JPS5666969A - Multigradation recording facsimile equipment - Google Patents

Multigradation recording facsimile equipment

Info

Publication number
JPS5666969A
JPS5666969A JP14201879A JP14201879A JPS5666969A JP S5666969 A JPS5666969 A JP S5666969A JP 14201879 A JP14201879 A JP 14201879A JP 14201879 A JP14201879 A JP 14201879A JP S5666969 A JPS5666969 A JP S5666969A
Authority
JP
Japan
Prior art keywords
level converting
quantization level
converting circuit
circuit
quantization
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
JP14201879A
Other languages
Japanese (ja)
Inventor
Yoshiharu Okino
Yasumasa Shiraishi
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP14201879A priority Critical patent/JPS5666969A/en
Publication of JPS5666969A publication Critical patent/JPS5666969A/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
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H04N1/4072—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on the contents of the original

Abstract

PURPOSE:To get rid of unstableness due to the environmental condition, by digitally correcting the characteristic of the photoelectric conversion part of the multigradation recording facsimile. CONSTITUTION:A light signal from the original 2 is converted to an electric signal by the photoelectric converter Sns, is quantized to (m) value by the A/D converter CONV through the buffer circuit BUF, and it is input to the quantization level converting circuit MEM. The (m) value quantization signal is converted to an (n) value quantization signal of m>n by the quantization level converting circuit MEM. This quantization level converting circuit is used for correcting the characteristic of the photoelectric converter SNS having nonlinearity, and consists of a digital circuit such as ROM which makes (m) the address and outputs (n), etc. Accordingly, this equipment is hard to be influenced by the environmental condition, stable and also inexpensive, comparing with using an analog circuit as its quantization level converting circuit.
JP14201879A 1979-11-05 1979-11-05 Multigradation recording facsimile equipment Pending JPS5666969A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14201879A JPS5666969A (en) 1979-11-05 1979-11-05 Multigradation recording facsimile equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14201879A JPS5666969A (en) 1979-11-05 1979-11-05 Multigradation recording facsimile equipment

Publications (1)

Publication Number Publication Date
JPS5666969A true JPS5666969A (en) 1981-06-05

Family

ID=15305450

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14201879A Pending JPS5666969A (en) 1979-11-05 1979-11-05 Multigradation recording facsimile equipment

Country Status (1)

Country Link
JP (1) JPS5666969A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568955A (en) * 1983-03-31 1986-02-04 Tokyo Shibaura Denki Kabushiki Kaisha Recording apparatus using a toner-fog generated by electric fields applied to electrodes on the surface of the developer carrier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568955A (en) * 1983-03-31 1986-02-04 Tokyo Shibaura Denki Kabushiki Kaisha Recording apparatus using a toner-fog generated by electric fields applied to electrodes on the surface of the developer carrier

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