JPS55131873A - Read system for document - Google Patents
Read system for documentInfo
- Publication number
- JPS55131873A JPS55131873A JP3936879A JP3936879A JPS55131873A JP S55131873 A JPS55131873 A JP S55131873A JP 3936879 A JP3936879 A JP 3936879A JP 3936879 A JP3936879 A JP 3936879A JP S55131873 A JPS55131873 A JP S55131873A
- Authority
- JP
- Japan
- Prior art keywords
- light sources
- document
- red
- white
- yellow
- 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.)
- Pending
Links
Abstract
PURPOSE: To make it possible to read a document accurately by improving S/N by obtaining three primary colors of light by processing a corresponding sensor output while operating light sources for red, white and yellow lights in time-division mode.
CONSTITUTION: Three primary color light sources, white, yellow and red light sources 11...13, are put into operation in time-division mode to irradiate document 1 and information obtained through reflection is led via lens system 14 to photoelectric converting element 15, which converts it into an electronic signal. Its output is sent to analog switch 16 to open the switch sequentially by clock 10 synchronizing with the time-division operations of light sources 11...13 and voltages obtained while light sources 11 ...13 are lighting up the document are held by sample holding elements 17...19 for white, yellow and red colors. Further, sample-held values corresponding to blue and green colors are obtained by amplifiers 20 and 21, and output signals of three primary colors, red, green and blue, are obtained by gate 22. Consequently, document 1 can accurately be read with S/N improved.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3936879A JPS55131873A (en) | 1979-04-03 | 1979-04-03 | Read system for document |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3936879A JPS55131873A (en) | 1979-04-03 | 1979-04-03 | Read system for document |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS55131873A true JPS55131873A (en) | 1980-10-14 |
Family
ID=12551106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3936879A Pending JPS55131873A (en) | 1979-04-03 | 1979-04-03 | Read system for document |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55131873A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56149672A (en) * | 1980-04-15 | 1981-11-19 | Ricoh Co Ltd | Reader of color information |
| US4652913A (en) * | 1983-04-11 | 1987-03-24 | Fuji Xerox Co., Ltd. | Method and apparatus for reading color images using a plurality of color light sources in which one of the light sources is turned on continuously |
| US4658289A (en) * | 1984-01-12 | 1987-04-14 | Sharp Kabushiki Kaisha | Color-picture analyzing apparatus for continuously switching-on green lamp and for alternatively switching-on blue and red-purpose lamps |
| US4670779A (en) * | 1984-01-10 | 1987-06-02 | Sharp Kabushiki Kaisha | Color-picture analyzing apparatus with red-purpose and green-purpose filters |
| JPS62150486A (en) * | 1985-12-24 | 1987-07-04 | Tokyo Electric Co Ltd | barcode scanner |
-
1979
- 1979-04-03 JP JP3936879A patent/JPS55131873A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56149672A (en) * | 1980-04-15 | 1981-11-19 | Ricoh Co Ltd | Reader of color information |
| US4652913A (en) * | 1983-04-11 | 1987-03-24 | Fuji Xerox Co., Ltd. | Method and apparatus for reading color images using a plurality of color light sources in which one of the light sources is turned on continuously |
| US4670779A (en) * | 1984-01-10 | 1987-06-02 | Sharp Kabushiki Kaisha | Color-picture analyzing apparatus with red-purpose and green-purpose filters |
| US4658289A (en) * | 1984-01-12 | 1987-04-14 | Sharp Kabushiki Kaisha | Color-picture analyzing apparatus for continuously switching-on green lamp and for alternatively switching-on blue and red-purpose lamps |
| JPS62150486A (en) * | 1985-12-24 | 1987-07-04 | Tokyo Electric Co Ltd | barcode scanner |
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