走査順は、各変換の統計値に対して適応したものである場合がある。一つの実施形態においては、各変換の走査順は、特定の係数の位置が以前に有意なものとして符号化された回数に適応させることができる。本願発明の原理は、以下の変換の拡張を考慮している。これらは、変換の量子化処理、変換の走査順、さらに、この走査順の潜在的な適応可能性である。
Claims (14)
- 方法であって、
ピクチャ内の少なくとも1つのブロックの復号を、2種類以上の逆変換のセットから、ビデオ・シーケンスにおける前記ブロックの逆量子化された残差に適用する少なくとも1つの逆変換を決定することによって行うことを含み、
逆変換の選択は、前記ブロックの領域に対して使用するために決定することができるいくつかの逆変換の中から、前記ブロックのサイズと、前記ブロックのためにインター予測モードが使用されていないかどうかとに依存し、
前記選択は、異なる離散三角関数逆変換の間で行われ、前記逆変換は方向性の逆変換であり、前記選択は、ブロックのために予測されたデータの方向の要素に依存する、方法。 - 装置であって、
ピクチャ内の少なくとも1つのブロックのためのビデオ復号器であって、2種類以上の逆変換のセットから、ビデオ・シーケンスにおける前記ブロックの逆量子化された残差に適用する少なくとも1つの逆変換を決定するビデオ復号器を備え、
逆変換の選択は、前記ブロックの領域に対して使用するために決定することができるいくつかの逆変換の中から、前記ブロックのサイズと、前記ブロックのためにインター予測モードが使用されていないかどうかとに依存し、
前記選択は、異なる離散三角関数逆変換の間で行われ、前記逆変換は方向性の逆変換であり、前記選択は、ブロックのために予測されたデータの方向の要素に依存する、装置。 - 方法であって、
ピクチャ内の少なくとも1つのブロックの符号化を、2種類以上の変換のセットから、ビデオ・シーケンスにおける前記ブロックの残差に適用する少なくとも1つの変換を決定することによって行うことを含み、
変換の選択は、前記ブロックの領域に対して使用するために決定することができるいくつかの変換の中から、前記ブロックのサイズと、前記ブロックのためにインター予測モードが使用されていないかどうかとに依存し、
前記選択は、異なる離散三角関数変換の間で行われ、前記変換は方向性の変換であり、前記選択は、ブロックのために予測されたデータの方向の要素に依存する、方法。 - 装置であって、
ピクチャ内の少なくとも1つのブロックを符号化するためのビデオ符号化器であって、2種類以上の変換のセットから、ビデオ・シーケンスにおける前記ブロックの残差に適用する少なくとも1つの変換を決定することによって符号化を行うビデオ符号化器を備え、
変換の選択は、前記ブロックの領域に対して使用するために決定することができるいくつかの変換の中から、前記ブロックのサイズと、前記ブロックのためにインター予測モードが使用されていないかどうかとに依存し、
前記選択は、異なる離散三角関数変換の間で行われ、前記変換は方向性の変換であり、前記選択は、ブロックのために予測されたデータの方向の要素に依存する、装置。 - 前記変換のセットをオフラインで決定することをさらに含む、請求項3に記載の方法。
- (i)トレーニング・データの使用と、
(ii)変換の系列のサブセットの選択と、
のうちの少なくとも1つによって前記変換のセットが決定される、請求項3に記載の方法。 - 前記セットにおける各変換が、可分、または不可分であり、各変換が可分である場合に、各変換の水平方向および垂直方向を異ならせることができる、請求項3に記載の方法。
- 閾値のブロック・サイズより大きなブロック・サイズについてのみ、前記選択された変換を記述する情報が明示的に信号送信される、請求項3に記載の方法。
- ブロック・サイズが閾値のブロック・サイズよりも小さい場合に、前記選択された変換を記述するフラグが前記変換の係数に埋め込まれる、請求項3に記載の方法。
- 閾値のブロック・サイズより大きなブロック・サイズについてのみ、前記選択された変換を記述する情報が明示的に信号送信される、請求項4に記載の装置。
- ブロック・サイズが閾値のブロック・サイズよりも小さい場合に、前記選択された変換を記述するフラグが前記変換の係数に埋め込まれる、請求項4に記載の装置。
- 前記セットにおける各変換が、可分、または不可分であり、各変換が可分である場合に、各変換の水平方向および垂直方向を異ならせることができる、請求項1に記載の方法。
- 非一時的なコンピュータ可読記憶媒体であって、命令を含み、前記命令は、プロセッサによって実行されると請求項1に記載の方法を実行する、非一時的なコンピュータ可読記憶媒体。
- 非一時的なコンピュータ可読記憶媒体であって、命令を含み、前記命令は、プロセッサによって実行されると請求項3に記載の方法を実行する、非一時的なコンピュータ可読記憶媒体。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14770509P | 2009-01-27 | 2009-01-27 | |
US61/147,705 | 2009-01-27 | ||
US20778309P | 2009-02-17 | 2009-02-17 | |
US61/207,783 | 2009-02-17 | ||
JP2020124479A JP2020191647A (ja) | 2009-01-27 | 2020-07-21 | ビデオ符号化およびビデオ復号における変換の選択のための方法および装置 |
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