JPS57119560A - Binary-coding processing method for analog picture signal - Google Patents

Binary-coding processing method for analog picture signal

Info

Publication number
JPS57119560A
JPS57119560A JP56006060A JP606081A JPS57119560A JP S57119560 A JPS57119560 A JP S57119560A JP 56006060 A JP56006060 A JP 56006060A JP 606081 A JP606081 A JP 606081A JP S57119560 A JPS57119560 A JP S57119560A
Authority
JP
Japan
Prior art keywords
binary
picture
signal
data
address
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.)
Granted
Application number
JP56006060A
Other languages
Japanese (ja)
Other versions
JPH0340552B2 (en
Inventor
Shuichi 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.)
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 JP56006060A priority Critical patent/JPS57119560A/en
Publication of JPS57119560A publication Critical patent/JPS57119560A/en
Publication of JPH0340552B2 publication Critical patent/JPH0340552B2/ja
Granted 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 facilitate the setting of binary-coding processing mode by storing an ROM with gradations which correspond to picture elements in a main and a subordinate scanning direction and comparison data classified by densities, and reading and processing the data by a gradation and a density indication signal. CONSTITUTION:The output of a picture-element address specifying circuit ACC consisting of a subordinate scanning counter CO1 and a main scanning counter CO2 is supplied to an address switching circuit AEC. The AEC inputs a gradaiion control signal and density indication signals to generate the address data of an ROMDMD2. The DMD2 is stored with three kinds of gradation processing comparison-level data which correspond to densities, and three kinds of comparison-level data for simple binary-coding processing and they are read selectively by an address from the AEC and inputted to a D/A converter DA. To the reference voltage terminal of the DA, the output of a circuit PHC which detects and holds the peak value of a picture signal is supplied, and a DA-converted signal is amplified and applied to a comparator CPA for binary coding. The CPA performs the binary coding in conformity with the density of an original picture according to the peak value of an analog picture signal.
JP56006060A 1981-01-19 1981-01-19 Binary-coding processing method for analog picture signal Granted JPS57119560A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56006060A JPS57119560A (en) 1981-01-19 1981-01-19 Binary-coding processing method for analog picture signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56006060A JPS57119560A (en) 1981-01-19 1981-01-19 Binary-coding processing method for analog picture signal

Publications (2)

Publication Number Publication Date
JPS57119560A true JPS57119560A (en) 1982-07-26
JPH0340552B2 JPH0340552B2 (en) 1991-06-19

Family

ID=11628044

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56006060A Granted JPS57119560A (en) 1981-01-19 1981-01-19 Binary-coding processing method for analog picture signal

Country Status (1)

Country Link
JP (1) JPS57119560A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578668A (en) * 1978-12-01 1980-06-13 Xerox Corp Method of and device for processing video

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578668A (en) * 1978-12-01 1980-06-13 Xerox Corp Method of and device for processing video

Also Published As

Publication number Publication date
JPH0340552B2 (en) 1991-06-19

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