FR2499794B1 - Procede et equipement de traitement de signal de fac-simile a echelle de gris - Google Patents
Procede et equipement de traitement de signal de fac-simile a echelle de grisInfo
- Publication number
- FR2499794B1 FR2499794B1 FR8201450A FR8201450A FR2499794B1 FR 2499794 B1 FR2499794 B1 FR 2499794B1 FR 8201450 A FR8201450 A FR 8201450A FR 8201450 A FR8201450 A FR 8201450A FR 2499794 B1 FR2499794 B1 FR 2499794B1
- Authority
- FR
- France
- Prior art keywords
- equipment
- signal processing
- processing method
- gray scale
- facsimile signal
- 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
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
- H04N1/41—Bandwidth or redundancy reduction
- H04N1/4105—Bandwidth or redundancy reduction for halftone screened pictures
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Image Processing (AREA)
- Compression Of Band Width Or Redundancy In Fax (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56012233A JPS57127363A (en) | 1981-01-31 | 1981-01-31 | Coding system of halftone facsimile signal |
JP56012234A JPS57127364A (en) | 1981-01-31 | 1981-01-31 | Processing system of halftone facsimile signal |
JP56059505A JPS57174984A (en) | 1981-04-20 | 1981-04-20 | Encoding and decoding system for halftone fascimile signal |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2499794A1 FR2499794A1 (fr) | 1982-08-13 |
FR2499794B1 true FR2499794B1 (fr) | 1985-11-22 |
Family
ID=27279757
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8201450A Expired FR2499794B1 (fr) | 1981-01-31 | 1982-01-29 | Procede et equipement de traitement de signal de fac-simile a echelle de gris |
Country Status (4)
Country | Link |
---|---|
US (1) | US4409623A (fr) |
DE (1) | DE3202913C2 (fr) |
FR (1) | FR2499794B1 (fr) |
GB (1) | GB2092416B (fr) |
Families Citing this family (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5947666A (ja) * | 1982-09-13 | 1984-03-17 | Dainippon Screen Mfg Co Ltd | 2値画像のデ−タ圧縮方法 |
US4467363A (en) * | 1982-09-27 | 1984-08-21 | International Business Machines Corporation | Graphic data compression |
JPS59178077A (ja) * | 1983-03-28 | 1984-10-09 | Dainippon Screen Mfg Co Ltd | 2値画像のデ−タ圧縮方法 |
GB2139849B (en) * | 1983-05-07 | 1986-11-19 | Nippon Telegraph & Telephone | Image data compression system |
US4563671A (en) * | 1983-05-18 | 1986-01-07 | At&T Bell Laboratories | Coding technique |
JPS59223073A (ja) * | 1983-06-01 | 1984-12-14 | Canon Inc | 画像処理装置 |
JPS59225675A (ja) * | 1983-06-07 | 1984-12-18 | Canon Inc | フアクシミリ電送方法およびその装置 |
JPS59229709A (ja) * | 1983-06-10 | 1984-12-24 | Toshiba Corp | 画像情報記録装置 |
JPS60153264A (ja) * | 1984-01-20 | 1985-08-12 | Ricoh Co Ltd | 中間調画像伝送方式 |
US4593325A (en) * | 1984-08-20 | 1986-06-03 | The Mead Corporation | Adaptive threshold document duplication |
US4727421A (en) * | 1984-10-04 | 1988-02-23 | Nec Corporation | Method of coding picture signal and picture coding/decoding apparatus utilizing the same |
US4673987A (en) * | 1985-04-22 | 1987-06-16 | Ibm Corporation | Compressed block code for facsimile transmission |
JPS62100077A (ja) * | 1985-10-28 | 1987-05-09 | Nippon Telegr & Teleph Corp <Ntt> | 符号化方法および装置 |
US4742399A (en) * | 1985-11-01 | 1988-05-03 | Dainippon Screen Mfg. Co., Ltd. | Method of and apparatus for generating high-resolution bilevel image data |
US4947447A (en) * | 1986-04-24 | 1990-08-07 | Hitachi, Ltd. | Method for data coding |
JPS63236472A (ja) * | 1987-03-25 | 1988-10-03 | Fujitsu Ltd | 画像情報符号化処理装置 |
US4918543A (en) * | 1989-01-24 | 1990-04-17 | Eastman Kodak Company | Apparatus for thresholding an image signal |
US4912569A (en) * | 1989-01-24 | 1990-03-27 | Eastman Kodak Company | Method for thresholding an image signal |
US5781196A (en) * | 1990-10-19 | 1998-07-14 | Eidos Plc Of The Boat House | Video compression by extracting pixel changes exceeding thresholds |
US5323247A (en) * | 1990-12-04 | 1994-06-21 | Research Corporation Technologies | Method and apparatus for halftoning and inverse halftoning and the transmission of such images |
US5341228A (en) * | 1990-12-04 | 1994-08-23 | Research Corporation Technologies | Method and apparatus for halftone rendering of a gray scale image using a blue noise mask |
US5566255A (en) * | 1991-03-05 | 1996-10-15 | Ricoh Company, Ltd. | Segmenting a page of a document into areas which are text and areas which are halftone |
US5442458A (en) * | 1991-12-18 | 1995-08-15 | Eastman Kodak Company | Method and associated apparatus for encoding bitplanes for improved coding efficiency |
US5345317A (en) * | 1991-12-19 | 1994-09-06 | Kokusai Denshin Denwa Kabushiki Kaisha | High efficiency coding method for still natural images mingled with bi-level images |
US5576835A (en) * | 1992-02-24 | 1996-11-19 | Dirr; Josef | Method for run-length coding for shortening transmission time |
US5862262A (en) * | 1992-03-30 | 1999-01-19 | The United States Of America As Represented By The Secretary Of The Navy | Method of encoding a digital image using adaptive partitioning in an iterated transformation system |
EP0567697A1 (fr) * | 1992-04-29 | 1993-11-03 | Yiu Keung Chan | Méthode pour compression d'image en domaine spatial |
US5453843A (en) * | 1993-05-25 | 1995-09-26 | National Semiconductor Corporation | Method for fast data compression of half tone images with the use of pre-assigned codes |
JP3651941B2 (ja) * | 1994-11-28 | 2005-05-25 | キヤノン株式会社 | 画像再生装置 |
US5654762A (en) * | 1995-05-01 | 1997-08-05 | Tektronix, Inc. | Block matching for picture motion estimation using gray codes |
US6320986B1 (en) | 1995-08-18 | 2001-11-20 | International Business Machines Corporation | Preprocessing multiple bit per pixel sampled data for Lempel-Ziv compression |
DE19540424C2 (de) * | 1995-10-30 | 2003-07-03 | Dinu Scheppelmann | Verfahren zum Übertragen eines digitalen Bildes |
JPH09275498A (ja) * | 1996-04-05 | 1997-10-21 | Matsushita Electric Ind Co Ltd | 画像圧縮方法 |
JP2004120122A (ja) * | 2002-09-24 | 2004-04-15 | Sharp Corp | 画像処理装置 |
US20080263968A1 (en) * | 2007-04-25 | 2008-10-30 | Day Mark O | Prefabricated rapid response accommodation structure |
WO2009060517A1 (fr) * | 2007-11-06 | 2009-05-14 | Fujitsu Limited | Dispositif de traitement d'image, procédé de traitement d'image, et programme de traitement d'image |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2009568B (en) * | 1977-11-28 | 1982-03-24 | Nippon Telegraph & Telephone | Picture signal coding apparatus |
US4205341A (en) * | 1978-01-24 | 1980-05-27 | Nippon Telegraph And Telephone Public Corporation | Picture signal coding apparatus |
US4319267A (en) * | 1979-02-16 | 1982-03-09 | Nippon Telegraph And Telephone Public Corporation | Picture coding and/or decoding equipment |
-
1982
- 1982-01-25 US US06/342,548 patent/US4409623A/en not_active Expired - Fee Related
- 1982-01-29 DE DE3202913A patent/DE3202913C2/de not_active Expired
- 1982-01-29 FR FR8201450A patent/FR2499794B1/fr not_active Expired
- 1982-01-29 GB GB8202677A patent/GB2092416B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB2092416B (en) | 1985-02-27 |
GB2092416A (en) | 1982-08-11 |
DE3202913C2 (de) | 1984-02-16 |
US4409623A (en) | 1983-10-11 |
FR2499794A1 (fr) | 1982-08-13 |
DE3202913A1 (de) | 1982-08-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property | ||
ST | Notification of lapse |