JP2012249321A - 量子化効果減少のための映像データ後処理方法 - Google Patents
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Abstract
【解決手段】逆量子化された前記映像データの逆量子化係数の分布及び以前VOPのブロックと現在VOPのブロックの差を示す動きベクトルを利用して、復号化された映像の後処理必要性可否を示すセマフォを検出するセマフォの検出段階と、検出されたセマフォを検査して後処理が必要ということを示すと、前記セマフォに相応する復号化された映像データを所定の方法によりフィルタリングするフィルタリング段階とを含むことを特徴とする。
【選択図】図1
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。
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 (4)
- 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係数を含んでいるか否かを用いて復号化された映像の隣接したブロック境界近くのブロッキングアーティファクト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、復号化された映像データを、前記セマフォの抽出結果によりディブロッキングフィルタリングを行うフィルタリング段階とを含み、
前記セマフォは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む場合フィルタリングが必要を示すようにセットし、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まない場合フィルタリングが不要を示すようにセットされ、
前記フィルタリングは前記ブロック境界の画素値の差異及び量子化パラメータQPによって強くまたは弱く行なわれる
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。 - 前記ブロック境界の画素値の差異が前記量子化パラメータQP値より小さい場合は弱いフィルタリングが行なわれる
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。 - 前記フィルタリング段階は、 抽出されたセマフォによってブロックの境界に該当するピクセルに対してブロッキングアーティファクトを減少できるようにフィルタリングする
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。 - 前記セマフォは、
水平に隣接したブロック境界近くのブロッキングアーティファクトを減少させる必要性可否を示す水平ブロッキングセマフォと、
垂直に隣接したブロック境界近くのブロッキングアーティファクトを減少させる必要性可否を示す垂直ブロッキングセマフォとを含み、
逆量子化係数のうち、
低周波成分の係数だけ“0”でないならば、水平ブロッキングセマフォと垂直ブロッキングセマフォをフィルタリングが必要を示すようにセットし、
一番上行の係数中いずれか一つでも“0”でないならば、垂直ブロッキングセマフォをフィルタリングが必要を示すようにセットし、
一番左側列の係数中いずれか一つでも“0”でないならば、水平ブロッキングセマフォを後処理必要を示すようにセットする
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。
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JP2006157938A (ja) | 2006-06-15 |
DE69837714D1 (de) | 2007-06-14 |
KR100269125B1 (ko) | 2000-10-16 |
JP2014200104A (ja) | 2014-10-23 |
EP1657934A1 (en) | 2006-05-17 |
EP1025691A2 (en) | 2000-08-09 |
WO1999022509A3 (en) | 1999-11-25 |
AU9465798A (en) | 1999-05-17 |
JP2009065716A (ja) | 2009-03-26 |
CN101188763A (zh) | 2008-05-28 |
CN1599460A (zh) | 2005-03-23 |
CN100377598C (zh) | 2008-03-26 |
US6539060B1 (en) | 2003-03-25 |
CN1214645C (zh) | 2005-08-10 |
JP5207942B2 (ja) | 2013-06-12 |
KR19990033652A (ko) | 1999-05-15 |
DE69837714T2 (de) | 2007-08-16 |
JP4828930B2 (ja) | 2011-11-30 |
EP1025691B1 (en) | 2007-05-02 |
JP2001522172A (ja) | 2001-11-13 |
EP1657933A1 (en) | 2006-05-17 |
JP5753933B2 (ja) | 2015-07-22 |
CN1281617A (zh) | 2001-01-24 |
WO1999022509A2 (en) | 1999-05-06 |
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