WO1997015810A1 - Colour recording system - Google Patents

Colour recording system Download PDF

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Publication number
WO1997015810A1
WO1997015810A1 PCT/EP1996/003860 EP9603860W WO9715810A1 WO 1997015810 A1 WO1997015810 A1 WO 1997015810A1 EP 9603860 W EP9603860 W EP 9603860W WO 9715810 A1 WO9715810 A1 WO 9715810A1
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WO
WIPO (PCT)
Prior art keywords
recording system
fabry
plates
color recording
color
Prior art date
Application number
PCT/EP1996/003860
Other languages
German (de)
French (fr)
Inventor
Jürgen Wagner
Hans Bloss
Norbert Bauer
Friedrich G. BÖBEL
Original Assignee
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE19623280A external-priority patent/DE19623280A1/en
Application filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Publication of WO1997015810A1 publication Critical patent/WO1997015810A1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/28—Interference filters
    • G02B5/284—Interference filters of etalon type comprising a resonant cavity other than a thin solid film, e.g. gas, air, solid plates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/03—Circuitry for demodulating colour component signals modulated spatially by colour striped filters by frequency separation

Definitions

  • the present invention relates to a color recording system that uses a variable, optical filter based on a Fabry-Perot interferometer.
  • optical filters are used to produce color separations for CCD cameras or other image recording systems.
  • the state of the art must be viewed from two sides.
  • One starting point is the color recording technology.
  • the most widespread method uses the division of the object image into three images by means of partially transparent optical components. Using color filters, usually so-called R-G-B filters, three color separations are created, which are then fed to three image pickup systems.
  • the disadvantage of this method is that the division of the total intensity into three partial beams leads to an intensity loss.
  • three image pickup systems are required, which results in high costs for high quality image pickup systems. Trying to record the three color separations on an image pickup system reduces the costs, but has the disadvantage of a low spatial resolution.
  • a Fabry-Perot interferometer (A. Fabry and Ch. Perot 1897) consists of two plane-parallel, partially mirrored plates with a gap in the middle. The partially mirrored surfaces of the plates face each other.
  • the Fabry-Perot interferometer is based on the principle of multi-beam interference. For the ratio of emerging intensity (I aU s) to occur With a Fabry-Perot interferometer, the following relationship is obtained:
  • ⁇ Wavelength of the radiation under consideration
  • Tunable Fabry-Perot interferometers have been developed to enable access to larger wavelength ranges.
  • the alternative to this is the mechanical adjustment of the distance between the plane-parallel plates. Piezo elements are mostly used to achieve this adjustment with the necessary accuracy.
  • the present invention is based on the object of creating a color recording system which enables the production of color separations with little material expenditure, high spatial resolution and high speed.
  • the present invention provides a color recording system with a single image recording system and an optical filter which can be adjusted with regard to the wavelength of the light impinging on the image recording system, and which is designed as a Fibry-Perot interferometer.
  • FIG. 1 shows a sectional illustration of a Fabry-Perot interferometer as used in the present invention.
  • Fig. 2 shows the transmission characteristics of the filter as a function of the wavelength at a predetermined setting.
  • FIG. 1 shows an optical filter, which is designed as a Fabry-Perot interferometer, as is shown in the color recording system according to the invention is used.
  • the filter according to FIG. 1 is provided with the reference number 100 in its entirety.
  • the filter includes a holder structure 102 that supports a first plate 104.
  • a second plate 106 is held by a plurality of piezoelectric elements 108 in such a way that the first plate 104 and the second plate 106 are aligned at a distance from one another in a plane-parallel arrangement.
  • a space 110 is formed between the first plate 104 and the second plate 106.
  • the second plate is connected to the Haiter structure 102 via a spring device 112.
  • the first plate 106 comprises a first surface 114 which faces a first surface 116 of the second plate 106.
  • the surfaces 114 and 116 are partially mirrored surfaces.
  • the holder structure is designed in such a way that the plate 106 is held by the holder structure 102 only at its end regions 118.
  • the Haiter structure 102 does not extend over the area of the plate 1 which lies between the end areas 118, as a result of which a recess 120 is formed in the Haiter structure 102 in which the plane-parallel plates 104 and 106 are received.
  • an essentially U-shaped holder structure 102 is shown in FIG. 1, it is obvious that other holder structures can be used.
  • one end of the recess 120 which is arranged adjacent to the second plate, is provided with a filter 122.
  • the plates 104 and 106 shown in FIG. 1 can have any suitable shape. According to a preferred embodiment, the plates are circular, in which case the holder 102 is also circular. With the aid of the variable optical filter shown in FIG. 1, it is possible to record the three color separations one after the other with full spatial resolution on a single image recording system. Such an image recording system can be, for example, a CCD camera. With the aid of the piezo adjusting elements 108, the center wavelength of the variable optical filter 100 can be shifted over the entire spectrum of visible light in times of less than 1 millisecond.
  • the variable optical filter is a Fabry-Perot interferometer with an adjustable distance 110 between the partially mirrored plates 104, 106.
  • the transmission curves of the variable optical filter must be similar to those of the R-G-B filter that is usually used.
  • This can be achieved with tunable Fabry-Perot interferometers, which are used, for example, in video technology and in particular in high-speed video technology, by using partially mirrored plates with a degree of reflection in the range from 0.3 to 0. 75, depending on the field of application, and by operating the Fabry-Perot interferometer in a lower order, ie in the first to fourth order.
  • plate distances 110 between the partially mirrored plates 104 and 106 of less than 1 ⁇ m are required.
  • the use of the low order is necessary because in the entire range of visible light, that is to say in the wavelength range from 380 nm to 780 nm, otherwise at a fixed distance between the plates of the filter, several different wavelength groups can be transmitted and thus prevent separation of the color separations would.
  • the basic structure of the variable optical filter shown in FIG. 1 comprises, as has already been described, the partially mirrored plate 104 connected to the holder 102 and the partly mirrored plate 106 which is connected to the holder 102 via the piezo elements 108 .
  • E ⁇ It is pointed out that in the embodiment shown in FIG. 1 three piezo elements or alternatively a piezo ring activator are connected to the holder 102.
  • the spring 112 is provided in order to maintain the required pressure of the second plate 106 on the piezo elements.
  • the filter shown in FIG. 1 limits the entire transmission range to the range of visible light.
  • a VIS filter with a pass band of 380 nm to 780 nm is used, for example, so that the radiation of the color recording system with radiation of a different wavelength is prevented. Irradiation with a different wavelength would falsify the inclusion of color image extracts.
  • FIG. 2 in which there is a maximum in the transmission spectrum outside the range of visible light, which would lead to falsification without using the filter mentioned above.
  • FIG. 2 shows an example of the transmission characteristics of the filter 100 as a function of the wavelength for the position of the filter 100 as a "red filter".
  • the distance between the plates 104, 106 in this example is 0.34 ⁇ m and the reflectance is 0.5. It can be clearly seen in FIG. 2 that mainly red components are let through in the region of the visible light. It is pointed out that the graphic shown in FIG. 2 only represents the principle, the phase shifts in the reflection also having to be taken into account when using real partially mirrored plates.
  • the filter is activated synchronously with the image recording, so that the different color separations can be obtained.
  • the filter By controlling the filter in the order red-green-blue-green-red-green-etc. it is possible to obtain a color image from a green image and the adjacent red and blue images. This means that the effective image frequency is halved with this special recording sequence.
  • the applicability of the color recording system according to the invention is not limited to the sequence described above. Rather, any sequences and also other color decompositions can be set at any time.

Abstract

The invention relates to a colour recording system having only one picture recording system and an optical filter (100) which can be adjusted with respect to the wavelength of the light striking the picture recording system, is in the form of a Fabry-Pérot inteferometer and has plates (104, 106) which can be displaced by piezo-electric means.

Description

Farbaufnahmesystem Color recording system
Beschreibungdescription
Die vorliegende Erfindung bezieht sich auf ein Farbaufnahme¬ system, das ein variables, optisches Filter auf der Grundla¬ ge eines Fabry-Perot-Interferometers verwendet.The present invention relates to a color recording system that uses a variable, optical filter based on a Fabry-Perot interferometer.
Auf dem Gebiet der Farbaufnahmesysteme dienen optische Fil¬ ter dazu, Farbauszüge für CCD-Kameras oder andere Bildauf¬ nehmersysteme zu erstellen.In the field of color recording systems, optical filters are used to produce color separations for CCD cameras or other image recording systems.
Der Stand der Technik muß von zwei Seiten aus betrachtet werden. Ein Ansatzpunkt ist die Farbaufnahmetechnik. Das am weitesten verbreitete Verfahren nutzt die Aufteilung des Objektbildes mittels teildurchlässiger optischer Bauelemente in drei Bilder. Unter Verwendung von Farbfiltern, meist von sogenannten R-G-B-Filtern, entstehen drei Farbauszüge, die dann drei Bildaufnehmersystemen zugeführt werden. Der Nach¬ teil dieses Verfahrens besteht darin, daß es durch die Auf¬ teilung der Gesamtintensität in drei Teilstrahlen zu einem Intensitätsverluεt kommt. Ferner werden drei Bildaufnehmer¬ systeme benötigt, wodurch bei qualitativ hochwertigen Bild¬ aufnehmersystemen große Kosten entstehen. Der Versuch, die drei Farbauszüge auf einem Bildaufnehmersystem aufzunehmen, senkt zwar die Kosten, beinhaltet jedoch den Nachteil einer geringen Ortsauflösung.The state of the art must be viewed from two sides. One starting point is the color recording technology. The most widespread method uses the division of the object image into three images by means of partially transparent optical components. Using color filters, usually so-called R-G-B filters, three color separations are created, which are then fed to three image pickup systems. The disadvantage of this method is that the division of the total intensity into three partial beams leads to an intensity loss. In addition, three image pickup systems are required, which results in high costs for high quality image pickup systems. Trying to record the three color separations on an image pickup system reduces the costs, but has the disadvantage of a low spatial resolution.
Die andere zu betrachtende Seite des Standes der Technik ist das Gebiet der Interferometrie. Ein Fabry-Perot-Interferome- ter (A. Fabry und Ch. Perot 1897) besteht aus zwei planpa¬ rallelen, teilverspiegelten Platten mit einem Spalt in der Mitte. Hierbei sind die teilverspiegelten Flächen der Plat¬ ten einander zugewandt. Dem Fabry-Perot-Interferometer liegt das Prinzip der Vielstrahlinterferenz zugrunde. Für das Ver¬ hältnis von austretender Intensität (IaUs) zu eintretender Intensität (lein) erhält man bei einem Fabry-Perot-Inter- ferometer die folgende Beziehung:The other side of the prior art to be considered is the field of interferometry. A Fabry-Perot interferometer (A. Fabry and Ch. Perot 1897) consists of two plane-parallel, partially mirrored plates with a gap in the middle. The partially mirrored surfaces of the plates face each other. The Fabry-Perot interferometer is based on the principle of multi-beam interference. For the ratio of emerging intensity (I aU s) to occur With a Fabry-Perot interferometer, the following relationship is obtained:
•'-aus • '-off
Iein ( 1 - R) 2 + 4R sin2 ( 2τrnd/ \) I a (1 - R) 2 + 4R sin 2 (2τrnd / \)
wobei gilt :where:
T = Transmission der teilverspiegelten PlattenT = transmission of the partially mirrored plates
R = Reflexion der teilverspiegelten Platten d = Breite des Spalts zwischen den Platten n = Brechungsindex des Mediums zwischen den PlattenR = reflection of the partially mirrored plates d = width of the gap between the plates n = refractive index of the medium between the plates
\ = Wellenlänge der betrachteten Strahlung\ = Wavelength of the radiation under consideration
Einsatzgebiete von Fabry-Perot-Interferometern sind vor al¬ lem die hochauflösende Spektroskopie. Hierzu werden Platten¬ abstände von mehreren Millimetern und Reflexionsgrade der teilverspiegelten Platten von über 90% gewählt. Dadurch sind extrem hohe Auflösungen erreichbar. Das Auflösungsvermögen eines Fabry-Perot-Interferometers berechnet sich nach der folgenden Gleichung:Fields of application of Fabry-Perot interferometers are primarily high-resolution spectroscopy. For this purpose, plate spacings of several millimeters and degrees of reflection of the partially mirrored plates of over 90% are selected. This enables extremely high resolutions to be achieved. The resolution of a Fabry-Perot interferometer is calculated using the following equation:
,\ 27rnd, \ 27rnd
ΔX (1 - R) XΔX (1 - R) X
wobei gilt: ^\ = Differenz zur nächsten noch auflösbarenwhere: ^ \ = difference to the next still resolvable
Wellenlänge.Wavelength.
Um einen Zugriff auf größere Wellenlängenbereiche zu ermög¬ lichen, wurden durchstimmbare Fabry-Perot-Interferometer entwickelt. Es existieren prinzipiell zwei verschiedene Mög¬ lichkeiten den Wellenlängenbereich durchzusti-nmen. Zum einen kann man den Brechungsindex des Mediums zwischen den Platten verändern, z.B. durch eine Veränderung des Drucks. Hierdurch sind sehr genau Änderungen erreichbar, wobei jedoch der Be- reich der Änderungen eng begrenzt ist. Die Alternative hier¬ zu ist die mechanische Verstellung des Abstandes der plan¬ parallelen Platten. Um diese Verstellung mit der nötigen Ge¬ nauigkeit zu erreichen, werden meist Piezoelemente verwen¬ det.Tunable Fabry-Perot interferometers have been developed to enable access to larger wavelength ranges. In principle, there are two different ways of going through the wavelength range. On the one hand, you can change the refractive index of the medium between the plates, for example by changing the pressure. Changes can be achieved very precisely as a result, but the loading range of changes is narrowly limited. The alternative to this is the mechanical adjustment of the distance between the plane-parallel plates. Piezo elements are mostly used to achieve this adjustment with the necessary accuracy.
Ausgehend von diesem Stand der Technik liegt der vorliegen¬ den Erfindung die Aufgabe zugrunde, ein Farbaufnahmesystem zu schaffen, das die Erstellung von Farbauszügen mit gerin¬ gem materiellen Aufwand, einer hohen Ortsauflösung und hoher Geschwindigkeit ermöglicht.Starting from this prior art, the present invention is based on the object of creating a color recording system which enables the production of color separations with little material expenditure, high spatial resolution and high speed.
Diese Aufgabe wird durch ein Farbaufnahmesystem nach An¬ spruch 1 gelöst.This object is achieved by a color recording system according to claim 1.
Die vorliegende Erfindung schafft ein Farbaufnahmesystem mit einem einzigen Bildaufnehmersystem und einem hinsichtlich der Wellenlänge des auf das Bildaufnehmersystems auftreffen¬ den Lichtes einstellbaren optischen Filter, welches als Fa¬ bry-Perot-Interferometer ausgebildet ist.The present invention provides a color recording system with a single image recording system and an optical filter which can be adjusted with regard to the wavelength of the light impinging on the image recording system, and which is designed as a Fibry-Perot interferometer.
Bevorzugte Weiterbildungen der vorliegenden Erfindung sind in den Unteransprüchen definiert.Preferred developments of the present invention are defined in the subclaims.
Nachfolgend wird anhand der beiliegenden Zeichnungen ein be¬ vorzugtes Ausführungsbeispiel der vorliegenden Erfindung näher beschrieben. Es zeigen:A preferred exemplary embodiment of the present invention is described in more detail below with reference to the accompanying drawings. Show it:
Fig. 1 eine Schnittdarstellung eines Fabry-Perot-Inter- ferometers, wie es bei der vorliegenden Erfindung verwendet wird; und1 shows a sectional illustration of a Fabry-Perot interferometer as used in the present invention; and
Fig. 2 eine Darstellung der Transmissionscharakteristika des Filters als Funktion der Wellenlänge bei einer vorbestimmten Einstellung.Fig. 2 shows the transmission characteristics of the filter as a function of the wavelength at a predetermined setting.
In Fig. 1 ist ein optisches Filter, das als Fabry-Perot-In¬ terferometer ausgebildet ist, dargestellt, wie es in dem er- findungsgemaßen Farbaufnahmesystem verwendet wird.1 shows an optical filter, which is designed as a Fabry-Perot interferometer, as is shown in the color recording system according to the invention is used.
Das Filter gemäß der Fig. 1 ist in seiner Gesamtheit mit dem Bezugszeichen 100 versehen.The filter according to FIG. 1 is provided with the reference number 100 in its entirety.
Das Filter umfaßt eine HalterStruktur 102, die eine erste Platte 104 trägt. Eine zweite Platte 106 ist durch mehrere piezoelektrische Elemente 108 derart gehalten, daß die erste Platte 104 und die zweite Platte 106 beabstandet voneinander in planparalleler Anordnung zueinander ausgerichtet sind. Wie es in Fig. 1 zu erkennen ist, ist zwischen der ersten Platte 104 und der zweiten Platte 106 ein Zwischenraum oder Abstand 110 gebildet. Die zweite Platte ist zusätzlich zu den Piezoelementen 108 über eine Federeinrichtung 112 mit der HaiterStruktur 102 verbunden. Die erste Platte 106 um¬ faßt eine erste Oberfläche 114, die einer ersten Oberfläche 116 der zweiten Platte 106 zugewandt ist. Die Oberflächen 114 und 116 sind teilverspiegelte Flächen.The filter includes a holder structure 102 that supports a first plate 104. A second plate 106 is held by a plurality of piezoelectric elements 108 in such a way that the first plate 104 and the second plate 106 are aligned at a distance from one another in a plane-parallel arrangement. As can be seen in FIG. 1, a space 110 is formed between the first plate 104 and the second plate 106. In addition to the piezo elements 108, the second plate is connected to the Haiter structure 102 via a spring device 112. The first plate 106 comprises a first surface 114 which faces a first surface 116 of the second plate 106. The surfaces 114 and 116 are partially mirrored surfaces.
Wie es in Fig. 1 zu sehen ist, ist die Halterstruktur so ausgebildet, daß die Platte 106 lediglich an ihren Endbe¬ reichen 118 durch die HalterStruktur 102 gehalten ist. Die HaiterStruktur 102 erstreckt sich nicht über den Bereich der Platte 1, der zwischen den Endbereichen 118 liegt, wodurch in der HaiterStruktur 102 eine Ausnehmung 120 gebildet ist, in der die planparallelen Platten 104 und 106 aufgenommen sind. Obwohl in Fig. 1 eine im wesentlichen U-förmige Hal¬ terstruktur 102 dargestellt ist, ist es offensichtlich, daß andere HalterStrukturen verwendet werden können.As can be seen in FIG. 1, the holder structure is designed in such a way that the plate 106 is held by the holder structure 102 only at its end regions 118. The Haiter structure 102 does not extend over the area of the plate 1 which lies between the end areas 118, as a result of which a recess 120 is formed in the Haiter structure 102 in which the plane-parallel plates 104 and 106 are received. Although an essentially U-shaped holder structure 102 is shown in FIG. 1, it is obvious that other holder structures can be used.
In Fig. 1 ist ein Ende der Ausnehmung 120, das benachbart zu der zweiten Platte angeordnet ist, mit einem Filter 122 ver¬ sehen.In FIG. 1, one end of the recess 120, which is arranged adjacent to the second plate, is provided with a filter 122.
Die in Fig. 1 dargestellten Platten 104 und 106 können jede geeignete Form aufweisen. Gemäß einem bevorzugten Ausfüh¬ rungsbeispiel sind die Platten kreisrund, wobei in diesem Fall auch der Halter 102 kreisförmig ausgestaltet iεt. Mit Hilfe des in Fig. 1 dargestellten variablen optischen Filters ist es möglich, die drei Farbauszüge zeitlich nach¬ einander mit voller Ortsauflösung auf einem einzigen Bild¬ aufnehmersystem aufzunehmen. Ein solches Bildaufnehmersystem kann beispielsweise eine CCD-Kamera sein. Mit Hilfe der Pie- zoverstellelemente 108 kann die Mittenwellenlänge des vari¬ ablen optischen Filters 100 in Zeiten von weniger als 1 Millisekunde über das gesamte Spektrum des sichtbaren Lichtes verschoben werden. Das variable optische Filter ist ein Fabry-Perot-Interferometer mit verstellbarem Abstand 110 der teilverspiegelten Platten 104, 106.The plates 104 and 106 shown in FIG. 1 can have any suitable shape. According to a preferred embodiment, the plates are circular, in which case the holder 102 is also circular. With the aid of the variable optical filter shown in FIG. 1, it is possible to record the three color separations one after the other with full spatial resolution on a single image recording system. Such an image recording system can be, for example, a CCD camera. With the aid of the piezo adjusting elements 108, the center wavelength of the variable optical filter 100 can be shifted over the entire spectrum of visible light in times of less than 1 millisecond. The variable optical filter is a Fabry-Perot interferometer with an adjustable distance 110 between the partially mirrored plates 104, 106.
Um den Erfordernissen der Farbaufnahmetechnik Rechnung zu tragen, müssen die Transmissionskurven des variablen opti¬ schen Filters denen der üblicherweise verwendeten R-G-B- Filter ähnlich sein. Dieε erreicht man mit durchstimmbaren Fabry-Perot-Interferometern, die beispielεweise in der Vi¬ deotechnik und insbesondere bei der Hochgeschwindigkeits- Videotechnik, ihren Einsatz finden, durch die Verwendung von teilverspiegelten Platten mit einem Reflexionsgrad im Be¬ reich von 0,3 bis 0,75, je nach Anwendungsgebiet, und durch das Betreiben des Fabry-Perot-Interferometers in einer nie¬ drigen Ordnung, d.h in der ersten bis vierten Ordnung. Hier¬ zu sind Plattenabstände 110 zwischen den teilverspiegelten Platten 104 und 106 von unter 1 μm erforderlich. Die Verwen¬ dung der niedrigen Ordnung ist erforderlich, da im gesamten Bereich des εichtbaren Lichtes, also im Wellenlängenbereich von 380 nm bis 780 nm, sonst bei einem festen Abstand der Platten des Filters mehrere verschiedene Wellenlängengruppen transmittiert werden können und εomit eine Trennung der Farbauszüge verhindert würde.In order to take into account the requirements of the color recording technology, the transmission curves of the variable optical filter must be similar to those of the R-G-B filter that is usually used. This can be achieved with tunable Fabry-Perot interferometers, which are used, for example, in video technology and in particular in high-speed video technology, by using partially mirrored plates with a degree of reflection in the range from 0.3 to 0. 75, depending on the field of application, and by operating the Fabry-Perot interferometer in a lower order, ie in the first to fourth order. For this purpose, plate distances 110 between the partially mirrored plates 104 and 106 of less than 1 μm are required. The use of the low order is necessary because in the entire range of visible light, that is to say in the wavelength range from 380 nm to 780 nm, otherwise at a fixed distance between the plates of the filter, several different wavelength groups can be transmitted and thus prevent separation of the color separations would.
Der in Fig. 1 dargestellte prinzipielle Aufbau des variablen optischen Filterε umfaßt, wie dieε bereitε beεchrieben wur¬ de, die mit dem Halter 102 verbundene teilverεpiegelte Plat¬ te 104 und die teilverεpiegelte Platte 106, die über die Piezoelemente 108 mit deren Halter 102 verbunden iεt. Eε wird darauf hingewiesen, daß bei dem in Fig. 1 dargestellten Ausführungεbeiεpiel drei Piezoelemente oder alternativ ein Piezoringaktivator mit dem Halter 102 verbunden sind. Die Feder 112 ist vorgesehen, um den erforderlichen Andruck der zweiten Platte 106 auf die Piezoelemente zu erhalten.The basic structure of the variable optical filter shown in FIG. 1 comprises, as has already been described, the partially mirrored plate 104 connected to the holder 102 and the partly mirrored plate 106 which is connected to the holder 102 via the piezo elements 108 . Eε It is pointed out that in the embodiment shown in FIG. 1 three piezo elements or alternatively a piezo ring activator are connected to the holder 102. The spring 112 is provided in order to maintain the required pressure of the second plate 106 on the piezo elements.
Neben den in Fig. 1 dargestellten Piezoverstellelementen 108 können zusätzlich mechanische Verstellelemente (nicht dar¬ gestellt) zur Grobjustierung vorgesehen εein, was größere Toleranzen bei der Herstellung des Halters erlaubt. Das in Fig. 1 dargestellte Filter beschränkt den geεamten Tranεmis- sionsbereich auf den Bereich des sichtbaren Lichtes. Hierzu wird beispielεweise ein VIS-Filter mit einem Durchlaßbereich von 380 nm bis 780 nm verwendet, so daß die Bestrahlung des Farbaufnahmesyεtems mit einer Strahlung anderer Wellenlänge verhindert wird. Die Bestrahlung mit einer anderen Wellen¬ länge würde die Aufnahme von Farbbildauszügen verfälschen. Es sei in diesem Zusammenhang bereits schon jetzt auf die Fig. 2 verwiesen, in der ein Maximum im Transmissionsεpek- trum außerhalb deε Bereichs des sichtbaren Lichtes vorhanden ist, welcheε ohne Verwendung des oben angesprochenen Filters zu der Verfälεchung führen würde.In addition to the piezo adjusting elements 108 shown in FIG. 1, mechanical adjusting elements (not shown) can also be provided for rough adjustment, which allows greater tolerances in the manufacture of the holder. The filter shown in FIG. 1 limits the entire transmission range to the range of visible light. For this purpose, a VIS filter with a pass band of 380 nm to 780 nm is used, for example, so that the radiation of the color recording system with radiation of a different wavelength is prevented. Irradiation with a different wavelength would falsify the inclusion of color image extracts. In this connection, reference is already made to FIG. 2, in which there is a maximum in the transmission spectrum outside the range of visible light, which would lead to falsification without using the filter mentioned above.
Anhand der Fig. 2 ist ein Beispiel der Transmiεεionεcharak- teristika des Filters 100 als Funktion der Wellenlänge für die Stellung des Filters 100 als "Rotfilter" aufgetragen. Der Abstand der Platten 104, 106 beträgt bei diesem Beispiel 0,34 μm und der Reflexionεgrad iεt 0,5. Eε ist in Fig. 2 deutlich zu erkennen, daß im Bereich des sichtbaren Lichteε hauptsächlich rote Anteile durchgelasεen werden. Es wird darauf hingewiesen, daß die in Fig. 2 dargeεtellte Graphik lediglich daε Prinzip darεtellt, wobei bei der Verwendung realer teilverspiegelter Platten die Phaεenverεchiebungen bei der Reflexion zuεätzlich zu berücksichtigen sind.2 shows an example of the transmission characteristics of the filter 100 as a function of the wavelength for the position of the filter 100 as a "red filter". The distance between the plates 104, 106 in this example is 0.34 μm and the reflectance is 0.5. It can be clearly seen in FIG. 2 that mainly red components are let through in the region of the visible light. It is pointed out that the graphic shown in FIG. 2 only represents the principle, the phase shifts in the reflection also having to be taken into account when using real partially mirrored plates.
Um Farbbildsequenzen in der Hochgeschwindigkeits-Videotech- nik zu gewinnen, erfolgt die Ansteuerung des Filters syn¬ chron zur Bildaufnahme, so daß zeitlich nacheinander die verschiedenen Farbauszüge gewonnen werden. Durch eine An¬ steuerung des Filters in der Reihenfolge rot-grün-blau- grün-rot-grün-uεw. iεt eε möglich, auε einem Grünbild und den benachbarten Rot- und Blaubildern ein Farbbild zu erhal¬ ten. Das heißt, daß mit dieser speziellen Aufnahmesequenz εich die effektive Bildfrequenz halbiert. Die Anwendbarkeit des erfindungsgemäßen Farbaufnahmesystems beispielsweise bei einer Hochgeschwindigkeitskamera mit variablem optischen Filter ist jedoch nicht auf die oben beschriebene Sequenz beschränkt. Vielmehr sind beliebige Sequenzen und auch an¬ dere Farbzerlegungen jederzeit einεtellbar. In order to obtain color image sequences in high-speed video technology, the filter is activated synchronously with the image recording, so that the different color separations can be obtained. By controlling the filter in the order red-green-blue-green-red-green-etc. it is possible to obtain a color image from a green image and the adjacent red and blue images. This means that the effective image frequency is halved with this special recording sequence. However, the applicability of the color recording system according to the invention, for example in a high-speed camera with a variable optical filter, is not limited to the sequence described above. Rather, any sequences and also other color decompositions can be set at any time.

Claims

Patentansprüche claims
1. Farbaufnahmesystem mit1. Color recording system with
einem einzigen Bildaufnehmersyεtem; unda single image pickup system; and
einem hinεichtlich der Wellenlänge des auf das Bild¬ aufnehmersystem auftreffenden Lichtes einstellbaren optischen Filters (100) , welches alε Fabry-Perot-In¬ terferometer auεgebildet ist.an optical filter (100) which is adjustable with regard to the wavelength of the light impinging on the image recording system and which is designed as a Fabry-Perot interferometer.
2. Farbaufnahmesystem nach Anspruch 1, dadurch gekenn¬ zeichnet,2. color recording system according to claim 1, characterized gekenn¬,
daß das Fabry-Perot-Interferometer (100) zwei vonein¬ ander beabstandete, teilverspiegelte, planparallele Platten (104, 106) umfaßt, die einen Reflexionεgrad im Bereich von 0,3 biε 0,75 haben, wobei daε Fabry-Perot- Interferometer in einer niedrigen Ordnung betrieben ist.that the Fabry-Perot interferometer (100) comprises two mutually spaced, partially mirrored, plane-parallel plates (104, 106) which have a degree of reflection in the range from 0.3 to 0.75, with the Fabry-Perot interferometer in is operated in a low order.
3. Farbaufnahmesystem nach Anspruch 2 , dadurch gekenn¬ zeichnet,3. color recording system according to claim 2, characterized gekenn¬,
daß der Abstand (116) der planparallelen Platten (104, 106) kleiner als 1 μm ist.that the distance (116) of the plane-parallel plates (104, 106) is less than 1 μm.
4. Farbaufnahmesystem nach Anspruch 2 oder 3, dadurch ge¬ kennzeichnet,4. color recording system according to claim 2 or 3, characterized ge indicates
daß der Abstand (110) der Platten (104, 106) mittels piezoelektrischer Stellelemente (108) einstellbar iεt.that the distance (110) of the plates (104, 106) is adjustable by means of piezoelectric actuating elements (108).
5. Farbaufnahmesystem nach Anεpruch 4, dadurch gekenn¬ zeichnet,5. ink recording system according to claim 4, characterized thereby,
daß zuεätzlich zu den piezoelektriεchen Stellelementen (108) mechaniεche Verεtellelemente zur Grobjustierung des Plattenabstandε (110) vorgesehen sind.that in addition to the piezoelectric actuators (108) mechanical adjustment elements for rough adjustment of the plate spacing (110) are provided.
6. Farbaufnahmesyεtem nach einem der Anεprüche 1 biε 5, dadurch gekennzeichnet,6. Color recording system according to one of claims 1 to 5, characterized in that
daß das Bildaufnehmersystem eine CCD-Kamera ist. that the image pickup system is a CCD camera.
PCT/EP1996/003860 1995-10-25 1996-09-03 Colour recording system WO1997015810A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19539679 1995-10-25
DE19539679.0 1995-10-25
DE19623280.5 1996-06-11
DE19623280A DE19623280A1 (en) 1995-10-25 1996-06-11 Color recording system

Publications (1)

Publication Number Publication Date
WO1997015810A1 true WO1997015810A1 (en) 1997-05-01

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19804532A1 (en) * 1998-02-05 1999-08-12 Herolab Gmbh Device for the optical examination of samples
CN107479185A (en) * 2017-09-30 2017-12-15 广东欧珀移动通信有限公司 Optical filter, display device and electronic installation
CN108955877A (en) * 2012-09-12 2018-12-07 精工爱普生株式会社 Driving method and spectral photometry method

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Publication number Priority date Publication date Assignee Title
US4553816A (en) * 1980-12-15 1985-11-19 Honeywell Inc. Tunable Fabry-Perot filter
JPH01260330A (en) * 1988-04-11 1989-10-17 Sharp Corp Color recognizing apparatus
US5142414A (en) * 1991-04-22 1992-08-25 Koehler Dale R Electrically actuatable temporal tristimulus-color device

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Publication number Priority date Publication date Assignee Title
US4553816A (en) * 1980-12-15 1985-11-19 Honeywell Inc. Tunable Fabry-Perot filter
JPH01260330A (en) * 1988-04-11 1989-10-17 Sharp Corp Color recognizing apparatus
US5142414A (en) * 1991-04-22 1992-08-25 Koehler Dale R Electrically actuatable temporal tristimulus-color device

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19804532A1 (en) * 1998-02-05 1999-08-12 Herolab Gmbh Device for the optical examination of samples
CN108955877A (en) * 2012-09-12 2018-12-07 精工爱普生株式会社 Driving method and spectral photometry method
CN107479185A (en) * 2017-09-30 2017-12-15 广东欧珀移动通信有限公司 Optical filter, display device and electronic installation

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