JPH0478237B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides a video signal suitable for use in so-called stereoscopic video devices that can view images displayed on a cathode ray tube (hereinafter referred to as CRT) in three dimensions. It relates to a processing device.

BACKGROUND ART FIG. 4 is a block diagram showing the structure of a conventional stereoscopic video signal 1. This stereoscopic imaging device 1 has a pair of left and right imaging devices 2L and 2R. The imaging devices 2L and 2R are locked. The right video signal from the right imaging device 2R and the left video signal from the left imaging device 2L are alternately switched every vertical synchronization period by the video switch means 3, and the CRT
4 Display on top. An optical shutter device 6 is arranged between the CRT 4 and the human eye 5. The optical shutter device 6 includes a right shutter 6R corresponding to a human right eye 5R and a left shutter 6L corresponding to a left eye 5L. The oscillator 7 oscillates with a period of one vertical synchronization period, and the operations of the imaging devices 2R, 2L, video switch means 3, and shutters 6R, 6L are as follows.
It is driven in synchronization with the oscillation signal of this oscillator 7.
Note that the right shutter 6R and the left shutter 6L perform opening and closing operations alternately. For example, focusing on a certain vertical period, the captured image is guided to the CRT 4 via the right imaging device 2R and the video switch means 3,
The right image is displayed on the CRT4. At this time, the right shutter 6R is in the open state and the left shutter 6L is in the closed state, so that the right image is visible only to the observer's right eye 5R. Similarly, in the next vertical period, only the left image displayed on CRT 4 will be displayed on left eye 5.
Visualized by L. This enables stereoscopic viewing.

FIG. 5 shows the optical axes 1 and 2 of the imaging devices 2R and 2L.
An example of an image taken when are parallel is shown. Since the images captured by the right imaging device 2R are both the object N and the object F located on the left side of the optical axis 1 of the right imaging device 2R, the objects N and F are captured on the left side of the screen as indicated by reference numeral 50R. Ru. Furthermore, the image photographed by the left imaging device 2L is
Since it is located on the right side of the optical axis 2 of L, the reference mark 50
The image is captured on the right side of the screen as indicated by L.

Generally speaking, when we consider how we as humans see objects, when we gaze at object N,
It can be seen that there is a difference in how the image appears when gazing at object F.

FIG. 6 is a diagram showing the positional relationship of images when observing object F. When we humans gaze at the object F, the object F is visually recognized as one. That is, normally the optical axis 3 of the right eye 5R and the optical axis 4 of the left eye 5L
are the connections between the object F and the left and right eyes 5R and 5L, respectively. At this time, the image on the retina is 5
The images are formed at locations recognized as the same location in R and 5L. In other words, since the images are formed at a position that is recognized as the same position, it appears as one image.
The image visually recognized by the right eye 5R at this time is
The left image indicated by reference numeral 51R in FIG. 81 and viewed by the left eye 5L is indicated by reference numeral 51 in FIG.
Indicated by L. As is clear from the images 51R and 51L, the object F is located at the same position in both the left and right images, and the object N is located at different positions.

Further, the positional relationship when observing the object N is shown in FIG. The right image visually recognized by the right eye 5R at this time is indicated by reference numeral 52R in FIG. 82,
The left image viewed by the left eye 5L is indicated by reference numeral 52L in FIG. 82. When the object N is gazed at, the object N is visually recognized as one object, the object N is displayed at the same position in both the left and right images, and the object F is displayed at a different position. In this way, images captured by the imaging devices 2R and 2L of the conventional stereoscopic imaging device 1 are always fixed because the optical axes 1 and 2 are parallel; 8 As shown in Figure 2, the human eye actually sees the object F,
The positional relationship when looking at each of N is different in each case. Therefore, it is not possible to obtain an image viewed under natural visual conditions. In order to solve such a problem, it is conceivable to shift the optical axes 1 and 2 of the imaging devices 2R and 2L. For example, by aligning the optical axes 1 and 2 of the imaging devices 2R and 2L with the line connecting the imaging devices 2R and 2L and the object F, or by aligning the optical axes with the line connecting the imaging devices 2R and 2L and the object N, This is a method of making the optical axis variable. In such a method, it is sufficient that the images are displayed at the same position on the screen, so it is not necessary to display them at the center of the screen. In such a method, the range of the object that appears to be gazed at on the image is limited depending on the shooting conditions. For example, when the left and right images taken with the optical axis aligned with the object N during imaging are played back using the optical shutter device 6, the object N is played back at the same position, but the object F is at a different position. will be played. It is extremely easy to perform the action of gazing at the object N on the screen under these photographing conditions. However, the action of gazing at the object F on the playback screen is inevitably unnatural, and the object F may not be recognized as a single object.

Problems to be Solved by the Invention In summary, it is desirable to display images that correspond to a wide range of human visual characteristics so that images with binocular parallax can be viewed in a natural visual state regardless of the shooting conditions. It had been.

The purpose of the present invention is to solve the above-mentioned technical problems,
An object of the present invention is to provide a video signal processing device that can obtain images that correspond to a wide range of human visual characteristics.

Means for Solving the Problems The present invention provides means for recording image data corresponding to one horizontal scanning line of a video signal pixel by pixel, address generation means for generating an address for the recording means, and horizontal scanning of image data. means for setting a start position according to the distance of the subject from the imaging device; and when reading/writing the video signal to the recording means in response to the output from the horizontal scanning start position setting means;
The present invention is a video signal processing device characterized by comprising: means for changing the output start time of the address signal of the address generating means.

Effects According to the present invention, in response to the output from the horizontal scanning start position setting means, when reading/writing image data corresponding to one horizontal scanning line of a video signal to the recording means, the address from the address generating means is output. The start time of signal output changes. As a result, the horizontal scanning position of the image data can be made variable, and therefore images that correspond to a wide range of human visual characteristics can be displayed.

Embodiment FIG. 1 is a block diagram showing the electrical configuration of an embodiment of the present invention. The stereoscopic video device 29 is provided with a pair of left and right imaging devices 30R and 30L. The right imaging device 30R and the left imaging device 30L are in a genlock state, and therefore the horizontal synchronization signal H
The phases of the vertical synchronizing signal V and the vertical synchronizing signal V are aligned. A right video signal R having right side image data of the subject 31 from the right imaging device 30R is provided to the multiplexer 32. On the other hand, the left video signal L having left image data regarding the subject 31 of the left imaging device 30L is applied to the multiplexer 32 and also to the synchronous separation circuit 33. The synchronization separation circuit 33 separates the vertical synchronization signal V and the horizontal synchronization signal H. The separated vertical synchronization signal V is given to an inverter circuit G20. This inverter circuit G2
The output of 0 is the clock input terminal CK of the D-type flip-flop (hereinafter referred to as flip-flop) FF1.
given to. Flip-flop FF1 divides the frequency of the vertical synchronizing signal V by 1/2 and outputs the result.

The output from the output terminal Q of the flip-flop FF1 is applied to the multiplexer 32 as the multiplexer switching signal B shown in FIG. 32, is applied to the optical shutter device 36 as the shutter drive signal C shown in FIG. It is applied to address generator 35b. flipflop FF
The output from the inverted output terminal 1 is applied to the input terminal D and also to the address generator 35a.

The horizontal synchronization signal H from the synchronization separation circuit 33 is D
A clock input terminal CK of a type flip-flop (hereinafter referred to as flip-flop) FF2 and a multiplexer 37 are individually supplied. Flip-flop FF2 divides the frequency of the horizontal synchronizing signal H by 1/2 and outputs it. Output terminal Q of flip-flop FF2
The output from is given to address generator 35b. On the other hand, in the multiplexer 32, the switching mode is alternately changed every vertical synchronization period W1 by the signal B shown in FIG. A video signal in which the data and left image data are arranged alternately is obtained, and this video signal is given to the analog/digital converter 38, where it is converted into digital data and the line memories 39a and 39
given to b. The line memories 39a and 39b alternately read and write image data corresponding to one horizontal scanning line of the video signal S in pixel units. The image data is temporarily stored in the line memories 39a, 3
9b and then read out. In addition, line memory 39a and line memory 39
b operates in a complementary manner; for example, when line memory 39a is writing, line memory 39b is outputting image data. In other words, it is an exchange buffer system. An address signal from an address generator 35a is applied to this line memory 39a, and writing/reading of the line memory 39a is performed. Similarly, an address signal is applied from the address generator 35b to the line memory 39b, and writing/reading of the line memory 39b is thereby performed.

The address generators 35a and 35b are configured so that the generation position of the read address with respect to the horizontal synchronizing signal H can be made variable, that is, the horizontal scanning start position can be made variable. Note that the address generators 35a, 35b are given data regarding variable amounts from the address start position setting means 40, and thereby the address generators 35a, 35
The horizontal start position of the image data stored in b can be individually set at the time of reading. In this way, the address generator 35a at the time of reading,
By changing the output start time of the address signal of 35b, it is possible to make the displayed image of either the left image or the right image, or each of the right image and the left image variable. It is possible to obtain an image that corresponds to the visual characteristics of the image.

The multiplexer 37 synchronizes with the horizontal synchronizing signal H, line memory 39a and line memory 39b.
Switch the output between digital/analog converter 4
1, convert it to analog data and output it to CRT42.
Output to. As a result, image data is displayed on the CRT 42. The optical shutter device 36
is interposed between the human eye 43 and the CRT 42. The shutter device 36 includes a right shutter 36R corresponding to a human right eye 43R and a left shutter 36L corresponding to a left eye 43L. The right shutter 36R and the left shutter 36L alternately open and close in response to the drive signal C every vertical period W. The right image
When displayed on CRT42, right shutter 36
R is open and the left shutter 36L is closed. Therefore, the right image is visible only to the right eye 43R. On the other hand, when the left image is displayed on the CRT 42, the right shutter 36R is closed and the left shutter 36L is open. Therefore, the left image is visible only to the left eye 43L. Therefore, the subject 31 can be viewed three-dimensionally. Moreover, since the display position can be arbitrarily moved in the horizontal scanning direction by the address start position setting means 40, it is possible to view a stereoscopic image with a sense of realism regardless of the imaging conditions.

FIG. 2 is a block diagram showing the specific structure of address generators 35a and 35b. The horizontal synchronizing signal H is individually input to a positive edge detection circuit 60, a negative edge detection circuit 61, and a D-type flip-flop FF2. The output of the flip-flop FF2 is inverted between high and low levels every horizontal synchronizing signal H, and alternates between high and low levels every horizontal period. The output of this flip-flop FF2 becomes the image data read/write signal Y shown in FIG. are generated alternately.
The negative edge detection circuit 61 detects a negative edge of the horizontal synchronizing signal H shown in FIG. 3 and outputs a reset signal F shown in FIG. 3.
The reset signal F from the negative edge detection circuit 61 is sent to the reset terminals of the counters 63 and 64.
Given to Reset. In addition, the reset signal F is
The display clock inhibit signal K shown in FIG.
This becomes one input of the NAND gate G10.
When the output of NAND gate G9 becomes low level, the output of AND gate G10 always becomes low level, and as a result, input of the display clock to counter 64 is prohibited. Furthermore, the reset signal F
is input to one of the NAND gates G1 of the display clock generation circuit 80. The display clock generation circuit 80 includes a NAND gate G1, an inverter circuit G2 . G3, resistors R1, R2, R3, and capacitor C1. Reset signal F
The generated phase of the display clock generating circuit 80 is initialized by the input.

The counter 63 starts counting upon the rise of the reset signal F. The output of the counter 63 serves as one input of matching circuits 67 and 68, and is compared with data from the address start position setting means 40 of latch circuits 69 and 70, respectively.
AND gates G4 and G5 when the comparison values match
, outputs a high level signal. AND gates G4 and G5, inverter circuit G6, and OR
The gate G7 constitutes a multiplexer 71. This multiplexer 71 is switched by the output B from flip-flop FF1.
When the left video signal L is selected as a result, the output of the matching circuit 68 is given to the OR gate G7,
When the right video signal R is selected, the matching circuit 6
The output of 7 is given to OR gate G7. moreover
The output of OR gate G7 becomes one input of multiplexer 72. The multiplexer 72 is
AND gates G11, 12 and inverter circuit G
14 and an OR gate G13. The other input of this multiplexer 72 is
The positive edge signal of the horizontal synchronizing signal H from the positive edge detection circuit 60 is input to the input terminal of the AND gate G11, and is selected by the image write/read signal Y which is the output of the flip-flop FF2. This becomes the input for G9. When the input of NAND gate G9 becomes high level, the output of latch circuit 80 is inverted, the prohibition of clock input to counter 64 controlled by AND gate G10 is released, and counter 64 starts counting up operation. Start.

In this way, the latch circuit 65 is reset at the falling edge of the horizontal synchronizing signal H, and the timing of address generation is changed by selecting the latch inversion timing in each case.

The operation will be explained with reference to FIG. Figure 3 1
3 shows the vertical synchronizing signal V, FIG. 3 shows the selection signal B of the multiplexer 32, FIG. 3 shows the shutter drive device C, and FIG. 3 shows the horizontal synchronizing signal H.
FIG. 3 shows the reset signal F, and FIG. 3 shows the reset signal F.
6 shows the clock inhibit signal K, and FIG. 3 shows the image data read/write signal Y. During the left video signal output period Wa, the fall of the horizontal synchronizing signal H is detected at time t1, and the reset signal S shown in FIG. 5 is output. This initializes the address generators 35a and 35b. That is, counters 63 and 64 are reset. Further, at time t1, the clock inhibit signal K is lowered,
It rises at time t2 after the clock prohibition period Wc.
This period Wc is larger than the width of the horizontal synchronizing signal H, and no address signal is output from the address generators 35a, 35b during this period Wc. An address signal is output from time t2 after the clock prohibition period Wc has elapsed, and therefore, for example, left image data of the address generator 35a is read out from time t2 to time t3. Therefore, the image related to the first horizontal scanning line of the left image is displayed on the CRT 42 while moving in the horizontal scanning direction. In the next image data writing period, the clock inhibit period Wc is the same as the width of the horizontal synchronizing signal, so the left image data is stored in the address generator 35a without shifting in the horizontal scanning direction. Note that reading/writing is also performed on the address generator 35b in the same manner as the address generator 35a. Such an operation is performed during one field period Wa of the left video signal.

Next, during the output period Wb of the right video signal, the clock inhibit period Wc is set to have the same width as the horizontal synchronizing signal H regardless of whether image data is read/written. Therefore, the right image is displayed on the CRT 42 without shifting in the horizontal scanning direction.
In this way, the clock inhibit period Wc is set to have the same width as the horizontal synchronizing signal when writing data, and when displaying the left video signal when reading data.
By individually setting the right video signal when displaying it, a natural image can be viewed stereoscopically.

In the above embodiment, the output of the address signal is delayed when reading image data, but it may be delayed when writing.

Furthermore, in the above embodiment, only the left image was moved and displayed in the horizontal scanning direction, but only the right image was displayed.
Alternatively, the left and right images may be moved.

Effects As described above, according to the present invention, since the horizontal scanning start position can be made variable, the visual characteristics that were conventionally determined by the shooting conditions can be changed arbitrarily, and images having a wide range of visual characteristics can be created. It is possible to display images with a more natural and realistic feeling.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the electrical configuration of an embodiment of the present invention, and FIG. 2 shows address generators 35a, 3.
3 is a signal waveform diagram for explaining the operation, and FIG. 4 is a block diagram showing the configuration of the conventional stereoscopic image device 1.
FIG. 5 is a diagram showing the positional relationship of images taken when the optical axes 1 and 2 of the imaging devices 2R and 2L are parallel;
FIG. 6 is a diagram showing the positional relationship of images when gazing at object F, FIG. 7 is a diagram showing the positional relationship when gazing at object N, and FIG. 8 is a diagram showing the positional relationship when gazing at object N. FIG. 3 is a diagram showing an image state. 29...Stereoscopic video device, 31...Subject, 30
R, 30L...imaging device, 32, 37...multiplexer, 33...synchronous separation circuit, 35a, 35
b...Address generator, 39a, 39b...Line memory, 40...Address start position setting means.

Claims (1)

[Scope of Claims] 1. A video signal processing device that displays a plurality of subjects located at different distances from an imaging device on a screen as images with binocular parallax to enable stereoscopic viewing, comprising: means for recording image data corresponding to a scanning line pixel by pixel; address generating means for generating an address for the recording means; means for setting a horizontal scanning start position of image data according to a distance from an imaging device to a subject; When reading/writing the video signal to the recording means in response to the output from the horizontal scanning start position setting means,
A video signal processing device comprising: means for changing the output start time of the address signal of the address generating means.