JPS5556762A - Picture element signal conversion method for digital reproducer - Google Patents

Picture element signal conversion method for digital reproducer

Info

Publication number
JPS5556762A
JPS5556762A JP13026178A JP13026178A JPS5556762A JP S5556762 A JPS5556762 A JP S5556762A JP 13026178 A JP13026178 A JP 13026178A JP 13026178 A JP13026178 A JP 13026178A JP S5556762 A JPS5556762 A JP S5556762A
Authority
JP
Japan
Prior art keywords
picture element
density
max
scanning
value
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
JP13026178A
Other languages
Japanese (ja)
Inventor
Keiji Sekikawa
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 JP13026178A priority Critical patent/JPS5556762A/en
Publication of JPS5556762A publication Critical patent/JPS5556762A/en
Pending legal-status Critical Current

Links

Landscapes

  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE: To increase the contrast between the texture part and the scanning part by carrying out the density conversion to the picture element density signals obtained through the 1-line scanning in accordance with the highest density value among the picture element density signals in case the conversion is given to the picture element signals of the digital reproducer, thus obtaining a high-contrast picture.
CONSTITUTION: Picture element density signal X obtained through the scanning is supplied to highest density detector 2 from sensor 1 to detect highest density value Xmax, and furthermore memorized in temporary memory 3 with reception of the address indication from address indicator 4. Density value X is defined as Xmax when larger than the detected value Xmax; while X is made constant when smaller than Xmax. The same operation is given also to the density value obtained through the next scanning for memorization. When the process equivalent to one line is over, signal X memorized in memory 3 is drawn out. And conversion density value X' is obtained through the operation by picture element signal converter 5 and then compared with set value XD through comparator 6. Then the white or black dot is delivered according to the result of the comparison. The output signal thus processed is supplied to output device 8 via output buffer 7, thus high-contrast pictures are obtained in sequence.
COPYRIGHT: (C)1980,JPO&Japio
JP13026178A 1978-10-23 1978-10-23 Picture element signal conversion method for digital reproducer Pending JPS5556762A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13026178A JPS5556762A (en) 1978-10-23 1978-10-23 Picture element signal conversion method for digital reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13026178A JPS5556762A (en) 1978-10-23 1978-10-23 Picture element signal conversion method for digital reproducer

Publications (1)

Publication Number Publication Date
JPS5556762A true JPS5556762A (en) 1980-04-25

Family

ID=15030028

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13026178A Pending JPS5556762A (en) 1978-10-23 1978-10-23 Picture element signal conversion method for digital reproducer

Country Status (1)

Country Link
JP (1) JPS5556762A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5713858A (en) * 1980-06-28 1982-01-23 Nec Corp Adaptive quantization device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5713858A (en) * 1980-06-28 1982-01-23 Nec Corp Adaptive quantization device
JPH0117311B2 (en) * 1980-06-28 1989-03-29 Nippon Electric Co

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