WO1991010313A3 - Suppression de faux contours de densite utilisant des signaux d'entree modifies de maniere aleatoire, compares a des valeurs de seuil - Google Patents
Suppression de faux contours de densite utilisant des signaux d'entree modifies de maniere aleatoire, compares a des valeurs de seuil Download PDFInfo
- Publication number
- WO1991010313A3 WO1991010313A3 PCT/US1990/007391 US9007391W WO9110313A3 WO 1991010313 A3 WO1991010313 A3 WO 1991010313A3 US 9007391 W US9007391 W US 9007391W WO 9110313 A3 WO9110313 A3 WO 9110313A3
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- comparison
- input signals
- threshold values
- modified input
- randomly modified
- Prior art date
Links
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
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Image Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP91903074A EP0461250B1 (fr) | 1990-01-02 | 1990-12-20 | Suppression de faux contours de densite utilisant des signaux d'entree modifies de maniere aleatoire, compares a des valeurs de seuil |
JP91503260A JPH04505089A (ja) | 1990-01-02 | 1990-12-20 | しきい値との比較のために確率的に変更された入力信号を用いた偽濃度輪郭抑制 |
DE69020727T DE69020727T2 (de) | 1990-01-02 | 1990-12-20 | Fehlerhafte dichtekonturunterdrückung, die zufallsmodifizierte eingangssignale für den vergleich mit schwellenwerten benutzt. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US459,496 | 1990-01-02 | ||
US07/459,496 US4959730A (en) | 1990-01-02 | 1990-01-02 | False density contour suppression using randomly modified input signals for comparison to threshold values |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1991010313A2 WO1991010313A2 (fr) | 1991-07-11 |
WO1991010313A3 true WO1991010313A3 (fr) | 1991-08-22 |
Family
ID=23825024
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1990/007391 WO1991010313A2 (fr) | 1990-01-02 | 1990-12-20 | Suppression de faux contours de densite utilisant des signaux d'entree modifies de maniere aleatoire, compares a des valeurs de seuil |
Country Status (5)
Country | Link |
---|---|
US (1) | US4959730A (fr) |
EP (1) | EP0461250B1 (fr) |
JP (1) | JPH04505089A (fr) |
DE (1) | DE69020727T2 (fr) |
WO (1) | WO1991010313A2 (fr) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4945422A (en) * | 1990-01-02 | 1990-07-31 | Eastman Kodak Company | False density contour suppression using stored random probabilities to form print/no-print decisions |
US5404411A (en) * | 1990-12-27 | 1995-04-04 | Xerox Corporation | Bitmap-image pattern matching apparatus for correcting bitmap errors in a printing system |
US5274472A (en) * | 1992-05-21 | 1993-12-28 | Xerox Corporation | High addressability image generator using pseudo interpolation of video and screen data |
US5233366A (en) * | 1992-05-26 | 1993-08-03 | Xerox Corporation | Half-tone printing with thermal ink jet using random spot distribution in one dimension |
US5313309A (en) * | 1992-06-05 | 1994-05-17 | Eastman Kodak Company | Method and apparatus for printing halftones with a gray level printer with contour suppression and/or minimization of moire patterns |
US5463720A (en) * | 1992-09-28 | 1995-10-31 | Granger; Edward M. | Blue noise based technique for use in a halftone tile oriented screener for masking screener induced image artifacts |
US6040876A (en) * | 1995-10-13 | 2000-03-21 | Texas Instruments Incorporated | Low intensity contouring and color shift reduction using dither |
JP3708222B2 (ja) * | 1996-06-12 | 2005-10-19 | 富士写真フイルム株式会社 | 階調補正画像データ作成方法、階調補正網%データ作成方法、階調補正閾値データ作成方法および画像出力装置 |
DE102006035254A1 (de) * | 2006-07-26 | 2008-01-31 | Francotyp-Postalia Gmbh | Verfahren und Anordnung zum Erzeugen eines Abdrucks |
WO2009005497A1 (fr) * | 2007-06-29 | 2009-01-08 | Thomson Licensing | Appareil et procédé pour réduire des artéfacts dans des images |
CN103918274B (zh) | 2011-11-01 | 2015-08-26 | 杜比实验室特许公司 | 对具有扩展动态范围的图像的分层编码中的自适应伪轮廓预防 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4245258A (en) * | 1979-11-05 | 1981-01-13 | Xerox Corporation | Method and apparatus for reduction of false contours in electrically screened images |
GB2105144A (en) * | 1981-08-11 | 1983-03-16 | Dainippon Screen Mfg | A method and apparatus for making half-tone images |
EP0274196A1 (fr) * | 1986-11-26 | 1988-07-13 | Crosfield Electronics Limited | Génération de reproductions en demi-teintes |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4184206A (en) * | 1978-03-07 | 1980-01-15 | Hughes Aircraft Company | Subpixel X-Y coordinate encoding |
JPS58114570A (ja) * | 1981-12-26 | 1983-07-07 | Canon Inc | 画像処理装置 |
US4654721A (en) * | 1985-04-12 | 1987-03-31 | International Business Machines Corporation | System for reproducing multi-level digital images on a bi-level printer of fixed dot size |
-
1990
- 1990-01-02 US US07/459,496 patent/US4959730A/en not_active Expired - Lifetime
- 1990-12-20 WO PCT/US1990/007391 patent/WO1991010313A2/fr active IP Right Grant
- 1990-12-20 JP JP91503260A patent/JPH04505089A/ja active Pending
- 1990-12-20 EP EP91903074A patent/EP0461250B1/fr not_active Expired - Lifetime
- 1990-12-20 DE DE69020727T patent/DE69020727T2/de not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4245258A (en) * | 1979-11-05 | 1981-01-13 | Xerox Corporation | Method and apparatus for reduction of false contours in electrically screened images |
GB2105144A (en) * | 1981-08-11 | 1983-03-16 | Dainippon Screen Mfg | A method and apparatus for making half-tone images |
EP0274196A1 (fr) * | 1986-11-26 | 1988-07-13 | Crosfield Electronics Limited | Génération de reproductions en demi-teintes |
Also Published As
Publication number | Publication date |
---|---|
WO1991010313A2 (fr) | 1991-07-11 |
EP0461250B1 (fr) | 1995-07-05 |
DE69020727T2 (de) | 1996-03-07 |
JPH04505089A (ja) | 1992-09-03 |
EP0461250A1 (fr) | 1991-12-18 |
US4959730A (en) | 1990-09-25 |
DE69020727D1 (de) | 1995-08-10 |
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