KR20050016604A - System for bidirectional audio and video recording and reproduction - Google Patents

Abstract

The present invention relates to a system for recording and playing back bidirectional audio and video between at least two locations. The system comprises at least one individual television camera 7, 8, 9, 10; 25 and a corresponding screen in addition to data transmission lines or transmitters and receivers. The screen, which may be configured as translucent projection screen 3 or belt 21, comprises at least one gap 4, 24 which acts as a view for the television cameras 7, 8, 9, 10; 25 or Have a break The projected image is partially hidden due to the television cameras 7, 8, 9, 10; 25. The gaps 4, 25 and the screen, in particular the projection screen 3, can be laterally displaced with respect to the gaps 4, 24. The television cameras 7, 8, 9, 10; 25 constitute images by scanning through the rotation gap 4, 24, and the projectors 11, 12, 13, 14; 28 rotate the projection screen. In order to simultaneously project the fixed images on (3), the television cameras 7, 8, 9, 10; 25 and the projectors 11, 12, 13, 14; 28 are installed in the rotating cylinder 20 in a fixed manner.

Description

System for bidirectional audio and video recording and reproduction

The invention comprises at least two television cameras and at least one display screen, preferably a projection screen made of a light-transmissive projection wall or photodiode, preferably as image points. A system for recording and playing back two-way audio and video between places.

In connection with the present invention, televisions are known together with picture telephony. In a conferencing set up, the parties who attended the meeting, although spatially separated, can see and talk to each other. For this purpose, it is common for video telephone devices to have one monitor as one playback device for displaying images from a television camera at a remote pick-up location. During the discussion, each participant looks at the display screen. However, his appearance is picked up by one camera mounted above, below, or on the side of the display screen. As a result, the participants in the conversation do not face each other. This image transmission is the transmission of a lifeless image.

There are known systems in which an image is projected from below on a display screen tilted at 45 degrees equal to the angle of the stage. The camera is placed at eye level behind the image screen. This allows pickup and playback of the image to be realized in an in-line manner, with the image and pickup flowing into one another. However, the inclined orientation of the plate forming the display screen requires additional spacing from the person, which is undesirable.

In US Pat. No. 4,928,301, one video conference is described in which pickup and projection of an image are made by a mirror. The device is fitted in front of the viewer with a liquid crystal screen which switches between a glass-clear or transparent state and a bluish, frosty or opaque state. do. While the screen is transparent, the camera is operated to pick up one image through the screen without interference. The next moment one image is projected onto the opaque image screen. Thus, the screen moves from the translucent state to the transparent state in an electrical rather than mechanical manner.

Embodiments of the invention are schematically illustrated in the drawings. 1 is a view of the system according to the invention from the inside; 2 is a cross-sectional view taken along the line II-II of FIG. 1, FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1, and FIG. 4 is taken at a specific moment in the system of the present invention with one projection image from a remote system. FIG. 5 shows the basic principle of a configuration other than the circular cylinder shape.

The accompanying drawings show a system consisting of a pickup (image capture) and a reproduction station with television cameras and an image screen projector, at least with other systems or devices by communication lines, terrestrial radio transmission or satellite communication. The basic principle of a system connectable in one second is shown. The television cameras and transmitters of the two videoconferencing devices in communication, for example, transmit each image of immediate surroundings to another videoconferencing device for playback. Sound is also transmitted in both directions at the same time. To this end, each videoconferencing device may be arranged between each passers-by in an open arrangement of the system or videoconferencing device of the present invention in a different position, even though the passengers of each videoconferencing device are spaced apart. As a video call for communication or for a participant of a two-way conversation, it plays a role such that the conversation partner or each passer-by wants to talk to each other through the system of the present invention. Apart from the actual communication of the size of the image, the system of the present invention allows subjects to be in close proximity, resulting in enabling people to see each other in spite of being in remote locations. Provides pickup and playback of the same image.

It is an object of the present invention to provide a state in which the users face each other by the effect of facing each other to the maximum extent possible. This object is at least one in which an image screen, preferably a projection wall or screen, provides a free throughgoing optical passage to one television camera that shields the projected image or lacks a light diode (LED). Made with a gap, which is achieved by enabling transverse movement in the longitudinal direction thereof in order to pick up the perfect image to the television camera via pickup or reception with the projection wall, and thus projection or reproduction The image appears stationary in the movable projection wall, and the transit speed of the gap exceeds the detection limit of the human eye. Thus, an image transmitted from a remote video station appears stationary on a circulatingly movable fabric screen or projection surface, while no smaller projection screen appears. The gap continues to move past the observer, through which the image of the user is scanned by a camera (television camera) and subsequently trained to a viewer that transmits the image to a remote videoconferencing device. ). As a result, playback and pickup between the two videoconferencing devices flow into each other so that jitter is not seen due to the speed of movement of the gap through such multiple gaps. These cameras are at eye level. As a result, near actual reproduction is obtained. In both videoconferencing devices, the screen can be made immediately accessible so that the hand can lie flat on a stationary transparent jacket that surrounds the rotating image screen, thereby allowing the opposite use and It can give you a face-to-face look.

For example, when a television camera is raised to a fixed position inside a circular cylinder to cover four quadrants and its tip is adjacent to the optics of the television cameras and rotates around with the projection wall. When radial shading walls are installed in the gaps to form a reception shaft that is possibly driven, the transparent (with slits) along the gaps or openings (slits) of each of the correct circular cylinders ( It has the advantage of providing a projection wall to the surface of a vertical circular cylinder which is spaced apart from glass-clear zones. Cylindrical configurations can be installed in open spaces in remote Vienna and Munich. The two videoconferencing devices each transmit a single panoramic image of their surroundings, using microphones and loudspeakers made of units, where people talk to each other and gaze at each other. Can be encountered. The diameter of the screen may be 3 to 6 meters, more preferably 8 meters. No wonder the rotating screen is wrapped in a fixed cylinder of transparent material. Television cameras can be installed in a light blocking casing that rotates with the projection wall, which has a single light incident zone [for each camera] radially relative to the water or pickup shaft, thereby conferencing video conferencing without mutual interference. Ensure complete optical separation of pickup and projection from inside the device. This enables time multiplex arrangements of image reproduction in a common viewing field followed by subsequent pick up.

Another embodiment consists of a transparent flexible belt in which the projection wall moves over rerouters such as rerouting rollers and provides free optical access of the television camera across the direction of travel. And a synchronously rotating diaphragm or shutter having a gap or slit for covering and covering the projection surface of the projector for pickup by the television camera is installed immediately adjacent to the television camera. In this way, straight image surfaces, for example with flat images, in particular flat panorama images, can also be produced without limitation on their length. Moreover, a circularly cylindrical transparent wall is movable and a gap has been made for a television camera that is located outside of the screen as well, so that it is possible to project images from the outside. While standing inside the circular cylinder, the user can feel like talking face to face with people projecting as they pass by in another city.

Each embodiment according to EP 0 704 135 B1 or 0 454 244 B1 can be used as an image screen. Because of the round construction in the embodiment, the image sharpness of the projection is particularly good (the sharpness is uniform throughout the entire image).

Best Mode of Invention

For this purpose, in one transparent glass-clear fixed plastic cylinder 1, a second rotary drive circular cylinder 2 is installed, the outer surface of which is a light-transmissive projection wall 3 (Fig. A gap 4 is formed, which is composed of segments as 2, 3, and is translucent and transparent along various generatrices of the circular cylinder surface 2. A radial pick up shaft 5 is radially inwardly connected to the gaps 4, four of which are shown and may be more than this (eg 32). These four pickup shafts 5 shown in FIGS. 1 to 3 rotate together with the circular cylinder 2. The pickup shafts 5 open with one central casing 6 rotating with them, in which four television cameras 7, 8, 9, 10 are fixedly mounted. . The television camera 7 has one pick up objective or one image angle with an angle of view of 90 degrees (given as an example for understanding of the present invention), but the pickup shaft 5 It captures only image segments that can be obtained through. The casing 6 and each pickup shaft 5 are blocked off in a light-tight manner from the radial passage on or on its side. The cameras 7, 8, 9, 10 are fixed while all the components mentioned above rotate. As a result, the camera 7 scans one image as a result of the angular movement of the gap 5 within a camera angle of 90 degrees and within a short time corresponding to the rotational speed of the circular cylinder 2. This image is then transmitted to a receiver of a projector such as projector 11 of FIG. 3 of a counterpart video station of the same configuration. Therefore, the projector 11 receives the image scanned by the gap of the camera of the videoconferencing apparatus corresponding to the camera 7 of FIG.

In Fig. 3, the projector 11 is positioned within a 90 degree angle so that it can be transmitted from the other party's video conferencing device to produce a 360 degree panoramic image by the projectors 11, 12, 13 and 14 of the video conferencing device. Project the image. The projectors 11 to 14 are fixed at the same position as the immediately adjacent cameras 7 to 10. A projection of the panoramic image generated in the rotating projection wall by the projectors can be visually seen. The width of the gaps 4, as well as their rotational speed and the ratio of the gap area to the projection area, reveal the speed of passage of the gap 4 through the user even when more than four, for example 32 gaps are formed. It is chosen not to.

In FIG. 4, this display represents one moment during operation of the system of the present invention, where the gap 4 is visible to the naked eye as if the screen is momentarily freezing and thereby the camera 7 behind the gap. Takes a picture of a strip of the surroundings. As the circular cylinder 2 rotates, the display of the projection image visible to the user does not change due to the rotation. The passing speed of the gap 5 is above the detection limit of the human eye. The cameras 7, 8, 9 produce perfect images within the unit time of slit movement through the camera's viewing angle and send them to the projector of the other videoconferencing device.

Based on the system of each videoconferencing device shown in Figs. 1 and 4, motors 15 rotatably driving the respective circular cylinders to rotate the alternating projection walls 3 and the gaps 4 are provided. This is installed. The speed can be fast enough that the gap 4 is invisible.

In FIG. 5 a flexible belt 21 is installed which moves around the rerouting rollers 20, where an alternative embodiment is shown from the circular cylinder 2 above, in which the projection walls 23 which are completely transparent zones. A gap or slit 24 is formed at a spaced apart position between the transparent zones forming (). One television camera 25 is installed in the belt behind one shutter 26 which moves simultaneously with the belt 21. The gap 24 and shutter opening 27 register with each other and cover the image of the projector 28 projected onto the belt 21 for the optics of the camera 25. The television camera 25 is shielded up and down against stray light from the projection.

The embodiment of FIG. 5 provides a limited planar image as compared to the 360 degree panoramic image of FIGS. Display screens from flat surfaces to slightly bulging or any other curvatures can be made to the desired length, providing each other with a larger display screen form without intervening spacing.

Circulating displays, which use diode-based or liquid-crystal-based imaging instead of projections, can also display image information directly from the camera of the other party's video conferencing device. It can be used with such multiplexing software that can be obtained.

By placing the optics of the cameras 7 to 10 such that the images are captured by the camera at substantially the eye level of the person, distortion-free and like humans actually touching in this kind of virtual system and It can provide a realistic impression. The system of the present invention may use a configuration that includes image monitors, video conferencing systems and larger image projectors.

Claims (4)

A system for recording and reproducing bidirectional audio and video between at least two locations, having at least one television camera and at least one display screen, preferably a projection screen made of transparent projection wall or photodiodes as image points. , The image screen, preferably the projection wall 3, provides free light to the television cameras 7, 8, 9, 10; 25, in which the projected image thereon is not visible or there is no photodiode or the like. Has at least one gap providing a free viewing path, The gaps 4, 24 are projected laterally or longitudinally to pick up the perfect image within the framework of the reception angles of the television cameras 7, 8, 9, 10; 25. A system for recording and reproducing bidirectional audio and video between at least two locations, characterized in that it is movable laterally with the wall (3). 2. An optical circular cylinder (2) according to claim 1, having glass clear zones or openings along each of the generatrices of the circular cylinder (2) with a space in the gap (4). A surface of is formed as the projection wall 3; Television cameras 7, 8, 9, 10 for four quadrants, for example, are fixedly installed inside the circular cylinder 2; Defining pickup shafts, which are driven near the optics for the television cameras 7, 8, 9, 10 and driven together with the projection wall 3 in one circular passageway. A system of recording and reproducing bidirectional audio and video between at least two locations, characterized by the limitation of the gap (4) by radial light-tight walls. 3. The projection walls according to claim 2, wherein the television cameras 7, 8, 9, 10 are connected to the pickup shafts 5 extending in the radial direction as a single light-admission region. A system for recording and reproducing bidirectional audio and video between at least two places, characterized by being surrounded by a light-tight casing (6) rotating together with (3). The transverse slits or gaps according to claim 1, wherein the projection wall (3) moves around rerouting rollers (20) and the television camera (25) is free to take pictures. 24 is made of a flexible light-transmissive belt formed, and one synchronously traveling shutter 26 is used to capture the image of the television camera 25. Recording and playback of bidirectional audio and video between at least two locations, characterized by being installed directly adjacent to and shielding the projection surface 23 of the projector 28 for image capture by the camera 25 system.