JPS6476177A - Reading threshold setting system - Google Patents

Reading threshold setting system

Info

Publication number
JPS6476177A
JPS6476177A JP62232152A JP23215287A JPS6476177A JP S6476177 A JPS6476177 A JP S6476177A JP 62232152 A JP62232152 A JP 62232152A JP 23215287 A JP23215287 A JP 23215287A JP S6476177 A JPS6476177 A JP S6476177A
Authority
JP
Japan
Prior art keywords
threshold
comparator
threshold setting
setting system
held
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
JP62232152A
Other languages
Japanese (ja)
Inventor
Masahiro Oikawa
Tsugio Takahashi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62232152A priority Critical patent/JPS6476177A/en
Publication of JPS6476177A publication Critical patent/JPS6476177A/en
Pending legal-status Critical Current

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  • Character Input (AREA)

Abstract

PURPOSE:To improve the fetching accuracy of a constantly stable character or picture information by reading a test sheet and automatically setting and holding a threshold. CONSTITUTION:The test sheet 1 on which the mark of a previously designated density is illuminated by a light source 2 to form an image on a photoelectric converting element 4 by a lens 3. The output of this photoelectric converting element 4 is applied to a comparator 7 through an amplifier 5 and a sample-hold circuit 6. The threshold of this comparator 7 is automatically varied so as to have the prescribed fetching accuracy and held. At the time of using the device, this held threshold is used every time.
JP62232152A 1987-09-18 1987-09-18 Reading threshold setting system Pending JPS6476177A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62232152A JPS6476177A (en) 1987-09-18 1987-09-18 Reading threshold setting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62232152A JPS6476177A (en) 1987-09-18 1987-09-18 Reading threshold setting system

Publications (1)

Publication Number Publication Date
JPS6476177A true JPS6476177A (en) 1989-03-22

Family

ID=16934811

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62232152A Pending JPS6476177A (en) 1987-09-18 1987-09-18 Reading threshold setting system

Country Status (1)

Country Link
JP (1) JPS6476177A (en)

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