JP5053081B2 - ビデオ・コーデック量子化のための方法および装置 - Google Patents
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Description
本出願は、2004年6月18日に出願された米国特許仮出願第60/581019号の利益を請求する。
ビデオ・エンコーダおよびデコーダにおける量子化のための方法および装置を対象とする本発明によって、従来技術のこれらや他の欠点および不利益に対処する。
であると仮定すると、このレベルの周りの分布エリアを計算することができる。これは、分布の正確な統計を考慮することによって、あるいはモデルベースの方法を使用することによって(例えばラプラスまたはガウス分布モデルの使用)行うことができる。所与の分布領域について最適な量子化点を決定するための通常の方法では、分布のほぼ中央点(すなわち分布を2つの等サイズのエリア
に分割する点)として選択することができる。この中央点は、区分的分布がほぼ区分的線形であると仮定することによる近似であることに留意されたい。より正確な方策は、ロイド・マックス(Lloyd Max)法を使用して、誤差を最小限にする点を見つけることである。区分的線形分布を作ることにより、以下のように直角台形(すなわち2つの直角を有する台形)からのプロパティを使用して(図17に見ることができる)f2を計算することができる。
が選択されるが、これは最適ではないものの十分によい解である。x−=2×f2であり、x+=2×(1−f2)であることに留意されたい。この方法は、係数を主観的に最適化する前述の方法と組み合わせてもよいが、ただしその場合は、そのプロセスにおける
Claims (2)
- 画像ブロックについてのビデオ信号データを符号化するためのエンコーダであって、
前記画像ブロックについての変換係数を受け取って、
準備丸めパラメータを用いて変換係数を準備量子化レベルに量子化し、
対応する準備量子化レベルがレベル0であるときに、前記準備丸めパラメータとは異なる丸めパラメータを使用することによって、前記変換係数の少なくともいくつかを対応する準備量子化レベルより高い量子化レベルに量子化して主観的品質を改善する
ための量子化器を備える、前記エンコーダ。 - 画像ブロックについてのビデオ信号データを符号化する方法であって、
前記画像ブロックについての変換係数を受け取るステップと、
準備丸めパラメータを用いて変換係数を準備量子化レベルに量子化するステップと、
対応する準備量子化レベルがレベル0であるときに、前記準備丸めパラメータとは異なる丸めパラメータを使用することによって、前記変換係数の少なくともいくつかを対応する準備量子化レベルより高い量子化レベルに量子化して主観的品質を改善するステップと、
を含む、前記方法。
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US58101904P | 2004-06-18 | 2004-06-18 | |
US60/581,019 | 2004-06-18 | ||
PCT/US2005/019647 WO2006007279A2 (en) | 2004-06-18 | 2005-06-03 | Method and apparatus for video codec quantization |
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JP2011127460A Division JP5204269B2 (ja) | 2004-06-18 | 2011-06-07 | ビデオ・コーデック量子化のための方法および装置 |
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JP2008503918A JP2008503918A (ja) | 2008-02-07 |
JP2008503918A5 JP2008503918A5 (ja) | 2008-07-10 |
JP5053081B2 true JP5053081B2 (ja) | 2012-10-17 |
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JP2011127460A Active JP5204269B2 (ja) | 2004-06-18 | 2011-06-07 | ビデオ・コーデック量子化のための方法および装置 |
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US (1) | US8542731B2 (ja) |
EP (1) | EP1766988A2 (ja) |
JP (2) | JP5053081B2 (ja) |
KR (1) | KR101320260B1 (ja) |
CN (2) | CN1973547A (ja) |
WO (1) | WO2006007279A2 (ja) |
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2005
- 2005-06-03 WO PCT/US2005/019647 patent/WO2006007279A2/en not_active Application Discontinuation
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- 2005-06-03 KR KR1020127007669A patent/KR101320260B1/ko active IP Right Grant
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Also Published As
Publication number | Publication date |
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CN102595131B (zh) | 2015-02-04 |
CN102595131A (zh) | 2012-07-18 |
WO2006007279A3 (en) | 2006-05-11 |
JP2011223607A (ja) | 2011-11-04 |
JP5204269B2 (ja) | 2013-06-05 |
US8542731B2 (en) | 2013-09-24 |
KR101320260B1 (ko) | 2013-10-23 |
US20080080615A1 (en) | 2008-04-03 |
EP1766988A2 (en) | 2007-03-28 |
JP2008503918A (ja) | 2008-02-07 |
KR20120031530A (ko) | 2012-04-03 |
WO2006007279A2 (en) | 2006-01-19 |
CN1973547A (zh) | 2007-05-30 |
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