JPH0530503A - Image display/pickup device - Google Patents

Abstract

PURPOSE:To prevent images other than a reflected image to be a picked-up image from being entered into an image display/pickup device by attaining the coincidence of visual fields by means of a semitransparent mirror. CONSTITUTION:In the image display/pickup device constituted of arranging the semi-transparent mirror 4 in the front of a display device 1 and picking up the image of an object M by an image pickup device 2 as a reflected image from the mirror 4, the mirror 4 is constituted of a visual field selecting transparent base so that an object A other than the object M is not entered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display / image pickup device in which a display device and an image pickup device used in a TV telephone or a TV conference system are combined.

[0002]

2. Description of the Related Art In recent years, two-way video communication such as a TV telephone and a TV conference system in which remote locations are connected by a video / audio communication network has rapidly spread due to the development of communication technology such as image coding technology. . In the future, it is expected that a more realistic video service can be provided by enhancing the ISDN network and increasing the bandwidth of the transmission network.

FIG. 8 shows a display / imaging device currently used for two-way video communication. The image pickup device 2 is on the upper surface or the side surface of the display device 1 such as a CRT display, and picks up an image of the user. However, since a person who uses such a device looks at the normal display device 1, the user does not turn his or her gaze toward the imaging device 2 even when the imaging device 2 captures an image. Therefore, there is a drawback in that even if it is possible to transmit a highly realistic image, it becomes an unnatural conversation in which the line of sight of the interlocutors do not match.

As a method of matching the line of sight of the interlocutors, there is a method using a semi-transparent mirror (half mirror). FIG. 9 shows a block diagram of a display / imaging device using a semi-transparent mirror. Display device 1
The semi-transparent mirror 3 is tilted by a certain angle θ in front of, and the depth is set to d. The image from the subject M is reflected by the semi-transparent mirror 3 and is imaged by the imaging device 2 installed above or below the semi-transparent mirror 3. As a result, since the line of sight of the user is directed to the display device 1, the line of sight of the caller and the line of sight of the other party displayed on the display screen match.

[0005]

However, when the semi-transparent mirror 3 is used, there is a drawback that an image through the semi-transparent mirror 3 is also captured in addition to the reflected image. For example, since the object A below the semi-transparent mirror 3 in FIG. 9 is imaged together with the subject M,
As shown in FIG. 10, the object A is displayed as a ghost on the image pickup screen, and the image quality of the picked-up image deteriorates. As shown in FIG. 11, the actual TV telephone device is arranged in one box 8 so that an external object image is not reflected, but
The display screen reflected by the semi-transparent mirror 3 may be reflected on the bottom surface of the box 8 and enter the imaging device 2. Therefore, in order to improve the quality of the captured image, it is an urgent task to prevent the reflection of an image other than such a reflected image.

The present invention prevents reflection of an image other than a reflected image, which is a captured image, in a display / imaging device used in a TV telephone, a TV conference system, etc., which realizes line-of-sight matching using a semi-transparent mirror, The purpose is to improve the image quality of video images.

[0007]

In the display / imaging device according to the present invention, a semi-transparent mirror is installed in front of the display device, and a semi-transparent mirror is used for imaging a subject as a reflected image of the semi-transparent mirror. It is configured by using a field-selective transparent substrate, or by arranging a polarizer on the front surface of the image pickup device or both of the display device and the image pickup device.

[0008]

The present invention prevents the reflection of images other than the reflection image by using a semi-transparent mirror made of a material having a field-of-view selectivity or through a polarizer to display and pick up the image, and thus the image quality of the picked-up image is simplified. Improve to.

[0009]

1 is a block diagram showing an embodiment of a display / imaging device according to the present invention. Although the configuration is almost the same as that of the conventional display / imaging device shown in FIG. 5, the semi-transparent mirror 4 is formed by using a transparent substrate (for example, an angle name 21 manufactured by Nippon Sheet Glass Co., Ltd.) having a field-selective material. The composition is very different. In the semi-transparent mirror 4 using the transparent substrate having such a visual field selection function, as shown in FIG.
From the front viewpoint, it looks opaque only in a certain viewing direction, and when the viewpoint is above or below as shown in FIG. 2B, the entire transparent substrate looks opaque.
Therefore, in the direction in which the imaging device 2 appears opaque in FIG. 1, that is, from the center of the semi-transparent mirror 4 as in FIG.
If the image pickup device 2 is installed in the direction, the image pickup device 2 can pick up only the reflected image, and the quality of the picked-up image can be improved.

FIG. 3 shows another embodiment of the display / imaging device according to the present invention, and is a sectional view of a semi-transparent mirror 4 constructed by combining a plurality of minute semi-transparent mirrors. As the structure of the semi-transparent mirror 4 in FIG. 3, a plurality of conventional micro-semi-transparent mirrors 5 are formed on the surface of a field-selective transparent substrate (product name: Angle 21 manufactured by Nippon Sheet Glass Co., Ltd.) 4A. When the micro-semitransparent mirror 5 is combined and configured, the display device 1 and the image pickup device 2 are arranged on the same straight line, so that there is a drawback that the display screen is reflected on the image pickup screen. However, by disposing the image pickup device 2 in a direction in which it looks opaque and by arranging the array of the minute semi-transparent mirrors 5 so as to reflect the reflected image of the subject M in that direction, reflection of the display screen at the time of image pickup is prevented. be able to.

FIG. 4 shows a block diagram of a display / imaging device when the semi-transparent mirror 4 shown in FIG. 3 is used. The image pickup device 2 is installed in the visual field direction in which the semi-transparent mirror 4 looks opaque. Specifically, when the angle 21 is used for the view-selective transparent substrate 4A, the view direction that appears to be opaque is 30 to 60 ° with respect to the normal to the semi-transparent mirror, and thus the semi-transparent mirror 4 has a small semi-transparent direction. By setting the inclination θ of the transparent mirror 5 in the range of 20 to 25 °, the image pickup device 2 can be installed in the above-mentioned visual field direction.

FIG. 5 shows an embodiment of the present invention using a polarizer. Reference numerals 6 and 7 are polarizers, and their operation is shown in FIG.
The light passing through the polarizer 6 vibrates in the electric field only in a specific direction, and therefore cannot pass through the polarizer 7 having a polarization direction deviated by 90 degrees from that direction. By using this effect, as shown in FIG. 5, if the polarizers 6 and 7 are provided on the entire surface of the display device 1 and the entire surface of the image pickup device 2 in the relationship as shown in FIG. 6, the display shown by the solid line in FIG. No image reflection occurs. However, the brightness of the surface viewed from the subject M and the amount of light incident on the imaging device 2 are reduced.

Further, when the liquid crystal display 11 is used as the display device as shown in FIG. 7, since the polarizer is originally inside the liquid crystal display, the polarizer 6 having a polarization direction deviated from the polarization direction is imaged. The same effect can be obtained simply by placing it on the front surface of the device 2. In this case, it goes without saying that the brightness of the display screen does not change.

The above effect is obtained by the semi-transparent mirror 3 arranged at 45 degrees.
However, as with the case of the semi-transparent mirror 4 using the field-selective transparent substrate 4A, it is needless to say that it is also effective in the case of the semi-transparent mirror 4 configured by combining a plurality of minute semi-transparent mirrors 5. Absent.

[0015]

As described above, according to the present invention, the semi-transparent mirror is composed of the field-selective transparent substrate, or the polarizer is arranged on the entire surface of the image pickup device or on the front surface of both the image pickup device and the display device. As a result, the reflection of the display screen on the captured image can be prevented.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a display / imaging device of the present invention.

FIG. 2 is a diagram illustrating a transparent substrate having a function of visual field selectivity used in the present invention.

FIG. 3 is a sectional view showing another embodiment of the semi-transparent mirror used in the present invention.

4 is a configuration diagram of a display / imaging device of the present invention using the semi-transparent mirror shown in FIG.

FIG. 5 is a configuration diagram showing another embodiment of the present invention.

FIG. 6 is a diagram for explaining the action of the polarizer in the embodiment of FIG.

FIG. 7 is a configuration diagram showing still another embodiment of the present invention.

FIG. 8 is a configuration diagram of a conventional display / imaging device.

FIG. 9 is a sectional view of a conventional display / imaging device using a semi-transparent mirror.

FIG. 10 is a diagram for explaining image quality deterioration of the captured image of the conventional example of FIG.

FIG. 11 is a diagram for explaining a problem of a conventional display / imaging device.

[Explanation of symbols]

1 Display device 2 Imaging device 3 semi-transparent mirror 4 Semi-transparent mirror using field-selective transparent substrate 4A Field-selective transparent substrate 5 Micro semi-transparent mirror 6 Polarizer 7 Polarizer 8 boxes 11 LCD display

Continued front page    (72) Inventor Shigenobu Sakai             1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation

Claims (2)

[Claims] 1. A display device, an imaging device, and a semi-transparent mirror, wherein the semi-transparent mirror is installed in front of the display device, and a subject in front of the display device is surrounded by the semi-transparent mirror as a reflection image from the semi-transparent mirror. In the display / image pickup device for picking up an image by the image pickup device installed in, a display characterized by comprising the semi-transparent mirror using a field-selective transparent substrate.
Imaging device. 2. A display device, an image pickup device, and a semi-transparent mirror, wherein the semi-transparent mirror is installed on the entire surface of the display device, and a subject in front of the display device is surrounded by the semi-transparent mirror as a reflection image from the semi-transparent mirror. In the display / imaging device for performing imaging with the imaging device installed in, a display / imaging device in which a polarizer is disposed on the front surface of the imaging device or both the display device and the front surface of the imaging device.