JPS5649944A - Method and device for detecting defect of moving sheetlike article - Google Patents
Method and device for detecting defect of moving sheetlike articleInfo
- Publication number
- JPS5649944A JPS5649944A JP12657879A JP12657879A JPS5649944A JP S5649944 A JPS5649944 A JP S5649944A JP 12657879 A JP12657879 A JP 12657879A JP 12657879 A JP12657879 A JP 12657879A JP S5649944 A JPS5649944 A JP S5649944A
- Authority
- JP
- Japan
- Prior art keywords
- memory
- defect
- moving
- signal
- transduced
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
Abstract
PURPOSE:To make S/N of a defect signal excellent by a method wherein a digitalized image in the same place, which appears in different positions at every one frame in synchronization with the velocity of a moving article, is integrated on the same memory and housed therein. CONSTITUTION:The sheetlike article 1 to be detected moving at a fixed velocity is picked up by a television camera 2. An analog video signal from the camera 2 is inputted in an A/D converter 4 through a synchronizing separator 3 and is transduced into a digital video signal. After being transduced into digital values, digital signals for several frames are shifted by the distance of moving during one frame period and integrated and then is stored in the memory block in a memory 9. A block out of the memory blocks of the memory 9, for which addition is performed at prescribed number of rotation, is read in by a defect-detecting signal output device 10 through a memory selector 8, subjected to the threshold-value processing and, when any defect is detected, a detection pluse 13 is outputted. In this way, the S/N of a defect signal can be made excellent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12657879A JPS5649944A (en) | 1979-10-01 | 1979-10-01 | Method and device for detecting defect of moving sheetlike article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12657879A JPS5649944A (en) | 1979-10-01 | 1979-10-01 | Method and device for detecting defect of moving sheetlike article |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5649944A true JPS5649944A (en) | 1981-05-06 |
Family
ID=14938630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12657879A Pending JPS5649944A (en) | 1979-10-01 | 1979-10-01 | Method and device for detecting defect of moving sheetlike article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5649944A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995031066A1 (en) * | 1994-05-10 | 1995-11-16 | Mannesmann Ag | Process and device for reducing blurring due to movement and image interference in images of moving objects |
| JP2017138276A (en) * | 2016-02-05 | 2017-08-10 | 西日本高速道路エンジニアリング関西株式会社 | Road surface imaging system |
-
1979
- 1979-10-01 JP JP12657879A patent/JPS5649944A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995031066A1 (en) * | 1994-05-10 | 1995-11-16 | Mannesmann Ag | Process and device for reducing blurring due to movement and image interference in images of moving objects |
| JP2017138276A (en) * | 2016-02-05 | 2017-08-10 | 西日本高速道路エンジニアリング関西株式会社 | Road surface imaging system |
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