JP4296126B2 - スクリーン作成装置 - Google Patents
スクリーン作成装置 Download PDFInfo
- Publication number
- JP4296126B2 JP4296126B2 JP2004179231A JP2004179231A JP4296126B2 JP 4296126 B2 JP4296126 B2 JP 4296126B2 JP 2004179231 A JP2004179231 A JP 2004179231A JP 2004179231 A JP2004179231 A JP 2004179231A JP 4296126 B2 JP4296126 B2 JP 4296126B2
- Authority
- JP
- Japan
- Prior art keywords
- screen
- image
- matrix
- halftone
- digital
- 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.)
- Expired - Fee Related
Links
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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2201/00—General purpose image data processing
- G06T2201/005—Image watermarking
- G06T2201/0051—Embedding of the watermark in the spatial domain
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Editing Of Facsimile Originals (AREA)
- Image Processing (AREA)
Description
bk(i,j)=t(k,r)+(M×N)×[bbk(m,n)−1]・・・(1)
ob(i,j)= t(k,r)+(M×N)×[bob(m,n)−1]・・・(2)
ここで、
m、n=0、L−1
k=0、1、M−1
r=0、1、N−1
i=L×k+m
j=L×k+n
20:画像処理ユニット(IPU)
30:画像出力ターミナル
40:ハーフトーンプロセッサ
Claims (1)
- 3×3で構成されかつ1〜9の値が配置された第1のマトリックススクリーンt(k,r)、2×2で構成されかつ1〜4の値が配置された第2のマトリックススクリーンbbk(m,n)、及び2×2で構成されかつ1〜4の値が該第2のマトリックスとは異なる位置に配置された第3のマトリックススクリーンbob(m,n)を記憶する記憶手段と、
前記第1のマトリックススクリーンt(k,r)、前記第3のマトリックススクリーンbob(m,n)、及び以下の式(2)により、ディジタル画像に電子透かしとしての識別マークが組み込まれる予め定められた第1の領域に対応してしきい値を第1のパターンで配置した第1のスクリーンob(i,j)を作成すると共に、前記第1のマトリックススクリーンt(k,r)、前記第2のマトリックススクリーンbbk(m,n)、及び以下の式(1)により、該デジタル画像に該識別マークが組み込まれない第2の領域に対応して該しきい値を該第1のパターンとは異なる第2のパターンで配置した第2のスクリーンbk(i,j)を作成する作成手段と、
を備えたスクリーン作成装置。
bk(i,j)=t(k,r)+(M×N)×[bbk(m,n)−1]・・・(1)
ob(i,j)= t(k,r)+(M×N)×[bob(m,n)−1]・・・(2)
ここで、
m、n=0、L−1
k=0、1、M−1
r=0、1、N−1
i=L×k+m
j=L×k+n
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/600,139 US7197161B2 (en) | 2003-06-20 | 2003-06-20 | Embedding information in images using two-layer conjugate screening |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005012807A JP2005012807A (ja) | 2005-01-13 |
JP4296126B2 true JP4296126B2 (ja) | 2009-07-15 |
Family
ID=33517676
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004179231A Expired - Fee Related JP4296126B2 (ja) | 2003-06-20 | 2004-06-17 | スクリーン作成装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7197161B2 (ja) |
JP (1) | JP4296126B2 (ja) |
BR (1) | BRPI0401962A (ja) |
CA (1) | CA2470980C (ja) |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7333628B2 (en) * | 2003-08-22 | 2008-02-19 | Seiko Epson Corporation | Data embedding with multi-level screening |
JP4167590B2 (ja) * | 2003-12-22 | 2008-10-15 | 株式会社東芝 | 画像処理方法 |
US7352879B2 (en) * | 2004-12-06 | 2008-04-01 | Xerox Corporation | Conjugate cluster screens for embedding digital watermarks into printed halftone documents |
US7436977B2 (en) * | 2005-01-26 | 2008-10-14 | Xerox Corporation | Embedding variable watermark information in halftone screens |
DE602006019104D1 (de) * | 2005-08-22 | 2011-02-03 | Nds Ltd | Spielfilm-kopierschutz |
US20070070425A1 (en) * | 2005-09-29 | 2007-03-29 | Lexmark International, Inc. | Object-based sharpening for an image forming device |
US7580155B2 (en) * | 2005-12-19 | 2009-08-25 | Xerox Corporation | Tools to embed information into digital visual works |
US20080019559A1 (en) * | 2006-07-21 | 2008-01-24 | Xerox Corporation | Digital watermarking process |
US8761532B2 (en) * | 2007-02-20 | 2014-06-24 | Xerox Corporation | Method and system for the selective application of automatic image enhancement to digital images |
US20080250505A1 (en) * | 2007-04-05 | 2008-10-09 | Jason David Koziol | Methods And Systems For Generating A Symbol Identification Challenge |
US20100217988A1 (en) * | 2007-04-12 | 2010-08-26 | Avow Systems, Inc. | Electronic document management and delivery |
US7974437B2 (en) * | 2007-11-19 | 2011-07-05 | Seiko Epson Corporation | Identifying steganographic data in an image |
US8081823B2 (en) * | 2007-11-20 | 2011-12-20 | Seiko Epson Corporation | Segmenting a string using similarity values |
US8031905B2 (en) * | 2007-11-21 | 2011-10-04 | Seiko Epson Corporation | Extracting data from images |
US8243981B2 (en) * | 2007-11-26 | 2012-08-14 | Seiko Epson Corporation | Identifying embedded data in an image |
US8009862B2 (en) * | 2007-11-27 | 2011-08-30 | Seiko Epson Corporation | Embedding data in images |
US7894103B2 (en) * | 2008-02-20 | 2011-02-22 | Xerox Corporation | Variable data digital pantographs |
US20100046790A1 (en) * | 2008-08-22 | 2010-02-25 | Koziol Anthony R | Method and system for generating a symbol identification challenge |
US7869090B2 (en) * | 2008-12-17 | 2011-01-11 | Xerox Corporation | Variable data digital pantographs |
US8240475B2 (en) | 2010-06-15 | 2012-08-14 | Xerox Corporation | Color flicker boxes |
US10068074B2 (en) | 2016-03-25 | 2018-09-04 | Credly, Inc. | Generation, management, and tracking of digital credentials |
US10033536B2 (en) | 2016-03-25 | 2018-07-24 | Credly, Inc. | Generation, management, and tracking of digital credentials |
US20190089692A1 (en) | 2017-09-15 | 2019-03-21 | Pearson Education, Inc. | Time-based degradation of digital credentials in a digital credential platform |
US10803104B2 (en) | 2017-11-01 | 2020-10-13 | Pearson Education, Inc. | Digital credential field mapping |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5790703A (en) * | 1997-01-21 | 1998-08-04 | Xerox Corporation | Digital watermarking using conjugate halftone screens |
US6252971B1 (en) * | 1998-04-29 | 2001-06-26 | Xerox Corporation | Digital watermarking using phase-shifted stoclustic screens |
US6752432B1 (en) * | 1999-06-23 | 2004-06-22 | Digimarc Corporation | Identification card with embedded halftone image security feature perceptible in transmitted light |
US7089420B1 (en) * | 2000-05-24 | 2006-08-08 | Tracer Detection Technology Corp. | Authentication method and system |
US7058199B1 (en) * | 2000-08-14 | 2006-06-06 | The Hong Kong University Of Science And Technology | Methods and apparatus for hiding data in halftone images |
US6731409B2 (en) * | 2001-01-31 | 2004-05-04 | Xerox Corporation | System and method for generating color digital watermarks using conjugate halftone screens |
US6839450B2 (en) * | 2001-04-26 | 2005-01-04 | Hewlett-Packard Development Company, L.P. | Detecting halftone modulations embedded in an image |
US6991260B2 (en) * | 2002-10-30 | 2006-01-31 | Xerox Corporation | Anti-counterfeiting see-through security feature using line patterns |
-
2003
- 2003-06-20 US US10/600,139 patent/US7197161B2/en not_active Expired - Fee Related
-
2004
- 2004-06-15 CA CA002470980A patent/CA2470980C/en not_active Expired - Fee Related
- 2004-06-16 BR BR0401962-8A patent/BRPI0401962A/pt not_active IP Right Cessation
- 2004-06-17 JP JP2004179231A patent/JP4296126B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2470980A1 (en) | 2004-12-20 |
US7197161B2 (en) | 2007-03-27 |
US20040258272A1 (en) | 2004-12-23 |
BRPI0401962A (pt) | 2005-01-25 |
JP2005012807A (ja) | 2005-01-13 |
CA2470980C (en) | 2008-07-29 |
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