JP2010171476A - 画像処理装置および画像変換装置 - Google Patents
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Abstract
【解決手段】トランスコーダ1は、MPEG2デコーダ2、強度判定回路3、H.264エンコーダ4を備える。強度判定回路3は、MPEG2デコーダ2で取得された画像特徴量パラメータ103に基づいてフィルタ強度パラメータ104を算出する。H.264エンコーダ4は、符号化過程においてフィルタ強度パラメータ104に基づいて入力画像にデブロッキングフィルタを施す。H.264エンコーダ4においてあるピクチャの符号化処理が実行されている間、強度判定回路3において後続のピクチャのフィルタ強度算出処理が平行して実行される。
【選択図】図6
Description
まず、ピクチャ・アクティビティ値act_picの算出方法について説明する。数(1)式に示すように、MPEG2デコーダ2は、まず、デコード画像reconを算出する。
再び、図1を参照する。強度判定回路3は、MPEG2デコーダ2が格納した画像特徴量パラメータ103をDRAM5から読み出す。強度判定回路3は、画像特徴量パラメータ103に含まれるピクチャ・アクティビティ値act_picおよびピクチャ・動き評価値sad_picを利用して、フィルタ強度パラメータ104を算出する。
P1=disable_deblocking_filter_idc
P2=slice_alpha_c0_offset_div2
P3=slice_beta_offset_div2
図6は、本実施の形態のトランスコーダ1の処理シーケンスを示す図である。図中、1段目は、MPEG2デコーダ2により実行されるMPEG2ストリーム101の復号処理シーケンスを示す。図中、2段目は、強度判定回路3により実行されるフィルタ強度パラメータ104の算出処理シーケンスを示す。図中、3段目は、H.264エンコーダ4により実行されるH.264ストリーム105の符号化処理シーケンスを示す。
上記実施の形態においては、MPEG2ストリームをH.264ストリームに変換するトランスコーダを例に説明した。たとえば、本発明をH.264トランスレータに適用させることもできる。この場合、入力ストリームのフィルタ強度パラメータをそのままエンコーダで使用することもできるが、入力ストリームから取得した強度パラメータと、本発明の方法により求めたフィルタ強度とを総合評価して最適化した強度パラメータを決定するようにしてもよい。
2 MPEG2デコーダ
3 強度判定回路
4 H.264エンコーダ
101 MPEG2ストリーム
102 復号画像
103 画像特徴量パラメータ
104 フィルタ強度パラメータ
105 H.264ストリーム
Claims (4)
- 入力画像の画像特徴量からフィルタ強度を算出する強度判定回路と、
前記入力画像を符号化処理し、符号化ストリームを出力する符号化回路と、
を備え、
前記符号化回路は、
符号化処理過程において生成される画像に、前記フィルタ強度に基づいてデブロッキングフィルタ処理を施すフィルタ部、
を含み、
前記強度判定回路における前記フィルタ強度の算出処理と前記符号化回路における符号化処理とが並列的に実行されることを特徴とする画像処理装置。 - 請求項1に記載の画像処理装置において、
前記フィルタ部は、
カレントピクチャについて算出された前記フィルタ強度と、過去のピクチャについて算出された前記フィルタ強度とを入力パラメータとする演算式を用いることで、カレントピクチャに適用させる前記フィルタ強度を補正するフィルタ強度補正部、
を含むことを特徴とする画像処理装置。 - 入力した第1符号化ストリームを復号し、復号画像を出力する復号回路と、
前記復号画像の画像特徴量からフィルタ強度を算出する強度判定回路と、
前記復号画像を符号化処理し、第2符号化ストリームを出力する符号化回路と、
を備え、
前記符号化回路は、
符号化処理過程において生成される画像に、前記フィルタ強度に基づいてデブロッキングフィルタ処理を施すフィルタ部、
を含み、
前記強度判定回路における前記フィルタ強度の算出処理と前記符号化回路における符号化処理とが並列的に実行されることを特徴とする画像変換装置。 - 請求項3に記載の画像変換装置において、
前記フィルタ部は、
カレントピクチャについて算出された前記フィルタ強度と、過去のピクチャについて算出された前記フィルタ強度とを入力パラメータとする演算式を用いることで、カレントピクチャに適用させる前記フィルタ強度を補正するフィルタ強度補正部、
を含むことを特徴とする画像変換装置。
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JP2009009473A JP5435452B2 (ja) | 2009-01-20 | 2009-01-20 | 画像処理装置および画像変換装置 |
US13/142,340 US8818123B2 (en) | 2009-01-20 | 2009-03-24 | Image processing apparatus and image conversion apparatus |
PCT/JP2009/055830 WO2010084628A1 (ja) | 2009-01-20 | 2009-03-24 | 画像処理装置および画像変換装置 |
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EP3529986A1 (en) * | 2016-12-23 | 2019-08-28 | Huawei Technologies Co., Ltd. | Low complexity mixed domain collaborative in-loop filter for lossy video coding |
CN113573070A (zh) * | 2021-06-03 | 2021-10-29 | 浙江大华技术股份有限公司 | 一种图像编码方法及装置、计算机存储介质 |
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JP2004343451A (ja) * | 2003-05-15 | 2004-12-02 | Matsushita Electric Ind Co Ltd | 動画像復号化方法および動画像復号化装置 |
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JP2004343451A (ja) * | 2003-05-15 | 2004-12-02 | Matsushita Electric Ind Co Ltd | 動画像復号化方法および動画像復号化装置 |
JP2005070938A (ja) * | 2003-08-21 | 2005-03-17 | Matsushita Electric Ind Co Ltd | 信号処理装置及びそれを用いた電子機器 |
JP2008205534A (ja) * | 2007-02-16 | 2008-09-04 | Matsushita Electric Ind Co Ltd | 符号化方式変換装置 |
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JP5435452B2 (ja) | 2014-03-05 |
US20110268366A1 (en) | 2011-11-03 |
US8818123B2 (en) | 2014-08-26 |
WO2010084628A1 (ja) | 2010-07-29 |
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