JP2013524678A - 変換及び逆変換に基づいた補間方法及び装置 - Google Patents
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Abstract
Description
図10は、本発明の一実施形態による映像補間装置900の2次元補間方法を説明するための図面である。図10を参照すれば、映像補間装置900は、空間ドメインの整数ピクセル単位のピクセル値、すなわち、所定ブロック1000の‘O’位置のピクセル値間を補間して、補間位置である‘X’位置のピクセル値を生成する。‘X’位置のピクセル値は、αx及びαyによって補間位置が定められる分数ピクセル単位のピクセル値である。図10は、所定のブロック1000が4×4である場合を例として説明するが、ブロックのサイズは4×4に限定されず、さらに大きいかまたはさらに小さなサイズのブロックに対して2次元離散コサイン変換及び2次元逆離散コサイン変換を行って分数ピクセル単位のピクセル値を生成できるということは、当業者が容易に分かる。
図12は、本発明の一実施形態による1次元補間の例を示す。図12を参照すれば、映像補間装置900は、空間ドメインの整数ピクセル単位のピクセル値1210及び1220の間を補間して補間位置のピクセル値1200を生成する。αによって補間位置が定められる分数ピクセル単位のピクセル値1200である。図13を参照して詳細に説明する。
数式(4)に関して前述したように、
数式(7)による1次元離散コサイン変換を行列式で表現すれば、次の数式(13)の通りである。
フィルタ係数が所定のスケーリングファクターによってスケーリングされる場合には、数式(19)による量子化は、次の数式(20)のように修正される。
先ず、映像補間装置1400のフィルタ選択部1410は、整数ピクセル単位のピクセル値1900ないし1906の間に存在する分数ピクセル単位のピクセル値1910、1920、1930及び1940を生成するための1次元補間フィルタを選択する。図14に関して前述したように、補間位置によって異なるフィルタが選択される。例えば、上部に位置している二つのピクセル値1900及び1902の間のピクセル値1910を補間するためのフィルタは、分数ピクセル単位のピクセル値1912、1914及び1916それぞれに対して異なって選択されうる。1/2ピクセル単位のピクセル値1914を生成するためのフィルタと、1/4ピクセル単位のピクセル値1912及び1916とを生成するためのフィルタとが異なる。また、同じ1/4ピクセル単位のピクセル値1912及び1916も異なるフィルタに基づいて生成される。図14に関して前述したように、それぞれの補間位置ごとに逆変換のための基底関数の位相変更程度が異なるので、補間のために選択されるフィルタも異なる。
Claims (11)
- 映像を補間する方法において、
複数の異なるフィルタのうち、整数ピクセル単位のピクセル値間を補間するための第1フィルタを補間位置によって選択する段階と、
前記選択された第1フィルタを用いて、前記整数ピクセル単位のピクセル値間を補間して、少なくとも一つの分数ピクセル単位のピクセル値を生成する段階と、を含むことを特徴とする映像補間方法。 - 前記複数の異なるフィルタのうち、前記生成された少なくとも一つの分数ピクセル単位のピクセル値間を補間するための第2フィルタを補間位置によって選択する段階と、
前記第2フィルタを用いて、前記少なくとも一つの分数ピクセル単位のピクセル値間を補間する段階と、をさらに含むことを特徴とする請求項1に記載の映像補間方法。 - 前記第1フィルタは、
異なる周波数の複数の基底関数を用いて、前記整数ピクセル単位のピクセル値を変換し、位相変更された複数の基底関数を用いて、前記変換結果として生成された複数の係数を逆変換するための空間ドメインのフィルタであることを特徴とする請求項2に記載の映像補間方法。 - 前記第2フィルタは、
異なる周波数の複数の基底関数を用いて、前記生成された少なくとも一つの分数ピクセル単位のピクセル値を変換し、位相変更された複数の基底関数を用いて、前記変換結果として生成された複数の係数を逆変換するための空間ドメインのフィルタであることを特徴とする請求項3に記載の映像補間方法。 - 映像を補間する装置において、
複数の異なるフィルタのうち、整数ピクセル単位のピクセル値間を補間するための第1フィルタを補間位置によって選択するフィルタ選択部と、
前記選択された第1フィルタを用いて、前記整数ピクセル単位のピクセル値間を補間して少なくとも一つの分数ピクセル単位のピクセル値を生成する補間部と、を備えることを特徴とする映像補間装置。 - 前記フィルタ選択部は、前記複数の異なるフィルタのうち、前記生成された少なくとも一つの分数ピクセル単位のピクセル値間を補間するための第2フィルタを補間位置によって選択し、
前記補間部は、前記選択された分数ピクセル単位のピクセル値間を補間するためのフィルタに基づいて、前記生成された少なくとも一つの分数ピクセル単位のピクセル値間を補間することを特徴とする請求項5に記載の映像補間装置。 - 前記第1フィルタは、
異なる周波数の複数の基底関数を用いて、前記整数ピクセル単位のピクセル値を変換し、位相変更された複数の基底関数を用いて、前記変換結果として生成された複数の係数を逆変換するための空間ドメインのフィルタであることを特徴とする請求項6に記載の映像補間装置。 - 前記第2フィルタは、
異なる周波数の複数の基底関数を用いて、前記生成された少なくとも一つの分数ピクセル単位のピクセル値を変換し、位相変更された複数の基底関数を用いて、前記変換結果として生成された複数の係数を逆変換するための空間ドメインのフィルタであることを特徴とする請求項7に記載の映像補間装置。 - 請求項1に記載の方法を行うためのプログラムを記録したコンピュータで読み取り可能な記録媒体。
- 前記選択されたフィルタの係数をスケーリングファクターほど乗じることで前記選択されたフィルタがスケールされ、
前記少なくとも一つの分数ピクセル単位のピクセル値を生成する段階は、前記スケールされた、選択されたフィルタを用いて、前記整数ピクセル単位のピクセル値間を補間する段階を含むことを特徴とする請求項1に記載の映像補間方法。 - 前記第1フィルタを選択する段階は、
前記補間位置、及び前記整数ピクセル単位を含むブロックのサイズと、前記補間のためのフィルタリングの方向のうち少なくとも一つに基づいて、前記第1フィルタを選択する段階を含むことを特徴とする請求項1に記載の映像補間方法。
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US61/367,498 | 2010-07-26 | ||
KR10-2010-0095956 | 2010-10-01 | ||
KR1020100095956A KR101682147B1 (ko) | 2010-04-05 | 2010-10-01 | 변환 및 역변환에 기초한 보간 방법 및 장치 |
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