JPS562073A - Optical reader - Google Patents

Optical reader

Info

Publication number
JPS562073A
JPS562073A JP7848179A JP7848179A JPS562073A JP S562073 A JPS562073 A JP S562073A JP 7848179 A JP7848179 A JP 7848179A JP 7848179 A JP7848179 A JP 7848179A JP S562073 A JPS562073 A JP S562073A
Authority
JP
Japan
Prior art keywords
white
black
blue
character
wavelength range
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
Application number
JP7848179A
Other languages
Japanese (ja)
Inventor
Taketo Toyoda
Hidetoshi Ueda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP7848179A priority Critical patent/JPS562073A/en
Publication of JPS562073A publication Critical patent/JPS562073A/en
Pending legal-status Critical Current

Links

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  • Character Input (AREA)

Abstract

PURPOSE: To make it possible to consider all parts, judged to be colored by human eyes, to be in dropout color, by a two or three-system photoelectric converting element that has high sensitivity in the wavelength range of blue, green or red.
CONSTITUTION: Spectral reflection factors of white, black, reddish color, and bluish color papers are shown by curves 1, 2, 3 and 4 respectively. When the spectral sensitivity of an optical system is in a wavelength range of red (6,000W7,000Å), photoelectric converting element 5 scans character 50 in black on a sheet, and consequently character frame 51 in blue which should be dropout color changes to black level 53, so that output (a) can be obtained. Next, a photoelectric converting element with high sensitivity in a wavelength range of blue (4,000W5,000Å) in parallel to the above-mentioned scanning scans the character, and consequently the part of character frame 51 has a reflection factor close to that of white and changes to white level 54, thereby obtaining output (b). For the purpose, outputs (a) and (b) are both checked; a decision on black when outputs (a) and (b) are both black or white when white is made to obtain output (c).
COPYRIGHT: (C)1981,JPO&Japio
JP7848179A 1979-06-21 1979-06-21 Optical reader Pending JPS562073A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7848179A JPS562073A (en) 1979-06-21 1979-06-21 Optical reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7848179A JPS562073A (en) 1979-06-21 1979-06-21 Optical reader

Publications (1)

Publication Number Publication Date
JPS562073A true JPS562073A (en) 1981-01-10

Family

ID=13663180

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7848179A Pending JPS562073A (en) 1979-06-21 1979-06-21 Optical reader

Country Status (1)

Country Link
JP (1) JPS562073A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5723181A (en) * 1980-07-18 1982-02-06 Nec Corp Input equipment for character on form patterned with color
JPH04133190A (en) * 1990-09-26 1992-05-07 Toshiba Corp Recognizing system
US5388167A (en) * 1991-03-12 1995-02-07 Hitachi, Ltd. Document image processing system and document image processing method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831864U (en) * 1971-08-21 1973-04-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831864U (en) * 1971-08-21 1973-04-18

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5723181A (en) * 1980-07-18 1982-02-06 Nec Corp Input equipment for character on form patterned with color
JPH04133190A (en) * 1990-09-26 1992-05-07 Toshiba Corp Recognizing system
US5388167A (en) * 1991-03-12 1995-02-07 Hitachi, Ltd. Document image processing system and document image processing method

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