GB1273360A - Color reproduction system - Google Patents
Color reproduction systemInfo
- Publication number
- GB1273360A GB1273360A GB2237469A GB2237469A GB1273360A GB 1273360 A GB1273360 A GB 1273360A GB 2237469 A GB2237469 A GB 2237469A GB 2237469 A GB2237469 A GB 2237469A GB 1273360 A GB1273360 A GB 1273360A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- colour
- signal
- signals
- reproduction
- 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
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6016—Conversion to subtractive colour signals
- H04N1/6022—Generating a fourth subtractive colour signal, e.g. under colour removal, black masking
-
- 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
- H04N1/48—Picture signal generators
- H04N1/486—Picture signal generators with separate detectors, each detector being used for one specific colour component
- H04N1/488—Picture signal generators with separate detectors, each detector being used for one specific colour component using beam-splitters
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Scanning Arrangements (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
1,273,360. Facsimile apparatus. MATSUSHITA ELECTRIC INDUSTRIAL CO. Ltd. 1 May, 1969 [2 May, 1968; 14 May, 1968; 4 June, 1968 (5)], No. 22374/69. Heading H4F. [Also in Divisions G1 and G4] In a system for the reproduction of an original print by the subtractive or additive method of colour reproduction, the original is viewed photo-electrically to produce three primary colour signals and various colour corrections are carried out on these signals before reproduction is carried out. The photo-electric detector circuit includes means to chop the detector outputs and to increase the S/N ratio. Light transmitted through or reflected by the original 1 is directed through a slit 7 to a three-part dichroic prism arrangement 8 having two dichroic planes 9, 10 by which green, blue and red light are directed via colour fillers 11 to photomultipliers 12 G , 12 B and 12 R respectively Fig. 2C (not shown). The resultant electric signals are passed through substantially identical colour correction channels. Considering the red channel only, the signal is initially chopped in circuit 13 R and amplified by circuit 14 R . After rectification in 15 R , the signal is rendered logarithmic by circuit 16 R so that colour correction operations may be performed The first two corrections are for γ (contrast) and highlight level and are performed by circuits 17 R , 18 R . In the masking circuit 19, in which signals from all three channels are combined, errors in the signals due to defects in the dichroic system, filters, sensitive materials used in reproduction, printing ink colours, &c., are removed. The operation involved for the red channel is subtraction of voltages derived from the green and blue channels from the red signal. In under colour removal (UCR) circuit 20 R , the amount of black in the red signal above a predetermined level set by circuit 202 is subtracted from the signal. The output of 20 R is amplified in 21 R and a selected colour channel output can be passed through anti-logarithmic circuit 22 to derived a printing (exposure signal. A black print signal may also be fed to anti-logarithmic circuit 22 being derived from the marking circuit 19 and being connected by its own highlight, γ and UCR circuits. The various circuits are detailed in Figs. 2a and 3-10 (not shown) with explanatory diagrams. The photomultiplier circuit, Fig. 2a (not shown), includes an astable multivibrator, (13a) generating a pulse waveform which is differentiated before supplying flip-flop (13b) which supplies the photomultiplier final dynode (39). Cancellation of induced noise is by applying a further rectangular wave to the anode through a capacitance (Co).
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2994868 | 1968-05-02 | ||
JP3233568 | 1968-05-14 | ||
JP3894168 | 1968-06-04 | ||
JP3894468 | 1968-06-04 | ||
JP3894368 | 1968-06-04 | ||
JP3894268 | 1968-06-04 | ||
JP3894568 | 1968-06-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1273360A true GB1273360A (en) | 1972-05-10 |
Family
ID=27564234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2237469A Expired GB1273360A (en) | 1968-05-02 | 1969-05-01 | Color reproduction system |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE1922615B2 (en) |
FR (1) | FR2009849A1 (en) |
GB (1) | GB1273360A (en) |
NL (1) | NL6906727A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1983002869A1 (en) * | 1982-02-12 | 1983-08-18 | Watt, Peter, Bernard | Improvements in and relating to colour scanners |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5111308A (en) * | 1986-05-02 | 1992-05-05 | Scitex Corporation Ltd. | Method of incorporating a scanned image into a page layout |
IL78674A0 (en) * | 1986-05-02 | 1986-08-31 | Scitex Corp Ltd | Scanner |
IL78675A (en) * | 1986-05-02 | 1993-02-21 | Scitex Corp Ltd | Color separation scanner |
US5592309A (en) * | 1986-05-02 | 1997-01-07 | Scitex Corporation Ltd. | Multiple lens separation scanner |
US5157516A (en) * | 1987-04-30 | 1992-10-20 | Scitex Corporation Ltd. | Method of incorporating a scanned image into a page layout |
DE3810826A1 (en) * | 1988-03-30 | 1989-10-12 | Pierburg Gmbh | Solenoid injection valve for internal combustion engines |
DE19714886B4 (en) * | 1996-04-10 | 2007-10-11 | Bts Holding International B.V. | Video signal processing circuit |
-
1969
- 1969-05-01 GB GB2237469A patent/GB1273360A/en not_active Expired
- 1969-05-02 NL NL6906727A patent/NL6906727A/xx unknown
- 1969-05-02 FR FR6914087A patent/FR2009849A1/en not_active Withdrawn
- 1969-05-02 DE DE19691922615 patent/DE1922615B2/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1983002869A1 (en) * | 1982-02-12 | 1983-08-18 | Watt, Peter, Bernard | Improvements in and relating to colour scanners |
US4586076A (en) * | 1982-02-12 | 1986-04-29 | Eastman Kodak Company | Scanner optics for containing scattered light |
Also Published As
Publication number | Publication date |
---|---|
DE1922615B2 (en) | 1976-05-20 |
FR2009849A1 (en) | 1970-02-13 |
DE1922615A1 (en) | 1970-01-02 |
NL6906727A (en) | 1969-11-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |