BE898990A - DEVICE FOR CONVERTING AN ANALOGUE VIDEO SIGNAL INTO A TWO-LEVEL SIGNAL - Google Patents
DEVICE FOR CONVERTING AN ANALOGUE VIDEO SIGNAL INTO A TWO-LEVEL SIGNALInfo
- Publication number
- BE898990A BE898990A BE0/212445A BE212445A BE898990A BE 898990 A BE898990 A BE 898990A BE 0/212445 A BE0/212445 A BE 0/212445A BE 212445 A BE212445 A BE 212445A BE 898990 A BE898990 A BE 898990A
- Authority
- BE
- Belgium
- Prior art keywords
- signal
- converting
- video signal
- document
- analogue video
- 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
- H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
- Picture Signal Circuits (AREA)
- Collating Specific Patterns (AREA)
Abstract
Pour cette conversion, le signal vidéo obtenu par exploration d'un document est fourni, avec un signal de référence, à un circuit de comparaison. Pour éviter que le signal de sortie de ce circuit soit influencé par des irrégularités éventuelles du document, et pour limiter la perte d'information lorsque le document comporte des zones grises ou colorées, le signal de référence est formé par la somme des versions pondérées d'au moins deux signaux de référence auxiliaires. Application : dispositifs d'exploration d'empreintes digitales.For this conversion, the video signal obtained by scanning a document is supplied, with a reference signal, to a comparison circuit. To prevent the output signal from this circuit from being influenced by possible irregularities in the document, and to limit the loss of information when the document contains gray or colored areas, the reference signal is formed by the sum of the weighted versions of '' at least two auxiliary reference signals. Application: fingerprint scanning devices.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8300686A NL8300686A (en) | 1983-02-24 | 1983-02-24 | DEVICE FOR CONVERTING AN ANALOGUE VIDEO SIGNAL TO A TWO-VALUE SIGNAL. |
Publications (1)
Publication Number | Publication Date |
---|---|
BE898990A true BE898990A (en) | 1984-08-22 |
Family
ID=19841468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE0/212445A BE898990A (en) | 1983-02-24 | 1984-02-22 | DEVICE FOR CONVERTING AN ANALOGUE VIDEO SIGNAL INTO A TWO-LEVEL SIGNAL |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS59161973A (en) |
BE (1) | BE898990A (en) |
DE (1) | DE3403792A1 (en) |
FR (1) | FR2541838B1 (en) |
GB (1) | GB2135852B (en) |
NL (1) | NL8300686A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0681258B2 (en) * | 1988-12-05 | 1994-10-12 | 三菱電機株式会社 | Image data binarization circuit |
JP2809447B2 (en) * | 1989-01-21 | 1998-10-08 | 株式会社リコー | Image processing device |
EP0548571A1 (en) * | 1991-11-25 | 1993-06-30 | Eastman Kodak Company | System and method for bidirectional adaptive thresholding |
FR2812985B1 (en) | 2000-08-11 | 2003-08-22 | Atmel Grenoble Sa | DEMODULATION CIRCUIT OF A LOGIC SIGNAL TRANSMITTED BY ANALOGUE CHANNELS |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE323559C (en) * | 1919-03-18 | 1920-07-29 | Oscar Mey | Device for the arbitrary selection of the workers to be checked in industrial and commercial enterprises |
US3500073A (en) * | 1966-09-15 | 1970-03-10 | Phonocopy Inc | Analog to binary signal processor |
US3566281A (en) * | 1968-05-21 | 1971-02-23 | Ibm | Electric pulse wave clipping circuitry |
CA974607A (en) * | 1971-12-13 | 1975-09-16 | Bendix Corporation (The) | System for converting modulated signals to squarewave outputs |
US3869698A (en) * | 1973-11-29 | 1975-03-04 | Mohawk Data Sciences Corp | Optical character recognition video amplifier and digitizer |
FR2437125A1 (en) * | 1978-09-21 | 1980-04-18 | Cit Alcatel | DEVICE FOR PROCESSING AN IMAGE ANALYSIS SIGNAL |
-
1983
- 1983-02-24 NL NL8300686A patent/NL8300686A/en not_active Application Discontinuation
-
1984
- 1984-02-03 DE DE19843403792 patent/DE3403792A1/en not_active Ceased
- 1984-02-17 FR FR8402421A patent/FR2541838B1/en not_active Expired
- 1984-02-20 GB GB08404411A patent/GB2135852B/en not_active Expired
- 1984-02-22 JP JP59030446A patent/JPS59161973A/en active Granted
- 1984-02-22 BE BE0/212445A patent/BE898990A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
FR2541838A1 (en) | 1984-08-31 |
GB2135852B (en) | 1987-05-07 |
GB2135852A (en) | 1984-09-05 |
JPS59161973A (en) | 1984-09-12 |
FR2541838B1 (en) | 1987-10-09 |
DE3403792A1 (en) | 1984-08-30 |
JPH0439828B2 (en) | 1992-06-30 |
GB8404411D0 (en) | 1984-03-28 |
NL8300686A (en) | 1984-09-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0362595A3 (en) | Image binarization apparatus | |
GR3000384T3 (en) | Signalling detection | |
EP0840297A3 (en) | Track detection circuit for optical disc playback apparatus | |
FR2604792B1 (en) | DEVICE FOR PROCESSING THE OUTPUT SIGNALS OF A RESISTANCE BRIDGE | |
FR2399167A1 (en) | FAC-SIMILE CIRCUIT | |
FR2433862A1 (en) | CIRCUIT ARRANGEMENT FOR DETECTING ERRORS IN DIGITAL SIGNALS | |
KR880012032A (en) | FM communicator | |
BE898990A (en) | DEVICE FOR CONVERTING AN ANALOGUE VIDEO SIGNAL INTO A TWO-LEVEL SIGNAL | |
FR2438301A1 (en) | SIGNAL DETECTION CIRCUIT OF A MAGNETIC SENSOR | |
CA2100341A1 (en) | High speed data detection and clock recovery in a received multi-level data signal | |
EP0883249A3 (en) | Encoder | |
ATE205354T1 (en) | METHOD AND ARRANGEMENT FOR CONVERTING AN ACOUSTIC SIGNAL INTO AN ELECTRICAL SIGNAL | |
ATE55843T1 (en) | DIGITAL SIGNAL GENERATION SYSTEM AND METHOD THEREOF. | |
EP0400730A3 (en) | Zero crossing detector arrangements | |
ES8308073A1 (en) | Method and apparatus for comparing data signals in a container inspection device | |
EP0330100A3 (en) | Optical measuring device | |
CA2161042A1 (en) | Digital phase reversal detector | |
FR2685482B1 (en) | METHOD FOR DIGITIZING HEMATIES OR THROMBOCYTES AND DEVICE FOR IMPLEMENTING SAME. | |
EP0320641A3 (en) | Device for automatically selecting the demodulation standard of a video signal, useful with an intermediate frequency demodulator | |
EP0158409A3 (en) | Improved threshold detector | |
AU566217B2 (en) | Analog signal verification circuit | |
JPS5778266A (en) | Video information input deivce | |
JPS5765979A (en) | Signal processing device | |
NO875147D0 (en) | PROCEDURE FOR CONVERSION OF SIGNAL LEVELS, AND DEVICE FOR IMPLEMENTING THE PROCEDURE. | |
JPS57187773A (en) | Optical character reader |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
RE | Patent lapsed |
Owner name: N.V. PHILIPS' GLOEILAMPENFABRIEKEN Effective date: 19920228 |