JP2794099B2 - 3D image device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional image device,
In particular, it relates to an apparatus for generating a video signal from a stereoscopic image created by computer graphics.

[0002]

2. Description of the Related Art In computer graphics, an arbitrary object (virtual object) is set on three-dimensional world coordinates, and a viewpoint and a screen for the object are determined to calculate an image. A video signal is generated by reading out the memory storing the data of the image thus created. If the video signal is of the NTSC standard, it can be displayed on a general television device.

[0003] By creating two image data having a parallax between both eyes in a computer graphic and projecting an image from each image data to a video device for the right eye and a video device for the left eye, a stereoscopic image can be viewed.

Conventionally, in order to obtain such a stereoscopic image, two video signal generators for reading out image data from a memory of a graphic workstation and obtaining a video signal have been required.

[0005]

However, according to the above-mentioned conventional method, two expensive video signal generators are required, and there has been a problem that the cost of the entire apparatus is increased. The present invention has been made to solve the above problems, and an object of the present invention is to provide an apparatus for obtaining a stereoscopic image by computer graphics at a low cost.

[0006]

According to the present invention, there is provided a three-dimensional image display apparatus comprising: an object set in a world coordinate system of a graphic workstation; The length in the direction is reduced by half, these two images are arranged side by side in the horizontal direction to form one image, and the memory storing the image thus configured is used as the horizontal synchronizing signal of the video signal. The signal is read out while scanning in synchronization, and the readout signal for one horizontal scanning period is written in the first and second memories. The address is read while the address is advanced at a speed, and an address delayed by 1/2 horizontal scanning from the write start address is written from the second memory as the read start address. Read while advancing the address in half the rate of observed rate, and generates a video signal of the image to the eye of each of both eyes from thus read signal.

[0007]

According to the stereoscopic video apparatus of the present invention, one horizontal scanning image data of each of the right-eye image and the left-eye image is written in the first and second memories side by side during one horizontal scanning period. The read start address from the first memory is the write start address, and the read speed is １ ／ of the write speed.
Therefore, the data read during one horizontal scanning period is one horizontal scanning image data of the image for the right eye.

The read start address from the second memory is an address delayed by 1/2 horizontal scanning from the write start address, and the read speed is 1/2 of the write speed, so that the data read during one horizontal scan period is One horizontal scan image data of the image for the left eye.

In this manner, during one horizontal scanning period, one horizontal scanning image data for the right eye and one horizontal scanning image data for the left eye are read from the first and second memories, respectively, and a video signal is generated based on these signals. it can. By projecting the video signal, two images having parallax between the two eyes are obtained, and a stereoscopic image can be viewed by separately viewing the images with the right and left eyes.

The expansion board for reading image data from the memory of the graphic workstation may read only one image data, and the circuit for processing the read signal has a common part, so that the apparatus can be manufactured at low cost. it can.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main part of a stereoscopic video apparatus according to an embodiment of the present invention. An expansion board 1 for reading an image memory of a graphic workstation is provided with a horizontal synchronizing signal (15.7342 k, which is the same as the NTSC horizontal synchronizing signal).
Hz) and read out while scanning.

The graphic workstation has three image memories corresponding to R (red), G (green), and B (blue) colors, respectively. R, G, and B read from the respective memories are provided. Are output from the extension board 1.

The R analog signal output from the extension board 1 is amplified by the amplifier 2, the low-frequency component is removed by the low-pass filter 3, and converted into a digital signal by the A / D converter 4. The A / D converter 4 outputs a synchronization signal (4f _sc = 1) corresponding to the number of horizontal scanning pixels in the image memory frame to be read.
4.31818 MHz), and converts an input analog signal into a digital signal.

The digital signal output from the A / D converter is written into a first memory 5 and a second memory 6.
The write start address is updated in synchronization with the horizontal synchronization signal, and the write address is advanced in synchronization with the synchronization signal (4f _sc ). The data stored in the first memory is read out by advancing the address while synchronizing with a 2f _sc signal which is a half of the write address synchronizing signal. The read start address is the same as the write address, and the read start address is updated in synchronization with the horizontal synchronization signal.

The data stored in the second memory is read out by advancing the address while synchronizing with a signal of 2f _sc which is a half of the write address synchronizing signal. The read start address is an address delayed by 1/2 horizontal scanning from the write address, and is updated in synchronization with the horizontal synchronization signal and a signal having a 180 ° phase difference.

The signal read from the first memory is D /
The signal is converted into an analog signal by the A converter 7, a low-frequency component is removed by the low-pass filter 9, amplified by the amplifier 11, and input to the matrix mix circuit 13. Similarly, the signal read from the second memory is D / A
The signal is converted into an analog signal by a converter 8, a low-frequency component is removed by a low-pass filter 10, amplified by an amplifier 12, and input to a matrix mix circuit 14.

From the amplifier 2 to the amplifiers 11 and 12
Circuits similar to the circuits described above are also provided for the G and B analog signals, and the G and B analog signals are input to the matrix mix circuits 13 and 14 from these circuits. The matrix mix circuits 13 and 14 generate NTSC composite signals from the input R, G, and B analog signals, the same horizontal synchronizing signal as described above, and the vertical synchronizing signal from the expansion board 1, and respectively generate a liquid crystal for the right eye. Output to the display and left-eye liquid crystal display. These liquid crystal displays are HMD
(Head mounted display), which can be viewed separately by the right and left eyes while attached to the head.

The image memory of the graphic workstation has addresses corresponding to the pixels of the display, and the addresses can be represented on the screen of the display.
Since the number of horizontal scans on the screen is twice the number of horizontal scans on the NTSC, a memory corresponding to a quarter of the screen is used.

Data of two images viewed from two viewpoints in which an object set at the world coordinates of the graphic workstation is arranged so as to have parallax between both eyes is calculated. The length of each of the images in the horizontal direction is reduced to half, and the images of A and B are created and arranged side by side in the horizontal direction as shown in FIG.

The images of A and B are read as one image, and the data is read from the memory. The speed of reading from the first and second memories is 1 / the speed of the writing.
2, the matrix mix circuits 13 and 1
4 is a video signal of the NTSC standard output from FIG.
As shown in (b) and (c), the images of A and B are separated, and a normal perspective view in which the length in the horizontal direction is doubled is taken. Since these images have a parallax between the two eyes, a stereoscopic image is obtained by separately viewing the images with the left and right eyes.

The embodiment is configured as described above.
The invention is not limited to this. For example, instead of a color image,
The present invention can be applied to an apparatus for obtaining a black-and-white image.

[0022]

As described above, according to the stereoscopic video apparatus of the present invention, an extension board for reading out one image data can be used as an extension board for reading out image data from the memory of the graphic workstation. Since there is also a common part in the processing circuit, a device for viewing a three-dimensional image formed by computer graphics can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a main part of a stereoscopic video apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the relationship between images in the stereoscopic video apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Expansion board 2 Amplifier 3 Low-pass filter 4 A / D converter 5 1st memory 6 2nd memory 7 D / A converter 8 D / A converter 9 Low-pass filter 10 Low-pass filter 11 Amplifier 12 Amplifier 13 Matrix mix circuit 14 Matrix mix circuit

──────────────────────────────────────────────────続 き Continuation of front page (51) Int.Cl. ⁶ identification code FIG09G 5/36 510 G06F 15/62 350V (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 13/00-15 / 00 G06T 15/00 G09G 5/00-5/40

Claims (1)

(57) [Claims] 1. The horizontal length of each of two images viewed from two viewpoints in which an object set to world coordinates of a graphic workstation is arranged so as to have binocular parallax is reduced to １ ／. These two images are arranged side by side in the horizontal direction to form one image, and the memory storing the image thus configured is read out while scanning in synchronization with the horizontal synchronizing signal of the video signal. The signal for one horizontal scanning period is written to the first and second memories, and the read from the first memory is performed while the write start address is used as a read start address while the address is advanced at half the write speed, and the second memory is read. From then on, the address delayed by 1/2 horizontal scanning from the write start address is used as the read start address and the address is not advanced at half the write speed. A stereoscopic video apparatus characterized in that the stereoscopic video apparatus reads the image and generates a video signal of an image for each of the two eyes from the signal thus read.