JPH01213073A - Copying device - Google Patents

Copying device

Info

Publication number
JPH01213073A
JPH01213073A JP63037572A JP3757288A JPH01213073A JP H01213073 A JPH01213073 A JP H01213073A JP 63037572 A JP63037572 A JP 63037572A JP 3757288 A JP3757288 A JP 3757288A JP H01213073 A JPH01213073 A JP H01213073A
Authority
JP
Japan
Prior art keywords
density
grounding
signals
circuit
picture
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
JP63037572A
Other versions
JP2786195B2 (en
Inventor
Akihiro Usami
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP63037572A priority Critical patent/JP2786195B2/en
Publication of JPH01213073A publication Critical patent/JPH01213073A/en
Application granted granted Critical
Publication of JP2786195B2 publication Critical patent/JP2786195B2/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Abstract

PURPOSE:To restrain only a grounding or a part thinner than the density of the grounding in a popied picture from being copied, or to copy them by the prescribed density by detecting the density of the grounding of the original picture, and converting the grounding and the part thinner than the density of the grounding into the prescribed density. CONSTITUTION:Signals R, G, B outputted from a photoelectric converting element array 1 by the scanning of an optical system unit are supplied to a memory 6 through an A/D converter 2, and a histogram to show the frequency distribution of color density in the original picture is generated by a CPU 7. This histogram shows high frequency at the density near to white of the grounding of the original, and a conversion table is written in a circuit 3 as referring to a threshold, and the signals R, G, B are converted into the signals R', G', B' according to a conversion function, and are inputted to a density conversion circuit 4. The circuit 4 converts the inputted signals into the density signals C', M', Y', and further, color correction processing is performed by a color correction circuit 5, and the signals of C'', M'', Y'', Bk'' corresponding to cyan, magenta, yellow and black are outputted. Thus, only the grounding or the part thinner than the grounding density of the copied picture can be copied by the prescribed density.
JP63037572A 1988-02-22 1988-02-22 The color image processing apparatus Expired - Lifetime JP2786195B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63037572A JP2786195B2 (en) 1988-02-22 1988-02-22 The color image processing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63037572A JP2786195B2 (en) 1988-02-22 1988-02-22 The color image processing apparatus

Publications (2)

Publication Number Publication Date
JPH01213073A true JPH01213073A (en) 1989-08-25
JP2786195B2 JP2786195B2 (en) 1998-08-13

Family

ID=12501244

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63037572A Expired - Lifetime JP2786195B2 (en) 1988-02-22 1988-02-22 The color image processing apparatus

Country Status (1)

Country Link
JP (1) JP2786195B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6807301B1 (en) 2000-02-25 2004-10-19 Fujitsu Limited Image production controlling device, image producing device, image production controlling method, and a storage medium
JP2009193429A (en) * 2008-02-15 2009-08-27 Mitsubishi Electric Corp Image reading device
JP2010244331A (en) * 2009-04-07 2010-10-28 Mitsubishi Electric Corp Image reading device
US20170064147A1 (en) * 2015-08-26 2017-03-02 Canon Kabushiki Kaisha Image processing apparatus, method of controlling the same, and storage medium

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01196975A (en) * 1988-01-30 1989-08-08 Konica Corp Color picture processor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01196975A (en) * 1988-01-30 1989-08-08 Konica Corp Color picture processor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6807301B1 (en) 2000-02-25 2004-10-19 Fujitsu Limited Image production controlling device, image producing device, image production controlling method, and a storage medium
JP2009193429A (en) * 2008-02-15 2009-08-27 Mitsubishi Electric Corp Image reading device
JP2010244331A (en) * 2009-04-07 2010-10-28 Mitsubishi Electric Corp Image reading device
US20170064147A1 (en) * 2015-08-26 2017-03-02 Canon Kabushiki Kaisha Image processing apparatus, method of controlling the same, and storage medium
US10033908B2 (en) * 2015-08-26 2018-07-24 Canon Kabushiki Kaisha Image processing apparatus with removal of under-color background image, method of controlling the same, and storage medium
US10404893B2 (en) 2015-08-26 2019-09-03 Canon Kabushiki Kaisha Image processing apparatus, control method, and program storage medium that convert gray highlight color values from not targeted to being targeted for background color removal

Also Published As

Publication number Publication date
JP2786195B2 (en) 1998-08-13

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