JPS6261493A - Picture display device for stereoscopic vision - Google Patents

Abstract

PURPOSE:To properly perform a stereoscopic vision through liquid crystal glasses by outputting plural pulse signals as a set of synchronous signals to a display means every change over of a picture for a left yey and a picture for a right eye. CONSTITUTION:When an optical shutter 1a is turned ON and an optical shutter 1b is turned OFF, by making the first and the second vertical synchronous signals a set of vertical synchronous signals, the video data for a right eye is outputted from a video data producing means 12 through a display control signal outputted from a timing control means 17, inputted to a CRT display 14 through a D/A converting means 13 and displayed as a picture for the right eye. When the optical shutter 1a is turned OFF and the optical shutter 1b is turn ON, a picture for a left eye is displayed on the CRT display 14. In this manner, every change over of the picture, it is outputted on the CRT display 14, so that a non-display time can be easily extended. Therefore, a stereoscopic vision is properly performed through liquid crystal glasses 18.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a stereoscopic image display device that displays images for stereoscopic viewing.

[Technical Background of the Invention and Problems Therewith] In recent years, various CT apparatuses that display images of the inside of a human body in the form of tomographic images have appeared in the field of medical image diagnostic equipment.

Examples include an X-ray CT device that uses X-rays, an emission CT device that uses radioisotopes, an MR-CT device that uses magnetic resonance phenomena, and an ultrasonic CT device that uses ultrasound.

When a doctor makes a diagnosis using these various CT devices,
Usually, multiple tomographic images covering the tumor area are transmitted instead of one tomographic image.

Doctors take these multiple tomographic images and compare them with their anatomical knowledge in their heads to reconstruct the three-dimensional structure inside the human body.
It is diagnosing.

From the above, it can be understood that stereoscopic image display of the three-dimensional structure inside the human body is extremely advantageous for doctors' diagnosis.

Conventionally, various methods regarding three-dimensional display of multiple slices have been proposed.

For example, coordinate transformation processing, interpolation processing, and contour extraction processing are performed on image data obtained by a CT device.

There is a method of displaying images by performing contour area construction processing, hidden surface removal processing, etc. (hereinafter referred to as "pseudo three-dimensional display") (Takami Yasuda et al., [Surgical operation simulation using three-dimensional display of head CT images], Proceedings of the 23rd ME Society Conference, P
750~P 751. A.P.R.

1984).

However, in this method, the image data processing process is complicated, and large-scale and enormous hardware is required if high-speed display is to be performed.

Furthermore, even with the current image processing means, it is not always possible to expect stable operation for extracting the contours of organs, so there are cases where the image data of the underlying tomogram must be manually input, and it is not fully automatic. There is a problem.

1 A stereoscopic display method using a reprojection method has also been proposed. This method uses a three-dimensional V obtained from a CT multilayer surface.
The projected image is reconstructed by integrating the oxel (Volume element) in the line of sight direction, and stereo display is performed. (Yokoi Shigeki.

"Survey on three-dimensional display of X-ray CT images".

Information Processing Society of Japan, Computer Vision, 18-5.
1982, 5.20, L, D,
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As one of the means for confirming the image of the subject three-dimensionally, for example, PLZT (Pea Lanthan), which is a light shielding element, is used.
um Zirconate Titanate)
There is a method of using the element in a stereoscopic viewing glasses part.

FIG. 3 is a diagram explaining the principle of a three-dimensional television that uses this PLZT element to confirm a three-dimensional image of a subject.

In the figure, reference numerals 1a and 1b are optical shutters incorporated into the left eye and eyeglasses, respectively. Since the optical shutters 1a and 1b have the same configuration, one optical shutter 1
To explain about a, there is a PL between the two polarizing plates 2 and 3.
The optical shutter 1a is constructed by inserting the ZT elements 4 and bringing them into close contact with each other.

For the optical shutters 1a and 1b configured in this way, a voltage is applied to the shutters in synchronization with a switching signal for the left eye image and right eye image of the subject, which are alternately displayed on the display screen for each feed or for each reframe. The light is alternately supplied from the driving means (driving power source) 5, and the transmittance of light of the PLZT element 4, 4 is alternately switched, so that both the light shutters la and 1b are optically opened and closed. .

By using such optical shutters 1a and 1b as glasses and also utilizing the afterimage property of the eye, a three-dimensional image of the subject can be confirmed.

By the way, in such stereoscopic retevision, in order to perform stereoscopic viewing accurately, the left image of the subject is used.

The relationship between the switching timing of the left image and the driving timing of the optical shutters 1a and 1b is important. FIG. 4 shows the relationship between the vertical synchronization signal and the vertical deflection voltage in a CTR display. Vertical deflection voltage is generated in synchronization with the vertical synchronization signal, but the high level time (vertical non-display time) of this vertical synchronization signal is set to a predetermined time in relation to the video signal. and is not easy to change. On the other hand, the time required for opening and closing the shutters of liquid crystal glasses having the optical shutters 1a and 1b may be slightly longer than the vertical non-display time of a CRT display. . In such a case, even after the scanning of the sex image or the right image has started, the optical shirt is still in the process of transmitting light, resulting in a problem that stereoscopic viewing cannot be performed properly.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to provide a stereoscopic image display device that can accurately perform stereoscopic viewing through liquid crystal glasses. There is a particular thing.

[Summary of the Invention] The summary of the present invention for achieving the above object is to include a display unit that performs beam scanning for displaying an image based on the timing of the captured vertical synchronization signal, and a left eye image and a left eye image on the display unit. In a stereoscopic image display device that alternately displays images for the right eye and images for the left eye, a plurality of pulse signals are used as a set of synchronization signals.

The present invention is characterized in that it includes a timing control means for outputting to the display means every time the right eye image is switched.

[Embodiments of the invention] Hereinafter, the present invention will be specifically explained with reference to Examples.

FIG. 1 is a block diagram of a stereoscopic image display device according to an embodiment of the present invention. 10 is a video signal supply means, for example, V
It is an A/D (analog-digital) conversion means that converts a video signal (analog signal) transmitted from a TR device or the like into a digital signal, and 11 is an image memory that stores the output of this A/D conversion means 10. . 12 is a video data generating means for generating desired video data for display from the image data read out from the image memory 11, and 13 is a D/D converter for converting the output of the video data generating means 12 into an analog signal. A conversion means. 14 comprises, for example, a CRT, and uses beam scanning to scan the D/
This is a CRT display (display means) that visualizes the output of the A conversion means 13, and the display image of this CRT display 14 is provided for stereoscopic viewing. Further, 15 is a horizontal line superimposed on the video signal transmitted from the VTR device.

HV synchronization separation means separates the vertical synchronization signal @(H,V), and numeral 16 denotes a clock generation means for generating a clock pulse synchronized with the timing of the horizontal synchronization signal separated by the HV synchronization separation means 15. Reference numeral 17 denotes timing control means for generating various timing control signals based on the clock pulse outputted from the clock generation means 16 and the vertical synchronization signal outputted from the HV synchronization separation means 15 to control the operation timing of each block. be.

Specifically, the image data readout timing of the image memory 11, the video data generation timing of the video data generation means 12, the horizontal and vertical synchronization of the CRT display 14, and the liquid crystal glasses 1 of the shutter drive means 5.
The timing of voltage application to 8 is controlled. As already explained with reference to FIG. 3, the liquid crystal glasses 18 include optical shirts 1a and 1b whose light transmittance changes with the application of voltage.

Next, the operation of the embodiment device having the above configuration will be explained.

FIG. 2 is an operation timing chart of the embodiment device, and (a
) is the vertical dosing signal output from the timing control means 17, (b) is the vertical deflection voltage generated in the CRT display 14, (C) is the ON signal of the optical shutter la (for the right eye), and (d) is the ON signal of the optical shutter la (for the right eye). The state of the optical shutter 1a, (e) is the ON signal of the optical shutter 1b (for left eye), (f) is the state of the optical shutter 1b, and (g> is the display control signal output from the timing control means 17). Hikari X・Tsuta 1a.

It is assumed that 1b becomes transparent in the ON state and becomes black in the OFF state.

The device of this embodiment works in principle in the same manner as the conventional device and enables stereoscopic viewing through liquid crystal glasses 18, but is characterized by timing control by the timing control means 17. In other words, in contrast to the conventional device in which the vertical synchronizing signal was periodically captured into the CRT display one pulse at a time as shown in FIG.
As shown by V11°V12 and VZL V22 in the figure, two pulses are taken in periodically. When the vertical synchronizing signal is taken in in this way, the vertical deflection voltage of the CRT display 14 decreases at the rising timing of the first vertical synchronizing signal Vn (return line), starts rising at the falling timing of V+1, but the vertical deflection voltage of the CRT display 14 starts rising at the falling timing of V+1. Since the second vertical synchronizing signal V12 is input, the second vertical signal V+z does not reach the maximum value.
It decreases at the rising timing of . In other words, the first
This means that the time (non-display time) from the end of scanning of the feed (or first frame) to the start of scanning of the second feed (or second frame) is longer than in the conventional apparatus. Therefore, at the timing when scanning of a new feed (or frame) is started, the optical shutters la and lb of the liquid crystal glasses 18 are completely in the ON or OFF state.

When the optical shutter 1a is in the ON state and the optical shutter 1b is in the OFF state, the video data generation means 12 outputs video data for the right eye according to the display control signal output from the timing control means 17, and the output video data D/
The image is input to the CRT display 14 via the A conversion means 13 and displayed as a right eye image. Further, when the optical shutter 1a is OFF and the optical shutter 1b is ON, an image for the left eye is displayed on the CRT display 14 in the same manner as described above.

As described above, in the device of this embodiment, the first. Second vertical synchronization signal @Vn, V12 (also Vn, VZ2
) is output as a set of vertical synchronization signals to the CRT display 14 each time the left-eye image and the right-eye image are switched. Therefore, it becomes possible to accurately perform stereoscopic vision through the liquid crystal glasses 18.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above-mentioned embodiment, and can be modified as appropriate within the scope of the gist of the present invention. For example, in the above embodiment, the first. The explanation has been given of a case in which two pulse signals such as the second vertical synchronization signals Vn and VI2 (or VZL and V22) are periodically output to the CRT display 14 as a set of vertical synchronization signals. Even if the pulse signal is a set of vertical synchronization signals, the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a stereoscopic image display device that can accurately perform stereoscopic viewing through liquid crystal glasses.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a stereoscopic image display device which is an embodiment of the present invention, Fig. 2 is an operation timing diagram of the device of this embodiment, Fig. 3 is an explanatory diagram of the principle of a stereoscopic television, and Fig. 4 is FIG. 2 is a timing diagram of a vertical synchronization signal and a vertical deflection voltage in a CRT display of a conventional device. 14...CRT display (display means), 17...
- Timing control means. Agent Patent Attorney Nori Chika Yudo Norio Ogo 1b33

Claims (1)

[Claims] In a stereoscopic image display device, which has a display means for performing beam scanning for image display based on the timing of a captured vertical synchronization signal, and alternately displays left-eye images and right-eye images on the display means. , for stereoscopic viewing, comprising a timing control means for outputting a plurality of pulse signals as a set of synchronous signals to the display means each time the left eye image and the right eye image are switched. Image display device.