JP2016189635A - 色差映像復号化方法 - Google Patents
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Abstract
Description
例えば、本願発明は以下の項目を提供する。
(項目1)
色差映像を復号化する方法において、
予測ユニットの色差イントラ予測モードを誘導するステップ;
輝度変換サイズ情報を利用して現在色差ブロックのサイズを決定するステップ;
前記色差イントラ予測モードを利用して現在色差ブロックの色差予測ブロックを生成するステップ;
前記色差イントラ予測モード及び色差量子化パラメータを利用して現在色差ブロックの色差残差ブロックを生成するステップ;及び、
前記色差予測ブロックと前記色差残差ブロックを加算して色差復元ブロックを生成するステップ;を含み、
前記色差量子化パラメータは、輝度量子化パラメータ及び前記輝度量子化パラメータと前記色差量子化パラメータとの間の関係を示す情報を利用して生成されることを特徴とする方法。
(項目2)
前記輝度量子化パラメータ予測子は、輝度量子化パラメータと輝度差分量子化パラメータを利用して生成され、前記輝度量子化パラメータは、左側量子化パラメータ、上側量子化パラメータ及び以前量子化パラメータのうち、1個又は2個を利用して生成されることを特徴とする項目1に記載の方法。
(項目3)
前記左側輝度量子化パラメータと前記上側輝度量子化パラメータが両方とも利用可能な場合、前記左側及び上側輝度量子化パラメータの平均値が前記輝度量子化パラメータ予測子に設定されることを特徴とする項目2に記載の方法。
(項目4)
前記左側輝度量子化パラメータと前記上側輝度量子化パラメータのうち一つのみが利用可能な場合、前記利用可能な輝度量子化パラメータと以前量子化パラメータの平均値が前記輝度量子化パラメータ予測子に設定されることを特徴とする項目2に記載の方法。
(項目5)
前記輝度量子化パラメータは、量子化ユニット毎に生成され、前記量子化ユニットの最小サイズは、ピクチャ毎に調整されることを特徴とする項目2に記載の方法。
(項目6)
前記量子化ユニットの最小サイズは、前記量子化ユニットの最小サイズの深さ情報を特定するパラメータ及び最大コーディングユニットのサイズを利用して生成されることを特徴とする項目5に記載の方法。
(項目7)
前記差分量子化パラメータは、符号化された差分輝度量子化パラメータを算術復号化してビンストリング(bin string)を生成し、前記ビンストリングに逆二進化を適用して復元されることを特徴とする項目2に記載の方法。
Claims (8)
- 色差映像を復号化する方法であって、
予測ユニットの色差イントラ予測モードを誘導することと、
輝度変換サイズ情報を利用して色差予測ブロックのサイズを決定することと、
前記色差イントラ予測モードを利用して前記色差予測ブロックを生成することと、
前記色差イントラ予測モード及び色差量子化パラメータを利用して色差残差ブロックを生成することと、
前記色差予測ブロックと前記色差残差ブロックを加算して色差復元ブロックを生成することと
を含み、
前記色差量子化パラメータは、輝度量子化パラメータ及び前記輝度量子化パラメータと前記色差量子化パラメータとの間の関係を示す情報を利用して生成され、
前記輝度量子化パラメータは、輝度量子化パラメータ予測子と輝度差分量子化パラメータを利用して生成され、
前記輝度量子化パラメータ予測子は、左側輝度量子化パラメータ、上側輝度量子化パラメータ及び以前輝度量子化パラメータのうち予め決められた順序に決定される2個の量子化パラメータを利用して生成され、
前記輝度量子化パラメータは、量子化ユニット毎に生成され、前記量子化ユニットの最小サイズは、ピクチャパラメータセットによって調整される、方法。 - 前記左側輝度量子化パラメータと前記上側輝度量子化パラメータの両方が利用可能な場合、前記左側輝度量子化パラメータ及び前記上側輝度量子化パラメータの平均が前記輝度量子化パラメータ予測子として設定される、請求項1に記載の方法。
- 前記左側輝度量子化パラメータと前記上側輝度量子化パラメータのうち一つのみが利用可能な場合、前記利用可能な輝度量子化パラメータと前記輝度以前量子化パラメータの平均が前記輝度量子化パラメータ予測子として設定される、請求項1に記載の方法。
- 前記量子化ユニットの最小サイズは、前記量子化ユニットの最小サイズの深さを特定するパラメータ及び最大コーディングユニットのサイズを利用して誘導される、請求項1に記載の方法。
- 前記輝度差分量子化パラメータは、符号化された輝度差分量子化パラメータを算術復号化してビンストリングを生成することと、前記ビンストリングに逆二進化を適用することとにより、復元される、請求項1に記載の方法。
- 前記ビンストリングは、前記輝度差分量子化パラメータの絶対値を示すビンストリングと前記輝度差分量子化パラメータの符号を示すビンとを含む、請求項5に記載の方法。
- 前記左側輝度量子化パラメータ及び前記上側輝度量子化パラメータが利用不可能な場合、前記以前輝度量子化パラメータが前記輝度量子化パラメータ予測子として決定される、請求項1に記載の方法。
- 前記残差ブロックのサイズが予め決められたサイズより小さい場合、残差ブロック生成部が、前記色差イントラ予測モードによって決定される逆スキャンパターンを利用して色差量子化ブロックを生成し、前記色差量子化ブロックを逆変換することによって前記色差残差ブロックを生成する、請求項1に記載の方法。
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KR20130049524A (ko) * | 2011-11-04 | 2013-05-14 | 오수미 | 인트라 예측 블록 생성 방법 |
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JP5900307B2 (ja) * | 2011-12-13 | 2016-04-06 | 株式会社Jvcケンウッド | 動画像符号化装置、動画像符号化方法及び動画像符号化プログラム、並びに送信装置、送信方法及び送信プログラム |
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US10440365B2 (en) | 2013-06-28 | 2019-10-08 | Velos Media, Llc | Methods and devices for emulating low-fidelity coding in a high-fidelity coder |
US20150016516A1 (en) * | 2013-07-15 | 2015-01-15 | Samsung Electronics Co., Ltd. | Method for intra prediction improvements for oblique modes in video coding |
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