JPS5737975A - Binary coding equipment for video signal - Google Patents

Binary coding equipment for video signal

Info

Publication number
JPS5737975A
JPS5737975A JP11284480A JP11284480A JPS5737975A JP S5737975 A JPS5737975 A JP S5737975A JP 11284480 A JP11284480 A JP 11284480A JP 11284480 A JP11284480 A JP 11284480A JP S5737975 A JPS5737975 A JP S5737975A
Authority
JP
Japan
Prior art keywords
shading
referential
video signal
read
data
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
JP11284480A
Other languages
Japanese (ja)
Inventor
Mamoru Maeda
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP11284480A priority Critical patent/JPS5737975A/en
Publication of JPS5737975A publication Critical patent/JPS5737975A/en
Pending legal-status Critical Current

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
    • H04N1/40—Picture signal circuits
    • H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original

Abstract

PURPOSE:To obtain accurate shading correcting even when A/D conversions having small resolutions are used and, at the same time, to reduce cost, by previously processing shading characteristics of a reader into signals representing differences from referential set values. CONSTITUTION:Before reading an original to be transmitted, a referential white mark is read and encoded data of the shading characteristics of a reader is stored in a memory 14. When the orignal is read, encoded data is read out from the referential mark stored in the memory 14 in advance, and the readout data in added to a referential set value after the data is D/A-converted. In this way, shading waveforms are reproduced, and a threshold level S10 are produced from the values. By comparing the threshold level S10 with a video signal S4 of the original by a comparator 16, a binary coded signal of the video signal is obtained. Therefore, accurate binary coded output which is not influenced from the shading characteristic is obtained.
JP11284480A 1980-08-16 1980-08-16 Binary coding equipment for video signal Pending JPS5737975A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11284480A JPS5737975A (en) 1980-08-16 1980-08-16 Binary coding equipment for video signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11284480A JPS5737975A (en) 1980-08-16 1980-08-16 Binary coding equipment for video signal

Publications (1)

Publication Number Publication Date
JPS5737975A true JPS5737975A (en) 1982-03-02

Family

ID=14596940

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11284480A Pending JPS5737975A (en) 1980-08-16 1980-08-16 Binary coding equipment for video signal

Country Status (1)

Country Link
JP (1) JPS5737975A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0158409A2 (en) * 1984-04-05 1985-10-16 The British Library Board Improved threshold detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0158409A2 (en) * 1984-04-05 1985-10-16 The British Library Board Improved threshold detector
EP0158409A3 (en) * 1984-04-05 1988-03-23 The British Library Board Improved threshold detector

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