WO2011141551A1 - Système de projection cinématographique stéréoscopique - Google Patents

Système de projection cinématographique stéréoscopique Download PDF

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Publication number
WO2011141551A1
WO2011141551A1 PCT/EP2011/057703 EP2011057703W WO2011141551A1 WO 2011141551 A1 WO2011141551 A1 WO 2011141551A1 EP 2011057703 W EP2011057703 W EP 2011057703W WO 2011141551 A1 WO2011141551 A1 WO 2011141551A1
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WO
WIPO (PCT)
Prior art keywords
image
eye
polarizer
projection
polarizers
Prior art date
Application number
PCT/EP2011/057703
Other languages
German (de)
English (en)
Inventor
Dwight Lindsey
Lingli Wang
Original Assignee
Jos. Schneider Optische Werke Gmbh
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
Application filed by Jos. Schneider Optische Werke Gmbh filed Critical Jos. Schneider Optische Werke Gmbh
Publication of WO2011141551A1 publication Critical patent/WO2011141551A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/398—Synchronisation thereof; Control thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/337—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using polarisation multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/363—Image reproducers using image projection screens

Definitions

  • the invention relates to an optical system for the projection of stereoscopic images, in particular in SD cinema projection.
  • pairwise images also referred to as stereoscopic half-images or partial images, are generated separately for each eye and offered for viewing for spatial-accurate imaging.
  • Techniques for generating and displaying three-dimensional images are based on the principle of natural vision with two eyes. Due to the distance between the two eyes, one sees with the left eye an object from a slightly different viewing direction than with the right eye. This - in perspective differing ⁇ chen - views are merged in the visual center of the human brain into a single plastic perception.
  • this stereoscopic partial images must be presented separately to the eyes, so that only the right image is considerate ⁇ bar for the left eye only the left image and the right eye.
  • the aid-free stereo playback which allows the viewing of stereoscopic content without special glasses, displays or other aids.
  • the methods used here require a conscious separation of the image perception by the human eye and must therefore be trained by the viewer;
  • the passive systems in which the playback takes place on a kon ⁇ conventional, two-dimensional medium and is viewed with glasses without electronic control.
  • Passive systems include polarization technology
  • Head-mounted displays, autostereoscopic displays and at the other ⁇ re constructions that have been specially designed for 3D playback opti ⁇ mized or developed are summarized in a group of SD displays.
  • the polarization technique exploits the polarization properties of the light for channel separation. It is between linea- and circular polarization. Both variants are used for stereo projection, with linear polarization being the most widely used by far.
  • the reproduction usually takes place with two projectors in which, in the case of linear polarization, polarization filters offset by 90 °, also called polar filters, are placed in front of the objectives.
  • polarization filters offset by 90 ° also called polar filters
  • V arrangement is preferred, ie a polarization direction of 45 ° for the right and 135 ° for the left representation is used.
  • the two images are on a polarisationserhal- Tenden screen (projected image) in synchronism one above the other proji ⁇ sheet and viewed through spectacles with polarizing filters in the same Anord ⁇ voltage.
  • a disadvantage is that the selected circular polarizing filter show optimal behavior only for a certain wavelength, which is usually chosen in the middle of the visible spectrum. At the edges of the visible
  • linear polarizing filters which have a smaller amount of picture interference, at least with exact alignment with circular polarizers, are still very frequently used.
  • the achievable quality of the 3D rendering strongly depends on the filters used and the projection screen.
  • a metallised surface is used as the projection surface.
  • the polarizers absorb a portion of the tes, so compared to a two-dimensional presentation brighter projectors are needed.
  • the object of the invention is to provide a simple system for the projection of stereoscopic images.
  • a stereoscopic cinema projection system having a projector for projecting films with an image forming unit and a projection lens mount for fixing a projection lens to the projector.
  • the image-forming unit of the projector comprises a light source ⁇ , as well as analog or digital means of image generation.
  • the projector is equipped with a device designed for this purpose.
  • the projection lens which is not part of the projector, can be attached to this image capture.
  • the projection lens mount is used for the projection object. tively have a standardized configuration, for example, this may be a bayonet o. ⁇ . Such a configuration of the projection lens holder allows the use übli ⁇ cher projection lenses.
  • an optical path passes from the image-forming unit to the projection lens mount.
  • the beam path from the light source passes through the film to the projection lens.
  • the system is designed to be able to project films alternately displaying one image for a first
  • the generation of the stereoscopic partial images for the left or right eye of a viewer by the image-forming unit of the projector can be realized by the analog method with conventional film material or digital ⁇ who.
  • the two partial images provided by the projector are each provided only for the perception by one of the observer's eyes, ie each partial image is made visible only to the first or left eye or the second or right eye (or vice versa).
  • both partial images are projected onto a projection screen.
  • the partial images are generated at twice the frame rate (eg 50 Hz), based on the frame rate required for a 2D projection (eg 25 Hz), since two images must always be alternately projected, one for the right one and one for the left eye, without which the Jardinfre ⁇ quency per eye may sink. Otherwise, a flicker would be perceived by the viewer.
  • the system has at least one linear polarizer for polarizing the light emanating from the projector, and furthermore at least one right-handed circular polarizer for light, which forms the image for the first eye of the Viewer projects, and at least one left-handed circular polarizer for light, which projects the image for the second eye of the observer.
  • a linear polarizer is arranged in the beam path, behind it a circular polarizer (eg a ⁇ / 4 plate) in the direction of the projection screen. Both can both be a separate construction or else be cemented together (so-called C-pole filter).
  • the system has a changing means for alternately introducing the right- or left-handed circular polarizing filter in the beam path.
  • the changing device is designed such that it can be integrated into a projection lens, which can be fixed in the projection lens recording.
  • the AC frequency of the AC device is DER art to the speed of the image forming unit from ⁇ voted that is synchronous to a picture change, a change from a right-handed circular polarizer to a left-handed circular polarizer, or vice versa.
  • the outer diameter of the changing device is advantageously less than or equal to 125 mm.
  • the alternating introduction of the right- or left-handed circular polarization filter in the beam path is carried out by the change device of the system.
  • This device for alternately introducing the filter into the beam path serves as a carrier for the actual polarizing material and can be designed such that the introduction by rotation, flaps, pivoting, rotation about an axis perpendicular to the plane of the circular filter (filter wheel), or around an axis in the plane of the circular filter (filter swing or folding mechanism) takes place.
  • Filter wheel and linear polarizer are arranged to each other that the beam path of each sub-image, which is supplied by the image-forming unit, each passes only through a concrete field of the filter wheel.
  • the rotation of the filter wheel is controlled so that the
  • Change of the polarization direction is synchronous to the change of the respective stereoscopic partial image, which is supplied by the image-forming unit projector.
  • the drive for the rotation of the filter wheel can take place, for example, by an electric motor.
  • As a filter wheel, in a projection lens offers the ability to easily install the filter wheel or expand to switch the system between 2D and 3D Proj ection. Due to their small size, the systems designed in this way are also suitable for home cinema applications.
  • Light is a transverse electromagnetic wave whose
  • Light whose field vector E oscillates in one direction is called linearly polarized light.
  • the polarization direction is the direction in which the field vector E oscillates.
  • ⁇ perpendicular to the reflecting surface Einfallsebe ⁇ ne.
  • Light whose plane of polarization is perpendicular to the Einfallsebe ⁇ ne, is s-polarized and light whose polarization- ⁇ onsebene is parallel to the plane of incidence, p-polarized light.
  • Circular polarization also called rotating polarization
  • E-vector electric field vector
  • Circular polarizers in particular in the form of so-called lambda / 4 plates, are initially only suitable for a very narrow wavelength range.
  • 29ie ⁇ dener lambda / 4 plates can also create broadband circular polarizers, suitable z. For example, for wavelengths from 430 nm to 680 nm.
  • a metallic projection screen it is necessary to use a metallic projection screen.
  • a so-called silver screen silver screen
  • surface sealing plastic coating
  • a visual ⁇ help is still needed for the two eyes of a viewer, wherein a lens for. B. contains a left-handed circular polarizer for the first eye and a
  • Lens for the other eye contains a right rotating Zirku ⁇ lar polarizer.
  • the polarizing filters in the beam path after the image-forming unit are set up so that by the visual aid (glasses), the left eye, the left and right eye of the observer sees only the right field only, which has been projected onto the Pro ⁇ jetechnischswand.
  • As a filter wheel, in a projection lens offers the ability to easily install the filter wheel or expand to the system to switch between 2D and 3D projection. Due to their small size, the systems designed in this way are also suitable for home cinema applications.
  • linear polarizer and circular polarizer ( ⁇ / 4-plate) can be positioned at different locations, in particular (in order from the image-forming unit) in the following combinations (Table 1):
  • a wire-grid polarizer is used as the linear polarizer and quartz glass is used as the carrier material for the clockwise and counterclockwise circular polarizers.
  • a wire grid polarizer (WGP) consists of an array of parallel wires. It is permeable only to electromagnetic waves whose polarization is perpendicular to the wires.
  • wire grid polarizers and quartz glass as a carrier material for the circular polarizers is in ⁇ particular advantage in the arrangement of the polarizers in areas of the system in which a relatively high temperature, since the above materials have a relatively high heat resistance ⁇ exhibit.
  • Such critical temperatures are z. B. in the area between image-forming unit and projection lens.
  • the WGP is fixed while the circular polarizers rotate with the filter wheel.
  • Typical angles are 0 ° and 90 °, ie 90 ° rotated against each other, or + 45 ° and -45 ° (or 315 °) or 135 °, ie also 90 ° rotated against each other.
  • Fig. 1 is a schematic representation of the system for SD cinema projection
  • 2A is a schematic representation of a first variant ei Nes filter wheel.
  • Fig. 2B is a schematic representation of a second variant of a filter wheel.
  • FIG. 1 shows a preferred embodiment of the system 100 for stereoscopic (3D) cinema projection with:
  • the two stereoscopic partial images are in the projector 102 with a light source 104 and the image-forming unit 106 generated alternately.
  • the beam path of each of the two unpolarized fields passes through the linear polarizer 108, e.g. B. a WGP.
  • the beam path of the meanwhile linearly polarized light of the partial images extends from the linear polarizer 108 to the projection objective 112.
  • the filter lens 110 is integrated into the projection objective 112 with the circular polarizers.
  • the further beam ⁇ passes through the projection lens 112 and at the same time through the filter wheel 110.
  • the light of the now left or right-rotating circularly polarized partial images is now by means of the projection lens 112 proji ⁇ on the screen 114.
  • the two partial images are in the perception of
  • a favorable embodiment variant for example, the embodiment of this device as so-called.
  • Filter wheel polarizer wheel
  • Such a filter wheel can be designed such that it is in the range of rotation of each having 180 ° a plurality of fields only with left or only with right-handed circular polarizers. This means that the filter wheel changes direction of polarization after each rotation through 180 °. This change takes place continuously with the rotation of the filter wheel.
  • the circular polarizers can also be arranged in the fields such that the circular polarization direction changes over the entire rotation range of 360 ° after each field.
  • the individual fields of the filter wheel are formed by spoke-like running and arranged separating devices, between which the left- or right-handed circular polarizers are firmly inserted.
  • FIGS. 2A and 2B show the aforementioned two options for configuring the changing device 110 (filter wheel) with left-handed and right-handed rotating circular polarizers.
  • Fig. 2A shows the arrangement of a plurality of circular polarizer fields, where in each case after a rotation of 180 °, the polarization direction changes.
  • FIG. 2B shows the variant in which, during the rotary movement 306 of the changing device 110, a change occurs between left and right-rotating circular polarization 302, 304 after each field change.
  • linear wire grid polarizer Wire Grid Polarizer

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

L'invention concerne un système (100) de projection cinématographique stéréoscopique, comprenant au moins un projecteur (102) pour la projection de deux images partielles stéréoscopiques. Les trajectoires du faisceau de lumière non polarisée émise par l'unité (106) productrice d'images du projecteur (102) s'étendent, entre autres, respectivement, à travers un polariseur linéaire (108). Une autre polarisation de la lumière des images partielles différentes pour les deux yeux (122, 124) d'un observateur, produites à une fréquence d'images déterminée, s'effectue par des polariseurs circulaires (302, 304) à rotation gauche ou droite, qui sont disposés sur un changeur (roue filtre) (110). Après traversée des polariseurs circulaires (302, 302), les images partielles à polarisation circulaire différente, sont projetées sur un écran de projection métallique (114). Au moyen d'une lunette (116), dont les verres (118, 120) sont garnis différemment pour chaque oeil (122, 124), d'un polariseur circulaire gauche ou droite (302, 304), chaque image partielle est produite et rendue visible en 3D, uniquement pour le premier oeil, éventuellement, gauche (122), ou le second oeil, éventuellement, droit (124) (ou inversement) de l'observateur en 3D.
PCT/EP2011/057703 2010-05-12 2011-05-12 Système de projection cinématographique stéréoscopique WO2011141551A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010020405A DE102010020405A1 (de) 2010-05-12 2010-05-12 System zur stereoskopischen Kino-Projektion
DE102010020405.6 2010-05-12

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WO2011141551A1 true WO2011141551A1 (fr) 2011-11-17

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WO (1) WO2011141551A1 (fr)

Cited By (1)

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CN103676180A (zh) * 2012-09-26 2014-03-26 上海蝶维影像科技有限公司 圆偏振光学系统3d转换系统

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US20070132953A1 (en) * 2005-12-14 2007-06-14 Eastman Kodak Company Stereoscopic display apparatus using LCD panel
US20070139624A1 (en) * 2005-12-21 2007-06-21 International Business Machines Corporation Method and system for synchronizing opto-mechanical filters to a series of video synchronization pulses and derivatives thereof
EP2037690A1 (fr) * 2007-09-17 2009-03-18 KINOTON GmbH Dispositif et procédé pour la projection à grande échelle d'images de film sur un écran

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US20070132953A1 (en) * 2005-12-14 2007-06-14 Eastman Kodak Company Stereoscopic display apparatus using LCD panel
US20070139624A1 (en) * 2005-12-21 2007-06-21 International Business Machines Corporation Method and system for synchronizing opto-mechanical filters to a series of video synchronization pulses and derivatives thereof
EP2037690A1 (fr) * 2007-09-17 2009-03-18 KINOTON GmbH Dispositif et procédé pour la projection à grande échelle d'images de film sur un écran

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103676180A (zh) * 2012-09-26 2014-03-26 上海蝶维影像科技有限公司 圆偏振光学系统3d转换系统

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