JPS5556764A - Noise elimination method for picture process - Google Patents

Noise elimination method for picture process

Info

Publication number
JPS5556764A
JPS5556764A JP13087278A JP13087278A JPS5556764A JP S5556764 A JPS5556764 A JP S5556764A JP 13087278 A JP13087278 A JP 13087278A JP 13087278 A JP13087278 A JP 13087278A JP S5556764 A JPS5556764 A JP S5556764A
Authority
JP
Japan
Prior art keywords
output
latch
density
cumulative frequency
picture element
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
JP13087278A
Other languages
Japanese (ja)
Other versions
JPS646588B2 (en
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 JP13087278A priority Critical patent/JPS5556764A/en
Publication of JPS5556764A publication Critical patent/JPS5556764A/en
Publication of JPS646588B2 publication Critical patent/JPS646588B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE: To realize an automatic elimination of the texture noise by setting the threshold level through the dynamic calculation of the density distribution with use of the picture elements on the first scanning line from the head to notice picture element.
CONSTITUTION: Counter 3 counts all picture elements on the first scanning line from the head to prescribed picture element to supply them to divider 4 where the cumulative predictive noise picture elements up to the notice picture element are delivered. While the output of latch 1 is supplied to address (1) of RAM5, where the cumulative frequency of the density is read out from the data by using the density level of the input data as the address. At the same time, the 1 count-up is given by adder 9, and thw writing is carried out based on the input data. Then the sequential increment is given from zero for counter 2. With every increment, the cumulative frequency of RAM5 is delivered, and the cumulative frequency distribution is calculated via adder 6 and latch 12. Then the threshold level is calculated when the output of latch 12 becomes larger than the output of divider 4 through comparator 7. As a result, multiplexer 11 is actuated to obtain the desired output.
COPYRIGHT: (C)1980,JPO&Japio
JP13087278A 1978-10-24 1978-10-24 Noise elimination method for picture process Granted JPS5556764A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13087278A JPS5556764A (en) 1978-10-24 1978-10-24 Noise elimination method for picture process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13087278A JPS5556764A (en) 1978-10-24 1978-10-24 Noise elimination method for picture process

Publications (2)

Publication Number Publication Date
JPS5556764A true JPS5556764A (en) 1980-04-25
JPS646588B2 JPS646588B2 (en) 1989-02-03

Family

ID=15044661

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13087278A Granted JPS5556764A (en) 1978-10-24 1978-10-24 Noise elimination method for picture process

Country Status (1)

Country Link
JP (1) JPS5556764A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5373029A (en) * 1976-12-13 1978-06-29 Nippon Telegr & Teleph Corp <Ntt> Binary sampling methid of analog facsimile signal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5373029A (en) * 1976-12-13 1978-06-29 Nippon Telegr & Teleph Corp <Ntt> Binary sampling methid of analog facsimile signal

Also Published As

Publication number Publication date
JPS646588B2 (en) 1989-02-03

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