JP2017017742A - 映像復号化方法及び装置 - Google Patents
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Abstract
【解決手段】本発明による映像復号化方法は、現在ブロックのイントラ予測モードグループ指示子及び予測モードインデックスを復元し、現在ブロックの左側及び上側ブロックの有効なイントラ予測モードを利用して第1のグループを構成し、前記イントラ予測モードグループ指示子が示すグループ内で、前記予測モードインデックスに対応するイントラ予測モードを現在ブロックのイントラ予測モードに決定し、前記予測ブロックの大きさは、変換大きさ情報によって決定されることを特徴とする。したがって、現在ブロックの左側及び上側ブロックの有効なイントラ予測モードによって現在ブロックのイントラ予測モードと同じ可能性が高いモードを第1のグループに含ませ、イントラ予測モードグループ指示子と予測モードインデックスを決定することで、符号化するイントラ予測モードの情報量を減らすことができる。
【選択図】図2
Description
本願明細書は、例えば、以下の項目も提供する。
(項目1)
現在ブロックのイントラ予測モードグループ指示子及び予測モードインデックスを復元するステップ;
現在ブロックの左側及び上側ブロックの有効なイントラ予測モードを利用して第1のグループ(MPMグループ)を構成するステップ;
前記イントラ予測モードグループ指示子が第1のグループを示す場合、前記第1のグループで前記予測モードインデックスに対応するイントラ予測モードを現在ブロックのイントラ予測モードに決定し、前記イントラ予測モードグループ指示子が第2のグループを示す場合、前記第2のグループで前記予測モードインデックスに対応するイントラ予測モードを現在ブロックのイントラ予測モードに決定するステップ;及び、
前記決定された現在ブロックのイントラ予測モードによって予測ブロックを生成するステップ;を含み、
前記予測ブロックの大きさは、変換大きさ情報によって決定されることを特徴とする映像復号化方法。
(項目2)
現在ブロックの上側及び左側ブロックのイントラ予測モードのうち一つのみが有効な場合、2個のイントラ予測モードが前記第1のグループに追加されることを特徴とする項目1に記載の映像復号化方法。
(項目3)
前記イントラ予測モードグループ指示子が第1のグループを示す場合、前記予測モードインデックスは、truncated unary方式(詳細な説明では、truncated Exp−Golomb code)に二進化されてエントロピー符号化されることを特徴とする項目2に記載のイントラ予測情報符号化方法。
(項目4)
前記追加される2個のイントラ予測モードは、前記有効なイントラ予測モードによって決定されることを特徴とする項目3に記載の映像復号化方法
(項目5)
現在ブロックの大きさが前記予測ブロックの大きさより大きい場合、前記現在ブロックに含まれる複数個の予測ブロックは、前記現在ブロックのイントラ予測モードを利用して生成されることを特徴とする項目2に記載の映像復号化方法。
(項目6)
前記複数個の予測ブロックのうち、復号化順序上、二番目以後の予測ブロックは、先行する予測ブロックを利用して復元されたブロックの画素のうち一部を参照画素として利用して生成されることを特徴とする項目5に記載の映像復号化方法。
Claims (4)
- 映像復号化方法であって、
前記映像復号化方法は、
予測ユニットのイントラ予測モードグループ指示子及び予測モードインデックスを復元することと、
前記予測ユニットの左側及び上側ブロックの有効なイントラ予測モードを利用して、3個のイントラ予測モードを含む第1のグループを構成することと、
前記イントラ予測モードグループ指示子が前記第1のグループを示す場合、前記第1のグループで前記予測モードインデックスに対応するイントラ予測モードを、前記予測ユニットのイントラ予測モードとして決定することと、
前記イントラ予測モードグループ指示子が前記第1のグループを示さない場合、前記3個のイントラ予測モード及び前記予測モードインデックスを利用して、前記予測モードインデックスに対応するイントラ予測モードを決定することと、
前記予測ユニットの大きさが予測ブロックの大きさと同じである場合、前記決定されたイントラ予測モードに基づいて、一つの予測ブロックを生成し、前記予測ユニットの大きさが前記予測ブロックの大きさより大きい場合、前記決定されたイントラ予測モードに基づいて、複数個の予測ブロックを生成することと
を含み、
前記予測ブロックの大きさは、変換大きさ情報によって決定され、
前記左側ブロックのイントラ予測モードが前記上側ブロックのイントラ予測モードと同じでなく、且つ、前記左側ブロックのイントラ予測モード及び前記上側ブロックのイントラ予測モードの両方が非方向性イントラ予測モードである場合、前記第1のグループは、前記左側及び上側ブロックのイントラ予測モード及び垂直モードを含む、映像復号化方法。 - 現在ブロックの左側及び上側ブロックのイントラ予測モードのうち一つのみが有効な場合、2個のイントラ予測モードが前記第1のグループに追加され、前記2個のイントラ予測モードは、前記有効なイントラ予測モードによって決定される、請求項1に記載の映像復号化方法。
- 前記複数個の予測ブロックのうち、復号化順序上、二番目以後の予測ブロックは、先行する予測ブロックを利用して復元されたブロックの画素のうち一部を参照画素として利用して生成される、請求項1に記載の映像復号化方法。
- 前記非方向性イントラ予測モードは、プラナーモード及びDCモードであり、モード番号0が前記プラナーモードに割り当てられ、モード番号1が前記DCモードに割り当てられる、請求項1に記載の映像復号化方法。
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| JP2016176370A Active JP6685208B2 (ja) | 2011-10-24 | 2016-09-09 | 映像復号化方法及び装置 |
| JP2018097924A Active JP6660074B2 (ja) | 2011-10-24 | 2018-05-22 | 映像復号化方法及び装置 |
| JP2020018397A Active JP6974516B2 (ja) | 2011-10-24 | 2020-02-06 | 復元ブロック生成方法、予測情報符号化方法、ビットストリーム、コンピュータ可読媒体 |
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| US11284072B2 (en) | 2010-08-17 | 2022-03-22 | M&K Holdings Inc. | Apparatus for decoding an image |
| RS61146B1 (sr) * | 2011-10-24 | 2020-12-31 | Innotive Ltd | Postupak i aparat za dekodiranje slike |
| PT3917147T (pt) * | 2011-10-24 | 2025-10-16 | Gensquare Llc | Aparelho de descodificação de imagem |
| KR20130049523A (ko) * | 2011-11-04 | 2013-05-14 | 오수미 | 인트라 예측 블록 생성 장치 |
| KR20130049525A (ko) * | 2011-11-04 | 2013-05-14 | 오수미 | 잔차 블록 복원을 위한 역변환 방법 |
| KR20130049526A (ko) | 2011-11-04 | 2013-05-14 | 오수미 | 복원 블록 생성 방법 |
| KR20130049522A (ko) * | 2011-11-04 | 2013-05-14 | 오수미 | 인트라 예측 블록 생성 방법 |
| CN103220506B (zh) | 2012-01-19 | 2015-11-25 | 华为技术有限公司 | 一种编解码方法和设备 |
| US20160373742A1 (en) * | 2015-06-18 | 2016-12-22 | Qualcomm Incorporated | Intra prediction and intra mode coding |
| US10142627B2 (en) * | 2015-06-18 | 2018-11-27 | Qualcomm Incorporated | Intra prediction and intra mode coding |
| US20160373782A1 (en) * | 2015-06-18 | 2016-12-22 | Qualcomm Incorporated | Intra prediction and intra mode coding |
| US10841593B2 (en) * | 2015-06-18 | 2020-11-17 | Qualcomm Incorporated | Intra prediction and intra mode coding |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020050684A1 (ko) * | 2018-09-07 | 2020-03-12 | 김기백 | 인트라 예측을 이용한 영상 부호화/복호화 방법 및 장치 |
| US11477439B2 (en) | 2018-09-07 | 2022-10-18 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for video signal processing |
| US12137206B2 (en) | 2018-09-07 | 2024-11-05 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for video signal processing |
| US12137205B2 (en) | 2018-09-07 | 2024-11-05 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for video signal processing |
| US12143571B2 (en) | 2018-09-07 | 2024-11-12 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for video signal processing |
| US12143570B2 (en) | 2018-09-07 | 2024-11-12 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for video signal processing |
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