JPS54144807A - Memory unit for shading amount - Google Patents
Memory unit for shading amountInfo
- Publication number
- JPS54144807A JPS54144807A JP5302778A JP5302778A JPS54144807A JP S54144807 A JPS54144807 A JP S54144807A JP 5302778 A JP5302778 A JP 5302778A JP 5302778 A JP5302778 A JP 5302778A JP S54144807 A JPS54144807 A JP S54144807A
- Authority
- JP
- Japan
- Prior art keywords
- scanning period
- memorizing
- picture
- converter
- picture signal
- 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
- 238000003705 background correction Methods 0.000 abstract 1
- 238000005070 sampling Methods 0.000 abstract 1
Landscapes
- Picture Signal Circuits (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE: To perform suitable shading correction without using the A/D converter of high speed, by memorizing all the information corresponding to all the picture element for one scanning period, in the reader reading in original through the use of solidstate memory elements.
CONSTITUTION: In the unit providing the memory circuit 5 memorizing the information corresponding to each picture element in one horizontal scanning period of the picture signal from the solidstate pick up element to respective address, sample hold circuit S/H2 sample-holding the content of picture signal every picture element, and A/D converter 3 converting the output from the circuit 2 into the digital signal, and memorizing the amount of shading of light source and pick up objective, the same part of the picked up objective is repetitively horizontal-scanned in a plurality of numbers and control is made with the control circuit CC so that the same picture signal is obtained during horizontal scanning period. The content of information of the picture element in the picture signal corresponding to the horizontal scanning period with this constitution is sampled with the sampling pulse having the period longer than the time width required for the operation of the converter 3, in advance.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5302778A JPS54144807A (en) | 1978-05-03 | 1978-05-03 | Memory unit for shading amount |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5302778A JPS54144807A (en) | 1978-05-03 | 1978-05-03 | Memory unit for shading amount |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54144807A true JPS54144807A (en) | 1979-11-12 |
Family
ID=12931399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5302778A Pending JPS54144807A (en) | 1978-05-03 | 1978-05-03 | Memory unit for shading amount |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54144807A (en) |
-
1978
- 1978-05-03 JP JP5302778A patent/JPS54144807A/en active Pending
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