JPS5493329A - White level set system - Google Patents

White level set system

Info

Publication number
JPS5493329A
JPS5493329A JP15792677A JP15792677A JPS5493329A JP S5493329 A JPS5493329 A JP S5493329A JP 15792677 A JP15792677 A JP 15792677A JP 15792677 A JP15792677 A JP 15792677A JP S5493329 A JPS5493329 A JP S5493329A
Authority
JP
Japan
Prior art keywords
white level
character
voltage
fed
video 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.)
Pending
Application number
JP15792677A
Other languages
Japanese (ja)
Inventor
Kamao Kanemitsu
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP15792677A priority Critical patent/JPS5493329A/en
Publication of JPS5493329A publication Critical patent/JPS5493329A/en
Pending legal-status Critical Current

Links

Landscapes

  • Character Input (AREA)

Abstract

PURPOSE: To ensure to perform the identification of character each part, by outputting the white level correction signal of the analog video signal of characters according to the character conditions from the computer and by performing the adjustment of white level with D/A coversion.
CONSTITUTION: To the character conditions such as types of character which are the objective of recognition and writing tools, the optimum white level is checked in advance, and the correction signal which makes the white level of video signal from the image sensor into the optimum white level is memorized in the CPU 5. The correction signal corresponding to the character conditions to recognize is fed from CPU 5 and it is converted into the analog voltage Va with the D/A converter 6. The voltage Va is fed to the negative terminals of the operational amplifier 4 and the video signal V2 from the image sensor is fed to the same terminal via the resistor R2. Taking the feedback resistor as R3, the output voltage V3 is expressed as equation-(2). The voltage V2 can automatically be to the value suitable for each field by the voltage Va, allowing to ensure the character recognition better.
COPYRIGHT: (C)1979,JPO&Japio
JP15792677A 1977-12-30 1977-12-30 White level set system Pending JPS5493329A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15792677A JPS5493329A (en) 1977-12-30 1977-12-30 White level set system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15792677A JPS5493329A (en) 1977-12-30 1977-12-30 White level set system

Publications (1)

Publication Number Publication Date
JPS5493329A true JPS5493329A (en) 1979-07-24

Family

ID=15660478

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15792677A Pending JPS5493329A (en) 1977-12-30 1977-12-30 White level set system

Country Status (1)

Country Link
JP (1) JPS5493329A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5075743A (en) * 1973-11-07 1975-06-21

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5075743A (en) * 1973-11-07 1975-06-21

Similar Documents

Publication Publication Date Title
JPS5529222A (en) Regulating device for excitation
JPS5493329A (en) White level set system
IL61059A (en) Method of current limitation and control for externally controlled,connected d.c.voltage transformers
JPS5523515A (en) Electronic circuit
JPS5529832A (en) Camera focus indicator
JPS5417623A (en) Scanning-speed modulator circuit
JPS5455156A (en) Analog-to-digital converter
JPS5675775A (en) Facsimile device
JPS55112560A (en) Ion concentration automatic measuring unit
JPS54109236A (en) Air pollution control apparatus
JPS52143833A (en) Method and device for charging by corona discharge
JPS55149846A (en) Function generator
ATE597T1 (en) METHOD OF CORRECTING THE SENSITIVITY OF THE WEIGHING DEVICE OF ELECTRICAL WEIGHING EQUIPMENT AND CIRCUIT ARRANGEMENT FOR PERFORMING THE METHOD.
JPS6412723A (en) A/d converter with clamping circuit
JPS57164603A (en) Amplifier
JPS5651611A (en) Ad converter for fetching air flow sensor output
JPS54148305A (en) Voice recognition device
JPS5587957A (en) Voltage detection circuit
JPS55143451A (en) Signal level measuring instrument
JPS5591212A (en) Direct current amplifier circuit
JPS5583336A (en) Digital-to-analog converter
JPS5761384A (en) Image signal processing circuit
JPS5687828A (en) Infrared ray sensor
JPS5562367A (en) Test device for patient supervisory unit
JPS55114033A (en) Range conversion system