JP2004094947A - 文書の電子画像の強調方法 - Google Patents
文書の電子画像の強調方法 Download PDFInfo
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- JP2004094947A JP2004094947A JP2003298319A JP2003298319A JP2004094947A JP 2004094947 A JP2004094947 A JP 2004094947A JP 2003298319 A JP2003298319 A JP 2003298319A JP 2003298319 A JP2003298319 A JP 2003298319A JP 2004094947 A JP2004094947 A JP 2004094947A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000012986 modification Methods 0.000 claims abstract 2
- 230000004048 modification Effects 0.000 claims abstract 2
- 239000003086 colorant Substances 0.000 claims description 9
- 230000002708 enhancing effect Effects 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 abstract description 12
- 238000003672 processing method Methods 0.000 abstract description 2
- 238000010606 normalization Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 238000009499 grossing Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 238000003384 imaging method Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 7
- 230000002902 bimodal effect Effects 0.000 description 6
- 230000010339 dilation Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 230000000877 morphologic effect Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011524 similarity measure Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/90—Dynamic range modification of images or parts thereof
- G06T5/94—Dynamic range modification of images or parts thereof based on local image properties, e.g. for local contrast enhancement
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/194—Segmentation; Edge detection involving foreground-background segmentation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
- H04N1/4072—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original
- H04N1/4074—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original using histograms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6027—Correction or control of colour gradation or colour contrast
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10004—Still image; Photographic image
- G06T2207/10008—Still image; Photographic image from scanner, fax or copier
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10024—Color image
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20036—Morphological image processing
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30176—Document
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Image Processing (AREA)
- Color Image Communication Systems (AREA)
- Facsimile Image Signal Circuits (AREA)
- Editing Of Facsimile Originals (AREA)
- Studio Devices (AREA)
Abstract
【解決手段】 前景のマーキングが上に配置された背景を有する、文書の電子画像の強調方法は、画素から成る電子画像を受け取る工程(710)と、初期前景/背景推定を構成するために画素に仮の前景/背景ステータスを割り当てる工程(720)と、修正前景/背景推定を構成するために初期前景/背景推定を修正する工程(730)と、修正前景/背景推定が画素に対する最終的な前景/背景割当てであるか否かを決定する工程(740)と、画素に対する最終的な前景/背景割当てが達成されるまで修正前景/背景推定の修正を反復する工程と、画素に対する最終的な前景/背景割当てを供給する工程(750)と、を含む。
【選択図】 図2
Description
610 プロセッサ
650 プログラムメモリ
652 前景/背景分離モジュール
654 色正規化モジュール
656 局所コントラスト推定モジュール
660 データメモリ
662 原画像データメモリ
664 仮の前景/背景マスク
666 最終的な前景/背景マスク
668 局所コントラスト推定
670 背景白色推定
672 最終的な色正規化画像
674 カラーテーブル
Claims (3)
- 前景のマーキングが上に配置された背景を有する、文書の電子画像の強調方法であって、
画素から成る電子画像を受け取る工程と、
初期前景/背景推定を構成するために前記画素に初期の仮の前景/背景ステータスを割り当てる工程と、
修正前景/背景推定を構成するために前記初期前景/背景推定を修正する工程と、
前記修正前景/背景推定が前記画素に対する最終的な前景/背景割当てであるか否かを決定する工程と、
前記画素に対する前記最終的な前景/背景割当てが達成されるまで前記修正前景/背景推定の修正を反復する工程と、
前記画素に対する前記最終的な前景/背景割当てを供給する工程と、
を含む、文書の電子画像の強調方法。 - 前記初期の仮の前景/背景ステータスを割り当てる工程が、
前記画素に対する複数のカラーテーブルビンから成るカラーテーブルを作成するために、画像の色を量子化する工程と、
最も白を表していそうな少なくとも1つの前記カラーテーブルビンを識別する工程と、
色相、彩度及び明度の比較に基づいて第1の複数の前記画素に仮の前景ステータスを割り当てる工程と、
を含む、請求項1に記載の文書の電子画像の強調方法。 - 前記初期前景/背景推定を修正する工程が、
ハイパスフィルタリングに基づいて第2の複数の前記画素に仮の前景ステータスを割り当てる工程と、
前記仮の前景ステータスが割り当てられなかった画素に仮の背景ステータスを割り当てる工程と、
白色背景画素アレイを推定する工程と、
を含む、請求項1に記載の文書の電子画像の強調方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US40743302P | 2002-08-29 | 2002-08-29 | |
US10/396,223 US7177483B2 (en) | 2002-08-29 | 2003-03-24 | System and method for enhancement of document images |
Publications (2)
Publication Number | Publication Date |
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JP2004094947A true JP2004094947A (ja) | 2004-03-25 |
JP4514421B2 JP4514421B2 (ja) | 2010-07-28 |
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Application Number | Title | Priority Date | Filing Date |
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JP2003298319A Expired - Fee Related JP4514421B2 (ja) | 2002-08-29 | 2003-08-22 | 文書の電子画像の強調方法 |
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US (1) | US7177483B2 (ja) |
JP (1) | JP4514421B2 (ja) |
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JP2009044628A (ja) * | 2007-08-10 | 2009-02-26 | Mitsubishi Electric Corp | 画像処理装置及び画像処理方法 |
JP2012505460A (ja) * | 2008-10-13 | 2012-03-01 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 画像のコントラスト強調 |
US8306336B2 (en) | 2006-05-17 | 2012-11-06 | Qualcomm Incorporated | Line or text-based image processing tools |
CN109862356A (zh) * | 2019-01-17 | 2019-06-07 | 中国科学院计算技术研究所 | 一种基于感兴趣区域的视频编码方法及系统 |
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JP2012505460A (ja) * | 2008-10-13 | 2012-03-01 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 画像のコントラスト強調 |
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JP4514421B2 (ja) | 2010-07-28 |
US7177483B2 (en) | 2007-02-13 |
US20040042680A1 (en) | 2004-03-04 |
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