JP2600693B2 - 3D image playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a) Industrial Field of Application The present invention relates to a single camera type stereoscopic television signal reproducing apparatus,
In particular, the present invention relates to a reproducing apparatus capable of preventing unnatural jumping of a near view.

b) Conventional technology A single camera stereoscopic television has a feature that it is more compatible with the current television system and has a simpler device configuration than a two camera television. In addition, in single camera type,
It is possible to obtain a stereoscopic video signal having a small parallax that cannot be obtained with the two-camera system, and it is particularly effective in achieving compatibility with the current television system. There is a feature that can be recorded on a VTR. This technique is described in detail in Japanese Patent Publication No. 55-50639.

That is, an optical shutter divided into right and left is provided on the front surface of a lens of one camera, and an image is taken by switching left and right every vertical or horizontal scanning. On the reproduction side, a stereoscopic image can be obtained by displaying the images on two TVs with polarizing plates separated on the left and right and superimposing the images, or by switching with an electronic shutter and viewing through polarized glasses.

c) Problems to be solved by the present invention However, in the case of the conventional technique, there is a disadvantage that the foreground pops out unnaturally.

d) Means for Solving the Problem The left and right divided optical shutters are arranged close to the imaging device, and the left and right portions of the optical shutter are switched at predetermined time intervals to alternately photograph the right-eye image and the left-eye image. In addition, the right-eye image signal is delayed by a predetermined time with respect to the left-eye image signal so that the right-eye image is shifted by a predetermined width in the horizontal scanning line direction with respect to the left-eye image, and the image based on the delayed right-eye image signal And the image based on the left-eye image signal is superimposed to reproduce a stereoscopic image. The shift width in the horizontal scanning line direction is preferably about 1/3 to 1 of the distance between both eyes of a human.

e) Operation First, the difference between the two-camera type and single-camera type images will be described.
FIG. 2A shows a two-camera three-dimensional image. The focused image is at position 3 of the virtual image. However, in the single camera system, the position of the focused image is on the screen 1. Because the single camera type has only one lens, the image is focused on the front of the shooting surface both when the right half optical shutter is open and when the left half optical shutter is open, and it is in focus This is because there is basically no difference in the image from the case of a plane image simply photographed with one lens. But,
By putting the light shutter on the right half and the left half,
The position of the out-of-focus image (blurred image) differs between when the right half is open and when the left half is open, and this is extracted as parallax information. In Japanese Patent Publication No. 55-50639, attention is focused on simply shifting the equivalent center of the lens by opening and closing the optical shutter, but in the present invention,
The difference is that the focus is on the position of the blurred image.
Now, as shown in FIG. 3 (a), when three images A, B, and C are taken at different distances from the camera, images are formed at positions marked ABC, respectively, compared to the image forming plane 302. The image on the imaging surface 302 with respect to the image at the point A is as shown in FIG. 3D, and similarly, the point B is as shown in FIG. 3C and the point C is as shown in FIG. 3B.

As a result, for example, when the left half is open, the blurred image at the point A occurs on the right side of the imaging surface, and the blurred image at the point C occurs on the left side of the imaging surface. Naturally, the opposite is true when the right half optical shutter is open. The position of the blurred image is the essence of the parallax information. As a result, an image (L image) photographed by opening the left half of the image captured by the imaging surface 302 and an image (R image) photographed by opening the right half are projected at the same position, and the L image and the R image are projected. When viewed with the left eye and the right eye with polarized glasses or the like, the image at point A appears far and the image at point C appears near. However, as described above, in the single-camera system, an in-focus image (for example, an image at point B) is on the screen, so that a close C
The point image appears to jump out of the screen. This was extremely unnatural.

Therefore, in the present invention, this problem is solved by the means described in section d).

That is, in the present invention, the L image and the R image are
By arranging them at the 2L and 2R positions, respectively, a natural stereoscopic image without pop-outs similar to that taken by the two-camera system is obtained.

f) Embodiment FIG. 1 shows an embodiment, in which an optical shutter divided into right and left is provided on the front surface of a photographing lens of a television camera, and switching is performed for each vertical synchronization signal.

As a discrimination signal between the L image and the R image, for example, if the color burst signal is 8 Hz for the L image and 12 Hz for the R image, it can be transmitted as a normal NTSC television broadcast. The technology so far is described in the above-mentioned Japanese Patent Publication No. 55-50639.

On the receiving side, if the L image and the R image are superimposed on the same screen and viewed without glasses (that is, when the image is received by a conventional TV receiver), it can be previewed as a normal television broadcast.

Here, two receivers or projectors with polarizing filters of different angles are prepared, and the images are superimposed and shifted so that the R image is 2 to 6 cm to the right compared to the L image. If you look at it, you can see a stereoscopic image in which the foreground does not pop out.

The image shifting method can be realized by, for example, inserting a delay circuit in an R image receiver or projector to delay the 1 / 100H to 1 / 10H horizontal synchronization signal. Furthermore, a semiconductor memory is put on both the L image side and the R image side as a delay circuit,
The flicker can be eliminated by synchronizing the light emission of the L image and the R image or by displaying the immediately preceding image again while the optical shutter of the camera is closed. Of course,
The semiconductor memory itself may be designed to have a time difference for shifting the L image and the R image. As a method of superimposing images of two TV receivers, a method using a half mirror is known, but using a single receiver of a system in which a polarization angle is switched by a liquid crystal shutter, the burst signal or the like is used. The liquid crystal shutter may be switched by a signal for distinguishing the L image and the R image.

g) Effects of the Invention By implementing the present invention paying attention to the position of the blurred image, a natural single-camera type three-dimensional image reproducing apparatus without an unnatural pop-out of the near view can be obtained. As a result, it is possible to effectively use a simple three-dimensional television broadcast that is compatible with the current television, which is a property of a single-camera three-dimensional television.

[Brief description of the drawings]

FIG. 1 is an embodiment, FIG. 2 is a comparison diagram of a stereoscopic image, FIG. 2 (a) shows a two-camera type stereoscopic image, and FIG. 2 (b) shows a single camera type stereoscopic image. FIG. 3 shows a blurred image in single-camera stereoscopic photography. FIG. 3 (a) is an overall view, FIG. 3 (b) is a distant view, FIG. 3 (c) is a focused image, and FIG. 3 (d). Indicates a foreground view.

Claims (1)

(57) [Claims] 1. A right-eye image and a left-eye image are alternately switched by switching an optical shutter divided into right and left at predetermined time intervals.
A three-dimensional image reproducing apparatus that obtains a three-dimensional image by reproducing an image signal output from the imaging apparatus by capturing an image with one imaging apparatus, extracting a right-eye image signal and a left-eye image signal from the video signal. The extracted right-eye image signal is delayed by a predetermined time with respect to the left-eye image signal, and the delayed right-eye image signal and the left-eye image signal are combined and displayed on the same display screen. A three-dimensional image reproduction device.