JP4828930B2 - 量子化効果減少のための映像データ後処理方法及び装置 - Google Patents
量子化効果減少のための映像データ後処理方法及び装置 Download PDFInfo
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Description
また本発明はISO/IEC JTC1/SC29/WG11 N1902(ISO/IEC 14496−2 Committee Draft)に採択された。
mage Processing, 1997] そしてブロッキングアーチファクトを減少させるために2次元フィルターを使用し、階段ノイズ減少のためには1次元フィルターを使用したRamamurthi及びGershoの方法[B. Ramamurthi and A.Gersho,”Nonlinear Space Variant Postprocessing of Block Coded Images”, IEEE Tans on ASSP,vol.34,no.5,pp1258−1267, 1986]は良い効果を示したりもした。また、コンベクスセット(convex set)への投影理論を用いる反復的映像復元アルゴリズムも提案された。[Y.Ynag,N.Galatsanos and A.Katsaggelos,”Project−ion−Based Spatially Adaptive Reconstruction of Block−Transform Compressed Images,”IEEE trans. on Image Processing,vol.4,no.7,pp 896−908,July 1995]
画素Aに対する補償値A’=(4A+B+C+2D+4)/8
画素A1に対する補償値A1’は(A’+3A1+2)/4
画素A2に対する補償値A2’は(A’+3A2+2)/4にようになることを特徴とする。前記コーナー異常値の候補画素数が2つ以上であれば(A3+B3+C3+D3+2)/4(ここでB3、C3、D3もA3と同じ方式で定義される)より最も大きい差を有する候補が選択され、その補償は前記一つの補償の場合と同じ方法で遂行される。
MPEG−4で計算数及び量子化効果の効率的な減少を遂行するために、二種類のセマフォが定義される。最初はブロッキングセマフォで、二番目はリンギングセマフォである。前記ブロッキング及びリンギングセマフォはイントラVOPで8×8ブロックのDCT領域から検出される。またインターVOPのセマフォは残差信号及び基準VOPのセマフォより計算される。
逆量子化後のDCT係数の逆量子化係数(IQC)の分布を調べてセマフォを検出する。図2はMPEG−4の復号化器に対するブロック図及び前記復号化器の逆量子化部で逆量子化された8×8DCT係数ブロックを示すことである。図2の8×8逆量子化されたブロックで、係数A、B及びCがブロッキング及びリンギングセマフォを決定する時に使われる。
前記HBS、VBS及びRSは各ブロック当3つのビットに貯蔵される。
基準VOPのブロッキングセマフォ及びリンギングセマフォは動きベクトルを使用することによて次のインターVOPに伝播される。また、インターVOPの残差信号はインターVOPのセマフォを決定する時に使われる。
一方、ディブロッキングフィルター110、コーナー異常値補償部120及びディリンギングフィルター130に対して具体的に説明する。
ブロッキングアーチファクト減少のための一次元低域通過フィルタリングは水平境界及び垂直境界上のブロッキングセマフォによって強くまたは弱く遂行される。ブロッキングアーチファクトを減らすために、大部分のディブロッキング方法は映像エッジ情報を計算し、前記映像エッジに基づいた低域通過フィルター(LPF)を適応的に適用する。しかし本発明によるディブロッキング方法は前記求めたブロッキングセマフォを利用するため、多くの計算量を要求する映像エッジ検出を必要としない。
if(ブロック−IのHBS==1 andブロック−JのHBS==1)
7−tab フィルタリング; // A、B、C、D、E and Fを変更//
else
if ( |D−C| < QP )
弱フィルタリング;; // B、C、D及びEを変更//
コーナー異常値は図7に示したようにMPEG−圧縮解除された映像の8×8ブロックのコーナーポイントで、隣る画素よりその画素値がはるかに大きいかまたは小さな画素により。図7Aで斜線の領域が4つのブロックにかけて分布され、前記斜線の領域の一つや二つの画素が隣るブロックのコーナーポイントに位置する時、コーナーポイントは図7Bに示したようにDCT係数の量子化により歪曲できる。このように歪曲されたコーナーポイントをコーナー異常値という。前記コーナー異常値はディブロッキングフィルター及びディリンギングフィルターでは除去できない。前記コーナー異常値を減らすために、まずコーナー異常値を検出し、その後に、前記検出されたコーナー異常値を補償する。図7Cはコーナー異常値検出のための簡単な座標値を記述している。ここでA、B、C及びDは8×8ブロックのコーナーポイントの画素値である。
value[0]=A; value[1]=B;
value[2]=C; value[3]=D;
Average=(A+B+C+D+2)/4;
Count=0;
for(m=0; m<4; m++)
if (|value[m]−Average| > QP)
Count++; /*候補ポイントの個数*/
ここでQPはH.263の量子化要素である。
(数1)
A’=(4A+B+C+2D+4)/8
A’1=(A’+3A1+2)/4
A’2=(A’+3A2+2)/4
各ブロックに対してディリンギングフィルターを適用する前に、RSを調べる。もし現在ブロックのRSが“1”であれば、ディリンギングフィルタリングは前記ブロックに適用される。映像の細部成分がフィルタリングにより歪曲されることを防止するために、フィルタリング前に簡単なエッジ検出が遂行される。図8A及び図8Bに示したように、エッジ検出及び2次元信号適応フィルタリング(2−D SAF)は“0”でないリンギングセマフォを有する8×8ブロックに適用される。2次元SAFは8×8ブロックの中心に位置した4×4画素に適用される。なぜなら境界画素はディブロッキングフィルターによりやんわりとなるからである。
/*水平エッジ検出*/
A1=|pixel[m][n]−pixel[m][n+1]|;
A2=|pixel[m][n]−pixel[m][n−1]|;
if (((A1>QP) and (A2>QP)) or (A1>2QP) or (A2>2QP))
Edge[m][n] = 1 ;
else { /*垂直エッジ検出*/
A1=|pixel[m][n]−pixel[m+1][n]|;
A2=|pixel[m][n]−pixel[m−1][n]|;
if (((A1>QP) and (A2>QP)) or (A1>2QP) or (A2>2QP))
Edge[m][n]=1 ;
}
高圧縮された映像データを復元する時、ブロッキングアーチファクト、コーナー異常値及びリンギングノイズのような量子化効果が発生される。本発明による後処理方法はセマフォと適応フィルターを使用することによって量子化効果を減少させる。各ブロックのブロッキング及びリンギングセマフォは後フィルタリングの計算量を減らすのに大きい助けになる。現ブロックに対するブロッキング及びリンギングセマフォを検出するためには、インターVOPの動きベクトルが使われる。
20 映像データ復号化器
100 セマフォ検出部
110 ディブロッキングフィルター
120 コーナー異常値補償部
130 ディリンギングフィルター
Claims (5)
- ブロックに基づいて圧縮符号化された映像データを復号化する時発生する量子化効果を減少させるための映像データ後処理方法において、
前記映像データのブロックの所定領域に“0”でない値を有するピクセルを含んでいるか否かを用いて復号化された映像のエッジ付近のリンギングノイズを減少させるフィルタリングの必要性可否を示すセマフォを抽出するセマフォ抽出段階と、
前記抽出されたセマフォを検査してフィルタリングが必要ということを示すと、復号化された映像のデータを前記セマフォの抽出結果によりリンギングノイズを除去するためのフィルタリングを行うフィルタリング段階とを含むことを特徴とする量子化効果減少のための映像データ後処理方法。 - 前記セマフォ抽出段階は、前記映像データのブロックに“0”でない値を有するピクセルを含んでいるブロックとそうでないブロックのセマフォを相違に抽出することを特徴とする請求項1に記載の量子化効果減少のための映像データ後処理方法。
- 逆量子化係数のうち、
低周波成分と該低周波成分の右隣及び下隣以外の係数がいずれか一つでも“0”でないならば、前記セマフォをフィルタリングが必要を示すようにセットされることを特徴とする請求項1に記載の量子化効果減少のための映像データ後処理方法。 - ブロックに基づいて圧縮符号化された映像データを復号化する時発生する量子化効果を減少させるための映像データ後処理装置において、
前記映像データのブロックの所定領域に“0”でない値を有するピクセルを含んでいるか否かを用いて復号化された映像のエッジ付近のリンギングノイズを減少させるフィルタリングの必要性可否を示すセマフォを抽出するセマフォ抽出部と、
前記抽出されたセマフォを検査してフィルタリングが必要ということを示すと、復号化された映像のデータを、前記セマフォの抽出結果によりリンギングノイズを除去するためのフィルタリングを行うフィルタとを含むことを特徴とする量子化効果減少のための映像データ後処理装置。 - 逆量子化係数のうち、
低周波成分と該低周波成分の右隣及び下隣以外の係数がいずれか一つでも“0”でないならば、前記セマフォをフィルタリングが必要を示すようにセットされることを特徴とする請求項4に記載の量子化効果減少のための映像データ後処理装置。
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KR100242636B1 (ko) * | 1996-03-23 | 2000-02-01 | 윤종용 | 블록화효과 및 링잉노이즈 감소를 위한 신호적응후처리시스템 |
DE19626985C1 (de) * | 1996-07-04 | 1998-01-02 | Siemens Ag | Verfahren und Anordnung zur Reduktion von Codierungsartefakten von blockbasierten Bildcodierungsverfahren und objektbasierten Bildcodierungsverfahren |
KR100269125B1 (ko) * | 1997-10-25 | 2000-10-16 | 윤덕용 | 양자화효과감소를위한영상데이터후처리방법및장치 |
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Also Published As
Publication number | Publication date |
---|---|
KR100269125B1 (ko) | 2000-10-16 |
CN100377598C (zh) | 2008-03-26 |
CN1214645C (zh) | 2005-08-10 |
EP1025691B1 (en) | 2007-05-02 |
JP2009065716A (ja) | 2009-03-26 |
DE69837714T2 (de) | 2007-08-16 |
CN1281617A (zh) | 2001-01-24 |
JP2001522172A (ja) | 2001-11-13 |
KR19990033652A (ko) | 1999-05-15 |
EP1657933A1 (en) | 2006-05-17 |
JP2014200104A (ja) | 2014-10-23 |
CN1599460A (zh) | 2005-03-23 |
CN101188763A (zh) | 2008-05-28 |
JP2006157938A (ja) | 2006-06-15 |
WO1999022509A2 (en) | 1999-05-06 |
JP5753933B2 (ja) | 2015-07-22 |
JP2012249321A (ja) | 2012-12-13 |
JP5207942B2 (ja) | 2013-06-12 |
DE69837714D1 (de) | 2007-06-14 |
AU9465798A (en) | 1999-05-17 |
WO1999022509A3 (en) | 1999-11-25 |
EP1025691A2 (en) | 2000-08-09 |
EP1657934A1 (en) | 2006-05-17 |
US6539060B1 (en) | 2003-03-25 |
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