WO2002023902A1 - Systeme interactif audiovisuel - Google Patents
Systeme interactif audiovisuelInfo
- Publication number
- WO2002023902A1 WO2002023902A1 PCT/FR2001/002874 FR0102874W WO0223902A1 WO 2002023902 A1 WO2002023902 A1 WO 2002023902A1 FR 0102874 W FR0102874 W FR 0102874W WO 0223902 A1 WO0223902 A1 WO 0223902A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mirror
- image
- scene
- screen
- camera
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/15—Conference systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
- H04N7/142—Constructional details of the terminal equipment, e.g. arrangements of the camera and the display
- H04N7/144—Constructional details of the terminal equipment, e.g. arrangements of the camera and the display camera and display on the same optical axis, e.g. optically multiplexing the camera and display for eye to eye contact
Definitions
- the invention relates to an interactive audiovisual system between a local scene and a distant scene, comprising at least one device for taking pictures of the local scene and a device for reproducing the image of the distant scene intended for the local scene.
- the field of the invention is that of telepresence making it possible to bring together a local scene and a distant scene.
- telepresence makes it possible to bring together a local scene and a distant scene.
- Telepresence is an extension of videoconferencing.
- Telepresence like videoconferencing is obtained through the transmission of image, sound or even data representing texts, graphics, slide shows, etc.
- a scene can take place outside, it usually takes place in a building. Therefore, 'by local hall will be designated the place where the local scene takes place and remote room, where the remote scene takes place.
- the transmission of the image of a local room SL having a shooting device 1 towards a remote room SD having a restitution device follows a route schematically represented FIG. 1 comprising a shooting device 1 such as a camera, possibly an analog digital CAN converter, a coding system C, a transmission network R, - a decoding system D, possibly a digital analog converter DAC and a image rendering device 2 such as a projector P coupled to a screen E.
- This screen can be a plasma screen, LCD screen, CRT screen, etc.
- the chain represented in FIG. 1 is reproduced in the opposite direction from the remote room SD where the shooting takes place to the local room SL where the restitution takes place.
- Each room is finally equipped with both a shooting device and a rendering device.
- an audiovisual interactive system will be used to designate a system located in a room and comprising at least one shooting device and one rendering device.
- videoconferencing systems are known. These video conferencing systems come in different trained: Room "video conferencing, video phone, personal computer (PC) communicating multimedia, interactive terminal, etc.
- FIG. 2a) represents schematically seen from above, a shooting device 1 located in a local room SL, filming a local scene, represented by local participants PL seated around a table situated for example approximately 1 m from the camera which has a large angle of view ⁇ .
- the direction of the gaze of these participants is indicated by the small line supposed to represent the nose of the participant.
- On a screen E is formed the image of the remote participants PD, in particular the image of the remote participant d.
- a local participant a who is not in the axis of the camera represented by the ray bl, addresses a distant participant, he looked at the image of this distant participant on the 'screen E. Although viewed from the front along the radius ad', the camera receives the radius al, and finally films the participant a in profile.
- the size of the participants or objects during the return varies depending on the party of the field in which they are located and according to the angle of field ⁇ of the camera. If you want to film several participants or objects, you have to widen the field, but the restored images are somewhat curved insofar as the perspective effects are distorted on the edges of the image; the restored images have a variable magnification effect illustrated by FIGS. 3a) and 3b) and well known to photographers using a wide angle as a lens.
- the shooting fields have common areas or overlaps ZR and that the images restored on one or more adjacent rendering devices each corresponding to a shooting device, will exhibit discontinuities originating from the duplicated parts or overlaps.
- the multiple reproduction of the same scene taken by different cameras whose fields partially overlap is called overlapping of view.
- This phenomenon of overlapping views increases when the angle of view of the cameras increases.
- Image processing software is currently being developed to solve this problem, but it has not yet given satisfactory results.
- the invention aims to solve these problems related to the false token effect, the distorted perspective and possibly the overlapping of views of current videoconferencing systems by an interactive audiovisual system including a mirror which makes it possible to reduce the angle of field of the device. shooting, without limiting the scene.
- a first approach consists in considering a shooting device comprising a mirror 11 and a camera 12 as shown in FIG. 5.
- the plane mirror 11 is placed facing and at the distance D from the scene to be filmed so that the camera 12 films the image of this scene in the mirror 11.
- the scene to be filmed is the virtual image taken up by the mirror 11. If the mirror 11 is plane, the scene to be filmed is twice as far (in 2D) from the camera 12, that if camera 12 were placed in place of the mirror 11.
- Such a mirror thus makes it possible to artificially distance the scene and therefore to reduce the angle of field of the shooting device, in this case the camera.
- the size of the image of a lateral object will be respected in the same proportions as the size of an object close to the optical axis of the ST system: the size for example of the image B'C d 'a lateral object BC will be respected in the same proportions as the size of A'B'.
- the ST system as described is telecentric in the image space, in which the rays are parallel; similarly, a system can be telecentric in object space.
- the subject of the invention is an interactive audiovisual system between a local scene and a distant scene, comprising at least one device 1 for taking pictures of the local scene and a device 2 for rendering the image of the distant scene in a image plane I, mainly characterized in that said device 1 for taking pictures comprises at least one camera 12 and a mirror 11 capable of returning to said camera 12 the parallel rays coming from the local scene and perpendicular to the image plane I.
- the mirror 11 and the camera 12 form a telecentric assembly.
- the mirror 11 is concave and has a focal point and the camera 12 is located in the vicinity of the focal point of said mirror 11 which can be cylindrical or toric or of revolution.
- the rendering device 2 comprises at least one screen E on which the image of the distant scene is formed and a semi-transparent mirror 21 capable of forming the image of the screen E in the image plane I , said semi-transparent mirror 21 being placed between the mirror 11 of the camera and the local scene so that the rays pass through said semi-transparent mirror 21 and reach the mirror 11 of the camera.
- the semi-transparent mirror 21 can be flat or concave.
- the mirror According to an additional characteristic, the mirror
- the system further comprises a projector P located in the vicinity of the focus of said mirror 21 which can be cylindrical or toric or of revolution.
- the rendering device comprises at least one projector P projecting the image of the distant scene on a screen E, the mirror
- the shooting device 11 of the shooting device being able to form in the image plane I, the image of the screen E. It may further comprise a plane mirror 22 situated and oriented so as to send the image of the screen E to the mirror 11 of the shooting device.
- the projector P can be located at the focal point of the mirror 11 of the shooting device. Likewise, the projector P, screen E and mirror 11 assembly of the reproduction device can form a telecentric assembly.
- the system comprises several shooting devices and / or several rendering devices which can be aligned or arranged according to a convex curve.
- the subject of the invention is also an interactive audiovisual system between a local scene and a distant scene, comprising at least one device for taking pictures of the local scene and a device for reproducing the image of the distant scene in a plane.
- image I characterized in that said rendering device 1 comprises at least one projector P and a screen E on which the image of the distant scene is projected and a mirror 21 capable of forming the image of the screen E in the image plan I.
- the mirror is concave and the mirror 21, the projector P and the screen E form a telecentric assembly.
- the mirror 21 of the rendering device can be a cylindrical or toric or revolution mirror.
- the mirror or mirrors are made of a resin covered with a reflective surface.
- FIGS. 3a) and 3b), already described, illustrate the magnification effect of the restored image as a function of the angle of field of the shooting device
- FIG. 4a) and 4b), already described, show overlapping zones in the case of two and three shooting devices respectively
- - Figure 5 already described schematically represents a shooting device comprising a plane mirror
- FIG. 6 already described schematically represents a telecentric optical system
- FIG. 7 schematically represents a telecentric shooting device according to the invention
- FIG. 8 schematically represents a cylindrical mirror with which an asymmetrical telecentrism is obtained
- FIGS. 9a), 9b) and 9c) schematically represent three embodiments of an interactive audiovisual system according to the invention, the shooting and reproduction devices being decoupled,
- FIG. 10 schematically shows another embodiment of an interactive audiovisual system according to the invention, the shooting and reproduction devices being coupled
- - Figure 11 schematically represents several aligned shooting devices
- Figure 12 schematically represents several interactive audiovisual systems according to the invention, aligned.
- a telecentric shooting device 1 comprising a concave mirror 11 placed facing the local scene to be filmed, represented in the figure by participants PL, and a camera 12 capable of filming the image produced by this mirror 11.
- the camera optics can be adjusted to improve telecentrism.
- the mirror is generated according to a curve having a focal point and the camera is approximately located at the focal point of the concave mirror; the mirror and the camera then constitute a telecentric assembly.
- the hearth is possibly in the plane of the scene to be filmed.
- the rendering device is not represented in FIG. 7, the image plane I has been shown in which the local participants PL see the image of the distant scene.
- the plane (s) of the local scene is (are) parallel (s) to the image plane I.
- the mirror 11 folds back towards the camera 12, the beam consisting of all the parallel rays coming from the scene to be filmed.
- the telecentrism obtained can be asymmetrical by using a mirror 11 made up of a portion of cylinder along an axis yy '.
- the cylinder can be circular or be generated according to another curve having a focal point.
- the image obtained can be anamorphic for particular applications.
- the scene to be filmed is represented in an object plane 0 parallel to the plane xx ', yy'. Although represented by this plane 0, the scene to be filmed can have a depth along the axis zz 'and thus be made up of several planes 0.
- FIGS. 9a) and 9b an interactive audiovisual system according to the invention is shown, comprising a telecentric shooting device and a functionally separated restitution device.
- the shooting device comprises a mirror 11, concave and inclined, that is to say such that the axis between the mirror 11 and its focus is not confused with the perpendicular LD to the plane 0 of the scene to be filmed , and a camera 12 located in the vicinity of the focal point of the mirror 11.
- neighborhood of the focal point is meant a small area comprising this focal point and the surrounding.
- the mirror 11 and the camera 12 form a telecentric assembly: the camera 12 films the local scene in telecentric mode, reflecting on the mirror 11.
- the rendering device 2 comprises a projector (not shown) and a screen E on which the image of the distant scene is formed: the screen E does not face the local participants PL. It is for example located in a plane perpendicular to the plane 0 of the scene to be filmed.
- the device 2 also includes a semi-transparent plane mirror 21 which makes it possible to return the image of the screen E to the image I plane, intended for local participants PL.
- the plane mirror 21 is oriented so that the plane I is parallel to the plane 0. It is for example oriented at 45 °.
- the semi-transparent plane mirror 21 also lets through to the mirror 11, the rays coming from the scene to be filmed and perpendicular to the image plane I.
- the rendering device 2 comprises a projector P and a screen E on which the image of the distant scene is projected; screen E does not face the local participants PL.
- the device 2 includes a cylindrical mirror 21 i i-transparent which makes it possible to return the image of the screen E to the local participants PL, the mirror E.
- the mirror 21 is oriented so that the plane I is parallel to plane 0.
- the mirror 21 enlarges the image of the screen to bring it to the desired virtual size. It enlarges it in dimension tangential; in the direction of the generator, it acts as a plane mirror.
- the cylindrical mirror 21 can also serve as an optical corrector of the camera, in particular by correcting aberrations of apertures just like a Schmitt blade on a telescope.
- the semi-transparent mirror 21 also lets through to the mirror 11, the rays coming from the scene to be filmed and perpendicular to the image plane I.
- a transmission coefficient of 30% and a reflection coefficient of 70% promoting the luminance of the image observed by the local participants.
- the camera 12 is sensitive enough to remain effective with a beam attenuated by 70%.
- the shooting and the restitution are decoupled.
- the shooting is telecentric.
- the projector P, screen and mirror 21 assembly sends back to the local participants, "the rendered image of the distant scene in a parallel beam, this assembly is telecentric; the rendering device is then also telecentric When this beam is not parallel as shown in FIG. 9a), the restitution is not telecentric.
- the filmed scene will not present the defects linked to the false token effect, to the distorted perspective, ..., nor the restored image of this scene. But if at the origin of the restored image, the shooting was not carried out with a telecentric device, the filmed scene will possibly have said defects which will also appear in the restored image of this scene.
- the shooting and restitution devices are decoupled, but only the restitution device is telecentric.
- the acquisition device 1 comparable to that of FIG. 2a) is not telecentric.
- the rendering device consists of a projector P, a screen E and a semi-transparent cylindrical mirror 21, the projector P being located in the vicinity of the focal point of the mirror 21: the rendering device is telecentric.
- FIG. 10 shows another embodiment of an interactive audiovisual system according to the invention, such as shooting and restitution are coupled.
- the shooting device comprises a concave mirror 11 having a focal point and a camera 12 located in the vicinity of this focal point where the rays coming from the scene to be filmed and which are perpendicular to the image plane converge. I and returned by the mirror 11 as described for FIG. 7.
- the camera can be located in the plane of the scene to be filmed. The path of one of these rays is shown by a line with two arrows.
- the rendering device comprises a projector (not shown), a screen E onto which the image of the distant scene is projected and a plane mirror 22 receiving the image of the screen E.
- the screen E can be a cardboard, a cathode or plasma screen, etc.
- the mirror 22 is inclined so as to return the image of the screen E on the concave mirror 11 intended for the local participants PL.
- the path of the image from screen E to the participant PL is indicated by the line with an arrow.
- the mirror 22 can be removed and replaced by the screen E.
- the mirror 11 is used both by the shooting device and by the rendering device.
- the camera consisting of the mirror 11 and the camera 12 located at the focus of the mirror 11, is telecentric.
- the “restitution” device consists of the mirror 11, the screen E and the projector P. Depending on whether or not the projector P is located at the focal point of the mirror 11
- the rendering device is or is not telecentric.
- the shooting devices may or may not be contiguous.
- Each shooting device films a portion of the local scene.
- the phenomenon of overlapping of views as represented in FIGS. 4a) and 4b) is considerably reduced insofar as the rays picked up by the cameras 12 come from rays parallel to each other, or almost parallel according to the telecentrism tolerances that the system allows, which was not the case for the shooting devices of Figures 4a) and 4b).
- the overlap zones will be almost nonexistent.
- the images restored by possibly aligned rendering devices, a rendering device corresponding for example to a shooting device will hardly present any discontinuity between them. It is not necessary to have as many restitution devices as there are shooting devices.
- the images filmed by the cameras can be concatenated before their restitution, preferably by an image processing software, to form only one image to be restored. This can itself be distributed over several juxtaposed screens.
- the shooting devices and / or the rendering devices can also be arranged according to a convex curve, for example in an arc of a circle.
- FIG. 9b Several interactive audiovisual systems as shown in Figure 9b) can be aligned as shown in Figure 12.
- Each shooting device telecentric (camera 12 and mirror 11) films a portion of the local scene and local participants will be able to observe the distant scene restored in continuity from a restitution device (screen E and semi-transparent mirror 21) to the other.
- Such audiovisual interactive systems according to the invention can be used in contexts other than that of videoconferencing.
- the systems can be multiplied in various configurations so as to form a kiosk or a telepresence wall in a hall, in the street, etc., connected almost permanently to another kiosk or remote telepresence wall. It is no longer necessary to reserve the service as is often the case today for videoconferencing systems.
- a person passing in front of a telepresence wall located for example in Paris can communicate separately or informally with a distant person passing in front of another telepresence wall located for example in France and connected to that of Paris, as if they met in the street, in a corridor, etc. These distant people can for example walk "side by side".
- the mirrors can be made of a resin covered with a reflective surface possibly plastic.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Stereoscopic And Panoramic Photography (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Lenses (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002527207A JP2004509530A (ja) | 2000-09-15 | 2001-09-14 | 双方向視聴覚システム |
KR10-2003-7003828A KR20030061804A (ko) | 2000-09-15 | 2001-09-14 | 대화형 시청각 시스템 |
US10/380,684 US7048386B2 (en) | 2000-09-15 | 2001-09-14 | Interactive audio-visual system |
EP01972157A EP1317854A1 (fr) | 2000-09-15 | 2001-09-14 | Systeme interactif audiovisuel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR00/11773 | 2000-09-15 | ||
FR0011773A FR2814309B1 (fr) | 2000-09-15 | 2000-09-15 | Systeme interactif audiovisuel |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002023902A1 true WO2002023902A1 (fr) | 2002-03-21 |
Family
ID=8854335
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/002874 WO2002023902A1 (fr) | 2000-09-15 | 2001-09-14 | Systeme interactif audiovisuel |
Country Status (6)
Country | Link |
---|---|
US (1) | US7048386B2 (fr) |
EP (1) | EP1317854A1 (fr) |
JP (1) | JP2004509530A (fr) |
KR (1) | KR20030061804A (fr) |
FR (1) | FR2814309B1 (fr) |
WO (1) | WO2002023902A1 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003101101A1 (fr) * | 2002-05-28 | 2003-12-04 | Seos Limited | Appareil terminal pour videoconference, avec un miroir incurve assurant une transmission partielle |
FR2841420A1 (fr) * | 2002-06-25 | 2003-12-26 | France Telecom | Systeme audiovisuel pour l'etablissement d'une communication bidirectionnelle entre une premiere scene et une deuxieme scene |
WO2004008686A1 (fr) * | 2002-07-10 | 2004-01-22 | Lg Electronics Inc. | Systeme de commande a distance d'un reseau domestique |
FR2848762A1 (fr) * | 2002-12-13 | 2004-06-18 | France Telecom | Systeme audiovisuel interactif |
US7486325B2 (en) | 2002-06-05 | 2009-02-03 | Sony Corporation | Method and apparatus for taking an image, method and apparatus for processing an image, and program and storage medium |
CN103843324A (zh) * | 2011-06-15 | 2014-06-04 | 梅巴菲科姆公司 | 使用倒置望远镜摄像机的视频会议系统 |
Families Citing this family (16)
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---|---|---|---|---|
FR2832282B1 (fr) * | 2001-11-12 | 2004-07-30 | France Telecom | Systeme audiovisuel modulaire avec modules concatenables pour mettre en presence une scene locale et une scene distante |
US8599239B2 (en) | 2004-04-21 | 2013-12-03 | Telepresence Technologies, Llc | Telepresence systems and methods therefore |
US7057637B2 (en) * | 2004-04-21 | 2006-06-06 | White Peter Mcduffie | Reflected backdrop for communications systems |
US8208007B2 (en) | 2004-04-21 | 2012-06-26 | Telepresence Technologies, Llc | 3-D displays and telepresence systems and methods therefore |
DE102005012132A1 (de) * | 2005-03-16 | 2006-09-28 | Valenzuela, Carlos Alberto, Dr.-Ing. | Anordnung zur Durchführung einer Videokonferenz |
US20090195645A1 (en) * | 2006-05-25 | 2009-08-06 | I2Ic Corporation | System of displaying and capturing images using non-planar mirrors |
US8154578B2 (en) * | 2007-05-31 | 2012-04-10 | Eastman Kodak Company | Multi-camera residential communication system |
US8253770B2 (en) * | 2007-05-31 | 2012-08-28 | Eastman Kodak Company | Residential video communication system |
US8063929B2 (en) * | 2007-05-31 | 2011-11-22 | Eastman Kodak Company | Managing scene transitions for video communication |
US8159519B2 (en) * | 2007-05-31 | 2012-04-17 | Eastman Kodak Company | Personal controls for personal video communications |
US8154583B2 (en) * | 2007-05-31 | 2012-04-10 | Eastman Kodak Company | Eye gazing imaging for video communications |
DE102008027393A1 (de) * | 2008-06-06 | 2009-12-10 | Isra Vision Ag | Optische Überwachungseinrichtung |
US20120038738A1 (en) * | 2010-08-12 | 2012-02-16 | Alcatel-Lucent Usa, Incorporated | Gaze correcting apparatus, a method of videoconferencing and a videoconferencing system |
US8421844B2 (en) | 2010-08-13 | 2013-04-16 | Alcatel Lucent | Apparatus for correcting gaze, a method of videoconferencing and a system therefor |
US20150228247A1 (en) * | 2012-07-20 | 2015-08-13 | Feng-Chia Wu | Image generating method |
US9628754B2 (en) | 2015-04-02 | 2017-04-18 | Telepresence Technologies, Llc | TelePresence architectural systems and methods therefore |
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FR2818860B1 (fr) * | 2000-12-22 | 2004-01-16 | France Telecom | Systeme interactif audiovisuel comprenant plusieurs dispositif de prise de vue |
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FR2832282B1 (fr) * | 2001-11-12 | 2004-07-30 | France Telecom | Systeme audiovisuel modulaire avec modules concatenables pour mettre en presence une scene locale et une scene distante |
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- 2000-09-15 FR FR0011773A patent/FR2814309B1/fr not_active Expired - Fee Related
-
2001
- 2001-09-14 US US10/380,684 patent/US7048386B2/en not_active Expired - Fee Related
- 2001-09-14 JP JP2002527207A patent/JP2004509530A/ja active Pending
- 2001-09-14 WO PCT/FR2001/002874 patent/WO2002023902A1/fr not_active Application Discontinuation
- 2001-09-14 KR KR10-2003-7003828A patent/KR20030061804A/ko not_active Application Discontinuation
- 2001-09-14 EP EP01972157A patent/EP1317854A1/fr not_active Withdrawn
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US4890314A (en) * | 1988-08-26 | 1989-12-26 | Bell Communications Research, Inc. | Teleconference facility with high resolution video display |
EP0532928A1 (fr) * | 1991-09-10 | 1993-03-24 | Alcatel SEL Aktiengesellschaft | Appareil de communication d'images |
US5890787A (en) * | 1996-02-16 | 1999-04-06 | Videotronic Systems | Desktop large image and eye-contact projection display |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003101101A1 (fr) * | 2002-05-28 | 2003-12-04 | Seos Limited | Appareil terminal pour videoconference, avec un miroir incurve assurant une transmission partielle |
GB2394379A (en) * | 2002-05-28 | 2004-04-21 | Seos Ltd | Video conferencing terminal apparatus with part-transmissive curved mirror |
US7486325B2 (en) | 2002-06-05 | 2009-02-03 | Sony Corporation | Method and apparatus for taking an image, method and apparatus for processing an image, and program and storage medium |
FR2841420A1 (fr) * | 2002-06-25 | 2003-12-26 | France Telecom | Systeme audiovisuel pour l'etablissement d'une communication bidirectionnelle entre une premiere scene et une deuxieme scene |
WO2004002152A1 (fr) * | 2002-06-25 | 2003-12-31 | France Telecom | Systeme audiovisuel pour l'etablissement d'ine communication bidirectionnelle entre une premiere scene et une deuxieme scene |
WO2004008686A1 (fr) * | 2002-07-10 | 2004-01-22 | Lg Electronics Inc. | Systeme de commande a distance d'un reseau domestique |
KR100830940B1 (ko) * | 2002-07-10 | 2008-05-20 | 엘지전자 주식회사 | 유피엔피(UPnP)를 이용한 홈 네트워크의 원격 제어시스템 |
FR2848762A1 (fr) * | 2002-12-13 | 2004-06-18 | France Telecom | Systeme audiovisuel interactif |
WO2004064399A1 (fr) * | 2002-12-13 | 2004-07-29 | France Telecom | Systeme interactif audiovisuel |
CN103843324A (zh) * | 2011-06-15 | 2014-06-04 | 梅巴菲科姆公司 | 使用倒置望远镜摄像机的视频会议系统 |
CN103843324B (zh) * | 2011-06-15 | 2017-03-15 | 泰莱奥飞斯菲科姆公司 | 使用倒置望远镜摄像机的视频会议系统 |
Also Published As
Publication number | Publication date |
---|---|
US7048386B2 (en) | 2006-05-23 |
JP2004509530A (ja) | 2004-03-25 |
FR2814309A1 (fr) | 2002-03-22 |
FR2814309B1 (fr) | 2002-10-25 |
KR20030061804A (ko) | 2003-07-22 |
US20050099605A1 (en) | 2005-05-12 |
EP1317854A1 (fr) | 2003-06-11 |
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