JP6073442B2 - エッジオフセットを適用する方法 - Google Patents
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- H04N19/114—Adapting the group of pictures [GOP] structure, e.g. number of B-frames between two anchor frames
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- H04N19/174—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 slice, e.g. a line of blocks or a group of blocks
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- H04N19/169—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
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- 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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- H04N19/189—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding
- H04N19/196—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters
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Description
例えば、本願発明は以下の項目を提供する。
(項目1)
エッジオフセットを適用する方法において、
現在サンプルのエッジインデックスを生成するステップ;及び、
現在サンプルに前記エッジインデックスに対応するエッジオフセットを適用するステップ;を含み、
前記エッジインデックスは、以下の式により生成され、
edgeIdx=2+sign3(recPicture(x)−recPicture(x−1))+sign3(recPicture(x)−recPicture(x+1)
ここで、sign3(y)は、y値が0より大きい場合に1であり、y値が0より小さい場合に−1であり、及びy値が0の場合に0であり、recPicture(x)は、現在サンプル値を示し、recPicture(x−1)及びrecPicture(x+1)は、2個の隣接サンプルを示すことを特徴とする方法。
(項目2)
前記2個の隣接サンプルは、現在領域のエッジオフセットタイプにより決定されることを特徴とする項目1に記載の方法。
(項目3)
前記エッジオフセットは、前記エッジインデックスに基づいて正の値又は負の値に設定されることを特徴とする項目1に記載の方法。
(項目4)
前記エッジインデックスが0又は1の場合、前記エッジオフセットは、正の値に設定されることを特徴とする項目3に記載の方法。
(項目5)
前記エッジインデックスが3又は4の場合、前記エッジオフセットは、負の値に設定されることを特徴とする項目3に記載の方法。
(項目6)
前記エッジインデックスが2の場合、前記エッジオフセットは、0に設定されることを特徴とする項目1に記載の方法。
Claims (9)
- 復元された映像を後処理する方法であって、
予測ブロックのエッジまたは変換ブロックのエッジであって8×8サンプルグリッド上に位置する4−サンプルエッジ毎に境界強度を決定するステップ;
前記境界強度及び境界量子化パラメータを利用して、前記4−サンプルエッジにデブロッキングフィルタを適用するかどうかを決定するステップ;
前記決定に従って、前記4−サンプルエッジにデブロッキングフィルタを適用するステップ;及び
サンプル適応的オフセットタイプによって、オフセットを適用するステップを含み、
前記境界量子化パラメータは、前記4−サンプルエッジの両側ブロックであるPブロックの量子化パラメータとQブロックの量子化パラメータの平均値に設定され、
前記Pブロックの量子化パラメータは、前記Pブロックの量子化パラメータ予測子及び差分量子化パラメータを利用して生成され、
前記Pブロックの量子化パラメータ予測子は、前記Pブロックの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予め決められた順序に決定される利用可能な2個の量子化パラメータの平均値に設定され、
前記左側及び上側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Pブロックの量子化パラメータ予測子は、前記利用可能な一つの量子化パラメータと前記以前量子化パラメータの平均値に設定され、
前記サンプル適応的オフセットタイプがエッジオフセットを指示する場合、前記オフセットを適用するステップは、
現在サンプルのエッジインデックスを生成するステップ;及び
前記エッジインデックスに対応するエッジオフセットを前記現在サンプルに適用するステップ;を含み、
前記エッジオフセットは、前記エッジインデックスに基づいて正の値または負の値に設定されることを特徴とする方法。 - 前記エッジインデックスは、数式edgeIdx=2+sign3(recPicture(x)−recPicture(x−1))+sign3(recPicture(x)−recPicture(x+1))により生成され、前記数式において、sign3(y)は、y値が0より大きい場合に1であり、y値が0より小さい場合に−1であり、及びy値が0の場合に0であり、recPicture(x)は、現在サンプル値を示し、recPicture(x−1)及びrecPicture(x+1)は、2個の隣接サンプルを示すことを特徴とする請求項1に記載の方法。
- 前記2個の隣接サンプルは、現在領域のエッジオフセットタイプにより決定されることを特徴とする請求項2に記載の方法。
- 前記エッジインデックスが0または1の場合、前記エッジオフセットは、正の値に設定されることを特徴とする請求項1に記載の方法。
- 前記エッジインデックスが3または4の場合、前記エッジオフセットは、負の値に設定されることを特徴とする請求項1に記載の方法。
- 前記エッジインデックスが2の場合、前記エッジオフセットは、0に設定されることを特徴とする請求項1に記載の方法。
- 前記2個の隣接サンプルのうち一つが他のLCUに属すると、現在サンプルにエッジオフセットを適用しないことを特徴とする請求項2に記載の方法。
- 前記サンプル適応的オフセットタイプは、LCU単位で決定されることを特徴とする請求項1に記載の方法。
- 前記左側及び上側量子化パラメータが両方とも利用可能でない場合、前記Pブロックの量子化パラメータ予測子は、前記以前量子化パラメータの値に設定されることを特徴とする請求項1に記載の方法。
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US (7) | US9172961B2 (ja) |
EP (5) | EP3998773A1 (ja) |
JP (6) | JP5828967B2 (ja) |
KR (3) | KR20140057391A (ja) |
CN (7) | CN107888919B (ja) |
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