JPH0267895A - Method and device for reproducing stereoscopic video - Google Patents

Abstract

PURPOSE:To prevent flicker by outputting, reproducing and displaying right and left pictures inputted in a field sequence in a scanning line sequence on a picture display part. CONSTITUTION:The title device consists of a video source 1, a converter 2, a picture display part 3, a driving circuit 4 and a polarizing face rotating device. When parallax information corresponding to the right and left eyes of a whether is given alternately and made stereoscopic, the right and left pictures inputted in the field sequence are outputted, reproduced and displayed on the picture display part in the scanning line sequence. A general article is used as it is without reforming a monitor part and the flicker can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a time-sharing method and device for reproducing stereoscopic video by alternately giving corresponding parallax information to each of the left and right eyes of a viewer for stereoscopic viewing. In particular, the present invention relates to a screen scanning method suitable for preventing flickering on a video screen.

[Conventional technology]

The conventional 3D video playback device is Japanese Patent Application Laid-Open No. 6+-212190.
For example, when playing video input in the NTSC format, the image corresponding to left and right multi-viewing is set to 60Hz.
By switching with , flicker during field sequential playback was prevented.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, in order to switch at 60Hz the images that are inputted in left and right field sequentially in the NTSC system,
It was necessary to add various circuits to double the horizontal scanning frequency of the image display section (so-called monitor section) from the usual 15.75 KHz.

However, by doubling the standard TV broadcasting frequency of 30Hz,
Even if the switching was made at 0 Hz, there was an unavoidable tendency to experience flickering due to eye fatigue during IQ for a long time.

An object of the present invention is to provide a stereoscopic video playback method and device that completely prevents flickering by using a general-purpose product that can be used as a monitor for normal television broadcasting, etc., without making any particular modifications to the monitor section. That's true.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a time-sharing stereoscopic video reproduction method that alternately provides images with parallax information corresponding to each of the left and right eyes of a viewer for stereoscopic viewing. This paper proposes a three-dimensional video reproduction method in which images of the following three-dimensional images are sequentially outputted to an image display unit in scanning line order and reproduced and displayed.

The present invention also provides a time-sharing 3D video playback device that alternately provides images with parallax information corresponding to the left and right eyes of a viewer for stereoscopic viewing, and is capable of storing and retrieving image information of multiple screens at high speed. The present invention proposes a three-dimensional video reproducing apparatus comprising a device and a means for sequentially reading left and right image information stored in the storage device in field sequential order in scanning line sequential order and outputting the same to an image display section for reproduction and display.

The left and right image information stored in the storage device in field order may be read out in dot order and output to the image display section for reproduction and display.

These three-dimensional video playback devices can be applied to video conference systems, video telephones, and the like.

[Effect]

The NTSC video signal is quantized into nXm bit digital signals for each scanning line signal by an A/D converter. n is the number of pixels per horizontal scanning line; 2m is the amount of image information per pixel; in this case, the number of gradations is 2''''. The quantized image information is written to the storage element. The storage element has a storage capacity greater than the amount of information equivalent to four field screens, and repeatedly stores and reproduces image information in the manner described below.

In FIG. 2, first, the first odd field and even field screens are sequentially stored every m bits. Next, the second odd field and even field are stored in the same manner. At the same time, from the previously stored image information of odd and even fields, information corresponding to odd fields and information corresponding to even fields are alternately reproduced for each horizontal scanning line and sent to the D/A converter. D/A
The analog signal converted by the converter is sent to the image display section and becomes an image. NT that is first manually input to the A/D converter
In the SC signal, a left-eye image is assigned to either an odd field or an even field, and a right-eye image is assigned to the other field. Therefore, in the image display section 2, left-eye images and right-eye images are alternately displayed in the horizontal scanning line order. The scanning line signal sent to the D/A converter is stored at the speed (same as or an integer multiple) of the speed at which it is stored in the storage element.
is played. When the data is played back at a speed N times the storage speed, the playback is repeated N times while the odd and even field screens are read once each.

By rotating the plane of polarization of the image by 90° in synchronization with the horizontal scanning of the image on the display screen, it is possible to provide separate stereoscopic screens for the left and right eyes to the viewer's left and right eyes. This enables stereoscopic viewing.

Rotation of the polarization plane of the image is achieved by placing an electro-optical element made of PLZT ceramics or the like in front of the screen.

With the above means, the conventional flipping force that was required for switching between the left eye screen and the right eye screen for each field is reduced to switching at, for example, 15.75 kHz for each scanning line.
completely resolved.

〔Example〕

A schematic configuration of an embodiment of the present invention will be explained with reference to FIG.

The video source 1 receives and reproduces stereoscopic video, and is a tuner for receiving television broadcasting, a VTR, a video disc reading device, or the like, and reproduces images based on the NTSC system. Regarding the image signal output from the video source 1, a left eye image is provided in either the even field or the odd field.

The right eye image is assigned to the other one. The converter 2 has a built-in field memory, receives signals for odd field images and even field images, rearranges them in scanning line order so that odd field and even field signals are arranged alternately, and displays the signals on the image display section. Send to 3. At this time, the switching frequency of the field image received by the converter 2 is 60 Hz.

The number of horizontal scanning lines is 262.5, but the image signal from the converter 2 to the image display section 3 has a field image switching frequency of 60 Hz, and the number of horizontal scanning lines is 525. The scanning speed is NTSC
Repeat one field screen twice in twice the method. The instant circuit 4 rotates the polarization direction of the polarization plane rotation device 5 by 90' in synchronization with the horizontal scanning line number output signal of the converter 2.

In the case of this embodiment, vertical scanning is performed at twice the speed of the NTSC system, so the driving frequency of the polarization plane rotation device 5 is 31
．． It is 5kHz. The polarization plane of the image is changed by a polarization plane rotation device 5.
90' differs depending on whether the image is transmitted by the left eye or the right eye. Viewers can wear polarized glasses and view left- and right-eye images separately, allowing them to view stereoscopic images.

Next, the circuit configuration of the converter 2 will be explained with reference to FIG. The NTSC signal input from the video source 1 to the A/D converter 6 is quantized into a digital signal of, for example, 468 pixels per horizontal scanning line and 8 bits per pixel. This signal is input to the assigned storage elements 91, 92, 93, and 94 through path buffers 81, 82, 83, and 84, respectively. Each one of the four memory elements has an amount of information equivalent to one field on both sides of the input field, which is 265.5 in this embodiment.
X 468x 8 = has a storage capacity of 9,828,000 bits - Input to the storage element 9 is performed for one pixel, that is, one set of 8 bits, and each 8 bit is stored sequentially at the address specified by the address counter 10. Ru. After the address counter 10 counts from O to 1,228,499,
Return to O again and start counting. The clock 121 is
ON-〇FF outputs rectangular pulses with the same interval at a frequency of 30Hz, and the odd field is stored in 91 or 93.
An even field screen is signaled to the enable terminal of pass buffer 11 to be stored in 92 or 94. Reading out the image information stored in the memory element is performed using W of the memory element 9.
This becomes possible by turning on the /R terminal. When the clock 72 outputs a 30Hz control pulse to the W/R terminal,
When 91 and 92 are in the input state, 93 and 94 are in the output state, and this is alternately repeated for four fields at 15 Hz as one cycle. The output signal 2 is sent to the D/A converter 13, restored to an analog signal, and then sent to the image display section 3. The flow of data from the A/D converter 6 to the storage element 9 and from the storage element to the D/A converter 13 is controlled by the clock 7.
1 controls the path buffers 81, 82, 83, and 84. Also, when the memory element 9 is in the output state, the enable terminal of this element is ON-〇FF at 15.75 kHz.
9 times each time the image information for one horizontal scanning line is output.
Control is transferred to 1 or 892 or from 93 to 94.

A pulse signal that determines this output state is output from the clock 122. In this way, the right eye and left eye corresponding images received alternately in fields are outputted alternately in horizontal scanning lines.

Note that in this embodiment, the converter portion is entirely composed of logic circuit elements, allowing for miniaturization and high reliability.

Furthermore, although an example has been shown in which the left and right images are switched sequentially in scanning line order, it is also possible to switch the left and right images pixel by pixel.

By applying these 3D video playback devices to video conferencing systems and videophones, it is possible to play back vivid facial expressions not only in videos but also in still images.

〔Effect of the invention〕

In stereoscopic stereo images that display images for the left eye and right eye in a time-divided manner, both the transmission and recording methods
Due to the simplicity of the configuration, it is common to allocate left-eye or right-eye screens to the even and odd fields of the NTSC system. However, in the above method, 30H
Since screens are switched using z, a flicker problem occurs.

According to the present invention, the left-eye image and the left-eye image are switched at a high speed similar to the horizontal scanning frequency while maintaining compatibility with the NTSC system, so that the flicker problem is completely resolved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall configuration of an embodiment of the stereoscopic video reproduction device according to the present invention, FIG. 2 is a diagram explaining the function of the converter of the device shown in FIG. 1, and FIG. 3 is a diagram showing an example of the circuit configuration of the converter. FIG. DESCRIPTION OF SYMBOLS 1... Image source, 2... Converter, 3... Image display part, 4... Drive circuit, 5... Polarization plane rotation device, 6
... A/D converter, 7... Clock, 8... Pass buffer, 9... Storage element, 10... Address counter, 11... Pass buffer, 12... Clock,
13...D/A converter.

Claims (1)

[Scope of Claims] 1. In a time-sharing stereoscopic video reproduction method in which images with parallax information corresponding to each eye of a viewer are alternately given to the viewer's left and right eyes for stereoscopic viewing, the left and right images inputted in field sequence are scanned. A stereoscopic video playback method characterized by outputting to an image display unit line-by-line and playing back and displaying. 2. A time-sharing stereoscopic video playback device that alternately provides images with corresponding parallax information to each eye of the viewer for stereoscopic viewing, comprising: a storage device capable of high-speed storage/reading of image information of multiple screens; What is claimed is: 1. A stereoscopic video reproducing apparatus, comprising means for reading left and right image information stored in a storage device in field sequential order in scanning line sequential order and outputting the information to an image display section for reproduction and display. 3. A time-sharing stereoscopic video playback device that alternately provides images with corresponding parallax information to each of the viewer's left and right eyes for stereoscopic viewing, comprising: a storage device capable of high-speed storage/reading of image information of multiple screens; What is claimed is: 1. A stereoscopic video reproducing apparatus, comprising means for reading left and right image information stored in a storage device in field sequence in dot sequence and outputting it to an image display section for reproduction and display. 4. A television conference system comprising the stereoscopic video reproduction device according to claim 2 or 3. 5. A videophone comprising the stereoscopic video reproduction device according to claim 2 or 3.