KR20020014066A - Dynamic And Stereo Imaging System - Google Patents

Abstract

PURPOSE: A dynamic stereo imaging system is provided to offer an animate image by changing the position of an image in a real or virtual imaging system and restraining the generation of a ghost image. CONSTITUTION: A dynamic stereo imaging system comprises a video source(100) for projecting an image from the beginning point to the terminal of an optical path, a spherical surface concave mirror, a beam splitter inclined in 45 angular degrees on the optical path between the video source and the mirror, a projecting distance changing unit, a circular polarizing unit placed in between the beam splitter and the mirror to circularly polarize the beam, and a linear polarizing unit placed in between the beginning point and the terminal of the optical path to linearly polarize the beam. The focus distance(a,b) of the image protruded from the system is changed by the intention of an observer or by a predetermined program. Therefore, an animate image is created. Without a ghost image, the quality of the image is improved.

Description

Dynamic And Stereo Imaging System

The present invention relates to a stereoscopic projection virtual image or a real image system imparting three-dimensional motion, and more particularly, to provide a configuration capable of imparting motion to the projected image by a change in position of an image source of the stereoscopic projection image system. The present invention relates to a system for preventing the formation of ghost images to provide a clearer image.

Modern stereoscopic projection systems are required to provide an image that is clear, distorted and of good contrast to the viewer. In addition to this necessity, a three-dimensional change is required to provide a more realistic and lively image.

The stereoscopic projection system provides a three-dimensional image in the air protruding from the system, and thus has a very lively and attention-grabbing effect compared to providing a two-dimensional image on a conventional screen or monitor (CRT, LCD, etc.). . Screens and monitors use perspective to induce three-dimensional appearance by the observer. However, there is a limit in expressing an object or a video because it is different from the facts. As a way to solve this problem, a method of inducing an observer to look at a screen or a monitor and feel a three-dimensional effect by wearing a special device or apparatus has been developed and used. However, the use of a special device or apparatus itself is very inconvenient and does not solve the fatigue caused by long observations when looking at the screen or monitor.

On the other hand, three-dimensional projection image systems generally use a window mirror in the front of the system in which the image is projected and use a curved mirror in the interior of the apparatus. One of the main problems in providing a clear image is that the externally projected exterior of the system is Light source and / or background image (hereinafter referred to as " external light ") form an additional ghost image near the focal point of the image projected and observed from the system.

Accordingly, an object of the present invention is to solve the problems of the prior art and to solve the technical problems that have been requested from the past. Specifically, an object of the present invention is to provide a system that is more lively and compatible with an observer by causing a change in the position of a projected image in an imaging system that gives a stereoscopic virtual image or a real image. In addition, another object of the present invention is to provide a system that provides a clearer image by suppressing generation of ghost images by external light, which is a problem in the conventional imaging system.

1 is a schematic structural diagram of a conventional stereoscopic projection system;

2 is a structural diagram showing an embodiment according to the vertical position change of the image source in the present invention;

3 and 4 are structural views showing an embodiment according to the horizontal position change of the image source in the present invention;

5 to 8 are structural diagrams showing different embodiments of inducing a change in position of an image source in the present invention;

9A-9D are internal structural diagrams of embodiments of a system for preventing ghost phase in the present invention;

10A to 10D are internal structural diagrams according to another embodiment of the system for preventing ghost phase in the present invention.

To achieve this object, the present invention is directed to an image source for projecting an image from (a) the beginning of the optical path to the end of the optical path where the image is visible, (b) a spherical concave mirror, (c) an optical path between the image source and the mirror. A Real or Virtual Imaging System comprising a beam splitter inclined at about 45 degrees positioned, wherein (d) comprises a configuration that causes a change in the front and rear projection distances on the stereoscopic projection image.

In general, a stereoscopic projection or real image system (hereinafter referred to as a “stereoscopic image system”) is inclined at about 45 degrees by the light of the image source 100 installed at the bottom or top of the system, as shown in FIG. Projected onto the beam splitter 200, and some light transmitted through the beam splitter 200 is reflected by the spherical concave mirror 300, and then partially reflected by the beam splitter 200 to protrude in front of the system. The image 101 is formed. In addition, a background image source 120 for creating a background image is installed in the system so that it can be transmitted through the beam splitter 200 or reflected from the beam splitter 200 to be displayed on the rear surface of the stereoscopic projection image 101. The image source and the image source of the background source are controlled by an image supply / control device 400 such as a computer. The image source and the background source can be configured in various ways according to the position of the image elements such as the beam splitter and the mirror. As a result of the appearance of the image, the background image is perceived to exist inside the system and the stereoscopic projection image is present at the position protruding into the system.

Since the position of the stereoscopic projection image depends on the focal point or radius of the spherical concave mirror, the projection position of the stereoscopic projection image is fixed unless the focal point or radius of the spherical concave mirror is changed. Thus, the changing image in the image source is fixedly represented at the projection position at a constant position. The inventors found that such a change in the projection position can be induced by changing the size (width) of the light projected onto the spherical concave mirror, and adding a configuration to the stereoscopic image system that can induce a change in the position of the image source. Dynamic change is applied to the projected stereoscopic image.

As an example of a method of providing a change in position of an image source, any one of the following methods may be selected.

First, a method of vertically changing the position of an image source at the top or bottom of a stereoscopic image system.

Second, a separate mirror is installed at a position corresponding to the beam splitter, and the image source of light projected on the mirror is horizontally changed.

An example of the vertical position change method is shown in FIG. 2, when the image source 100 is located close to a beam splitter (not shown) in the upper part of the system, a focal point b for determining a stereoscopic projection image is If it is longer and located far from the beam splitter, the focal point a becomes shorter.

An example of the horizontal position change method is shown in FIG. 3, which places a mirror 500 of about 45 degrees at a position corresponding to a beam splitter in the system and horizontally changes the position of the image source 100. The focal point a that determines the position of the stereoscopic projection image is long when the image source 100 is located close to the mirror 500 and short when it is located far away. Here, the mirror 500 preferably uses a flat mirror.

Another example of the horizontal position change method is shown in FIG. 4, which is different from the system of FIG. 3 in that the position of the stereoscopic projection image and the position of the image source are perpendicular to each other.

Various methods may be used to induce the positional change of the abnormal image source. For example, any one of the following methods may be selected.

First, a method of transmitting a control signal for changing the position of an image source through a control box connected to the system.

Secondly, a method for transmitting a control signal for changing a position of an image source from a signal transmitter of a remote control and receiving it from a signal receiver on a system.

Third, an optical sensor for detecting the position of an observer located in front of the system in which the stereoscopic image is projected is installed in the front of the system and the control signal is generated by the system.

Fourth, a method for automatically processing the positional change of an image source by a program embedded in a computer system.

One embodiment of the first method is shown in FIG. 5, in which the control box 600 is directly connected to the system or connected in a wired manner. One embodiment of the second method using the remote control 700 is shown in FIG. 6, and one embodiment of the third method using the optical sensor 800 is shown in FIG. 7. The fourth method using a program of a computer system is a concept including changing the position of a programmed image source according to the contents of an image to cause a more dynamic change. FIG. 8 schematically illustrates a configuration in which a period is given to a change in position of an image source to cause a change in position in a stereoscopic projection.

The driving for changing the position of the image source can be performed by a known method using an electric motor or the like.

Means required for the construction of the method may be selectively cooked in a number of methods known in the art without separate description.

The present invention also relates to preventing the occurrence of ghost images by external light in addition to the positional change of the three-dimensional projection image. Specifically, the imaging system may further include the following configuration.

(e) circular polarization means for circularly polarizing the light beam, located in the optical path between the beam splitter and the mirror;

(f) Linearly polarized means for linearly polarizing light, located in an optical path between the end of the optical path to be visualized and the beam splitter.

By the addition of the above configuration, the external light incident on the system of the present invention is almost blocked before exiting the system, thereby almost eliminating the formation of the ghost image caused from the external light source.

Preferably, the circular polarization means is a quarter wave plate. Thus, one of the main constructions of the present invention for extinction of ghosts is to place a quarter wave plate between the beam splitter and the mirror, thereby keeping the circular polarization of the external light between the quarter wave plate and the mirror. To prevent the elliptic component from being introduced.

More preferably, the configuration includes a quarter wave plate behind the beam splitter inclined at about 45 degrees, in which case the external light incident on the system and linearly polarized by the linear polarization means on the projection sphere is light of a different orientation. For example, the beam splitter more effectively reflects up and out of the system as compared to unpolarized, circularly polarized or elliptically polarized light. This reduces the brightness of external light in the image forming system and further contributes to the reduction of ghost image formation.

In the prior art, since the linear polarizer and the quarter wave plate are positioned between the ends of the optical path and the beam splitter, the unpolarized light is changed to, for example, horizontal polarization in the linear polarizer and circularly polarized in the quarter wave plate. The beam splitter is inclined at an angle other than a right angle, for example about 45 degrees, and when circularly polarized light passes through the substrate, an elliptical polarization component is introduced and becomes an elliptical polarized light, which is reflected by a mirror. As a result of being distorted while going through the beam splitter, the ghost image is formed without being completely filtered even though the linear polarizer is passed.

On the other hand, in the present invention, the external light introduced into the system is horizontally polarized, for example, by linear polarization means, maintains horizontal polarization even through the beam splitter, and is circularly polarized while passing through the circular polarization means. When the right polarized light is reflected by the mirror, the left polarized light is changed to the left polarized light, and the polarized light is vertically polarized through the circular polarization means, and the vertical polarized light is maintained even through the beam splitter and completely blocked by the linear polarized light means. Therefore, external light applied to the system does not produce a ghost image.

Hereinafter, the contents of the present invention will be described in more detail with reference to the examples of FIGS. 9 and 10, but the scope of the present invention is not limited to the following contents.

The stereoscopic projection image system 900 of FIGS. 9A-9D includes an image source 100 formed by a cathode ray tube or light emitter and projected as a monochromatic, black and white or color light beam 103. Image source 100 is any that reflects, transmits, or emits light. The light beam 103 partially passes through or is reflected by the beam splitter 200 inclined at a 50:50 ratio, which is indicated for the 50% transmission / 50% reflection (50T / 50R) type beam splitter 200. In some cases, this ratio may be other than 50T / 50R. Beam splitter 200 includes a transparent substrate 206, a beam splitter coating 208 or any partially reflective coating, and optionally an antireflective coating 210.

Since the reflected non-polarized light beam 112 passes through the quarter wave plate 114 having no influence on the light beam 112 because it is non-polarized light, it is reflected by the concave mirror 300. The quarter wave plate 114 comprises a quarter wave layer 118 and preferably a transparent substrate layer 160 on the surface of each layer 118. Each transparent substrate layer 160 is preferably coated with an antireflective layer 162. Mirror 300, which may be spherical or aspherical, includes substrate 324, mirror coating 326, and protective overcoat 328. After impinging on the mirror 300, the light beam 103 begins to converge toward the focal point determined by the radius of curvature of the mirror 300. Thereafter, the light beam 103 passes through each quarter wave plate 114, passes through a beam splitter 200 having a transmittance of 50%, and then forms a linear polarization window 130 that polarizes the light beam 103. It passes at about 10.6% of the original brightness. Light appears as horizontal polarization.

The linear polarization window 130 includes a transparent substrate 132, a linear polarizer 134, and an antireflection film 136. The anti-reflection film 136 is not reflected because the light beam 171 from the external light source 170 is scattered in the anti-reflection film 136. In some cases, the anti-reflection film 136 may be coded on the surface of the transparent substrate 132. The light beam 103 then converges to form an image 101. 9B shows the transmission as the light beam 103 passes through the system 900. 9C and 9D, the change in the external light is described as the external light beam is incident to the system 900 through the linear polarization window 130, for example, a non-polarized external light beam from which horizontal polarization is obtained. . Thereafter, the light beam passes through the beam splitter 200 while maintaining its horizontal polarization, and then passes through the quarter wave plate 114 to become a right circle ("RC"). Thereafter, the light beam is reflected from the mirror 300 to become a left circle ("LC"), passes through the quarter wave plate 114, and is then vertically polarized ("VP"). The light beam 171 passes again through the beam splitter 200 and is almost blocked by the linear polarizer 130 to prevent external light from exiting the system 900 to almost eliminate the cause of ghost formation.

Referring to FIGS. 10A-10D, the stereoscopic projection system 1000 includes a quarter wave layer 118 positioned on the beam splitter coating 208 so that the beam splitter 200 and the quarter wave plate structure ( It is arranged similarly to system 900 except for the main difference that forms the combination of 141. As shown, the quarter wave layer 118 is located on the surface 243 of the beam splitter coating 208 facing the mirror 300. FIG. 10B shows the transmittance of the imaging light passing through the system 1000 and achieves the same or nearly the same transmittance as the system 900 despite some changes in the optical path. 10C and 10D show an analysis of external light incident on the system 1000, similar to the system 900 except for some variations along the optical path due to the different relative positions of the optical elements and the window 130. External light is almost blocked before exiting, and is effective in almost eliminating the cause of ghost image formation.

The imaging systems 900 and 1000 optionally project a second image 246 (indicated by a illusion) and form a monochromatic second image 248 at or near image 101. And a second beam splitter 242 (indicated by illusion), preferably at a tilt of about 45 degrees relative to the black and white or color second light beam 244, preferably a 50T / 50R beam splitter. This additional beam splitter 242 allows the second image 248 to be projected from the other side of the image 100.

The imaging systems 900 and 1000 optionally include one or more additional monitors 150 that project one or more additional images, such as for example one or more background images. This background image appears as a virtual image located in the system. An advantage on the background is that data or a second side of the phase can be provided behind the first phase.

Those skilled in the art to which the present invention pertains may make various modifications and applications within the scope of the present invention based on the above contents.

According to the three-dimensional projection image system of the present invention, since the focal length of the projection image projecting from the system changes according to the intention of the observer or a predetermined program, it is possible to create a lively three-dimensional image, and also a ghost image due to external light is not generated. Therefore, the image quality of the projection image is very excellent.

Claims (5)

(a) an image source for projecting the image from the beginning of the optical path to the end of the optical path where the image is visible, (b) a spherical concave mirror, and (c) a beam splitter inclined at about 45 degrees located in the optical path between the image source and the mirror. A stereoscopic projection image or a real or virtual imaging system, comprising: (d) a configuration for causing a change in the front and rear projection distances of the stereoscopic projection image. 2. The method according to claim 1, wherein the change in the front-rear projection distance of the stereoscopic projection image is performed by changing the position of the image source relative to the beam splitter, and vertically changing the position of the image source in the upper or lower portion of the stereoscopic image system, or And installing a separate mirror at a position corresponding to the divider and horizontally changing the image source of the light projected on the mirror, thereby changing the position of the image source. According to claim 2, In order to induce a change in the position of the image source, the control signal for changing the position of the image source is transmitted through a control box connected to the system, or the control signal for changing the position of the image source of the remote control The optical sensor which transmits the signal from the signal transmitter and receives it from the signal receiver on the system or detects the position of the observer located in front of the system where the stereoscopic image is projected on the front of the system and generates a control signal through the system, A stereoscopic projection image system, characterized in that the positional change of an image source is automatically processed by a program embedded in a computer system. The stereoscopic projection image system according to claim 1, further comprising the following configuration to prevent the occurrence of ghost images by external light in addition to the positional change of the stereoscopic projection image. (e) circular polarization means for circularly polarizing the light beam, located in the optical path between the beam splitter and the mirror; (f) Linearly polarized means for linearly polarizing light, located in an optical path between the end of the optical path to be visualized and the beam splitter. The stereoscopic projection image system according to claim 1, wherein said circular polarizing means is a quarter wave plate.