JP2005510898A - 画像に埋め込まれたハーフトーン変調の検出 - Google Patents
画像に埋め込まれたハーフトーン変調の検出 Download PDFInfo
- Publication number
- JP2005510898A JP2005510898A JP2002586624A JP2002586624A JP2005510898A JP 2005510898 A JP2005510898 A JP 2005510898A JP 2002586624 A JP2002586624 A JP 2002586624A JP 2002586624 A JP2002586624 A JP 2002586624A JP 2005510898 A JP2005510898 A JP 2005510898A
- Authority
- JP
- Japan
- Prior art keywords
- image
- halftone
- filter
- embedded
- modulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/0021—Image watermarking
-
- 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
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
- H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
- H04N1/32203—Spatial or amplitude domain methods
-
- 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
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32101—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title
- H04N1/32144—Display, printing, storage or transmission of additional information, e.g. ID code, date and time or title embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
- H04N1/32149—Methods relating to embedding, encoding, decoding, detection or retrieval operations
- H04N1/32203—Spatial or amplitude domain methods
- H04N1/32256—Spatial or amplitude domain methods in halftone data
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Image Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
- Editing Of Facsimile Originals (AREA)
Abstract
Description
16:原画像
18:画像
36:デコーダ
52:ディザ・マトリックス
82:整合フィルタ
88:スコア・マップ
Claims (20)
- 画像(18)に埋め込まれた情報(14)を検出する方法であって、
複数の異なるハーフトーン変調の各々に関して、前記画像(18)にそれぞれのフィルタを適用して、前記画像(18)に埋め込まれたハーフトーン変調の順序付きシーケンスを識別するステップを含む方法。 - 各ハーフトーン変調が、それぞれのディザ・マトリックス(52)から生成される、請求項1に記載の方法。
- 各フィルタが、それぞれのハーフトーン変調用の整合フィルタ(82)に対応する、請求項1に記載の方法。
- 前記画像(18)にそれぞれのフィルタを適用するステップが、前記画像(18)と前記フィルタを畳み込むステップを含む、請求項1に記載の方法。
- 前記対応するフィルタと前記画像(18)との畳み込みに基づいて、各ハーフトーン変調のスコア・マップ(88)を生成するステップをさらに含む、請求項4に記載の方法。
- 前記生成されたスコア・マップ(88)に基づいて、前記画像(18)の領域に埋め込まれたハーフトーン変調を識別するステップをさらに含む、請求項5に記載の方法。
- 前記生成されたスコア・マップ(88)に基づいて複数のハーフトーン変調が識別される画像領域に対応するように1つのハーフトーン変調を選択するステップをさらに含む、請求項6に記載の方法。
- ハーフトーン変調が、前記スコア・マップ(88)に適用されるしきい値に基づいて前記画像(18)内で識別される、請求項6に記載の方法。
- 前記第1のしきい値に基づいてハーフトーン変調が識別されない領域内の前記しきい値を下げるステップをさらに含む、請求項8に記載の方法。
- ハーフトーニング前に画像階調を再マッピングするステップをさらに含む、請求項1に記載の方法。
- 前記画像(18)が、複数の画像レベルを含み、フィルタが、1度に1つの画像レベルに適用される、請求項1に記載の方法。
- 前記画像(18)が、複数のグレーレベルを含むグレースケール画像であり、フィルタが、最初に、前記画像(18)の中間グレーレベルに適用される、請求項11に記載の方法。
- フィルタが、最初に、前記画像(18)のグレーレベル50%に適用される、請求項12に記載の方法。
- フィルタが、不確実さまたはあいまいさをあるいはその両方を解決するために前記画像(18)の異なるグレーレベルに適用される、請求項12に記載の方法。
- 前記ハーフトーン変調の順序付きシーケンスが、ハーフトーン変調前に前記画像(18)に対応する原画像(16)に関する知識なしに識別可能である、請求項1に記載の方法。
- 画像(18)に埋め込まれた情報(14)を検出するシステムであって、
前記画像(18)にそれぞれのフィルタを適用して、ハーフトーン変調の各々に関して前記画像(18)に埋め込まれた複数の異なる前記ハーフトーン変調の順序付きシーケンスを識別するように構成されたデコーダ(36)を備えているシステム。 - 各ハーフトーン変調が、それぞれのディザ・マトリックス(52)に対応し、各フィルタが、それぞれのディザ・マトリックス(52)用の整合フィルタ(82)に対応する、請求項16に記載のシステム。
- 前記画像(18)が、複数の画像レベルを有し、前記デコーダが、フィルタを一度に1つの画像レベルに適用するように構成されている、請求項16に記載のシステム。
- 前記デコーダ(36)が、不確実さまたはあいまいさあるいはその両方を解決するために、異なるグレーレベルの前記画像(18)にフィルタを適用するように構成されている、請求項18に記載のシステム。
- 画像(18)に埋め込まれた情報(14)を検出するコンピュータ・プログラムであって、コンピュータ可読媒体上にあり、コンピュータに、
複数の異なるハーフトーン変調の各々に関し、前記画像(18)にそれぞれのフィルタを適用して、前記画像(18)に埋め込まれたハーフトーン変調の順序付きシーケンスを識別させるコンピュータ可読命令を含むコンピュータ・プログラム。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/844,324 US6839450B2 (en) | 2001-04-26 | 2001-04-26 | Detecting halftone modulations embedded in an image |
PCT/US2002/013254 WO2002089464A1 (en) | 2001-04-26 | 2002-04-26 | Detecting halftone modulations embedded in an image |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2005510898A true JP2005510898A (ja) | 2005-04-21 |
JP2005510898A5 JP2005510898A5 (ja) | 2005-12-22 |
JP4173994B2 JP4173994B2 (ja) | 2008-10-29 |
Family
ID=25292389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2002586624A Expired - Fee Related JP4173994B2 (ja) | 2001-04-26 | 2002-04-26 | 画像に埋め込まれたハーフトーン変調の検出 |
Country Status (4)
Country | Link |
---|---|
US (1) | US6839450B2 (ja) |
EP (1) | EP1382193A1 (ja) |
JP (1) | JP4173994B2 (ja) |
WO (1) | WO2002089464A1 (ja) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
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US6694041B1 (en) * | 2000-10-11 | 2004-02-17 | Digimarc Corporation | Halftone watermarking and related applications |
US8094869B2 (en) | 2001-07-02 | 2012-01-10 | Digimarc Corporation | Fragile and emerging digital watermarks |
US7039215B2 (en) * | 2001-07-18 | 2006-05-02 | Oki Electric Industry Co., Ltd. | Watermark information embedment device and watermark information detection device |
JP4150206B2 (ja) * | 2001-10-29 | 2008-09-17 | 富士フイルム株式会社 | 網点閾値データ作成方法 |
US7085399B2 (en) * | 2002-06-18 | 2006-08-01 | Oki Electric Industry Co., Ltd. | Watermark information embedding device and watermark information detection device |
KR100888589B1 (ko) * | 2002-06-18 | 2009-03-16 | 삼성전자주식회사 | 반복적으로 삽입된 워터마크 추출방법 및 그 장치 |
AU2003293087A1 (en) * | 2002-11-28 | 2004-06-23 | Digimarc Corporation | Systems and methods for authentication of print media |
CN100399790C (zh) * | 2003-04-25 | 2008-07-02 | 冲电气工业株式会社 | 水印信息检测方法 |
US7197161B2 (en) * | 2003-06-20 | 2007-03-27 | Xerox Corporation | Embedding information in images using two-layer conjugate screening |
US7245740B2 (en) * | 2003-07-01 | 2007-07-17 | Oki Electric Industry Co., Ltd. | Electronic watermark embedding device, electronic watermark detection device, electronic watermark embedding method, and electronic watermark detection method |
JP2005150815A (ja) * | 2003-11-11 | 2005-06-09 | Oki Electric Ind Co Ltd | 透かし情報埋め込み装置,透かし情報検出装置,透かし情報埋め込み方法,透かし情報検出方法,および印刷物 |
JP4155956B2 (ja) * | 2004-09-16 | 2008-09-24 | 三洋電機株式会社 | 電子透かし埋め込み装置と方法ならびに電子透かし抽出装置と方法 |
EP1690697A1 (en) | 2005-02-15 | 2006-08-16 | Alpvision SA | Method to apply an invisible mark on a media |
EP1691539A1 (en) * | 2005-02-15 | 2006-08-16 | European Central Bank | Two-dimensional security pattern that can be authenticated with one-dimensional signal processing |
US20100165087A1 (en) * | 2008-12-31 | 2010-07-01 | Corso Jason J | System and method for mosaicing endoscope images captured from within a cavity |
US9749607B2 (en) | 2009-07-16 | 2017-08-29 | Digimarc Corporation | Coordinated illumination and image signal capture for enhanced signal detection |
EP2296362B1 (en) | 2009-09-09 | 2012-02-15 | European Central Bank | A method for generating a security bi-level image for a banknote |
US10872392B2 (en) | 2017-11-07 | 2020-12-22 | Digimarc Corporation | Generating artistic designs encoded with robust, machine-readable data |
US10896307B2 (en) | 2017-11-07 | 2021-01-19 | Digimarc Corporation | Generating and reading optical codes with variable density to adapt for visual quality and reliability |
US11062108B2 (en) | 2017-11-07 | 2021-07-13 | Digimarc Corporation | Generating and reading optical codes with variable density to adapt for visual quality and reliability |
Family Cites Families (13)
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US5818970A (en) * | 1991-04-26 | 1998-10-06 | Canon Kabushiki Kaisha | Image encoding apparatus |
US5339170A (en) * | 1991-12-31 | 1994-08-16 | Xerox Corporation | Image processing system and method employing hybrid filtering to provide improved reconstruction of continuous tone images from halftone screen-structured images |
US5535020A (en) * | 1992-10-15 | 1996-07-09 | Digital Equipment Corporation | Void and cluster apparatus and method for generating dither templates |
US5812744A (en) * | 1996-04-30 | 1998-09-22 | Hewlett Packard Company | Joint design of dither matrices for a set of colorants |
US5799112A (en) * | 1996-08-30 | 1998-08-25 | Xerox Corporation | Method and apparatus for wavelet-based universal halftone image unscreening |
US5818032A (en) | 1997-01-03 | 1998-10-06 | Sun; Tsu-Hung Tom | Encoded color halftone micro-dots for high density digital information storage |
US5790703A (en) | 1997-01-21 | 1998-08-04 | Xerox Corporation | Digital watermarking using conjugate halftone screens |
US6088123A (en) * | 1997-11-21 | 2000-07-11 | International Business Machines Corporation | Dithering masks with very large periods |
TW355781B (en) * | 1998-01-09 | 1999-04-11 | Winbond Electronics Corp | Apparatus and method for 2-stage compression using half-tone method |
US6263086B1 (en) | 1998-04-15 | 2001-07-17 | Xerox Corporation | Automatic detection and retrieval of embedded invisible digital watermarks from halftone images |
US6141441A (en) * | 1998-09-28 | 2000-10-31 | Xerox Corporation | Decoding data from patterned color modulated image regions in a color image |
JP3705722B2 (ja) | 1999-10-20 | 2005-10-12 | 株式会社村田製作所 | 表面波装置 |
EP1094660A3 (en) * | 1999-10-20 | 2002-05-02 | Eastman Kodak Company | Embedding information in a halftoned digital image |
-
2001
- 2001-04-26 US US09/844,324 patent/US6839450B2/en not_active Expired - Lifetime
-
2002
- 2002-04-26 JP JP2002586624A patent/JP4173994B2/ja not_active Expired - Fee Related
- 2002-04-26 EP EP02766826A patent/EP1382193A1/en not_active Withdrawn
- 2002-04-26 WO PCT/US2002/013254 patent/WO2002089464A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
US20020180995A1 (en) | 2002-12-05 |
WO2002089464A1 (en) | 2002-11-07 |
EP1382193A1 (en) | 2004-01-21 |
JP4173994B2 (ja) | 2008-10-29 |
US6839450B2 (en) | 2005-01-04 |
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