JPS55118272A - Picture processing unit - Google Patents

Picture processing unit

Info

Publication number
JPS55118272A
JPS55118272A JP2599579A JP2599579A JPS55118272A JP S55118272 A JPS55118272 A JP S55118272A JP 2599579 A JP2599579 A JP 2599579A JP 2599579 A JP2599579 A JP 2599579A JP S55118272 A JPS55118272 A JP S55118272A
Authority
JP
Japan
Prior art keywords
signal
picture signal
level
background
threshold level
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
JP2599579A
Other languages
Japanese (ja)
Inventor
Shiyuuji Itou
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 JP2599579A priority Critical patent/JPS55118272A/en
Publication of JPS55118272A publication Critical patent/JPS55118272A/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 binarize the picture signal correctly, by optimum setting of the binary threshold level even if the background signal is changed, through the control of the background signal on the level, in the binary threshold level of the picture signal. CONSTITUTION:The picture signal VS converted into electric signal with the photo electric converter 3 is fed to the selection control circuit 8 and the selection signal on the background level from the control circuit 8 is outputted to the analog switch 7 in the timings t1, t2 and t3. Further, the binary threshold levels VTH1, VTH2, VTH3 and VTH4 set respectively to the switch 7 are selected, the set threshold level VTH is fed to the comparator 5, allowing to binarize the picture signal converted with the photo electric converter 3 in optimum state.
JP2599579A 1979-03-05 1979-03-05 Picture processing unit Pending JPS55118272A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2599579A JPS55118272A (en) 1979-03-05 1979-03-05 Picture processing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2599579A JPS55118272A (en) 1979-03-05 1979-03-05 Picture processing unit

Publications (1)

Publication Number Publication Date
JPS55118272A true JPS55118272A (en) 1980-09-11

Family

ID=12181291

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2599579A Pending JPS55118272A (en) 1979-03-05 1979-03-05 Picture processing unit

Country Status (1)

Country Link
JP (1) JPS55118272A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5745531U (en) * 1980-08-29 1982-03-13
EP0064557A1 (en) * 1980-11-17 1982-11-17 Fujitsu Limited Picture signal reading method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5745531U (en) * 1980-08-29 1982-03-13
EP0064557A1 (en) * 1980-11-17 1982-11-17 Fujitsu Limited Picture signal reading method

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