JPS6126278B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally, two cameras have been used to replace human eyes, and signals from the left and right cameras are transmitted or recorded to reproduce a stereoscopic image. However, in order to capture 3D images, unless the optical conditions of the imaging system and reproduction system are maintained accurately, a natural 3D effect cannot be obtained, which requires a lot of experience and has moved beyond the realm of systematic, made-to-order production. It's something that doesn't exist.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an apparatus that can easily capture and reproduce stereoscopic images by taking into consideration the optical conditions of the imaging system and the reproduction system. It is.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a stereoscopic image capturing system. The left and right cameras 1 and 2 are placed apart by a distance l, and the subject 3
is imaged from a distance L. In this case, the angle θ formed by the two cameras 1 and 2 and the subject 3 can be expressed as tanθ/2≈θ/2=l/2L (1). When capturing a three-dimensional image, the focus is first adjusted by the distance L from the subject 3, and the interval l is determined in consideration of the three-dimensional image reproduction system. Furthermore, if the camera is to have a zoom function to provide more freedom in image capturing, the zoom ratio z must also be determined. However, in this case, the distance between the cameras is l
If the zoom ratio z and z are not determined appropriately, the three-dimensional effect of the reproduced three-dimensional image will become unnatural, jump out to the front, or go too far into the background. Also the angle θ
The adjustment must also be set as shown in the first equation, taking into account the relationship between the distance L and the interval l.

The present invention takes into consideration the optical systems of the imaging system and the reproduction system, and the above-mentioned camera interval l, subject distance L, zoom ratio z,
A 3D television device that has a 3D image pickup device with a function to automatically adjust the angle θ, and is configured to reproduce 3D images using a recording and transmission method and an electrical or mechanical shutter. .

Figure 2 shows a configuration diagram of the imaging system and reproduction system, where 4 is the distance when the human eye looks directly at the object 3, 5,
6 is the position of the left eye and right eye when looking directly at subject 3, ls is the mutual distance between the left and right eyes, 8 is for reproduction
CRT, 9 is the image taken by the left camera 1 of the imaging system A, 10 is the image taken by the right camera 2, Ls is the distance between the CRT 8 of the reproduction system B and the eye, 5' and 6' are the images taken by the reproduction system B, respectively. The positions of the left and right eyes of , 7 is camera 1,
2 represents the second control device. As shown in imaging system A, the image seen from a distance of 4 from subject 3 is captured by CRT8.
If images are captured by the left and right cameras 1 and 2 placed at positions 5 and 6 away from positions 5 and 6 by a distance Ls, the CRT
8 can reproduce the same image as when viewed at a distance of 4. In this case, the zoom ratio z of the camera is set so that the subject 3 is imaged at the same viewing angle as when viewed with the actual eye, and this is set as the zoom ratio z=1. The distance between the average human eyes is about 7 cm, and camera 1 in Figure 2
The distance l between and 2 is smaller than 7 cm, and this setting is difficult in practice.

Humans' sense of perspective and three-dimensionality is largely due to the difference in visual angle between images seen with the right eye and images seen with the left eye. Therefore, the configurations of the imaging system A and the reproduction system B shown in FIG. 2 may be reproduced geometrically while also taking into account the zoom ratio z.

FIG. 3 shows the imaging conditions when the subject 3 is at a distance L and when the subject 3 is at a distance L/2,
Assuming that the distance l between the cameras 1 and 2 is constant and the distance L is sufficiently larger than the distance l, the following holds true: tanθθ=l/L (2).

Next, the case of changing the zoom ratio z will be considered with reference to FIG. Subject 3 at distance L is at distance L/2
To capture an image as if it were close to , double the zoom ratio z, double the image of subject 3 captured by the camera,
Let the interval l be 2 l, and the angle formed by the camera be from θ to 2θ. In other words, a proportional relationship holds between the zoom ratio z and the interval l, which can be expressed as l=k・z+lo...(3), and from the second equation, θ=(k・z+lo)/L...(4) The relationship holds true. k and lo are imaging system A and reproduction system B
is a constant determined by the geometrical configuration of
[cm]lo=O.

The adjustment of the distance l and the angle θ by the control device 7 is performed by digitally converting the zoom ratio z and focus information so as to satisfy the third and fourth equations, and applying the converted information to the pulse motor. It's easy to do.

FIG. 5 shows a configuration diagram of a stereoscopic imaging system equipped with a control device 7 that automatically adjusts the distance l and angle θ so as to satisfy the third and fourth equations as described above, and FIG. The main part waveform diagram is shown. 6a and 6b show the waveforms of signals 8 and 9 from the left and right cameras 1 and 2, respectively, with a discrimination signal 10 for left and right discrimination being added to one of the signals (for example, signal 9). 11 is an encoder circuit which switches signals 8 and 9 and outputs them as one signal as shown in FIG. 6c. A video tape recorder 12 is capable of recording and reproducing the encoder circuit 11 output signal, and a switch 13 selects transmission and recording of the encoder circuit 11 output signal. 14 is a decoder circuit, which is connected directly to the encoder circuit 11 via the switch 13 or to the video tape recorder 12.
The discrimination signal 10 in the signal 15 in FIG. When information is being reproduced, the shutter on the left eye side is selectively opened, and when the information of the right camera 2 given by signal 9 in signal 15 is being reproduced, the shutter on the right eye side is opened. It is configured to open selectively. Note that the control device 7 controls the mutual distance l between the cameras 1 and 2 and the camera 1 based on the focus and zoom ratio information.
The angle θ forming the line of sight between the two is electrically or mechanically adjusted so as to satisfy l=k·z+lo θ=(k·z+lo)/L as described above. Furthermore, cameras 1 and 2 are autofocus.

As explained above, according to the present invention, since the control device automatically adjusts the stereoscopic imaging camera to satisfy predetermined conditions, stereoscopic images can be easily captured without requiring knowledge of optical systems. This allows even inexperienced people to use the system, and improves the operability of stereoscopic imaging cameras, which have been lagging behind in the past.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the imaging system for stereoscopic images, Figure 2 is an explanatory diagram of the relationship between the imaging system and reproduction system, Figure 3 is an explanatory diagram of the conditions for imaging subjects at different distances, and Figure 4 is an illustration of the use of zoom. FIG. 5 is a configuration diagram of the stereoscopic image system, and FIG. 6 is a waveform diagram of the main part of FIG. 5. 1...Left camera, 2...Right camera, 3...
Subject, 7... Control device, 10... Discrimination signal, 1
1...Encoder circuit, 14...Decoder circuit,
16...Glasses-style shutters.

Claims (1)

[Scope of Claims] 1. A stereoscopic television device that captures a stereoscopic image having left and right information using two cameras,
The distance between the cameras on the stand is 1, the angle formed by the line of sight of the two cameras is θ, the distance between the two cameras and the subject is L, the zoom ratio of the camera is z, and the geometry of the imaging system and playback system is When the constants determined by the configuration are k and lo, the distance between the cameras is automatically adjusted based on the focus adjustment and boom ratio so that l=k・z+lo θ=(k・z+lo)/L. A stereoscopic television device characterized in that it is configured to adjust the angle θ and the angle θ. 2. The stereoscopic television apparatus according to claim 1, wherein the stereoscopic television apparatus is configured to automatically adjust focus. 3. Superimpose the left and right discrimination signals on at least one of the signals obtained by imaging with two cameras, and combine both signals into one.
Encoder means for switching and selectively outputting each field; and driving a shutter for selectively opening and closing the left and right visual fields in synchronization with the discrimination signal by extracting the discrimination signal from the signal outputted through the encoder means. 2. The stereoscopic television apparatus according to claim 1, further comprising decoder means for decoding.