JPS5587282A - Picture binary-coding system - Google Patents
Picture binary-coding systemInfo
- Publication number
- JPS5587282A JPS5587282A JP16039078A JP16039078A JPS5587282A JP S5587282 A JPS5587282 A JP S5587282A JP 16039078 A JP16039078 A JP 16039078A JP 16039078 A JP16039078 A JP 16039078A JP S5587282 A JPS5587282 A JP S5587282A
- Authority
- JP
- Japan
- Prior art keywords
- level
- shade
- valley
- maximum
- minimum
- 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
- Image Input (AREA)
Abstract
PURPOSE: To determine the binary-coding threshold value of a picture by simple hardware constitution by using the maximum and minimum values of the shade level of the picture and its shade histogram by paying attention to characteristics of the picture, i.e. a linear pattern.
CONSTITUTION: A multi-level video signal from a mesh point on an objective screen is inputted to decoder 1, which selects one output line to output logic "1". After video signals from all mesh points are inputted to decoder 1, the histogram of the shade level of the objective screen is formed in counter 1 or (n). From the histogram of respective shade levels, maximum-level detection circuit 3, minimum-level detection circuit 4 and valley-level detection circuit 5 detect maximum level Lmax, minimum level Lmin and valley level Lb respectively. On the basis of respective levels, a binary coding threshold value is determined and when the valley level is close to the mean value between the maximum and minimum levels, the binary coding threshold level is considered to be the valley level.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16039078A JPS5587282A (en) | 1978-12-25 | 1978-12-25 | Picture binary-coding system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16039078A JPS5587282A (en) | 1978-12-25 | 1978-12-25 | Picture binary-coding system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5587282A true JPS5587282A (en) | 1980-07-01 |
Family
ID=15713916
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16039078A Pending JPS5587282A (en) | 1978-12-25 | 1978-12-25 | Picture binary-coding system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5587282A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58211272A (en) * | 1982-06-02 | 1983-12-08 | Hitachi Ltd | Threshold level deciding method |
JPS5990175A (en) * | 1982-11-15 | 1984-05-24 | Toshiba Corp | Binary coding circuit |
-
1978
- 1978-12-25 JP JP16039078A patent/JPS5587282A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58211272A (en) * | 1982-06-02 | 1983-12-08 | Hitachi Ltd | Threshold level deciding method |
JPH0418347B2 (en) * | 1982-06-02 | 1992-03-27 | Hitachi Ltd | |
JPS5990175A (en) * | 1982-11-15 | 1984-05-24 | Toshiba Corp | Binary coding circuit |
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