CA2060291A1 - Image processing apparatus - Google Patents
Image processing apparatusInfo
- Publication number
- CA2060291A1 CA2060291A1 CA2060291A CA2060291A CA2060291A1 CA 2060291 A1 CA2060291 A1 CA 2060291A1 CA 2060291 A CA2060291 A CA 2060291A CA 2060291 A CA2060291 A CA 2060291A CA 2060291 A1 CA2060291 A1 CA 2060291A1
- Authority
- CA
- Canada
- Prior art keywords
- screened
- image
- level
- halftone
- processing apparatus
- 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.)
- Granted
Links
- 230000006866 deterioration Effects 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
Classifications
-
- 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
- H04N1/40062—Discrimination between different image types, e.g. two-tone, continuous tone
-
- 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
- H04N1/40075—Descreening, i.e. converting a halftone signal into a corresponding continuous-tone signal; Rescreening, i.e. combined descreening and halftoning
-
- 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
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N1/4051—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size
- H04N1/4052—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size by error diffusion, i.e. transferring the binarising error to neighbouring dot decisions
- H04N1/4053—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size by error diffusion, i.e. transferring the binarising error to neighbouring dot decisions with threshold modulated relative to input image data or vice versa
Abstract
An image processing apparatus for outputting an image which contains different kinds of multi-level signals for letters, figures, photographs, screened-halftone, etc. The apparatus comprises a screened-halftone pattern detecting circuit and a continuous-tone pattern detecting circuit for detecting a screened-halftone pattern and a continuous-tone pattern, respectively, by using neighboring pixels of the target pixel, counters for counting UP/DOWN in accordance with the outputs of the detecting circuits, a filter for switching the filtering coefficients of the image signal in multiple stages in accordance with the outputs of the counters and a quantizer for bi-level-quantizing the output of the filter. It is thus possible to produce an image having a good quality free from deterioration due to the rapid switching of region judgements and bi-level-quantizing methods.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPHEI3-29636 | 1991-01-30 | ||
JP3029636A JP2871127B2 (en) | 1991-01-30 | 1991-01-30 | Image processing apparatus and method |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2060291A1 true CA2060291A1 (en) | 1992-07-31 |
CA2060291C CA2060291C (en) | 1996-07-09 |
Family
ID=12281572
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002060291A Expired - Fee Related CA2060291C (en) | 1991-01-30 | 1992-01-29 | Image processing apparatus |
Country Status (6)
Country | Link |
---|---|
US (2) | US5291309A (en) |
EP (1) | EP0497304B1 (en) |
JP (1) | JP2871127B2 (en) |
AU (1) | AU635676B2 (en) |
CA (1) | CA2060291C (en) |
DE (1) | DE69209540T2 (en) |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2756371B2 (en) * | 1991-01-23 | 1998-05-25 | キヤノン株式会社 | Image processing device |
JPH0638031A (en) * | 1992-07-13 | 1994-02-10 | Mita Ind Co Ltd | Image density reproducing method |
JPH0683951A (en) * | 1992-09-02 | 1994-03-25 | Ricoh Co Ltd | Image forming device and its smoothing and enlarging process method for binary image data |
US5489991A (en) * | 1992-10-09 | 1996-02-06 | International Business Machines Corporation | Method for generating digital halftone images |
US5508822A (en) * | 1992-10-15 | 1996-04-16 | Digital Equipment Corporation | Imaging system with multilevel dithering using single memory |
US5535020A (en) | 1992-10-15 | 1996-07-09 | Digital Equipment Corporation | Void and cluster apparatus and method for generating dither templates |
JP2800633B2 (en) * | 1993-04-30 | 1998-09-21 | 富士ゼロックス株式会社 | Image coding device |
JP2874592B2 (en) * | 1994-05-31 | 1999-03-24 | 日本電気株式会社 | Image processing device for distinguishing text / photo / dot area |
US5692109A (en) * | 1994-07-01 | 1997-11-25 | Seiko Epson Corporation | Method and apparatus for minimizing artifacts in images produced by error diffusion halftoning |
US5592592A (en) * | 1994-07-01 | 1997-01-07 | Seiko Epson Corporation | Method and apparatus for minimizing artifacts in images produced by error diffusion halftoning utilizing ink reduction processing |
JP3381755B2 (en) * | 1994-10-11 | 2003-03-04 | セイコーエプソン株式会社 | Method and apparatus for improved adaptive filtering and thresholding to reduce image graininess |
JP3207690B2 (en) * | 1994-10-27 | 2001-09-10 | シャープ株式会社 | Image processing device |
JP3210248B2 (en) * | 1996-04-25 | 2001-09-17 | キヤノン株式会社 | Image processing apparatus and method |
US5903361A (en) * | 1996-06-06 | 1999-05-11 | Xerox Corporation | Method and system for processing image information using background error diffusion |
US6091891A (en) * | 1997-05-09 | 2000-07-18 | Lexmark International, Inc. | Method and apparatus for calibrating delay lines to create gray levels in continuous tone printing |
JP3585703B2 (en) * | 1997-06-27 | 2004-11-04 | シャープ株式会社 | Image processing device |
US6185328B1 (en) * | 1998-01-21 | 2001-02-06 | Xerox Corporation | Method and system for classifying and processing of pixels of image data |
US6549658B1 (en) * | 1998-01-21 | 2003-04-15 | Xerox Corporation | Method and system for classifying and processing of pixels of image data |
JPH11215363A (en) | 1998-01-28 | 1999-08-06 | Toshiba Tec Corp | Image-forming device |
US6160913A (en) * | 1998-03-25 | 2000-12-12 | Eastman Kodak Company | Method and apparatus for digital halftone dots detection and removal in business documents |
US6185335B1 (en) | 1998-07-07 | 2001-02-06 | Electronics For Imaging, Inc. | Method and apparatus for image classification and halftone detection |
US6552824B2 (en) * | 1998-12-17 | 2003-04-22 | Eastman Kodak Company | Method of processing pixels with binary or multibit error diffusion |
JP3334042B2 (en) | 1999-03-24 | 2002-10-15 | ミノルタ株式会社 | IMAGE PROCESSING APPARATUS, IMAGE READING APPARATUS AND IMAGE FORMING APPARATUS EQUIPPED WITH THE SAME, IMAGE PROCESSING METHOD, AND COMPUTER-READABLE STORAGE MEDIUM CONTAINING IMAGE PROCESSING PROCEDURE |
JP2001128003A (en) * | 1999-10-29 | 2001-05-11 | Matsushita Electric Ind Co Ltd | Picture binarization method |
JP2001169110A (en) * | 1999-12-10 | 2001-06-22 | Fuji Photo Film Co Ltd | Image conversion device and image conversion program storage medium |
JP4013478B2 (en) * | 2000-12-25 | 2007-11-28 | コニカミノルタビジネステクノロジーズ株式会社 | Image processing device |
US7085020B2 (en) * | 2001-11-14 | 2006-08-01 | International Business Machines Corporation | Raster data compression apparatus and method |
US6914700B2 (en) | 2003-04-17 | 2005-07-05 | Lexmark International, Inc. | Method for reducing migrating residual error in error diffusion halftoning |
JP2005086785A (en) * | 2003-09-11 | 2005-03-31 | Brother Ind Ltd | Image processing apparatus, image processing method and image processing program |
US7869094B2 (en) * | 2005-01-07 | 2011-01-11 | Mitcham Global Investments Ltd. | Selective dithering |
JP4632452B2 (en) * | 2006-07-07 | 2011-02-16 | キヤノン株式会社 | Image correction processing apparatus, image correction processing method, program, and storage medium |
EP1995712A1 (en) * | 2007-05-21 | 2008-11-26 | Deutsche Thomson OHG | Method for applying dithering to video data and display device implementing said method |
JP4506847B2 (en) * | 2008-02-08 | 2010-07-21 | ソニー株式会社 | Tone modulation apparatus, image processing apparatus, image processing method, and program |
US20100027074A1 (en) * | 2008-07-31 | 2010-02-04 | Sharp Laboratories Of America, Inc. | Partition halftone for multi-tone level output device |
JP5434799B2 (en) * | 2010-06-01 | 2014-03-05 | コニカミノルタ株式会社 | Image coding apparatus, image coding method, and image coding program |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US389811A (en) * | 1888-09-18 | Embroidery-frame | ||
US4194221A (en) * | 1978-12-26 | 1980-03-18 | Xerox Corporation | Automatic multimode continuous halftone line copy reproduction |
US4554593A (en) * | 1981-01-02 | 1985-11-19 | International Business Machines Corporation | Universal thresholder/discriminator |
JPS583374A (en) * | 1981-06-29 | 1983-01-10 | Nippon Telegr & Teleph Corp <Ntt> | Intermediate tone processing system |
GB2103449B (en) * | 1981-06-29 | 1985-05-30 | Nippon Telegraph & Telephone | Method and apparatus for gray level signal processing |
EP0512578B1 (en) * | 1986-12-19 | 1996-11-20 | Matsushita Electric Industrial Co., Ltd. | Bi-level image display signal processing apparatus |
JPH07121063B2 (en) * | 1987-01-21 | 1995-12-20 | 富士ゼロックス株式会社 | Image processing device |
JP2507927B2 (en) * | 1987-01-21 | 1996-06-19 | 富士ゼロックス株式会社 | Image processing device |
JPS6419872A (en) * | 1987-07-15 | 1989-01-23 | Ricoh Kk | Picture processing system |
JPS6444681A (en) * | 1987-08-12 | 1989-02-17 | Fuji Photo Film Co Ltd | Dot screen forming method |
JPS6457877A (en) * | 1987-08-27 | 1989-03-06 | Fuji Xerox Co Ltd | Area identification method for picture processor |
US4899225A (en) * | 1987-12-31 | 1990-02-06 | Fuji Xerox Co., Ltd. | Image processing method |
JP2815157B2 (en) * | 1988-02-25 | 1998-10-27 | 株式会社リコー | Image processing device |
JP2859268B2 (en) * | 1988-03-07 | 1999-02-17 | キヤノン株式会社 | Image processing method |
JPH01295570A (en) * | 1988-05-23 | 1989-11-29 | Mitsubishi Electric Corp | Picture processing device |
JP2777380B2 (en) * | 1988-10-26 | 1998-07-16 | 株式会社リコー | Halftone area detection method |
JP2777378B2 (en) * | 1988-10-21 | 1998-07-16 | 株式会社リコー | Halftone area detection method |
JPH02253765A (en) * | 1989-03-28 | 1990-10-12 | Toshiba Corp | Picture processor |
JP3093235B2 (en) * | 1989-11-30 | 2000-10-03 | 株式会社リコー | Image processing method and apparatus |
-
1991
- 1991-01-30 JP JP3029636A patent/JP2871127B2/en not_active Expired - Fee Related
-
1992
- 1992-01-24 AU AU10491/92A patent/AU635676B2/en not_active Ceased
- 1992-01-27 US US07/825,973 patent/US5291309A/en not_active Expired - Lifetime
- 1992-01-29 DE DE69209540T patent/DE69209540T2/en not_active Expired - Fee Related
- 1992-01-29 EP EP92101452A patent/EP0497304B1/en not_active Expired - Lifetime
- 1992-01-29 CA CA002060291A patent/CA2060291C/en not_active Expired - Fee Related
-
1993
- 1993-12-03 US US08/162,580 patent/US5361142A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0497304A3 (en) | 1992-09-30 |
CA2060291C (en) | 1996-07-09 |
DE69209540T2 (en) | 1996-09-19 |
EP0497304A2 (en) | 1992-08-05 |
JP2871127B2 (en) | 1999-03-17 |
AU1049192A (en) | 1992-08-13 |
AU635676B2 (en) | 1993-03-25 |
DE69209540D1 (en) | 1996-05-09 |
US5361142A (en) | 1994-11-01 |
JPH04356869A (en) | 1992-12-10 |
EP0497304B1 (en) | 1996-04-03 |
US5291309A (en) | 1994-03-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |