WO1997015810A1 - Systeme d'enregistrement de couleurs - Google Patents

Systeme d'enregistrement de couleurs Download PDF

Info

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
Authority
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)
English (en)
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/de
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/fr

Links

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.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

L'invention concerne un système d'enregistrement de couleurs comportant un seul système de prise de vues et un filtre optique (100) qui permet un réglage en ce qui concerne la longueur d'onde de la lumière frappant le système de prise de vues et qui est conçu sous forme d'interféromètre Fabry-Pérot dont les plaques (104, 106) peuvent être déplacées par des moyens piezo-électriques.
PCT/EP1996/003860 1995-10-25 1996-09-03 Systeme d'enregistrement de couleurs WO1997015810A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19539679 1995-10-25
DE19539679.0 1995-10-25
DE19623280A DE19623280A1 (de) 1995-10-25 1996-06-11 Farbaufnahmesystem
DE19623280.5 1996-06-11

Publications (1)

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

Family

ID=26019761

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/003860 WO1997015810A1 (fr) 1995-10-25 1996-09-03 Systeme d'enregistrement de couleurs

Country Status (1)

Country Link
WO (1) WO1997015810A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19804532A1 (de) * 1998-02-05 1999-08-12 Herolab Gmbh Vorrichtung zur optischen Untersuchung von Proben
CN107479185A (zh) * 2017-09-30 2017-12-15 广东欧珀移动通信有限公司 滤光片、显示装置和电子装置
CN108955877A (zh) * 2012-09-12 2018-12-07 精工爱普生株式会社 驱动方法以及分光测定方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553816A (en) * 1980-12-15 1985-11-19 Honeywell Inc. Tunable Fabry-Perot filter
JPH01260330A (ja) * 1988-04-11 1989-10-17 Sharp Corp 色認識装置
US5142414A (en) * 1991-04-22 1992-08-25 Koehler Dale R Electrically actuatable temporal tristimulus-color device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553816A (en) * 1980-12-15 1985-11-19 Honeywell Inc. Tunable Fabry-Perot filter
JPH01260330A (ja) * 1988-04-11 1989-10-17 Sharp Corp 色認識装置
US5142414A (en) * 1991-04-22 1992-08-25 Koehler Dale R Electrically actuatable temporal tristimulus-color device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 011 (P - 988) 11 January 1990 (1990-01-11) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19804532A1 (de) * 1998-02-05 1999-08-12 Herolab Gmbh Vorrichtung zur optischen Untersuchung von Proben
CN108955877A (zh) * 2012-09-12 2018-12-07 精工爱普生株式会社 驱动方法以及分光测定方法
CN107479185A (zh) * 2017-09-30 2017-12-15 广东欧珀移动通信有限公司 滤光片、显示装置和电子装置

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