WO2015160012A1

WO2015160012A1 - Multi-projection-type integral imaging method

Info

Publication number: WO2015160012A1
Application number: PCT/KR2014/003409
Authority: WO
Inventors: 신동학; 장재영; 이병국; 김은수
Original assignee: 광운대학교 산학협력단
Priority date: 2014-04-16
Filing date: 2014-04-18
Publication date: 2015-10-22
Also published as: KR101617514B1; KR20150120030A

Abstract

The present invention relates to a projection-type integral imaging method and, more particularly, to a multi-projection-type integral imaging method for generating a three-dimensional image by projecting, by multiple projectors, onto a convex mirror array at the same time in different locations. The multi-projection-type integral imaging method of the present invention, as described above, has remarkable effects of providing an improved viewing angle compared to a single-projection-type, having no problem of depth inversion of a reproduced image, showing no flipping phenomenon, enabling further improvement in resolution of a three-dimensional image, and the like.

Description

Multi Projection Integrated Image Method

The present invention relates to a projection integrated imaging method, and more particularly, to a multi-projection integrated imaging method characterized by generating a three-dimensional image by projecting a plurality of projectors at the same time in a convex mirror array at different positions.

The 3D integrated image is a technology capable of generating a full parallax 3D image in real space using a 2D display device under incoherent rays.

Basically, the integrated imaging method includes a process of acquiring three-dimensional information of an object and displaying the acquired image.

In the process of acquiring three-dimensional information, spatial information of the three-dimensional object is recorded in the element image through the lens array.

In the reproduction process, the 3D image is reproduced through the intersection of each ray after the ray starting with the element image passes through the lens array.

Recently, various types of projection integrated imaging systems have been studied for large TVs and movies.

The prior art for improving the performance of the integrated imaging system includes a plurality of display elements sequentially arranged on the same central axis in the Patent Publication No. 0860611 (stereoscopic imaging system using a multi-layer display device), each of the above The display elements display the base image to be applied to different center depth planes, where the center depth plane indicates an area included within a set distance based on the position at which the image displayed by the display element is in focus. ; An image processor configured to provide respective base images corresponding to the plurality of display elements; And a lens array including a plurality of elementary lenses and forming an image of each of the display elements of the multilayer image display unit on different center depth planes to display a stereoscopic image. The image processor includes: A stereoscopic imaging system is introduced that generates a corresponding number of base images according to the number of display elements constituting the multilayer image display unit.

In still another prior art, Korean Patent No. 1118745 discloses a first projector for projecting a basic image including stereoscopic image information, a second projector for projecting a two-dimensional image, a rear projection screen for displaying the basic image, and the And a pinhole screen for converting the base image displayed on the rear projection screen into a 3D image and displaying the 3D image or the 2D image, wherein the first 2D image is lost by the pinhole array. The projector discloses an image display system for projecting a lost two-dimensional image to the basic image area of the rear projection screen positioned behind the pinhole screen.

In addition, a single projection type integrated imaging system using a convex mirror array has been proposed.

The single projection integrated imaging system provides an improved viewing angle, there is no problem of depth inversion of the reproduced image, and no flipping phenomenon occurs.

Although this convex mirror based single projection integrated imaging system has many advantages, the high resolution three dimensional image can be produced because the resolution of the reproduced three dimensional image is proportional to the total number of individual convex mirrors in the convex mirror array used for display. The disadvantage is that it is difficult to grow up.

That is, the observer observes only one imaging point through each convex mirror of the convex mirror array.

In addition, the conventional convex mirror-based single projection type integrated imaging method requires a low magnification relay optical system for matching pixels between element images and convex mirror arrays in a smaller area, which makes it difficult to use a commercial projector.

The present invention has introduced a multi-projection to overcome the disadvantage that the resolution of the conventional projection integrated image is limited in proportion to the number of individual convex mirrors by using the multi-projection to solve the above problems.

According to the present invention, a projection integrated imaging method generates a high-resolution three-dimensional image by projecting multiple projectors onto a convex mirror array at different locations simultaneously.

As described above, the multi-projection integrated imaging method of the present invention provides an improved viewing angle compared to the single projection type, there is no problem of depth inversion of the reproduced image, no flipping phenomenon, and further improved resolution of the 3D image. There is a remarkable effect such that a commercially available projector can be used immediately.

1 is a schematic diagram of a multi-projection system of the present invention;

2 is a schematic diagram showing the geometric relationship between the openings of the present invention multi-projection system and the imaging points of the openings formed in the block mirror arrangement.

Figure 3 is a schematic diagram showing the relationship between the present invention multi-projection system and the aperture image point.

4 is a graph showing a distance relationship between aperture image points.

Figure 5 is an image showing the results of the present invention multi-projection system and optical experiment.

6 is a comparative image of a three-dimensional image optically reproduced by a single multi-projection type system and a multi-projection type system.

7 is a three-dimensional image image reproduced by the multi-projection integrated image method of the present invention.

100. Convex mirror array 200. Projector

In the multi-projection integrated imaging method of the present invention, a plurality of projectors 200 generate three-dimensional images by simultaneously projecting the convex mirror array 100 at different positions.

The geometric relationship between the opening of the projector 200 and the imaging point of the opening formed by the nth convex mirror of the convex mirror array 100 is

To follow.

In addition, the distance between the opening image points formed in each convex mirror constituting the convex mirror array 100 is

To follow.

Hereinafter, the present invention will be described in detail with reference to the attached multi-projection integrated imaging method.

1 is a schematic diagram of a multi-projection type system of the present invention.

As shown in FIG. 1, the multi-projection integrated imaging method of the present invention is characterized by generating a three-dimensional image by projecting a plurality of projectors 200 onto the same convex mirror array 100 simultaneously at different positions.

That is, a plurality of projectors 200 are installed at a predetermined distance from the front of the convex mirror array 100 arranged in the diameter of the same size, and the light beams in the convex mirror array 100 through the projector 200 By projecting the 3D image is displayed between the convex mirror array 100 and the projector 200.

On the other hand, the projector 200 is configured to be movable in front, rear, left and right and up and down.

That is, the projector 200 may move left and right on the left and right guide rails placed left and right, and the left and right guide rails may move vertically along the vertical guide rail, and the vertical guide rails may be arranged on the front and rear guide rails. When the 3D image is displayed by being able to move forward and backward in the (100) direction, the position of the displayed image can be adjusted.

The left and right guide rails, the vertical guide rails, and the front and rear guide rails may be installed by changing the coupling relationship according to circumstances.

In the present invention, multiple projections are simultaneously projected onto the same convex mirror array 100.

Compared to the conventional single projection type integrated image using the convex mirror array 100, the present invention uses the cod convex mirror array 100.

This has the advantage that the commercial projector 200 can be used without adjustments or additional relay optics.

Accordingly, as shown in FIG. 1, the element images corresponding to the projectors 200 are projected onto the convex mirror array, and the observer may observe the 3D image displayed through the convex mirror array 100.

Fig. 2 is a schematic diagram showing the geometric relationship between the openings of the present invention multi-projection system and the imaging points of the openings formed in the block mirror arrangement.

As shown in FIG. 2, the element image array is projected onto the convex mirror array 100 through the projection system. In the present invention, it is assumed that the opening of the projection system is a pinhole to simplify the analysis.

Under this assumption, the geometric relationship between the opening of the projector 200 and the imaging point of the opening formed by the n-th convex mirror of the convex mirror array 100 is given by the following equation (1).

(One)

At this time, the point ( z _p , x _p ) is the coordinate of the projection system, P is the diameter of the element convex mirror and at the same time the optical center point distance between the neighboring element convex mirror, f is the focal length of the element convex mirror.

For convenience, individual convex mirrors are sometimes referred to as element convex mirrors.

x _Ipn is the x-axis coordinate of the aperture image point (AIP) and has a valid value within ( n- 1) P = x _Ipn = nP , where n is a _natural number.

Further, the z-axis coordinates of the aperture image point (opening image point (AIP)) are given by the Gaussian formula as follows.

(2)

From equations (1) and (2), the nth element convex mirror false image point of the coordinate system ( z _p , x _p ) of the projection system is ( z _Ip , x _Ipn ).

Therefore, when a plurality of projection systems are placed at different positions, the number of aperture image points (opening image points AIP) increases in proportion to the number of projection systems used.

As shown in FIG. 3, in the projection integrated imaging system, the projection system and the aperture image point (AIP) are incident pupils and exit pupils, respectively, and each element convex mirror serves as an exit window and an exit window.

In a projection integrated imaging system, the angle of spread can be calculated using the coordinates of the aperture image point (AIP), which is given by the angle formed by the coordinates of the aperture image point (AIP) and the edge of the exit window.

Also, the observation area is given by the intersection of the spread angles.

Assuming that the distance between the projection system and the convex mirror array is far enough, x _Ipn . As indicated by z _Ip in Eq. (2), the position of the aperture image point (AIP) approaches the optical axis and focal length of each elemental convex mirror.

3A illustrates a single projection type integrated image. In this case, the observer may observe only one aperture image point AIP through each element convex mirror in the observation area.

3 (b) is for the multi-projection integrated image method, and considers the case where two projection systems are used as shown in FIG. 3, which can be easily extended to the general case of the multi-projection integrated image. .

That is, by using the n projectors 200 extended than the two projectors 200 it is possible to generate a three-dimensional image of a further improved image quality.

As shown in FIG. 3 (b), two projection systems

Assuming a distance apart, the observer can observe two aperture image points (AIP) through each convex mirror.

Shown in FIG. 3 (b)

Wow

Calculation can be expressed using Equation (1) as follows.

(3)

here,

Is the distance between the projection systems,

Is the distance between the opening image points formed in one element convex mirror.

As the distance between projections changes from Equation (3), it can be seen that the aperture image point also changes linearly in proportion thereto.

4 is a graph illustrating a distance relationship between aperture image points.

Projection system

And the change of the distance between the convex mirror array 100 and the distance between the projection system ZP of the aperture image point (opening image point (AIP)).

Looking at the change in the distance between the graphs as shown in FIG.

Thus, as shown in FIG. 4, the focal length of the elementary convex mirror is f = −7.47 mm.

Is 200 mm, ZP 800 mm

Is 1.85 mm.

This means that the observer sees two aperture image points (AIP) separated by 1.85 millimeters through an elementary convex mirror.

5 is an image showing the results of the multi-projection system and the optical experiment of the present invention.

In order to confirm the theoretical analysis, optical experiments on the multi-projection integrated imaging method were performed as shown in FIG. 5.

5 (a) shows a projection system configuration.

In the experiment of the multi-projection integrated imaging method, the distance between the convex mirror and the projection system is 800 mm, and a 2 × 2 projector 200 is used.

As shown in FIG. 5 (a), the distance between each projector 200 was set to 200 mm, and the total number of element convex mirrors in the convex mirror shown in FIG. 5 (b) was 90 × 50, and the convex mirror array 100 ), The overall size is 373.5mm wide 680mm long.

In the experiment, 50 × 50 elemental convex mirrors of the entire convex mirror array 100 were used.

The focal length and diameter of the elemental convex mirrors are -7.47mm and 7.47mm, respectively.

Figure 5 (c) shows an example of one of the element image array used in the experiment.

5 (d) is a diagram showing an example of a playback image photographed under white light.

6 is a comparative image of a 3D image optically reproduced by a single multi-projection type system and a multi-projection type system, and FIGS. 6 (a) and 6 (b) respectively show a single projection type image and a multi-projection type image. The image is used to show an optically reproduced three-dimensional image.

The aperture image point (AIP) of each projection system can be observed in the right magnified image of FIG. 6.

As discussed above, the resolution of the 3D image reproduced in the conventional single projection type integrated imaging method is equal to the number of element convex mirror arrays as shown in FIG.

Therefore, the resolution of the single-projection integrated image in this experiment is 50 × 50 pixels.

The reconstructed image in the limited multi-projection integrated imaging method is shown in FIG. 6 (b).

Here, we can observe the increased number of aperture image points (AIP) using several projection systems.

Multi-projection integrated image resolution increases in proportion to the number of projection systems as shown in FIG.

Since the experiment uses a 2 × 2 projector 200, the resolution of the multi-projection integrated image is 100 × 100 pixels.

7 is a 3D image image reproduced by the multi-projection integrated imaging method of the present invention.

FIG. 7 is a three-dimensional image reproduced by the multi-projection integrated imaging method, and shows an optically reproduced three-dimensional image observed from three viewpoints of left, center, and right.

The proposed multi-projection integrated image was analyzed using geometric relations and optical experiments were performed to explain its validity.

Experimental results demonstrate that the proposed multi-projection integrated imaging method can improve the resolution of 3D images using the commercialized projector 200.

In conclusion, the present invention proposes a projection-type integrated image technology that can increase the resolution of a reproduced image using a multi-projection system, and multi-projection can increase the number of apertured image points (AIP) observed by an observer. Therefore, the resolution of the 3D image can be increased.

As described above, the multi-projection integrated imaging method of the present invention provides an improved viewing angle compared to the single projection type, there is no problem of depth inversion of the reproduced image, no flipping phenomenon, and the resolution of the 3D image can be further improved. There is a remarkable effect such as that there is.

Claims

In the projection type integrated imaging method,

Multi-projection integrated imaging method characterized in that a plurality of projectors 200 to generate a three-dimensional image by projecting on the convex mirror array at the same time in different positions.
The method of claim 1,

The geometric relationship between the opening of the projector 200 and the imaging point of the opening formed by the nth convex mirror of the convex mirror array 100 is
Multi-projection integrated imaging method characterized by following.
The method of claim 1,

The distance between the opening image points formed in each convex mirror constituting the convex mirror array 100 is
Multi-projection integrated imaging method characterized by following.