JPS5558670A - Picture processing system - Google Patents

Picture processing system

Info

Publication number
JPS5558670A
JPS5558670A JP13119078A JP13119078A JPS5558670A JP S5558670 A JPS5558670 A JP S5558670A JP 13119078 A JP13119078 A JP 13119078A JP 13119078 A JP13119078 A JP 13119078A JP S5558670 A JPS5558670 A JP S5558670A
Authority
JP
Japan
Prior art keywords
picture element
level
density
element region
detected
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
JP13119078A
Other languages
Japanese (ja)
Inventor
Koichi Ejiri
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 JP13119078A priority Critical patent/JPS5558670A/en
Publication of JPS5558670A publication Critical patent/JPS5558670A/en
Pending legal-status Critical Current

Links

Landscapes

  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE: To eliminate granular noise and background dirt noise by performing density gradation correction according to the difference between the average level in the first specific picture element region adjacent to a noticed picture element and the minimum level in the second specific picture element region near the noticed picture element which is wider than the first specific picture element region above.
CONSTITUTION: Each picture element density of picture signals is sampled by A.D converter 1, and cumulative density frequency distribution for every sampling level in the first specific picture element region adjacent to noticed picture element S is taken according to the output of converter 1 by combination of adder 2 and memory 3, and density level a corresponding to the center value is detected. Then, the output converter 1 is sent to buffer memory 4, and picture signals of the second specific picture element region are accumulated there, and next, minimum density level c in the region is detected by comparator 5. Simultaneously, maximum and minimum densities d and e for every line are detected by comparator 5, and average values -d and -e are calculated by averaging circuit 6. Finally, operator 7 executes a prescribed operation on a basis of these outputs a, c, -d and -e, thereby performing gradation correction.
COPYRIGHT: (C)1980,JPO&Japio
JP13119078A 1978-10-25 1978-10-25 Picture processing system Pending JPS5558670A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13119078A JPS5558670A (en) 1978-10-25 1978-10-25 Picture processing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13119078A JPS5558670A (en) 1978-10-25 1978-10-25 Picture processing system

Publications (1)

Publication Number Publication Date
JPS5558670A true JPS5558670A (en) 1980-05-01

Family

ID=15052115

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13119078A Pending JPS5558670A (en) 1978-10-25 1978-10-25 Picture processing system

Country Status (1)

Country Link
JP (1) JPS5558670A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5144456A (en) * 1989-01-21 1992-09-01 Ricoh Company, Ltd. Image processing apparatus and method
CN112738365A (en) * 2015-07-16 2021-04-30 索尼公司 Imaging apparatus and information processing system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5144456A (en) * 1989-01-21 1992-09-01 Ricoh Company, Ltd. Image processing apparatus and method
CN112738365A (en) * 2015-07-16 2021-04-30 索尼公司 Imaging apparatus and information processing system
CN112738365B (en) * 2015-07-16 2022-11-18 索尼公司 Imaging apparatus and information processing system

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