JP5596884B2 - フィルタリング方法およびフィルタリング装置 - Google Patents
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Description
・p0’iおよびq0’iに対する(弱い)フィルタリング
・p1’iおよびq1’iのフィルタリングの際にも値Δ1を使用
以上のように、Δの値をできる限り正確に算出することは有利である。
delta1 = (9*(q0−p0) −3*(q1−p1)+8)>>4
if (delta1>tc)
{
delta1=tc;
}
else if (delta1<−tc)
{
delta1=−tc;
}
delta1 = (9*(q0−p0) −3*(q1−p1)+8)>>4
if (delta1>0)
{
if (delta1>tc)
{
delta1=tc;
}
}
else
{
if (delta1<−tc)
{
delta1=−tc;
}
}
delta = 9*(q0−p0) −3*(q1−p1)
if (delta>0)
{
delta1=(delta+a)>>4;
if (delta1>tc)
{
delta1=tc;
}
}
else
{
delta1=(delta+b)>>4;
if (delta1<−tc)
{
delta1=−tc;
}
}
上述したように、デブロッキングフィルタリングを行う際、整数処理により、効率損失および/または品質損失が生じる可能性があり、デブロッキング処理により、追加の量子化誤差が生じる可能性がある。
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 6, 6, 7, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14
} ;
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64
};
図12は、コンテンツ配信サービスを実現するコンテンツ供給システムex100の全体構成を示す図である。通信サービスの提供エリアを所望の大きさに分割し、各セル内にそれぞれ固定無線局である基地局ex106、ex107、ex108、ex109、ex110が設置されている。
上記各実施の形態で示した動画像符号化方法または装置と、MPEG−2、MPEG4−AVC、VC−1など異なる規格に準拠した動画像符号化方法または装置とを、必要に応じて適宜切替えることにより、映像データを生成することも可能である。
上記各実施の形態で示した動画像符号化方法および装置、動画像復号化方法および装置は、典型的には集積回路であるLSIで実現される。一例として、図26に1チップ化されたLSIex500の構成を示す。LSIex500は、以下に説明する要素ex501、ex502、ex503、ex504、ex505、ex506、ex507、ex508、ex509を備え、各要素はバスex510を介して接続している。電源回路部ex505は電源がオン状態の場合に各部に対して電力を供給することで動作可能な状態に起動する。
上記各実施の形態で示した動画像符号化方法または装置によって生成された映像データを復号する場合、従来のMPEG−2、MPEG4−AVC、VC−1などの規格に準拠する映像データを復号する場合に比べ、処理量が増加することが考えられる。そのため、LSIex500において、従来の規格に準拠する映像データを復号する際のCPUex502の駆動周波数よりも高い駆動周波数に設定する必要がある。しかし、駆動周波数を高くすると、消費電力が高くなるという課題が生じる。
テレビや、携帯電話など、上述した機器・システムには、異なる規格に準拠する複数の映像データが入力される場合がある。このように、異なる規格に準拠する複数の映像データが入力された場合にも復号できるようにするために、LSIex500の信号処理部ex507が複数の規格に対応している必要がある。しかし、それぞれの規格に対応する信号処理部ex507を個別に用いると、LSIex500の回路規模が大きくなり、また、コストが増加するという課題が生じる。
Claims (2)
- 画像に含まれるブロックに対してデブロックフィルタ処理を行うフィルタリング方法であって、
前記ブロックと、前記ブロックに隣接する隣接ブロックとの境界に対して、強いフィルタ又は弱いフィルタのいずれを適用するかを決定する決定ステップと、
前記ブロックの画素及び前記隣接ブロックの画素の線形結合を算出する算出ステップと、
前記線形結合を、予め定められたビット数で右へシフト演算するシフトステップと、
前記シフト演算された線形結合をクリッピングすることにより、フィルタされた前記ブロックの画素を生成するクリッピングステップと、を含み、
前記クリッピングステップでは、
前記境界に前記強いフィルタを適用する場合には、第1クリッピングパラメータにより設定される第1クリッピング範囲で前記線形結合をクリッピングし、
前記境界に前記弱いフィルタを適用する場合には、他の条件によらず常に、第2クリッピングパラメータにより設定される第2クリッピング範囲で前記線形結合をクリッピングし、
前記第1クリッピングパラメータと前記第2クリッピングパラメータは共に前記境界の強度に依存するが、それぞれから設定される前記第1クリッピング範囲及び前記第2クリッピング範囲は互いに相異なる、
フィルタリング方法。 - 画像に含まれるブロックに対してデブロックフィルタ処理を行うフィルタリング装置であって、
前記ブロックと、前記ブロックに隣接する隣接ブロックとの境界に対して、強いフィルタ又は弱いフィルタのいずれを適用するかを決定する決定部と、
前記ブロックの画素及び前記隣接ブロックの画素の線形結合を算出する算出部と、
前記線形結合を、予め定められたビット数で右へシフト演算するシフト部と、
前記シフト演算された線形結合をクリッピングすることにより、フィルタされた前記ブロックの画素を生成するクリッピング部と、を含み、
前記クリッピング部は、
前記境界に前記強いフィルタを適用する場合には、第1クリッピングパラメータにより設定される第1クリッピング範囲で前記線形結合をクリッピングし、
前記境界に前記弱いフィルタを適用する場合には、他の条件によらず常に、第2クリッピングパラメータにより設定される第2クリッピング範囲で前記線形結合をクリッピングし、
前記第1クリッピングパラメータと前記第2クリッピングパラメータは共に前記境界の強度に依存するが、それぞれから設定される前記第1クリッピング範囲及び前記第2クリッピング範囲は互いに相異なる、
フィルタリング装置。
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AU2014339383B2 (en) | 2013-10-25 | 2017-03-30 | Mediatek Inc. | Method and apparatus for controlling transmission of compressed picture according to transmission synchronization events |
CN106029787B (zh) | 2014-02-19 | 2018-04-06 | 大日精化工业株式会社 | 近红外线反射‑透射性偶氮颜料、近红外线反射‑透射性偶氮颜料的制造方法、使用了这些偶氮颜料的着色剂组合物、物品的着色方法和着色物品 |
US20160165238A1 (en) * | 2014-12-09 | 2016-06-09 | Vixs Systems Inc. | Neighbor tile buffering for deblock filtering across tile boundaries |
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