JPH07134542A - Periscopic video display device - Google Patents

Abstract

PURPOSE:To simulatively display a periscopic video without impairing high resolution and to inexpensively realize it. CONSTITUTION:As for a video signal from a video signal generator 1, the center of a displayed picture in a vertical direction is enlarged in a longitudinal direction, and both upper and lower sides are reduced by an image converting means 2. The signal enlarged and reduced to be converted in the vertical direction is scanned at regular intervals so as to be the video signal. The video signal is displayed as a video on a display device 3. Contrary to the conversion of the image converting means, an inverse image conversion optical device reduces the central part of the image displayed on the display device 3. This, many scanning lines are included in the vicinity of the central part, so that the resolution becomes high.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submarine training device and a game machine for simulating and displaying a periscope image of a submarine.

[0002]

2. Description of the Related Art A conventional periscope image simulation display device is shown in FIG.
As shown in (a), a video signal generator (CGI) 21
And a display device 22 for displaying an image by inputting the image signal generated there, and a peephole 23 for viewing the image as an image from a periscope.

In the video signal generator 21, the original image (see FIG.
The video signal processing of (b)) is digitally performed and output as a video signal 25. The display device 22 receives the image signal 25 and displays an image (FIG. 2C) on the display surface. The observer 24 views the image (FIG. 2C) on the display surface of the display device 22 through the peephole 23.

[0004]

Since the conventional periscope simulation display device is configured as described above, in order to visually recognize a distant ship or the like on the ocean, a high resolution comparable to that of human eyes is achieved. The video signal generator and the display device were required. However, high-resolution video signal generators and display devices are expensive, and there is a technical limit to display devices that display up to the resolution of human eyes.

The present invention has been made in order to solve the above problems, and displays a distant ship or the like without impairing the high resolution, and discovers an important distant target with a training device.
It is an object of the present invention to provide an inexpensive periscope simulation display device capable of performing training for identifying the posture of a target object and the type of target object.

[0006]

A periscope simulation display device according to the present invention for solving the above problems is a video signal generator for generating a video signal, and a display device for inputting the video signal to display a video. With. The video signal generating device is provided with an image converting means for generating a video signal in which a vertical central portion of a display image is vertically expanded, and an image reverse converting optical device for reducing the central portion of the image displayed on the display device. It is provided in front of the display device.

Here, the video signal generator may obtain the image data by computer graphics, and the image conversion means may perform the non-linear coordinate conversion on the image data, or a television camera is used. The objective lens may form an image so that the central portion in the vertical direction is magnified in the vertical direction, and this video signal may be reproduced.

Further, as an image inverse conversion optical device, the image is reflected by a distortion reflector or a distortion prism whose reflection surface is distorted,
Alternatively, the image can be made visible by transmitting through a distortion lens.

[0009]

[Operation] The periscope image display device configured as described above is
It works as follows.

In the video signal from the video signal generator, the center of the display image in the vertical direction is vertically expanded by the image conversion means, and both upper and lower ends are reduced. The signal that has been scaled up and down in the vertical direction becomes an image signal that is scanned at equal intervals. The image inverse conversion optical device reduces the central portion of the image displayed on the display device, which is the reverse of the conversion performed by the image conversion means. Therefore, many scanning lines are included in the vicinity of the center, and the resolution becomes higher. The part where the resolution is high is the part where the human gazes, that is, the center part of the screen simulating the vicinity of the horizon seen from the periscope, while the part where the human does not gaze even if the vertical resolution is lowered. Therefore,
Withstand practical use.

[0011]

[First Embodiment] An embodiment of a periscope simulation display device according to the present invention will be described below with reference to the drawings.

Before describing the embodiments, the resolution of the human eye and the field of view of the periscope will be described.

The resolution of the human eye is the fovea (center of retina).
As shown in FIG. 3, the area of high resolution is limited to a very narrow visual field.

The periscope can be switched at several magnifications, but as shown in FIG. 4, an observer 42 looking through the eyepiece 41.
Has a constant viewing angle of, for example, about 50 °.

A method for operating a periscope to detect and identify a distant ship will be described. At first, if you look at the horizon near the horizon at a low magnification in the horizontal direction, and if you find even one tiny point, you will pay attention to that point and switch to a higher magnification to confirm and identify the discovery. Thus, although the periscope has a wide viewing angle in the vertical direction, the part observed by the observer is only near the horizon. Also, the attitude of the submarine when operating the periscope is not tilted, so the horizon is located horizontally in the vertical center of the periscope.

In consideration of the operation of the periscope, the present invention enhances the resolution in the vicinity of the horizon, that is, in the vertical center of the display image, and it is not so important at the upper and lower edges and the poor resolution of the human eye. In consideration of this, the resolution is lowered to make it suitable for the operation of the periscope.

FIG. 1 (a) is a block diagram of an embodiment of a periscope simulation display device. 1 is a video signal generator, 2 is a non-linear coordinate conversion means in the video signal generator 1, and 3 is a display. A device, 4 is a distortion reflector which constitutes an image inverse conversion optical device, and 5
Peephole, 6 is an observer, 7 is a controller, and 11 is a video signal converter. 1 (b) to 1 (e) are diagrams for explaining signals or images of each unit.

The video signal generator (CGI) 1 digitally performs signal processing of video by a computer graphics method to obtain an image signal (before the non-linear coordinate conversion (NL) processing shown in FIG. 1B). Shape). The non-linear coordinate conversion means 2 converts the image signal into a vertically distorted image signal by vertically expanding the central part of the screen in the vertical direction and inversely compressing the upper and lower edges of the screen. (Fig. 1 (c) graphic image). This image signal is converted into a video signal by the video signal converter 11 (see FIG. 1).
(D) graphic image).

The display device 3 is composed of a CRT and displays an image (FIG. 1 (d)) on the display surface by using the video signal as an input. This image (FIG. 1 (d)) is a vertically distorted image processed by the non-linear coordinate conversion means 2 of the image signal generator 1.

The light of the display image of the display device 3 is reflected by the distortion reflector 4 and reaches the eye of the observer 6 through the peephole 5 and forms an image on the retina. At this time, the distortion reflecting mirror 4 is formed by a convex mirror so as to reduce the display image of the display device 3. The radius of curvature of the central portion is made small so that the degree of reduction of the central portion becomes large, and the radius of curvature is made large so that the degree of reduction of the peripheral portion becomes small.

As a result, the image seen by the observer 6 is a figure generated by the image signal generator 1 before the non-linear processing (see FIG. 1).
The figure is the same as that in (b)) (FIG. 1 (e)). The figure whose central portion is reduced (FIG. 1E) is the original figure (FIG. 1E).
(B)) The central part is enlarged and displayed in detail, and after being scanned at equal intervals, the display device 3 displays the image. Then, the optical fiber is reduced by the distortion reflector 4, so the central part is scanned. High density, which results in high resolution. The left and right fine parallel lines shown in FIGS. 1D and 1E represent horizontal scanning lines.

[0022]

[Second Embodiment] In the first embodiment, the video signal generator 1 creates the computer graphics by digital processing, but in the second embodiment, a television camera as shown in FIG. 61 is used. The objective lens 62 of the television camera 61 forms an image on the image pickup element so as to vertically expand the central portion in the vertical direction. It is possible to record this video signal in the storage device 63 in advance and reproduce it under the control of the controller 7 during operation to display an image according to the operation of the periscope of the observer 6. The observer 6 can see the image of the display device 3 whose central portion is reduced by the distortion reflecting mirror 4 or an image reverse conversion optical device (a distortion lens, a distortion prism) described later, as in the first embodiment.

[0023]

[Third Embodiment] An image inverse conversion optical device for reducing the central portion of a display image can be realized by disposing a distortion lens 71 near the display surface of the display device 3 as shown in FIG. The display device 3 is similar to that of the first embodiment, as shown in FIG.
A graphic like (d) is displayed. The distortion lens 71 reduces the central portion of the displayed figure (FIG. 1 (d)) and
It looks like the original figure like (e).

[0024]

[Fourth Embodiment] As the image reverse conversion optical device for reducing the central portion of the display image, a distortion prism 91 having a reflecting surface distorted as shown in FIG. 7 is used, and the distortion reflecting mirror 4 of the first embodiment is used. The same action as can be performed. On the display surface of the display device 3, as in the first embodiment, the graphic of FIG. 1 (b) is converted into FIG. 1 (c) by the action of the image signal generator 1 and the non-linear coordinate conversion means 2. It is displayed as shown in FIG. The distortion prism 91 reflects the light rays from the incident surface in the same manner as the distortion reflecting mirror 4 of the first embodiment, and increases the degree of reduction in the central portion,
An image is formed at a predetermined position while reducing the degree of reduction of the end portion.

[0025]

Other Embodiments A CRT is used as an example of the display device, but a liquid crystal display device may be used. Further, although the peep hole is provided to limit the viewpoint of the observer 6, it may be replaced with an eyepiece lens.

[0026]

As described above, according to the present invention, the display image is vertically enlarged only in the upper and lower centers and is optically reduced only in the center after being displayed on the display device. It is possible to increase the resolution in the vertical center of the. As a result, the resolution in the vicinity of the horizon, which is important for submarine training, is increased, and it is possible to inexpensively manufacture a periscope image display device capable of effectively performing training for finding and identifying a distant ship or the like.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional periscope image display device.

FIG. 3 is a diagram illustrating the resolution of human eyes.

FIG. 4 is a diagram illustrating a field of view of a periscope.

FIG. 5 is a configuration diagram of main parts for explaining a second embodiment of the present invention.

FIG. 6 is a main part configuration diagram for explaining a third embodiment of the present invention.

FIG. 7 is a main part configuration diagram for explaining a fourth embodiment of the present invention.

[Explanation of symbols]

 1 ... Image signal generator 2 ... Non-linear coordinate conversion means 3 ... Display device 4 ... Distorted reflector 5 ... Peephole 6 ... Observer 61 ... Television camera 62 ... Objective lens 63 ... Storage device 71 ... Distortion lens 91 ... Distortion prism 11 ... Video signal converter

Claims (6)

[Claims] 1. A periscope image display device comprising a video signal generation device for generating a video signal and a display device for inputting the video signal to display an image, wherein the video signal generation device is arranged in a vertical direction of a display image. An image conversion unit for generating a video signal in which a central portion is enlarged in the vertical direction is provided, and an image reverse conversion optical device for reducing the central portion of the image displayed on the display device is provided in front of the display device. And a periscope image display device. 2. The periscope image display according to claim 1, wherein the image signal generating device obtains the image data by computer graphics, and the image converting means performs the non-linear coordinate conversion on the image data. apparatus. 3. A video signal generating device reproduces a video signal from a television camera provided with an objective lens for forming an image so as to vertically expand a central portion in a vertical direction. The periscope image display device according to claim 1. 4. The periscope image display device according to claim 1, wherein the image reverse conversion optical device is a distortion reflector. 5. The periscope image display device according to claim 1, wherein the image reverse conversion optical device is a distortion lens. 6. The periscope image display device according to claim 1, wherein the image reverse conversion optical device is a distortion prism whose reflection surface is distorted.