JPS5539484A - Shading distortion correction circuit for facsimile equipment - Google Patents
Shading distortion correction circuit for facsimile equipmentInfo
- 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
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
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)
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 |
-
1978
- 1978-09-13 JP JP11385778A patent/JPS5539484A/en active Pending
Cited By (3)
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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