JPS5539484A - Shading distortion correction circuit for facsimile equipment - Google Patents

Shading distortion correction circuit for facsimile equipment

Info

Publication number
JPS5539484A
JPS5539484A JP11385778A JP11385778A JPS5539484A JP S5539484 A JPS5539484 A JP S5539484A JP 11385778 A JP11385778 A JP 11385778A JP 11385778 A JP11385778 A JP 11385778A JP S5539484 A JPS5539484 A JP S5539484A
Authority
JP
Japan
Prior art keywords
shading
signal
output
period
lpf31
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
JP11385778A
Other languages
Japanese (ja)
Inventor
Mitsugi Ikeda
Koji Ueda
Hideji Yanase
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP11385778A priority Critical patent/JPS5539484A/en
Publication of JPS5539484A publication Critical patent/JPS5539484A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To give correction to the distortion caused by the filter when the analog signal showing the shading is reloaded, by memorizing and holding concurrently the frequency corresponding to the fixed level of the period immediately before the shading properties period along with its frequency change.
CONSTITUTION: The sequential reading is given to the manuscript based on clock signal ϕ2 supplied via AND gates 22 and 23 through free-running scanning element 21 for reading of the manuscript. The signals read out are applied to amplifier 25 possessing the blind sector to set up the DC component of output V3. Then output V3 is applied to voltage control oscillator 26 to draw out signal F produced by converting the voltage change of signal V3 into the frequency change. This signal F containing the shading properties is stored in shift register 29 and then read out by the clock of gate 22 to be led out to LPF31 via monostable multivibrator 30. The output of LPF31 is applied to differential amplifier 35 which supplies the picture signals corresponding to each line of element 21 via switching element 32 drawing out the signal corresponding to the shading period. Thus the shading can be corrected.
COPYRIGHT: (C)1980,JPO&Japio
JP11385778A 1978-09-13 1978-09-13 Shading distortion correction circuit for facsimile equipment Pending JPS5539484A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11385778A JPS5539484A (en) 1978-09-13 1978-09-13 Shading distortion correction circuit for facsimile equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11385778A JPS5539484A (en) 1978-09-13 1978-09-13 Shading distortion correction circuit for facsimile equipment

Publications (1)

Publication Number Publication Date
JPS5539484A true JPS5539484A (en) 1980-03-19

Family

ID=14622807

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11385778A Pending JPS5539484A (en) 1978-09-13 1978-09-13 Shading distortion correction circuit for facsimile equipment

Country Status (1)

Country Link
JP (1) JPS5539484A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5972270A (en) * 1982-10-18 1984-04-24 Toray Ind Inc Picture reading method
US4589034A (en) * 1980-12-05 1986-05-13 Canon Kabushiki Kaisha Image processing apparatus
US11668208B2 (en) 2018-08-17 2023-06-06 Mitsubishi Heavy Industries, Ltd. Positioning method of arc-like member and positioning jig

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589034A (en) * 1980-12-05 1986-05-13 Canon Kabushiki Kaisha Image processing apparatus
JPS5972270A (en) * 1982-10-18 1984-04-24 Toray Ind Inc Picture reading method
US11668208B2 (en) 2018-08-17 2023-06-06 Mitsubishi Heavy Industries, Ltd. Positioning method of arc-like member and positioning jig

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