JPS56165462A - Picture processing system - Google Patents

Picture processing system

Info

Publication number
JPS56165462A
JPS56165462A JP6857480A JP6857480A JPS56165462A JP S56165462 A JPS56165462 A JP S56165462A JP 6857480 A JP6857480 A JP 6857480A JP 6857480 A JP6857480 A JP 6857480A JP S56165462 A JPS56165462 A JP S56165462A
Authority
JP
Japan
Prior art keywords
scanning line
output
density
density level
input
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
JP6857480A
Other languages
Japanese (ja)
Inventor
Morizumi Kurose
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 JP6857480A priority Critical patent/JPS56165462A/en
Publication of JPS56165462A publication Critical patent/JPS56165462A/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

Abstract

PURPOSE:To improve the quality of a picture, by setting the output density level at a certain value up to a certain level of density and giving a linear increse to the output density level when the value exceeds the input density level. CONSTITUTION:The input picture signal Si is supplied successively to an adder 40 and integrated in the timing of a clock signal. A divider 41 functions to obtain an average of the result of integration equivalent to a scanning line, and the density level alpha is decided by the output of the divider 41. Both this division and the input to a memory 44 or 45 are carried out in the timing from a completion of addition equivalent to a scanning line of the adder 40 through a start of addition of the next scanning line. Buffer resisters 42 and 43 can accumulate the information equivalent to a scanning line respectively, and work alternately by a command of a control device. The memories 44 and 45 accumulate respectively the average density information of a scanning line corresponding to the registers 42 and 43. A code converter 47 calculates a curve of compensation shown in the figure by the output alpha of a selector 46.
JP6857480A 1980-05-23 1980-05-23 Picture processing system Pending JPS56165462A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6857480A JPS56165462A (en) 1980-05-23 1980-05-23 Picture processing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6857480A JPS56165462A (en) 1980-05-23 1980-05-23 Picture processing system

Publications (1)

Publication Number Publication Date
JPS56165462A true JPS56165462A (en) 1981-12-19

Family

ID=13377673

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6857480A Pending JPS56165462A (en) 1980-05-23 1980-05-23 Picture processing system

Country Status (1)

Country Link
JP (1) JPS56165462A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5933970A (en) * 1982-08-18 1984-02-24 Matsushita Electric Ind Co Ltd Picture signal processor
JPS6297474A (en) * 1985-10-23 1987-05-06 Toshiba Corp Image processor
US4975768A (en) * 1987-12-09 1990-12-04 Canon Kabushiki Kaisha Image signal processing with suppression of background portion of image

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5933970A (en) * 1982-08-18 1984-02-24 Matsushita Electric Ind Co Ltd Picture signal processor
JPH0129348B2 (en) * 1982-08-18 1989-06-09 Matsushita Denki Sangyo Kk
JPS6297474A (en) * 1985-10-23 1987-05-06 Toshiba Corp Image processor
US4975768A (en) * 1987-12-09 1990-12-04 Canon Kabushiki Kaisha Image signal processing with suppression of background portion of image

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