DE4206868A1 - Photographing moving objects with video camera - provides scanning mirror in beam path between object and camera with deflection such that movement of object image is compensated - Google Patents
Photographing moving objects with video camera - provides scanning mirror in beam path between object and camera with deflection such that movement of object image is compensatedInfo
- Publication number
- DE4206868A1 DE4206868A1 DE19924206868 DE4206868A DE4206868A1 DE 4206868 A1 DE4206868 A1 DE 4206868A1 DE 19924206868 DE19924206868 DE 19924206868 DE 4206868 A DE4206868 A DE 4206868A DE 4206868 A1 DE4206868 A1 DE 4206868A1
- Authority
- DE
- Germany
- Prior art keywords
- camera
- moving objects
- deflection
- rotating
- oscillating
- 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- Withdrawn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
-
- 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N2021/1789—Time resolved
- G01N2021/1791—Time resolved stroboscopic; pulse gated; time range gated
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Aufnahme von Objekten, die sich mit näherungsweise bekannter Geschwindigkeit bewegen, mittels einer Kamera, insbesondere einer Videokamera.The invention relates to a method and a device to capture objects that deal with approximately known speed, using a camera, especially a video camera.
Die Integrationszeit handelsüblicher Videokameras entspricht einem Vollbild (40 ms bei europäischer Norm) oder einem Halbbild (20 ms). Dadurch ergibt sich bei der Aufnahme von bewegten Objekten eine Bewegungsunschärfe. Auch bei anderen Kameratypen muß man bei bewegten Objekten bekannter maßen mit einer Bewegungsunschärfe entsprechend der Belichtungszeit rechnen.The integration time of commercially available video cameras corresponds a full screen (40 ms for European standard) or one Field (20 ms). This results in the recording motion blur of moving objects. Also at other types of cameras have to be known for moving objects measured with a motion blur corresponding to the Calculate exposure time.
Zur Verringerung der Bewegungsunschärfe bei der Aufnahme von bewegten Objekten mit Videokameras sind zwei Methoden geläufig:To reduce motion blur when shooting Moving objects with video cameras are two methods common:
- 1. Verwendung einer Blitzbeleuchtung.1. Using flash lighting.
- 2. Verwendung einer sog. Shutterkamera (kurze Integrations zeit, z. B. 0,1 ms).2. Use of a so-called shutter camera (short integration time, e.g. 0.1 ms).
Bei beiden Methoden ist insbesondere wegen der kurzen Be leuchtungs- bzw. Integrationszeit kurzzeitig eine hohe Beleuchtungsenergie erforderlich, was in jedem Falle zu einem erhöhten technischen Aufwand führt. U.a. ergeben sich daraus Probleme bei der Konstruktion homogener Be leuchtungen; für Aufnahmen bei schwachem, natürlichem Licht reicht oft die zur Verfügung stehende Lichtenergie nicht aus.In both methods, especially because of the short loading lighting or integration time a short time high lighting energy required, which in any case leads to increased technical effort. Among other things surrender problems with the construction of homogeneous loading lights; for shooting in low, natural light Often the available light energy is not enough out.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung anzugeben, mit denen unter Verwendung von handelsüblichen Kameras, die mit voller oder nur geringfügig reduzierter Integrationszeit betrieben werden, bewegte Objekte näherungsweise bekannter Geschwindigkeit bei kontinuierlicher Beleuchtung ohne Bewegungsunschärfe aufzunehmen. The invention has for its object a method and to provide a device with which using commercially available cameras with full or marginal reduced integration time are operated, moved Objects of approximately known speed continuous lighting without motion blur to record.
Erfindungsgemäß wird die genannte Aufgabe dadurch gelöst, daß sich im Strahlengang zwischen Objekt und Kamera ein Mittel befindet, mit dem der Strahlengang periodisch abgelenkt wird. Die Ablenkfrequenz ist bei Videokameras an die Bildwechsel frequenz angepaßt und die Ablenkamplitude wird so eingestellt, daß sich auf der lichtempfindlichen Schicht (Target) der Kamera zumindest zeitweise ein stehendes Bild des bewegten Objekts ergibt. Dies ist dann der Fall, wenn der zeitliche Verlauf der Ablenkung so geschieht, daß die Ablenkung zumindest zeitweise die Bewegung der Abbildung des Objekts auf dem Target kompensiert.According to the invention, the stated object is achieved in that means in the beam path between the object and the camera with which the beam path is periodically deflected. The deflection frequency is in video cameras at the image changes frequency adjusted and the deflection amplitude is set so that on the photosensitive layer (target) Camera at least temporarily a still picture of the moving Object results. This is the case when the time Course of the distraction happens so that the distraction at least temporarily the movement of the image of the object on the target compensated.
Gemäß einer bevorzugten Ausgestaltung ist als ablenkendes Mittel vorgesehen:According to a preferred embodiment is as a distracting Means provided:
- - ein oszillierender oder rotierender oder sonst periodisch bewegter Ablenkspiegel oder- an oscillating or rotating or otherwise periodic moving deflecting mirror or
- - eine oszillierende oder rotierende oder sonst periodisch bewegte planparallele, transparente Platte.- an oscillating or rotating or otherwise periodic moving plane-parallel, transparent plate.
In beiden Fällen entspricht bei Verwendung von Videokameras in bevorzugter Ausgestaltung die Ablenkfrequenz der Vollbild- oder Halbbildfrequenz oder einem ganzzahligen Teil oder einem ganzzahligen Vielfachen davon. Dann ergibt sich auf dem Target eine Folge von scharfen Bildern mit äquidistanter Verschiebung des Objekts von Bild zu Bild - mit den daraus folgenden Vorteilen u. a. für eine automatische Analyse der Bilder.Corresponds in both cases when using video cameras in a preferred embodiment, the deflection frequency of the full-frame or field frequency or an integer part or one integer multiples of it. Then it results on the target a series of sharp images with equidistant shift of the object from picture to picture - with the resulting ones Advantages and a. for an automatic analysis of the images.
In einer Ausgestaltung wird die Ablenkamplitude dadurch justiert, daß die Position des ablenkenden Mittels in Rich tung des Strahlengangs verstellt werden kann.In one embodiment, the deflection amplitude is thereby adjusts the position of the distracting agent in Rich direction of the beam path can be adjusted.
Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den Ansprüchen und der nachfolgenden Beschreibung, in der zwei Ausführungsbeispiele der Erfindung unter Bezug nahme auf die Zeichnung im einzelnen erläutert sind. Dabei zeigt:Further advantages and features of the invention result from the claims and the description below, in the two embodiments of the invention with reference take on the drawing are explained in detail. Here shows:
Fig. 1 eine Ausführungsform mit oszillierendem oder rotie rendem Spiegel, und Fig. 1 shows an embodiment with an oscillating or rotating mirror, and
Fig. 2 eine Ausführungsform mit Drehwürfel als Beispiel einer rotierenden planparallelen Platte. Fig. 2 shows an embodiment with a rotating cube as an example of a rotating plane-parallel plate.
Die Anordnung nach Fig. 1 ist vorteilhaft bei relativ zur Bildfeldgröße im Zeitraum des Bildaufnahmetakts schnell be wegten Objekten. Die Anordnung nach Fig. 2 führt zu gerin gerer Ablenkung und ist daher bei relativ zur Bildfeldgröße im Zeitraum des Bildaufnahmetakts langsam bewegten Objekten dadurch von Vorteil, daß die technisch sehr einfach zu realisierende rotatorische Bewegung eingesetzt werden kann. The arrangement according to FIG. 1 is advantageous for objects that move quickly relative to the image field size in the period of the image recording clock. The arrangement according to FIG. 2 leads to less deflection and is therefore advantageous in the case of objects that move slowly relative to the image field size in the period of the image recording cycle in that the rotational movement, which is technically very easy to implement, can be used.
Das sich kontinuierlich bewegende Objekt 1, z. B. eine zu untersuchende Stoffbahn, wird über eine Videokamera 2 aufgenommen. Im Strahlengang befindet sich ein ablenkendes Mittel, in Fig. 1 der Drehspiegel 3, in Fig. 2 der transpa rente Drehwürfel 4. Die ablenkenden Mittel werden in der angegebenen Richtung rotatorisch bewegt. Bei geeignet bemessener Ablenkgeschwindigkeit ergibt sich auf dem Target der Kamera zeitweise ein stehendes Bild. Die ablenkenden Mittel können in Richtung der Doppelpfeile verstellt werden; dadurch kann eine Feinanpassung der Ablenkungsamplitude auf dem Target erreicht werden.The continuously moving object 1 , e.g. B. a fabric to be examined is recorded via a video camera 2 . A deflecting means is located in the beam path, in FIG. 1 the rotating mirror 3 , in FIG. 2 the transparent rotating cube 4 . The deflecting means are rotated in the direction indicated. If the deflection speed is suitably measured, a still image is temporarily obtained on the target of the camera. The deflecting means can be adjusted in the direction of the double arrows; this enables a fine adjustment of the deflection amplitude on the target.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19924206868 DE4206868A1 (en) | 1992-03-05 | 1992-03-05 | Photographing moving objects with video camera - provides scanning mirror in beam path between object and camera with deflection such that movement of object image is compensated |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19924206868 DE4206868A1 (en) | 1992-03-05 | 1992-03-05 | Photographing moving objects with video camera - provides scanning mirror in beam path between object and camera with deflection such that movement of object image is compensated |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4206868A1 true DE4206868A1 (en) | 1993-09-09 |
Family
ID=6453240
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19924206868 Withdrawn DE4206868A1 (en) | 1992-03-05 | 1992-03-05 | Photographing moving objects with video camera - provides scanning mirror in beam path between object and camera with deflection such that movement of object image is compensated |
Country Status (1)
Country | Link |
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DE (1) | DE4206868A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0759483A1 (en) * | 1995-08-18 | 1997-02-26 | Hubert Dipl. Ing.-Dipl. Wirt. Ing. Hergeth | Method for detecting foreign fibers in an opening machine |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54160229A (en) * | 1978-06-07 | 1979-12-18 | Matsushita Electric Ind Co Ltd | Shutter device |
DE2136899B2 (en) * | 1970-07-30 | 1980-04-17 | Bolex International S.A., Sainte- Croix, Waadt (Schweiz) | Device for recording or playing back cinematographic images while the film is moving |
US4199232A (en) * | 1976-06-25 | 1980-04-22 | Olodort Robert A | Optical rectification apparatus |
DE2937024A1 (en) * | 1979-09-13 | 1981-04-02 | Ottmar-Paul 6200 Wiesbaden Haberkern | Cine gate for continuous film movement - has reciprocating mirrors and shutters to synchronise with film drive |
DE3334147A1 (en) * | 1982-09-21 | 1984-04-26 | British Aerospace Plc, London | Method and device for correcting a video signal |
DE3705042A1 (en) * | 1986-02-28 | 1987-09-03 | Ferranti Plc | OPTICAL SCANNER |
DE3712513A1 (en) * | 1987-04-13 | 1988-11-03 | Roth Electric Gmbh | METHOD AND DEVICE FOR DETECTING SURFACE DEFECTS |
US5041852A (en) * | 1990-10-18 | 1991-08-20 | Fjui Photo Film Co., Ltd. | Camera shake correction system |
-
1992
- 1992-03-05 DE DE19924206868 patent/DE4206868A1/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2136899B2 (en) * | 1970-07-30 | 1980-04-17 | Bolex International S.A., Sainte- Croix, Waadt (Schweiz) | Device for recording or playing back cinematographic images while the film is moving |
US4199232A (en) * | 1976-06-25 | 1980-04-22 | Olodort Robert A | Optical rectification apparatus |
JPS54160229A (en) * | 1978-06-07 | 1979-12-18 | Matsushita Electric Ind Co Ltd | Shutter device |
DE2937024A1 (en) * | 1979-09-13 | 1981-04-02 | Ottmar-Paul 6200 Wiesbaden Haberkern | Cine gate for continuous film movement - has reciprocating mirrors and shutters to synchronise with film drive |
DE3334147A1 (en) * | 1982-09-21 | 1984-04-26 | British Aerospace Plc, London | Method and device for correcting a video signal |
DE3705042A1 (en) * | 1986-02-28 | 1987-09-03 | Ferranti Plc | OPTICAL SCANNER |
DE3712513A1 (en) * | 1987-04-13 | 1988-11-03 | Roth Electric Gmbh | METHOD AND DEVICE FOR DETECTING SURFACE DEFECTS |
US5041852A (en) * | 1990-10-18 | 1991-08-20 | Fjui Photo Film Co., Ltd. | Camera shake correction system |
Non-Patent Citations (1)
Title |
---|
Bild und Ton, H.7, 20.Jg., 1967, S.195-199 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0759483A1 (en) * | 1995-08-18 | 1997-02-26 | Hubert Dipl. Ing.-Dipl. Wirt. Ing. Hergeth | Method for detecting foreign fibers in an opening machine |
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OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8139 | Disposal/non-payment of the annual fee |