JPH10115878A - Three dimensional picture projection system using directional screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism for automatically aligning the optimum observation viewpoint position of a projection system which uses a directional screen and by which a three-dimensional picture can be observed without exclusive glasses with the viewpoint position of an observer in the projection system, so that a picture can be easily viewed. SOLUTION: The viewpoint position of an observer 9 is found by arithmetic calculation based on the measured value of sitting height, height, or shoulder height, etc., with a sensor, or measuring the eye position based on the picture inputted by a television camera. This system is provided with the mechanism for automatically aligning the viewpoint position with the optimum observation viewpoint position of the projection system so as to eliminate deviation by moving the entire projection system or the constituting part of projectors 6a and 6b, etc., or moving the seat of the observer or a floor where the observer is positioned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a three-dimensional image projection system using a directional screen.

[0002]

2. Description of the Related Art Conventionally, in order to observe a three-dimensional image projected on a screen, it is necessary to wear special glasses using a polarizing film or the like, which is troublesome, and since the image is dark, it is necessary to darken a projection room. there were.

[0003]

To solve the drawbacks of the prior art, a three-dimensional image is projected from a plurality of projectors via a half mirror onto a directional reflection screen by analogy with Patent Application Publication No. 47-29357. A method of observing the reflected light of the screen as a three-dimensional image with the naked eye and in a bright room can be considered. However, this method has the convenience of not using special glasses, but has a limited viewpoint position and has difficulty in finding the position. The present invention relates to a method for automatically matching an optimal observation viewpoint position of a system and an observer's viewpoint position in a three-dimensional image projection system using a directional reflection screen.

[0004]

[Means for Solving the Problems]

(A) A structure in which a plurality of projectors 1a and 1b can be moved by an automatic stage 4 capable of position control. (B) Based on the position of the observer 5 measured by the sensor, the controller calculates a projector movement amount for matching the optimal observation viewpoint position of the system with the observer's viewpoint position. 1b. At this time, not only the projector but also the half mirror 2 and / or the screen 3 may be moved at the same time. (C) A structure in which the observer 9 can be moved at least in the vertical direction by the automatic stage 10 capable of position control. (D) Based on the position of the observer 9 measured by the sensor, the controller calculates the amount of movement of the observer for matching the viewpoint height of the observer 9 with the optimal observation viewpoint position of the system, and calculates the automatic stage 10. To move the observer 9. (E) If position control is performed also in the left-right direction and the front-back direction of the observer's viewpoint position, the viewpoint can be adjusted with higher accuracy.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of implementing the present invention will be described by taking an example. A projector 1a for the right eye and a projector 1b for the left eye which are arranged at a distance between the left and right eyes of a human.
Is reflected by the half mirror 2 and is projected on the directional screen 3. At that time, the focus of the projector is usually adjusted to the screen. As the directional screen, a screen called a recurrent screen, in which reflected light returns toward the light source, is usually used. In the above system, the reflected light from the screen returns to the direction of the lens of the projector, and therefore, a point symmetrical with respect to the half mirror 2 of the lenses of the projectors 1a and 1b is the optimum observation viewpoint position. Now
When the observer's left eye is placed at the optimal observation viewpoint position of the image of the projector 1b, and the right eye is placed at the optimal observation viewpoint position of 1a, the image is extremely bright. The image of the projector 1a can be seen. In this system, since an element having a large aberration such as a lenticular lens does not enter the optical system, when a stereoscopic image is input to the projectors 1a and 1b, an extremely high-quality stereoscopic image can be observed. In this system, the screen can be set in the optical axis direction of the projector. That is, as shown in FIG.
When a and 6b are placed below and the screen 8 is placed above,
As described above, the point of symmetry of the lenses of the projectors 6a and 6b with respect to the half mirror 7 becomes the optimum observation viewpoint, and the viewpoint of the observer 9 may be adjusted here. In the case of this arrangement, since the position 11 where the image can be seen can be provided in the space, it is possible to exhibit in combination with the diorama 12 and the like. In a system using a directional screen, it is possible to use a large number of projectors. If images taken from multiple directions are projected at the same time, if the observer moves to the left, the image viewed from the left can move to the right. For example, an image viewed from the right can be observed, and a higher-level multi-view three-dimensional display can be obtained. As described above, the three-dimensional image projection system using the directional screen displays a high-quality image, but has a problem that it is difficult to match the optimal observation viewpoint position of the system with the observer's viewpoint position when it is unfamiliar. ing. In the left-right direction and the front-back direction, most of the problems can be solved by seating the observer in a chair that holds the body well. The problem is that the viewpoint height is directly measured,
Alternatively, the problem is solved by calculating from the position of the body part and automatically correcting the difference from the optimal observation viewpoint position of the system. Examples of the method of obtaining the viewpoint height include a method of positioning the projector 13 and the light receiver 14 of the light sensor at the observer and measuring the sitting height or height, and a method of measuring the transmitter 18 and the receiver 19 of the ultrasonic sensor overhead. The height of the top of the head is obtained by a method of measuring the position of the equipment such as the headphones 27 with a three-dimensional or two-dimensional measuring device 28, and from this value, the average height from the top of the head to the viewpoint is measured. There is a method of calculating the viewpoint position by subtracting the distance. At this time,
In order to cope with the difference in the distance from the top of the head to the viewpoint due to the height difference, the correction will be more accurate if corrected based on the measured sitting height or the absolute value of the height. If there are many people wearing hats, there is a method of measuring the height of the shoulder. Alternatively,
The observer 24 can be photographed by the television camera 23, and the position of the eye can be obtained by extracting features of image processing. The difference between the observer's viewpoint height obtained as described above and the optimal observation viewpoint position of the system is automatically corrected as follows. When the position of the observer is constant as shown in FIG. 1, the projectors 1a and 1b are moved in parallel by the automatic stage 4, and the optimal observation viewpoint of the system is adjusted to the viewpoint of the observer. In this case, if necessary, both or one of the half mirror 2 and the screen 3 may be moved at the same time. In the case where the image 11 and the diorama 12 are combined as shown in FIG. 2, if only one element of the system is moved, the image and the diorama are shifted, and it is not easy to move the entire system. Therefore, it is preferable to move the height of the observer 9 on the automatic stage 10 and adjust the observer's viewpoint position to the optimal observation viewpoint position of the system. Regardless of the method, the first automatic correction may be performed when the observer is in a fixed position, for example, when the observer is seated, and thereafter may be performed constantly or at regular time intervals. Although the problem can be solved by the above-described method, the accuracy can be further improved by detecting a deviation in the left-right direction and the front-back direction by a method such as image measurement and performing automatic correction.

[0006]

According to the present invention, a three-dimensional image projection system using a directional reflection screen having a feature that a high-quality three-dimensional image can be viewed in a bright room without wearing special glasses is almost the only drawback. The difficulty in finding the observation viewpoint position was solved, and the practicality was improved.

[0007]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a three-dimensional image projection system of the present invention in which a directional screen is installed in a direction in which projection light of a projector is reflected by a half mirror.

FIG. 2 is a configuration diagram of a three-dimensional image projection system according to the present invention, in which a directional screen is installed in a direction in which projection light from a projector has passed through a half mirror.

FIG. 3 is a block diagram of an apparatus for measuring the position of the top of the observer using a light beam sensor and instructing the amount of movement of the automatic stage by a control device from the data as a method of indicating the amount of movement of the automatic stage of the present invention. .

FIG. 4 is a configuration diagram of a method of using an ultrasonic sensor to measure the position of the top of the head of an observer according to the present invention.

FIG. 5 is a configuration diagram of a method of measuring a viewpoint position by image measurement from an image of an observer's face captured by a television camera according to the present invention.

FIG. 6 is a configuration diagram of a method for measuring the position of headphones worn by an observer and measuring the position of the head of the observer according to the present invention.

[Explanation of symbols]

 Reference Signs List 1a Right-eye image projector 1b Left-eye image projector 2 Half mirror 3 Directional screen 4 Automatic stage 5 Observer 6a Right-eye image projector 6b Left-eye image projector 7 Half mirror 8 Directional screen 9 Observer 10 Automatic stage REFERENCE SIGNS LIST 11 image viewing position 12 diorama 13 light sensor light transmitter 14 light sensor light receiver 15 light beam 16 observer 17 control device 18 ultrasonic sensor transmitter 19 ultrasonic sensor receiver 20 ultrasonic 21 observer 22 control device 23 Television camera 24 Observer 25 Image processing device 26 Control device 27 Headphones 28 3D or 2D measuring device 29 Observer 30 Control device

Claims (2)

[Claims] The difference between an observer's viewpoint position measured by a sensor or image measurement and an optimum observation viewpoint position of a projection system is automatically matched by moving the whole projection system or a partial component such as a projector. A three-dimensional image projection system using a directional screen, which is provided with a mechanism for causing the image to be projected. 2. The difference between the observer's viewpoint position measured by a sensor or image measurement and the optimum observation viewpoint position of the projection system is automatically determined by moving the observer's seat or the observer's floor. A three-dimensional image projection system using a directional screen, provided with a mechanism for matching the image.