GB1388026A - Appratus for the optical-electrical scanning of a drawing - Google Patents
Appratus for the optical-electrical scanning of a drawingInfo
- Publication number
- GB1388026A GB1388026A GB1374272A GB1374272A GB1388026A GB 1388026 A GB1388026 A GB 1388026A GB 1374272 A GB1374272 A GB 1374272A GB 1374272 A GB1374272 A GB 1374272A GB 1388026 A GB1388026 A GB 1388026A
- Authority
- GB
- United Kingdom
- Prior art keywords
- colour
- photo
- output
- points
- 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
- 238000005286 illumination Methods 0.000 abstract 3
- 238000000034 method Methods 0.000 abstract 2
- 230000000881 depressing effect Effects 0.000 abstract 1
- 230000003595 spectral effect Effects 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
- H04N1/46—Colour picture communication systems
- H04N1/54—Conversion of colour picture signals to a plurality of signals some of which represent particular mixed colours, e.g. for textile printing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/51—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors using colour filters
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Textile Engineering (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Spectrometry And Color Measurement (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
1388026 Measuring colour photo-electrically FRANZ MORAT GmbH 23 March 1972 [17 April 1971] 13742/72 Heading G1A In an apparatus for point-by-point scanning of a drawing consisting of a large number of differently coloured points, in which the scanning head includes a plurality of photo-cells 31 r, b, g, each responding to a definite spectral range, the output from each photo-cell is supplied to a plurality of colour discriminators 411, 412, 413, each of which produces a colour signal characterizing the point being viewed only when all the photo-cell outputs, or signals derived therefrom, be within respective upwardly and downwardly limited tolerance ranges defined by the discriminator. To calibrate the discriminator 411 for a first colour the scanning head including photo-diodes or photo-transistors 31 is brought above a point of that colour. The photo-cells 31 r, b, g have associated therewith filters or dichroic mirrors to render them responsive to red, blue and green light respectively. In this embodiment the points B 1 and B2, G1 and G2, R1 and R2 are connected together, so that the amplifed blue output signal is applied to the pair of differential amplifiers 43 b1, b2. Amplifiers 43 b1 provides an output only when its input is below a certain level, whereas 43 b2 provides an output only when its input is above a pre-set level. This tolerance range is adjustable by means of resistor 49b, which changes both upper and lower limits symmetrically. Initially the resistor 49b is set to provide the narrowest tolerance range, and resistor 37b of pre-amplifier 33b is adjusted so that the blue output lies in this range, at which point lamps 69b light up. This procedure is repeated for the green and red signals. Next the scanning head is placed successively over a number of points of the same colour but of different quality of covering, i.e. the white background may be showing through. Resistors 37 must now be kept fixed, and the tolerance ranges are widened, using the resistors 49, so that eventually all points of the same colour on the drawing will produce an output signal from the AND-gate 451 of the colour discriminator. This process is repeated for all the other colour discriminators 412, 413 ... After this calibration each colour of the drawing will produce a colour signal from only one discriminator. In the above mode of operation, the resistor chains 47-50 are supplied with a stabilized voltage source from a battery and a Zener diode 59, via a switch position 53 (4) and an operational amplifier 51. This may lead to errors if the illumination intensity changes. To overcome this, the output level at any one of the pre-amplifiers 33 may be used as a reference voltage level for the pre-amplifiers 33 by moving the contact of switch 53. The chosen output level may be monitored by depressing push-button 38 to produce a display on the appropriate dial 39. In a further embodiment, the threshold amplifiers 43 do not receive directly the amplified photo-cell outputs but "normalized" versions thereof, i.e. signals which relate the photo-cell outputs to the white background level. To do this there is interposed between points B1, G1, R1 and B2, G2, R2, circuitry (77) which stores white signal values derived from a calibration viewing of uncoloured points and compares these values (at 97) with the photo-cell outputs. Fig. 3 (not shown). The "normalized" photo-cell outputs may be supplied to a circuit arrangement in which each threshold limit is independently adjustable by having its corresponding variable resistor (115- 129) Fig. 4 (not shown). In this case one of the three "normalized" photo-cell outputs may be used as a reference signal to adjust for variations in illumination level. Another embodiment employs the circuitry of Fig. 5 positioned between the points B1, G1, R1 and B2, G2, R2. By forming the quotient values shown errors due to temperature, illumination or voltage fluctuations, which affect both top and bottom lines, are eliminated. The outputs from the circuit of Fig. 5 may be applied to a modified threshold circuit, Fig. 6 (not shown). In this embodiment, each of the two quotient outputs at B9, G9 is subtracted (145, 147) from a fixed base value. These two "differential quotient" signals are then applied to a further dividing circuit (149) which calculates the absolute value of their quotient. This final quotient signal is applied to two threshold amplifiers 151, 153. If the output from the divider (149) is within the variable threshold a signal is supplied to an AND gate (161). This gate also receives signals indicative of (a) the sign of the quotient and (b) whether or not the sum value (B + G + R) - see Fig. 5 - lies within a certain threshold value. The information (a) and (b) locates the colour within the colour triangle, and the AND gate (161) produces an output if the colour being scanned is the one for which the discriminator was originally calibrated. The apparatus may be used in a device according to Specifications 1170947 or 1190600, in which case the "white" stored reference signals Fig. 3 (not shown) are arranged to be up-dated each time a white margin is scanned. Alternatively, the drawing to be scanned may be clamped on the periphery of a rotating drum.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712118720 DE2118720A1 (en) | 1971-04-17 | 1971-04-17 | Device for optical-electrical scanning of a colored drawing |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1388026A true GB1388026A (en) | 1975-03-19 |
Family
ID=5805003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1374272A Expired GB1388026A (en) | 1971-04-17 | 1972-03-23 | Appratus for the optical-electrical scanning of a drawing |
Country Status (14)
Country | Link |
---|---|
US (1) | US3783275A (en) |
AT (1) | AT322646B (en) |
BE (1) | BE782210A (en) |
CH (1) | CH553452A (en) |
CS (1) | CS161945B2 (en) |
DD (1) | DD99494A5 (en) |
DE (1) | DE2118720A1 (en) |
ES (1) | ES402698A1 (en) |
FR (1) | FR2136475A5 (en) |
GB (1) | GB1388026A (en) |
IL (1) | IL39140A (en) |
IT (1) | IT951426B (en) |
NL (1) | NL7204478A (en) |
ZA (1) | ZA722304B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5140413A (en) * | 1986-11-14 | 1992-08-18 | Canon Kabushiki Kaisha | Image processing apparatus including processing means for moving image and performing conversion |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2544703C3 (en) * | 1975-10-07 | 1978-04-06 | Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel | Method and circuit arrangement for recognizing the colors of a colored surface |
JPS52144459A (en) * | 1976-05-28 | 1977-12-01 | Silver Seiko | Setting method of needle selection unit for knitting machine |
CH646788A5 (en) * | 1978-11-28 | 1984-12-14 | Hell Rudolf Dr Ing Gmbh | METHOD AND CIRCUIT FOR DETECTING COLORS. |
JPS6052429B2 (en) * | 1979-02-28 | 1985-11-19 | 大日本スクリ−ン製造株式会社 | Color correction calculation method |
JPS5660439A (en) * | 1979-10-22 | 1981-05-25 | Dainippon Screen Mfg Co Ltd | Color separation method |
FR2542540B1 (en) * | 1983-03-08 | 1989-02-10 | Canon Kk | IMAGE PROCESSING SYSTEM |
EP0144461B1 (en) * | 1983-12-14 | 1987-05-20 | DR.-ING. RUDOLF HELL GmbH | Method of and circuit arrangement for the recognition of chrominances and colours |
DE3374343D1 (en) * | 1983-12-14 | 1987-12-10 | Hell Rudolf Dr Ing Gmbh | Method of and device for making colour separations in one-colour printing |
DE3372140D1 (en) * | 1983-12-14 | 1987-07-23 | Hell Rudolf Dr Ing Gmbh | Method of and device for making colour separations in single colour printing |
CA1281363C (en) * | 1986-11-14 | 1991-03-12 | Yasumichi Suzuki | Color image processing apparatus |
EP0741490B1 (en) * | 1995-05-05 | 2000-11-15 | Agfa-Gevaert N.V. | High fidelity color rendering method avoiding moire problems |
ES2142438T3 (en) * | 1995-10-13 | 2000-04-16 | Schablonentechnik Kufstein Ag | PROCEDURE FOR MAKING A TEMPLATE, ESPECIALLY FOR PRINTING ON PAPER OR FABRICS. |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3003388A (en) * | 1958-05-09 | 1961-10-10 | Hunter Associates Lab Inc | Color difference measuring instrument |
US3389265A (en) * | 1965-05-03 | 1968-06-18 | Du Pont | Colorimeter for measuring the tristimulus coefficients of color in a laterally moving material |
DE1462806A1 (en) * | 1966-12-27 | 1969-01-09 | Morat Gmbh Franz | Device for producing a programmed strip by optically scanning a drawn template |
US3527540A (en) * | 1967-05-08 | 1970-09-08 | Itek Corp | Color concentration discriminators |
-
1971
- 1971-04-17 DE DE19712118720 patent/DE2118720A1/en active Pending
-
1972
- 1972-03-20 AT AT236472A patent/AT322646B/en not_active IP Right Cessation
- 1972-03-23 GB GB1374272A patent/GB1388026A/en not_active Expired
- 1972-03-27 CH CH454572A patent/CH553452A/en not_active IP Right Cessation
- 1972-04-04 IL IL39140A patent/IL39140A/en unknown
- 1972-04-04 NL NL7204478A patent/NL7204478A/xx unknown
- 1972-04-05 ZA ZA722304A patent/ZA722304B/en unknown
- 1972-04-07 US US00242071A patent/US3783275A/en not_active Expired - Lifetime
- 1972-04-13 DD DD162274A patent/DD99494A5/xx unknown
- 1972-04-15 IT IT23158/72A patent/IT951426B/en active
- 1972-04-15 ES ES402698A patent/ES402698A1/en not_active Expired
- 1972-04-17 CS CS2569A patent/CS161945B2/cs unknown
- 1972-04-17 FR FR7213451A patent/FR2136475A5/fr not_active Expired
- 1972-04-17 BE BE782210A patent/BE782210A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5140413A (en) * | 1986-11-14 | 1992-08-18 | Canon Kabushiki Kaisha | Image processing apparatus including processing means for moving image and performing conversion |
Also Published As
Publication number | Publication date |
---|---|
AT322646B (en) | 1975-05-26 |
CH553452A (en) | 1974-08-30 |
IL39140A0 (en) | 1972-06-28 |
CS161945B2 (en) | 1975-06-10 |
FR2136475A5 (en) | 1972-12-22 |
ES402698A1 (en) | 1975-10-01 |
US3783275A (en) | 1974-01-01 |
ZA722304B (en) | 1973-06-27 |
DD99494A5 (en) | 1973-08-05 |
DE2118720A1 (en) | 1972-11-16 |
NL7204478A (en) | 1972-10-19 |
IL39140A (en) | 1975-11-25 |
BE782210A (en) | 1972-10-17 |
IT951426B (en) | 1973-06-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1388026A (en) | Appratus for the optical-electrical scanning of a drawing | |
US3867039A (en) | Color monitor for continuous process control | |
US4805010A (en) | Still video camera with common circuit for color balance and exposure control | |
US4461175A (en) | Liquid level scale changeover measuring apparatus | |
US2686452A (en) | Color matching apparatus | |
US4103177A (en) | Surface quality analysis | |
US4652738A (en) | Edge detecting device in optical measuring instrument | |
US2455116A (en) | Method of and apparatus for measuring the color quality of light | |
US3790288A (en) | Photometer including variable amplification and dark current compensation | |
US3997845A (en) | Device for modifying an analog electric signal | |
US2882785A (en) | Photoelectric grading instrument | |
GB1422563A (en) | Measuring the degree of dirt accumulation on an article | |
US3744919A (en) | Color measuring with memory | |
US3623816A (en) | System for measurement of relative color intensities | |
US4060328A (en) | System for measuring the modulation transfer function of an optical device | |
US3529895A (en) | Automatic limit colorimeter | |
US3755680A (en) | Flame color signature apparatus | |
JPS5929806B2 (en) | Steel plate temperature distribution measuring device | |
US2540179A (en) | Signal indicating system | |
US4502073A (en) | Noise suppressing interface circuit in a kinescope bias control system | |
US4236178A (en) | Electron microscope with brightness/contrast indicator | |
US3960452A (en) | Color monitor utilizing ambient light illumination | |
GB966531A (en) | Apparatus and method for improving the resolving power of analytical instruments | |
JP4082166B2 (en) | Photodetection device, projector, photodetection method, program, and recording medium | |
US4864386A (en) | Double display mode for differential gain |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |