JP2709772B2 - Observer tracking display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an observer-following display device, and more particularly to a field requiring a stereoscopic image, such as a stereoscopic television, a stereoscopic video, and a stereoscopic videophone and a stereoscopic videoconference which mutually communicate between remote places. In addition, the present invention relates to an observer-following display device used for a real-life conference or the like where an image display corresponding to an observation position is required.

[0002]

2. Description of the Related Art Conventionally, as a means for displaying a three-dimensional image, there is a method using a lenticular lens sheet (Takataka Ohkoshi; three-dimensional image engineering, industrial books). In this method, special glasses (polarized glasses, liquid crystal shutter glasses) are not required, so that a stereoscopic image can be viewed without discomfort.

FIG. 5 is a diagram showing an example of a conventional three-dimensional display device using a lenticular lens sheet. In FIG. 5, images in four different directions are represented by four cameras 41 and 4.
2, 43, and 44, and the image is input to four projectors 21, 22, 23, and 24, and projected onto the three-dimensional display screen 7. The three-dimensional display screen 7 has a structure in which two lenticular lenses 1 and 1 are attached to each other and a transmission type diffusion layer 5 is provided therebetween. The focal point of the lenticular lens 1 is set substantially at the position of the transmission type diffusion layer 5. The observer 3 is located on the opposite side of the projectors 21 to 24 with the stereoscopic display screen 7 interposed therebetween.

FIG. 6 is a diagram for explaining the principle of viewing a stereoscopic image using a conventional lenticular lens. In FIG. 6, images in four different directions are represented by projectors 21 to 21.
The image is projected toward the stereoscopic display screen 7 by 24. The feature of the three-dimensional display screen 7 is that an elephant projected on the three-dimensional display screen 7 at the same distance as the projection distance is reproduced. When the projectors 21 to 24 are arranged at the distance between the eyes, the reproduced images 61 to 64 are also reproduced at the distance between the eyes at the observation distance. In the example shown in FIG. 6, the observer is looking at the images 62 and 63 of the projectors 22 and 23.
Since the projected re-developments 62 and 63 have a video parallax, the observer 3 can see a stereoscopic image.

[0005]

The problems of the above-mentioned three-dimensional display include the following points. That is, the stereoscopic viewing area that can be viewed by the observer 3 by the above method is about 6.5.
cm (the distance between human eyes) x the number of directions -1). In the example shown in FIG. 6, the stereoscopic viewing area is 13.5 cm, which is not enough. When viewed by a large number of people, a stereoscopic image can be seen at a period of 13.5 cm, but an observer looking at the center and a viewer looking at the periphery see almost the same stereoscopic image. When a meeting with a sense of realism is assumed, when viewed from an oblique direction with this method, an image in an oblique direction can never be seen. Therefore, in order to view a stereoscopic image according to the direction specified by the observer, a number of projectors equivalent to the number of input cameras are required, which increases the scale of the apparatus in the input system and the display system and increases the cost. Further, in such a method, the stereoscopic viewing position in the left-right direction can be widened, but there is a problem that the stereoscopic viewing distance in the depth direction cannot be widened.

SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide an observer-following display device in which the position of an observer who views a stereoscopic image is not limited, and the stereoscopic image can be viewed from the observer's viewing direction. To provide.

[0007]

According to the present invention, there is provided a three-dimensional display screen in which two lenticular lenses are stuck,
An observer-following display device that uses a right-eye image projector and a left-eye image projector as a set of three-dimensional projectors to display a three-dimensional image projected on a three-dimensional display screen, comprising two lenticulars The lenses have different focal lengths, and the three-dimensional projector is provided so as to correspond to each of the N observers in a one-to-one correspondence. According to the respective observation positions of the N observers, a corresponding stereoscopic projector is provided. When the stereoscopic projector is moved back and forth according to the observer's back and forth movement and projected onto the three-dimensional display screen, the size of the display object in the projected image is three-dimensional. Image processing means for performing image processing so as not to substantially change on the display screen.

[0008]

In the observer-following display device according to the present invention, a stereoscopic projector is provided for each of the N observers, and a stereoscopic projector corresponding to each observation position of each observer is provided. When moving and projecting the stereoscopic projector back and forth with the observer's back and forth movement, image processing is performed so that the size of the display object in the projected image does not substantially change on the three-dimensional display screen. It is.

[0009]

FIG. 1 shows an embodiment of the present invention.
With reference to FIG. 1, the stereoscopic display screen 8 is composed of two lenticular lenses 81 and 82 and a transmission type diffusion layer 83 provided therebetween. The two lenticular lenses 81 and 82 have substantially the same lens pitch and different focal lengths f ₁ and f ₂ . The focal plane of each of the lenticular lenses 81 and 82 is substantially a transmission diffusion layer 83. On one side of the three-dimensional display screen 8, three-dimensional projectors 91 to 94 are provided. Each of the three-dimensional projectors 91 to 94 includes a right image projection projector 91R to 94R and a left image projection projector 91L to 94L. It is configured to project an image toward the stereoscopic display screen 8.

The three-dimensional projectors 91 to 94 have a one-to-one correspondence with the observers 101 to 104, respectively. The three-dimensional projectors 91 to 94 are linked with the movements of the observers 101 to 104, respectively.
In the above, for example, when the observer 101 moves rightward, the stereoscopic projector 91 also moves rightward,
When 01 moves to the left, the stereoscopic projector 91 also moves to the left. When the observer 101 approaches the stereoscopic display screen 8, the stereoscopic projector 91 also approaches the stereoscopic display screen 8, and the observer 101 moves to the stereoscopic display screen. 8, the three-dimensional projector 91 also moves away from the three-dimensional display screen 8. Other observers 102-10
3D projectors 92 to 94 corresponding to each of 4
Performs the same operation as described above.

The images projected by the three-dimensional projectors 91 to 94 are displayed as images corresponding to the positions of the viewpoints of the observers 101 to 104, respectively. Observer 1
Stereoscopic projectors 91 to 91 for movement of 01 to 104
The movement distance 94 moves substantially the same distance in the horizontal direction. Regarding the front-back direction, the observer 101-
For a moving distance m of 104, approximately m × (f ₁ / f ₂ )
The three-dimensional projectors 91 to 94 are moved at a distance of.
For example, assuming that the focal lengths f ₁ = 10 mm and f ₂ = 50 mm, for example, when the observer 101 moves one meter in the front-rear direction with respect to the stereoscopic display screen 8, the moving distance of the stereoscopic projector 91 is 20 cm. Here, the number of observers is four for explanation, but the number of observers is not limited and the number of stereoscopic projectors is not limited.

The positions of the observers 101 to 101 are detected by a three-dimensional magnetic sensor (IEEE Trans. Aerosp & Electron).
Syst., Vol. AES-15, No.5 1979), Image processing method using feature points (TV technique, Vol. 14, No. 5)
36, pp. 19-24, 1990) and a method of measuring the position of the observer using two PSDs for distance detection using infrared rays may be used. Is not limited.

FIG. 2 is a diagram showing a method of moving the stereoscopic projector according to one embodiment of the present invention. Referring to FIG. 2, a horizontal moving table 1 is provided on a horizontal moving rail 11.
41 to 144 are provided, and vertical moving rails 121 to 1 are provided on the respective horizontal moving tables 141 to 144.
24 is fixed. Rails 121-1 for vertical movement
24 is provided with vertical moving tables 131 to 134 on which three-dimensional projectors 91 to 94 are mounted. Then, the three-dimensional projectors 91 to 94 are respectively moved by the vertical moving bases 131 to 134 to the vertical moving rails 121 to 94.
124 to move in the vertical direction,
144 moves on the lateral movement rail 11.
The horizontal moving tables 141 to 144 and the vertical moving tables 131 to 134 are controlled based on the position information of the observer. Although the observers do not overlap each other, if the observers intersect, the stereoscopic projector 91 corresponding to the observer
９４94 can be switched to avoid collision of the three-dimensional projectors 91-94. A method of moving the three-dimensional projector that allows the front and rear overlap will be described with reference to FIG.

FIG. 3 is a front view of the stereoscopic display screen 8, and is a view for explaining a method of moving the stereoscopic projectors 91 to 94. Stereoscopic projector 91-
Reference numeral 94 is provided behind the three-dimensional display screen 8. Mobile stand 1 equipped with three-dimensional projectors 91 to 94
51 to 154 move back and forth and right and left by an electric caster (not shown) based on the position information of the observer. When the observers overlap each other, the stereoscopic projector 91
On the -94 side, the projection image of the rear three-dimensional projector is blocked by the front three-dimensional projector. In this case, the rear three-dimensional projector is lifted to a height at which the projection image is not obstructed by the three-dimensional projector in the front. The method of moving the stereoscopic projector is not limited to the above two types.

FIG. 4 is a diagram for explaining a projected image when the three-dimensional projector moves back and forth. In FIG. 4, a stereoscopic projector 9A projects an image 16A on a stereoscopic display screen 8, and the stereoscopic projector 9A
B projects an image 16B onto the stereoscopic display screen 8. Here, for simplification of description, only the right images are displayed as the projection images of the stereoscopic projectors 9A and 9B. When the stereoscopic projectors 9A and 9B approach or move away from the stereoscopic display screen 8, the focus of the stereoscopic projectors 9A and 9B is adjusted so as to always fit on the stereoscopic display screen 8. When the three-dimensional projector 9B approaches the three-dimensional display screen 8, the projected image area becomes smaller, and the image displayed at the same time becomes smaller. In FIG. 4, the stereoscopic projector 9B is a viewer 10B.
, The position of the projector corresponding to the projection image 16B corresponds to the projection image 1
It is projected smaller than 6A. Therefore, image processing is performed by a computer on the projector side so that an object image having the same size as the reference projected image 16A is displayed. Observer 1
As 0A or 10B approaches the stereoscopic display screen 8, an image with a higher resolution can be seen. Further, since the viewing angle does not change even when the observer 10A or 10B approaches the stereoscopic display screen 8, the realism is maintained. Similarly, when the observer 10A or 10B moves away from the stereoscopic display screen 8, an object image having the same size as the reference projected image 16A is displayed.

[0016]

As described above, according to the present invention, N stereoscopic projectors are made to correspond to each of N observers, and according to the movement of the observer based on the position information of each observer. To move the three-dimensional projector,
The viewer can view stereoscopically at any position. Furthermore, by using a stereoscopic display screen using lenticular lenses with different focal lengths, the moving distance of the stereoscopic projector can be smaller than the moving distance of the observer, and the scale of the device configuration can be reduced. it can. When the observer approaches the stereoscopic display screen, an object image with higher resolution can be seen.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram for explaining a method of moving the stereoscopic projector according to one embodiment of the present invention.

FIG. 3 is a front view of the screen for stereoscopic display,
It is a figure showing a moving method of a three-dimensional projector.

FIG. 4 is a diagram illustrating a projected image when the stereoscopic projector moves back and forth.

FIG. 5 is a diagram for explaining a conventional stereoscopic display method using a lenticular lens.

FIG. 6 is a diagram illustrating the principle of a conventional stereoscopic display method.

[Explanation of symbols]

 Reference Signs List 8 stereoscopic display screen 81, 82 lenticular lens 91-94 stereoscopic projector 11 horizontal movement rail 121-124 vertical movement rail 131-134 vertical movement base 141-144 horizontal movement base 151-154 movement base 16A, 16B projection image

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshio Nagashima 5th Sanraya, Daiya, Seika-cho, Soraku-gun, Kyoto Pref.

Claims (1)

(57) [Claims] 1. A three-dimensional display screen in which two lenticular lenses are stuck together, and a right-eye image projector and a left-eye image projector are used as a set of three-dimensional projectors, and projected onto the three-dimensional display screen. An observer-following display device for displaying a stereoscopic image, wherein the two lenticular lenses have different focal lengths, and the stereoscopic projector corresponds to each of N observers in a one-to-one correspondence. Moving means for moving a corresponding stereoscopic projector in accordance with the respective observation positions of the N observers, and the stereoscopic display screen, When the stereoscopic projector is moved back and forth to project, the size of the display object in the projected image is substantially on the stereoscopic display screen. Characterized by comprising an image processing means for image processing so as not to of, observer tracking display device.