JP6388690B2 - クアッドツリー構造に基づく適応的量子化パラメータ符号化及び復号化方法及び装置 - Google Patents
クアッドツリー構造に基づく適応的量子化パラメータ符号化及び復号化方法及び装置 Download PDFInfo
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- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/13—Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
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- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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Description
Claims (2)
- 1つの量子化差分値を有する第1ブロックを決定する量子化差分値記録ブロック単位決定部と、
ここで、前記第1ブロックが前記量子化差分値を有すると決定されるとき、変数の値が0に初期化され、
前記第1ブロックが4つのサブブロックに分割されるとき、前記量子化差分値は前記第1ブロック内の第1サブブロックのためにデコードされ、
前記量子化差分値が第1サブブロックのためにデコードされるとき、前記変数の前記値が1に変化され、
前記変数が1に設定された後で、前記量子化差分値は、前記第1ブロック内の他のサブブロックのためにデコードされず、
逆量子化パラメータ値予測に使われる複数の第2ブロックを決定し、決定された前記第2ブロックに基づいて予測された逆量子化パラメータ値を決定する逆量子化パラメータ値予測ブロック決定部と、
前記量子化差分値と予測された前記逆量子化パラメータ値とを用いて逆量子化パラメータ値を求める逆量子化パラメータ値導出部と、
求められた前記逆量子化パラメータ値を用いて、前記第1ブロックの逆量子化を実行する逆量子化部と、
を備え、
前記第2ブロックは、前記第1ブロックの左に隣接するブロックおよび前記第1ブロックの上に隣接するブロックを含み、
前記左に隣接するブロックは、前記第1ブロックの左側に隣接する複数のブロックのうち最も上のブロックであり、
前記上に隣接するブロックは、前記第1ブロックの上側に隣接する複数のブロックのうち最も左のブロックであることを特徴とする映像復号化装置。 - 前記予測された前記逆量子化パラメータ値は、前記左に隣接するブロック及び前記上に隣接するブロックに関連する量子化パラメータ値の平均値に決定されることを特徴とする請求項1に記載の映像復号化装置。
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KR20110060058A KR101442127B1 (ko) | 2011-06-21 | 2011-06-21 | 쿼드트리 구조 기반의 적응적 양자화 파라미터 부호화 및 복호화 방법 및 장치 |
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JP2018196147A (ja) * | 2011-06-21 | 2018-12-06 | インテレクチュアル ディスカバリー カンパニー リミテッド | クアッドツリー構造に基づく適応的量子化パラメータ符号化及び復号化方法及び装置 |
USRE49330E1 (en) | 2011-06-21 | 2022-12-06 | Dolby Laboratories Licensing Corporation | Method and apparatus for adaptively encoding and decoding a quantization parameter based on a quadtree structure |
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