JPS6454577A - Illumination controller - Google Patents
Illumination controllerInfo
- Publication number
- JPS6454577A JPS6454577A JP62211597A JP21159787A JPS6454577A JP S6454577 A JPS6454577 A JP S6454577A JP 62211597 A JP62211597 A JP 62211597A JP 21159787 A JP21159787 A JP 21159787A JP S6454577 A JPS6454577 A JP S6454577A
- Authority
- JP
- Japan
- Prior art keywords
- illuminating
- image pickup
- power
- image obtained
- multilevel
- 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 quickly and automatically set the illuminating condition, by calculating an optimum threshold level by binarizing an image obtained by an image pickup means, and controlling the illuminating power so that said value is positioned in the vicinity of the center of a dynamic range of brightness. CONSTITUTION:An image pickup device 2 obtains a multilevel image by bringing an image pickup object 5 to image pickup under the illumination by an illuminator 1, and sends out its video signal to a microcomputer 3. The computer 3 processes the multilevel image obtained by the device 2, calculates a target value of the illuminating power and gives it to a power control unit 4. In this case, the computer 3 calculates the target value of the illuminating power so that an optimum binarization threshold level for binarizing the multilevel image obtained by the device 2 is positioned in the vicinity of the center of a dynamic range of brightness. The unit 4 modulates the illuminating light by PWM (pulse width modulation), PNM (pulse number modulation), PAM (pulse amplitude modulation), AM (amplitude modulation), etc., in order to control said illuminating power.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62211597A JPS6454577A (en) | 1987-08-26 | 1987-08-26 | Illumination controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62211597A JPS6454577A (en) | 1987-08-26 | 1987-08-26 | Illumination controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6454577A true JPS6454577A (en) | 1989-03-02 |
Family
ID=16608397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62211597A Pending JPS6454577A (en) | 1987-08-26 | 1987-08-26 | Illumination controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6454577A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7535948B2 (en) | 2001-09-13 | 2009-05-19 | Cymer, Inc. | Cathodes for fluorine gas discharge lasers |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57172462A (en) * | 1981-04-15 | 1982-10-23 | Mitsubishi Electric Corp | Picture input device |
-
1987
- 1987-08-26 JP JP62211597A patent/JPS6454577A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57172462A (en) * | 1981-04-15 | 1982-10-23 | Mitsubishi Electric Corp | Picture input device |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7535948B2 (en) | 2001-09-13 | 2009-05-19 | Cymer, Inc. | Cathodes for fluorine gas discharge lasers |
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