JPS6486280A - Gradation converting circuit by look-up table - Google Patents

Gradation converting circuit by look-up table

Info

Publication number
JPS6486280A
JPS6486280A JP62245680A JP24568087A JPS6486280A JP S6486280 A JPS6486280 A JP S6486280A JP 62245680 A JP62245680 A JP 62245680A JP 24568087 A JP24568087 A JP 24568087A JP S6486280 A JPS6486280 A JP S6486280A
Authority
JP
Japan
Prior art keywords
look
random number
tables
picture element
random
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
JP62245680A
Other languages
Japanese (ja)
Other versions
JPH0624005B2 (en
Inventor
Makoto Hirozawa
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.)
Dainippon Screen Manufacturing Co Ltd
Original Assignee
Dainippon Screen Manufacturing 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 Dainippon Screen Manufacturing Co Ltd filed Critical Dainippon Screen Manufacturing Co Ltd
Priority to JP62245680A priority Critical patent/JPH0624005B2/en
Priority to US07/249,984 priority patent/US5123059A/en
Priority to DE3853117T priority patent/DE3853117T2/en
Priority to EP88115978A priority patent/EP0310021B1/en
Publication of JPS6486280A publication Critical patent/JPS6486280A/en
Publication of JPH0624005B2 publication Critical patent/JPH0624005B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To decrease the influence of a noise without increasing the bit number of a picture element signal by preparing the plural number of look-up tables, whose input/output converting characteristics are mutually different, and selecting the look-up table to be used at random. CONSTITUTION:A gradation converting circuit 7 provides look-up tables LUT1-LUTN and a random number generating circuit 10 which individually outputs a selecting signal to select one look-up table at random out of these look-up tables LUT1-LUTN as random number data to the respective look-up tables. In each input of a clock to correspond to the picture element signal corresponding to one picture element part, the random number generating circuit 10 renews the random number data to be outputted. From the selected look-up table, output data are outputted according to the input/output converting characteristic of this look-up table.
JP62245680A 1987-09-28 1987-09-28 Gradation conversion circuit using lookup table Expired - Lifetime JPH0624005B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP62245680A JPH0624005B2 (en) 1987-09-28 1987-09-28 Gradation conversion circuit using lookup table
US07/249,984 US5123059A (en) 1987-09-28 1988-09-27 Gradation converting circuit employing lookup table
DE3853117T DE3853117T2 (en) 1987-09-28 1988-09-28 Gradation conversion circuit using a look-up table.
EP88115978A EP0310021B1 (en) 1987-09-28 1988-09-28 Gradation converting circuit employing lookup table

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62245680A JPH0624005B2 (en) 1987-09-28 1987-09-28 Gradation conversion circuit using lookup table

Publications (2)

Publication Number Publication Date
JPS6486280A true JPS6486280A (en) 1989-03-30
JPH0624005B2 JPH0624005B2 (en) 1994-03-30

Family

ID=17137212

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62245680A Expired - Lifetime JPH0624005B2 (en) 1987-09-28 1987-09-28 Gradation conversion circuit using lookup table

Country Status (1)

Country Link
JP (1) JPH0624005B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014110502A (en) * 2012-11-30 2014-06-12 Kyocera Document Solutions Inc Image processor and image processing program
JP2014110499A (en) * 2012-11-30 2014-06-12 Kyocera Document Solutions Inc Image processor and image processing program

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014110502A (en) * 2012-11-30 2014-06-12 Kyocera Document Solutions Inc Image processor and image processing program
JP2014110499A (en) * 2012-11-30 2014-06-12 Kyocera Document Solutions Inc Image processor and image processing program

Also Published As

Publication number Publication date
JPH0624005B2 (en) 1994-03-30

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