JP2010022020A - 画像アップサンプリング方法およびシステム - Google Patents
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Abstract
【解決手段】画像アップサンプリング用法および画像アップサンプリングシステムは、高解像度画像のサンプル位置に対応する低解像度画像の位置の位相に基づいて選択されたフィルタ係数を用いたダイレクト補間処理を用い、H.264/MPEG-4 AVCスケーラブル映像符号化(SVC)拡張方式に適応される。
【選択図】図1
Description
テクスチャ補間処理の入力は、以下に示す通りである。
・ベース画像(baseL[x, y]) (=-2+xB..(xB1+2), y=-2+ yB..(yB1+2))
・chroma_format_idcがゼロでない場合、
・ベース画像((xCB,yCB),(xCB1,yCB1))の整数色度サンプル位置、
・ベース画像(baseCb[x,y], baseCr[x,y])(=-2 + xCB..(xCB1+2), y=-2 + yCB..(yCB1+2))
テクスチャ補間処理の出力は、以下に示す通りである。
・chroma_format_idcがゼロでない場合、
・2つの輝度サンプルマクロブロックアレイpredCb[x, y]・predCr[x, y] (x=0..MbWidthC-1, y=0..MbHeightC-1)
上記輝度サンプルマクロブロックアレイPredL[x,y] (x=0..15, y = 0..15) は、以下のように算出する。
・色度サンプル(predC[x, y]) (Cは、Cb, Cr を示し、x = 0..MbWidthC-1, y=0..MbHeightC-1を満たす)は、以下のように算出する。
〔テクスチャ補間処理工程:残差(RESIDUAL)〕
テクスチャ補間処理の入力は、以下に示す通りである。
・輝度残差サンプルアレイ(resBaseL[x, y])(x=-xB..xB1, y=yB..yB1)
・chroma_format_idcがゼロでない場合、
・ベース画像 (basePic(xCB, yCB), (xCB1, yCB1))の整数色度サンプル位置
・2つの色度サンプルアレイresBaseCb[x, y]およびresBaseCr[x, y] (x=-2 + xCB..(xCB1+2), y=yCB..yCB1。
・chroma_format_idcがゼロでない場合、
・2つの色度サンプルアレイ(resPredCb[x, y],pesPredCr[x, y]) (x=0..MbWidthC-1, y=0..MbHeightC-1))。
20 低域空間解像度画像
30 パス
33 y位置位相
34 x位置位相
40 ブロック(マクロブロック)
50 ベース空間レイヤ
51 ブロック(マクロブロック)
52 ブロック(マクロブロック)
53 ブロック(マクロブロック)
54 ブロック(マクロブロック)
55 ブロック(マクロブロック)
56 ブロック(マクロブロック)
57 ブロック(マクロブロック)
58 ブロック(マクロブロック)
59 ブロック(マクロブロック)
100 高域空間画像(エンハンスメント空間画像・エンハンスメントレイヤ画像・強調空間レイヤ)
110 Crop領域(空間領域)
140 マクロブロック
200 高低域空間解像度画像
300 パス
Claims (13)
- 低解像度画像から高解像度画像へアップサンプリングする画像アップサンプリング方法であって、
高解像度画像のサンプル位置に対応する低解像度画像の位置を算出する工程(a)と、
上記低解像度画像の位置に基づいて、第1方向の第1位置補間中心を算出する工程(b)と、
上記低解像度画像の位置に基づいて、上記第1方向の第1位置位相を算出する工程(c)と、
上記低解像度画像の位置に基づいて、第2方向の第2位置補間中心を算出する工程(d)と、
上記低解像度画像の位置に基づいて、上記第2方向の第2位置位相を算出する工程(e)と、
上記第1位置位相に基づいて、第1フィルタ係数セットを算出する工程(f)と、
上記第2位置位相に基づいて、第2フィルタ係数セットを算出する工程(g)と、
上記第1フィルタ係数セットを有する第1フィルタを用いて上記第1方向に上記低解像度画像をフィルタ処理することによって、第1フィルタ画像を生成する工程(h)と、
上記第2フィルタ係数セットを有する第2フィルタを用いて上記第2方向に上記低解像度画像をフィルタ処理することによって、第2フィルタ画像を生成する工程(i)とを含むことを特徴とする画像アップサンプリング方法。 - 上記工程(b)および工程(d)の各々は、画像サンプルの1/16の補間解像度を用いることを特徴とする請求項1に記載の画像アップサンプリング方法。
- 上記第1フィルタ係数セットを算出する工程は、ルックアップテーブルを参照する工程を含むことを特徴とする請求項1に記載の画像アップサンプリング方法。
- 上記第2フィルタ係数セットを算出する工程は、ルックアップテーブルを参照する工程を含むことを特徴とする請求項1に記載の画像アップサンプリング方法。
- 上記ルックアップテーブルは、Lanczos-windowed sinc functionの複数のサンプルを含むことを特徴とする請求項3に記載の画像アップサンプリング方法。
- 上記ルックアップテーブルは、Lanczos-windowed sinc functionの複数のサンプルを含むことを特徴とする請求項4に記載の画像アップサンプリング方法。
- 低解像度画像から高解像度画像へアップサンプリングする画像アップサンプリングシステムであって、
上記高解像度画像のサンプル位置に対応する低解像度画像の位置を算出する相対位置取得部と、
上記低解像度画像の位置に基づいて、第1方向の第1位置補間中心を算出する第1位置補間中心算出部と、
上記低解像度画像の位置に基づいて、上記第1方向の第1位置位相を算出する第1位置位相算出部と、
上記低解像度画像の位置に基づいて、第2方向の第2位置補間中心を算出する第2位置補間中心算出部と、
上記低解像度画像の位置に基づいて、上記第2方向の第2位置位相を算出する第2位置位相算出部と、
上記第1位置位相に基づいて、第1フィルタ係数セットを算出する第1フィルタ係数選択部と、
上記第2位置位相に基づいて、第2フィルタ係数セットを算出する第2フィルタ係数選択部と、
上記第1方向に上記低解像度画像をフィルタ処理することによって、第1フィルタ画像を生成する上記第1フィルタ係数セットを有する第1フィルタと、
上記第2方向に上記低解像度画像をフィルタ処理することによって、第2フィルタ画像を生成する上記第2フィルタ係数セットを有する第2フィルタと、を含むことを特徴とする画像アップサンプリングシステム。 - 上記第1位置補間中心算出部および第2位置補間中心算出部の各々は、画像サンプルの1/16の補間解像度を用いることを特徴とする請求項7に記載の画像アップサンプリングシステム。
- 上記第1フィルタ係数選択部は、ルックアップテーブルを参照して上記第1フィルタ係数セットを選択することを特徴とする請求項8に記載の画像アップサンプリングシステム。
- 上記第2フィルタ係数選択部は、ルックアップテーブルを参照して上記第2フィルタ係数セットを選択することを特徴とする請求項8に記載の画像アップサンプリングシステム。
- 上記ルックアップテーブルは、Lanczos-windowed sinc functionの複数のサンプルを含むことを特徴とする請求項9に記載の画像アップサンプリングシステム。
- 上記ルックアップテーブルは、Lanczos-windowed sinc functionの複数のサンプルを含むことを特徴とする請求項10に記載の画像アップサンプリングシステム。
- さらに、H.264/MPEG-4 AVCビデオコーディックを含むことを特徴とする請求項7に記載の画像アップサンプリングシステム。
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| US68667605P | 2005-06-01 | 2005-06-01 | |
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| US11/347,539 US8175168B2 (en) | 2005-03-18 | 2006-02-03 | Methods and systems for picture up-sampling |
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| JP5189054B2 (ja) | 2013-04-24 |
| KR20070116872A (ko) | 2007-12-11 |
| CN102075755A (zh) | 2011-05-25 |
| CN101513053B (zh) | 2011-04-06 |
| US20120213296A1 (en) | 2012-08-23 |
| US20060210185A1 (en) | 2006-09-21 |
| KR100937272B1 (ko) | 2010-01-18 |
| JP2008533908A (ja) | 2008-08-21 |
| WO2006101681A3 (en) | 2009-04-16 |
| EP1859388A2 (en) | 2007-11-28 |
| EP1859388A4 (en) | 2010-09-08 |
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