JPS56111373A - Picture scanning method - Google Patents
Picture scanning methodInfo
- Publication number
- JPS56111373A JPS56111373A JP1435780A JP1435780A JPS56111373A JP S56111373 A JPS56111373 A JP S56111373A JP 1435780 A JP1435780 A JP 1435780A JP 1435780 A JP1435780 A JP 1435780A JP S56111373 A JPS56111373 A JP S56111373A
- Authority
- JP
- Japan
- Prior art keywords
- original
- variable density
- gradation
- dither matrix
- scanning element
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Scanning Arrangements (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE:To prevent deterioration of the gradation representability, which is caused by variable density of an original, by detecting a variable density level of the original by other detection element at the same time when the original is scanned by the solid scanning element, and setting a threshold level of dither matrix. CONSTITUTION:An original 1 is scanned by the solid scanning element 4, and a gradation signal is output by the dither matrix. At the same time when said scanning is executed, variable density of the original is detected by the photodetector 5 which has been installed in front of the solid scanning element 4 in the subscanning direction D2. This detection output S is made a reference level of the dither. In this way, a threshold level of the dither matrix is set in accordance with variable density of the original, and the gradation representability is not deteriorated even when variable density of an original has been changed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1435780A JPS56111373A (en) | 1980-02-08 | 1980-02-08 | Picture scanning method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1435780A JPS56111373A (en) | 1980-02-08 | 1980-02-08 | Picture scanning method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56111373A true JPS56111373A (en) | 1981-09-03 |
Family
ID=11858812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1435780A Pending JPS56111373A (en) | 1980-02-08 | 1980-02-08 | Picture scanning method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56111373A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4605105A (en) * | 1982-09-03 | 1986-08-12 | Akebono Brake Industry Co., Ltd. | Brake system |
-
1980
- 1980-02-08 JP JP1435780A patent/JPS56111373A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4605105A (en) * | 1982-09-03 | 1986-08-12 | Akebono Brake Industry Co., Ltd. | Brake system |
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