EP2297568A1 - Method for detecting moving objects - Google Patents
Method for detecting moving objectsInfo
- Publication number
- EP2297568A1 EP2297568A1 EP09779890A EP09779890A EP2297568A1 EP 2297568 A1 EP2297568 A1 EP 2297568A1 EP 09779890 A EP09779890 A EP 09779890A EP 09779890 A EP09779890 A EP 09779890A EP 2297568 A1 EP2297568 A1 EP 2297568A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- camera
- image
- line
- cameras
- objects
- 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.)
- Withdrawn
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
- G01N21/8901—Optical details; Scanning details
- G01N21/8903—Optical details; Scanning details using a multiple detector array
-
- 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
- G01N2021/845—Objects on a conveyor
-
- 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
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8854—Grading and classifying of flaws
- G01N2021/8867—Grading and classifying of flaws using sequentially two or more inspection runs, e.g. coarse and fine, or detecting then analysing
Definitions
- the invention relates to the taking of object images, wherein moving objects move relative to the camera in an object space, which is received by the camera.
- the image recording is to be taken at the appropriate time. If the image acquisition is started too late, the object to be recorded is already partially or completely outside the image field or the object space. Normally, a sensor, such as a light barrier, is used to trigger the camera in such a way that timely image acquisition takes place. However, cases are conceivable in which triggering with an external sensor is no longer possible. This is the case, for example, with strongly fluctuating movement of objects. It is aggravating that, if it concerns the objects to be imaged Sub-objects of a larger object is, for example, the optical inspection of semiconductor chips on wafers, different magnifications are required.
- a photoelectric sensor has been used with an external sensor to trigger the system.
- the invention is based on the object of describing the imaging of moving objects by means of a stationary camera system, wherein irregular or fast object movements are to be controlled with regard to image acquisition.
- the invention is based on the finding that for the object image used, one-dimensional resolution two cameras are arranged offset in a measuring head relative to an optical axis about 90 ° from each other, that the respective image of these cameras or camera optics on the object in the direction of movement Object is aligned longitudinally aligned.
- this camera system is used to determine the image distortion, for example due to uneven movement of the objects.
- the object shift in the consecutively captured images is analyzed and used for the image correction.
- the second camera is generally used to capture the object image, i. H. that the test object is scanned line by line by the second camera, followed by any intermediate storage and assignment of the individual image lines to a two-dimensional image.
- Another solution to the same problem is based on the combination of two camera systems in a single measuring head, wherein the one-dimensionally imaging camera constantly picks up the object surface and only when a suitable Abbr. education profile, the two-dimensional resolution camera triggers a synchronization circuit.
- the two cameras used relative to the optical axis offset by about 90 ° to each other.
- the first camera is also aligned here so that their image is formed on the object approximately parallel to the direction of movement. If an object is detected by recording a corresponding line profile, whereby the type of object is detected, the second camera is activated after a predetermined delay time.
- the individual cameras can advantageously be line scan cameras with associated optics and illumination.
- both cameras used one-dimensional resolution, they can be triggered against each other at certain times.
- the triggering is advantageously done via a synchronization circuit.
- FIG. 1A shows a system for object detection with a first one-dimensionally resolving camera K1 having its image F1 and a second two-dimensionally resolving camera K3 having the image F3 on an object,
- FIG. 1B shows a representation correspondingly
- FIG. 1A wherein both cameras used are one-dimensionally resolving types and their images each represent a row Z1, Z2 on an object
- FIGS. 2A and 2B show the form of object scanning associated with FIGS. 1A and 1B;
- FIGS. 3A and 3B show, with reference to FIGS. 2A and 2B, a variant with a synchronization and an image evaluation, the synchronization in each case relating to the two cameras used, based on the results of FIGS. 3A and 3B
- Image evaluation of the line Zl is triggered.
- a measuring system and a method for detecting moving objects are each associated with at least two one-dimensional imaging cameras, which may be either line scan cameras K1 and K2, or a line camera and a two-dimensionally resolving camera.
- the line scan cameras K1, K2 can have different numbers of pixel elements. At the same time, the magnification of each camera may differ from that of other cameras.
- the recording cameras Kl and K2 are triggered at certain times.
- a special case of the triggering is the simultaneous triggering of the image acquisition of both cameras.
- the line scan camera Kl is also used in connection with a synchronization circuit for triggering the second camera K2, K3.
- the magnification used for the camera Kl is used.
- the most favorable trigger time for activating the second camera K2, K3 can be derived by appropriate pixel evaluation and the triggering can be started accordingly.
- the first camera Kl is a line scan camera which is connected to a picture capture of several lines.
- the additional image parts are used to determine the position of the object or the test object.
- the method described is particularly suitable for imaging along an optical axis with moving objects at an undefined speed, wherein different corrections in the image recording are possible, whereby the quality of the optical inspection is improved.
- in particular measuring devices can be integrated more easily and thus cost-savingly into a production line.
- a one-dimensionally resolving and a two-dimensionally resolving camera can also be used for the combination.
- the one-dimensionally resolving camera K1 is constantly functioning on the object surface and only when a suitable imaging profile of an object 1, 2 the second two-dimensionally resolving camera K3 is triggered via a synchronization circuit.
- the described method uses at least one one-dimensionally resolving camera K1 and a two-dimensionally resolving camera K3.
- a line scan camera with several lines can be used, with which a plurality of image lines is scanned simultaneously.
- the additional information is used to improve object recognition.
- the image analysis is done by means of an image processing hardware and corresponding analysis software.
- the triggering of the two-dimensionally resolving camera K3 takes place when a suitable line profile, which describes the object to be recorded, is recorded with the one-dimensionally imaging camera K1. After the finding of this predefined suitable profile of a test object, a defined delay time will elapse before the image acquisition is started with the two-dimensionally resolving camera K3.
- the image field of both cameras overlaps in such a way that at least one image element imaged by camera Kl lies on the image imaged by camera K2, K3.
- the optical reproduction scales for both cameras Kl and K2 and also K3 can be different.
- the camera K1 consists of a line scan camera which scans at least one line at a time and if necessary consists of an optical system Ol and a lighting BR.
- the camera K2 consists of a two-dimensional resolution camera, a two-dimensional imaging optics and illumination B.
- the cameras Kl and K2 or K3 have common optical elements for imaging the object, ie, they overlap at least one pixel on the object surface.
- FIGS. 1A, 2A and 3A show the solution variant with a one-dimensionally resolving camera K1, corresponding to the line Z1 and combined with the two-dimensionally resolving camera K3, which corresponds to the surface F3.
- the cameras Kl, K3 are arranged rotated by approximately 90 °.
- Each camera is assigned a camera optics oil, 02.
- a common optic 012 with an illumination B is provided in the central beam path.
- the line Zl is aligned according to the direction of movement BR, d. H. parallel to this.
- the line Z1 corresponds to the image of the line camera K1 on the object.
- the line Z1 and the surface F3 overlap at least in one pixel.
- FIGS. 3A and 3B show the solution variant with two one-dimensional resolution cameras Kl, K2.
- the system components are essentially the same.
- the lines Z1 and Z2 overlap at least in one pixel.
- FIG. 2B an object scan is indicated, wherein Z1 and Z2 can touch and overlap in one pixel or have an overlap in a larger number of pixels.
- FIGS. 3A and 3B contain a synchronization and an image evaluation for the variant with a two-dimensionally resolving camera K3.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008033132 | 2008-07-15 | ||
PCT/EP2009/057810 WO2010006894A1 (en) | 2008-07-15 | 2009-06-23 | Method for detecting moving objects |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2297568A1 true EP2297568A1 (en) | 2011-03-23 |
Family
ID=41008877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09779890A Withdrawn EP2297568A1 (en) | 2008-07-15 | 2009-06-23 | Method for detecting moving objects |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2297568A1 (en) |
WO (1) | WO2010006894A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0068731B1 (en) * | 1981-06-19 | 1985-08-21 | European Electronic Systems Limited | Crop shear control |
DE3125476C2 (en) | 1981-06-29 | 1986-11-06 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Control device for a pair of scissors for cutting off rolled material ends which are incomplete with regard to their width |
US4794647A (en) * | 1985-04-08 | 1988-12-27 | Northern Telecom Limited | Automatic optical inspection system |
-
2009
- 2009-06-23 EP EP09779890A patent/EP2297568A1/en not_active Withdrawn
- 2009-06-23 WO PCT/EP2009/057810 patent/WO2010006894A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2010006894A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010006894A1 (en) | 2010-01-21 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20101214 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR |
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AX | Request for extension of the european patent |
Extension state: AL BA RS |
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DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS AKTIENGESELLSCHAFT |
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17Q | First examination report despatched |
Effective date: 20140806 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20141217 |