JP2002027499A - Imaging apparatus and its controlling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an imaging apparatus of three-dimensional video for imaging an object by binocular parallax in which crosstalk, i.e., superposition of left and right videos, is prevented. SOLUTION: Video signals for left and right eyes are inputted while being delayed by a specified time through a delay circuit 110 to match the accumulation timing of a CCD 106 for a sync signal separated by a sync separation circuit 108 and switched for each field by opening/closing shutters 102a, 102b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup apparatus for picking up an object with binocular parallax in order to view a stereoscopic image, and a control method therefor.

[0002]

2. Description of the Related Art In a conventional imaging apparatus for imaging a subject with binocular parallax in order to appreciate a stereoscopic image,
2. Description of the Related Art A liquid crystal shutter is used as a shutter for switching a video signal for the left eye and a video signal for the right eye for image pickup input for each field.

In this liquid crystal shutter driving method, a synchronizing signal is separated from a video signal of an image pickup device, and an ODD / EVEN signal is generated from the synchronizing signal. And ODD /
Opening and closing are alternately performed by using the EVEN signal and its inverted signal as left and right liquid crystal shutter drive signals, respectively. FIG. 6 shows the configuration of this conventional example.

FIG. 6 is a diagram showing a configuration of a conventional example. In FIG. 6, reference numeral 601 denotes a lens unit of a stereoscopic video input camera for capturing an image with binocular parallax, and a mirror 603 for the left eye.
a, the right and left mirrors 603b, the prism 604, and the zoom lens 605 divide the optical axis to the left and right to form a two-lens system, so that time-division stereoscopic images of the left and right shutters 602a and 602b can be captured.

[0005] Reference numeral 606 denotes a CCD, which captures a stereoscopic image from a lens. Reference numeral 607 denotes an image processing circuit, and a CCD
The video signal Vout is created by processing the information in 606.

A sync separation circuit 608 extracts an ODD / EVEN signal (hereinafter, referred to as an O / E signal) from the video signal Vout.

Reference numeral 609 denotes an inverter which produces an inverted output of the O / E signal so that the normal rotation of the O / E signal is used as a drive signal for the left liquid crystal shutter and the inversion is used as a drive signal for the right liquid crystal shutter.

FIG. 7 shows signal waveforms at various parts in the conventional example. FIG. 7 is a timing chart showing signal waveforms of various parts of the conventional example. In FIG. 7, h denotes a vertical synchronizing signal Vsy.
nc, i is the signal of the accumulation time of the CCD of the imaging device,
j is an O / E signal output from the sync separation circuit, that is, a drive signal of the left liquid crystal shutter, and k is an inverted output signal of the O / E signal by the inverter, that is, a signal of the drive signal of the right liquid crystal shutter.

Here, a vertical synchronizing signal h is extracted from the video signal in a synchronizing separation circuit, and an O / E signal j, which is inverted every field, is generated therefrom. In a time-division stereoscopic video imaging device, it is necessary to switch between left and right video for each field, and thus a stereoscopic video system is configured by using the O / E signal j as a shutter drive signal.

[0010]

However, in the above-described conventional imaging apparatus, since the CCD is stored with some delay from the vertical synchronizing signal h, one field of the video signal starts before the field starts. In this case, the shutter is opened, which causes a problem of overlapping left and right images, that is, causing crosstalk.

That is, in a three-dimensional image, a difference occurs between the shutter opening / closing timing and the accumulation time, and the right image and the left image cannot be appropriately divided. And
Since the delay of the accumulation time of the CCD differs depending on the specifications of the imaging device, the difference between the shutter opening / closing timing and the accumulation time also differs depending on the imaging device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an imaging apparatus which prevents crosstalk in which left and right images overlap, and a control method therefor.

[0013]

An image pickup apparatus and a control method thereof according to the present invention are configured as follows.

(1) In a three-dimensional image pickup apparatus for picking up an object with binocular parallax, each shutter for switching a left-eye image signal and a right-eye image signal for image input for each field, and the image input Separating means for separating the synchronization signal from the separated video signal, and opening and closing control means for opening and closing the respective shutters by delaying the separated synchronization signal by a predetermined time so as to match the accumulation timing by the image sensor. I did it.

(2) In the image pickup apparatus of the above (1), the opening / closing control means controls the synchronization signal separated by the separating means when switching the shutter from the closed state to the open state and when switching the shutter from the open state to the closed state. Different time delays.

(3) In the image pickup apparatus of (2), the shutter is a liquid crystal shutter, and when any one of the liquid crystal shutters is switched from a transmissive state of an open state to a non-transmissive state of a closed state. When the liquid crystal shutter in the transmissive state is switched to the non-transmissive state before the accumulation start time of the next field, and any of the liquid crystal shutters is switched from the non-transmissive state to the transmissive state, The liquid crystal shutter in the non-transmissive state is switched to the transmissive state later than the field accumulation end time.

(4) In the image pickup apparatus of (3), a temperature sensor for detecting the temperature of the liquid crystal shutter and a correction means for correcting the timing of switching the liquid crystal shutter in accordance with the detected temperature are provided. did.

(5) In a control method of a three-dimensional image pickup apparatus for picking up an object with binocular parallax, each shutter for switching an image-input left-eye image signal and a right-eye image signal for each field; Separating means for separating a synchronizing signal from the video signal inputted and inputting the image, and opening and closing each of the shutters by delaying the separated synchronizing signal by a predetermined time so as to match the accumulation timing by the image pickup device I tried to make it.

(6) In the control method of the image pickup apparatus described in (5), when the shutter is switched from the closed state to the open state and when the shutter is switched from the open state to the closed state, the synchronization signal separated by the separating means is used. Different time delays.

(7) In the control method of the image pickup apparatus according to the above (6), the shutter is a liquid crystal shutter, and any liquid crystal shutter of the liquid crystal shutter is changed from a transmissive state, which is an open state, to a non-transmissive state, which is a closed state. When switching, the liquid crystal shutter in the transmission state is switched to the non-transmission state before the accumulation start time of the next field, and when switching any liquid crystal shutter of the liquid crystal shutter from the non-transmission state to the transmission state, The liquid crystal shutter in the non-transmissive state is switched to the transmissive state after the storage end time of the previous field.

(8) In the control method of the image pickup apparatus described in (7), the temperature of the liquid crystal shutter is detected by the temperature sensor, and the timing of switching the transmission state of the liquid crystal shutter in accordance with the detected temperature is corrected. I made it.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of an imaging apparatus according to an embodiment.

In FIG. 1, reference numeral 101 denotes a lens unit of a stereoscopic image input camera, which is an image pickup device for picking up images with binocular parallax, and includes a mirror 103a for the right eye and a mirror 10 for the left eye.
By splitting the optical axis on the left and right by the 3b, the prism 104, and the zoom lens 105, a two-lens system is obtained, and time-division stereoscopic images can be captured by the left and right shutters 102a and 102b.

Reference numeral 106 denotes a CCD, which captures a stereoscopic image from a lens. 107 is an image processing circuit, which is a CCD
A video signal (video signal) by processing the information of 106
Creating Vout.

Reference numeral 108 denotes a synchronization separation circuit (separation means) which converts a video signal Vout into a vertical synchronization signal Vsync,
Odd / even field identification signal ODD / E
A VEN signal (hereinafter, referred to as an O / E signal) is extracted.

Reference numeral 110 denotes a delay circuit, and Vsync, O
A drive signal for the left and right shutters for controlling the shutter open-to-close and close-to-open timings to appropriate values by delaying the / E signal by the open-to-close delay circuit 109a and the close-to-open delay circuit 109b, respectively. To form This drive signal is transmitted to the left and right shutters 102a, 102 of the stereoscopic video input camera.
b is the drive signal.

In the imaging apparatus having the above-described configuration, first, a three-dimensional image photographed by the lens unit 101 is a CC image.
The video signal is input through D106, and the video processing circuit generates a field-sequential video signal.

The video signal is supplied to the sync separation circuit 108.
The vertical synchronization signal a shown in FIG. 3 and the O / E signal b whose High and Low are inverted in accordance with the timing are taken out and input to the delay circuit 110.

In the delay circuit 110, first, the set CC
The O / E signal b is shifted so as to overlap the accumulation time of D106. Then, from the vertical synchronizing signal a, the closed → open delay circuit 1
09b, a pulse c for generating a close signal that is at least later than the accumulation end time g at the timing of closing and opening the liquid crystal shutter, and at the timing of opening and closing the liquid crystal shutter at the opening and closing delay circuit 109a. A pulse d for generating an open signal at least before the accumulation start time g is generated.

Then, a left liquid crystal shutter drive signal e and a right liquid crystal shutter drive signal f are generated from the output c of the close signal generation circuit, the output d of the open signal generation circuit, and the O / E signal b. Then, by using the left liquid crystal shutter drive signal e as the drive signal of the left liquid crystal shutter 101b and the right liquid crystal shutter drive signal f as the drive signal of the right drive shutter 101a, the left and right images are switched in a time division manner. In addition, by performing driving in accordance with the accumulation time (accumulation timing), a stereoscopic image system having no crosstalk between left and right images is configured.

Note that the delay circuit 110 is
An opening / closing control means for controlling the opening and closing of the liquid crystal shutters 101a and 101b by delaying the synchronization signal separated by 8 by a predetermined time so as to match the accumulation timing by the CCD 106.

FIG. 2 is a circuit block diagram showing a configuration of delay circuit 110 in FIG.

In FIG. 2, reference numeral 201 denotes an open signal generation circuit which outputs a signal having a pulse width determined by a value of a time constant determined by a capacitor 202 and a variable resistor 203 in response to an input of a vertical synchronization signal Vsync.

A closed signal generating circuit 204 outputs a signal having a pulse width determined by a time constant determined by the capacitor 205 and the variable resistor 204 in response to the input of the vertical synchronizing signal Vsync.

Reference numerals 207, 208, and 209 denote inverters, which invert and output the input. 210 and 211 are changeover switches, and 212 and 213 are flip-flops, which change the output and the shutter drive signal in response to a change in the input clock.

FIG. 3 is a timing chart showing signal waveforms of the respective circuits of FIG.

In FIG. 3, a is the vertical synchronizing signal Vsyn
c and b are O / E signals, c is an output signal of the closed signal generation circuit 204, d is an output signal of the open signal generation circuit 201, e is an output signal of the flip-flop 212, that is, a left liquid crystal shutter drive signal, and f is An output signal of the flip-flop 213, that is, a right liquid crystal shutter drive signal, g is an accumulation signal of the CCD 106 serving as an image sensor.

Hereinafter, the shutter opening / closing drive control operation will be described in detail with reference to FIGS.

First, the vertical synchronization signal Vsync is input to the open signal generation circuit 201 and the close signal generation circuit 204.
Capacitor 2 for determining time constant in open signal generation circuit 201
02. Output a signal d in which a pulse exists at a position shifted from the vertical synchronization signal Vsync by a time determined by the variable resistor 203.

That is, the signal d sets the delay time (T ₂ in FIG. 3) for closing and opening the liquid crystal shutter. Then, using this signal as a clock for flip-flop 212, and flip-flop 213, the closing → opening delay signal signal at the end of T ₂ by input to the inverter 207 so want to switch at the end of one pulse T ₂ of the d Is inverted, so that the closed-to-open delay signal d is inverted.

A signal c in which a pulse exists at a position shifted from the vertical synchronization signal Vsync by a time determined by the capacitor 205 and the variable resistor 206 for determining the time constant in the close signal generation circuit 204 is output. That is, the signal c sets the delay time (T ₁ in FIG. 3) between the opening and closing of the liquid crystal shutter.

Then, this signal is supplied to the flip-flop 21
2, and used as the clock of the flip-flop 213, open → we want switched 1 end pulse T ₁ of the closing delay signal c so that the signal rises at the end of T ₁ by input to the inverter 208 open → closed The delay signal c is inverted.

On the other hand, the O / E signal and the inverted output of the inverter 209 are applied to the changeover switch 210 and the changeover switch 211, and are input to the flip-flops 212 and 213 corresponding to the left and right shutters.

The output from the open signal generation circuit side, that is, closed →, is supplied to the flip-flop 212 and the flip-flop 213 depending on the state of the O / E signal and its inverted output.
The open delay signal d and the output from the close signal generation circuit, that is, the waveform of the open → close delay signal c are input as clocks.
That is, when the O / E signal and its inverted output are low, a closed-to-open delay signal d is input as a clock, and when the O / E signal is high, an open-to-closed delay signal c is input as a clock.

In the flip-flop 212, when the O / E signal is low, the shutter close → open delay signal d is selected, latched at the rising edge of the pulse (falling edge of the close / open delay signal d), and the left liquid crystal shutter The drive signal is L
ow, that is, an OPEN signal is output.

When the O / E signal is High, the shutter open → closed delay signal c is selected and latched at the rising edge of the pulse (the falling edge of the open → closed delay signal c) to drive the left liquid crystal shutter. The signal is High, that is, a CLOSE signal is output.

In the flip-flop 213, when the inverted output of the O / E signal is Low, the shutter close → open delay signal d is selected, and the rising edge of the pulse (close → open delay signal d) is selected.
, And the right liquid crystal shutter drive signal is Low, that is, an OPEN signal is output.

When the O / E signal is high, the shutter open → closed delay signal c is selected, latched at the rising edge of the pulse (the falling edge of the open → closed delay signal c), and the right liquid crystal shutter is driven. The signal is High, that is, a CLOSE signal is output.

Therefore, the drive signals of the left and right liquid crystal shutters are not transmitted through the liquid crystal shutter before the accumulation start time of the next field of the image pickup device (CCD 106) from open to close, and the drive signals before and after the image pickup device (CCD 106) from close to open. The liquid crystal shutter can be made to be in a transmissive state after the field accumulation end time.

FIG. 4 is a flowchart showing the above-described shutter opening / closing control operation. Note that this operation is not shown in FIG.
C based on the program stored in the OM
Performed by the PU.

First, the processing operation of each step will be briefly described.

In step S401, a processing operation for starting the delay control of the liquid crystal shutter drive signal is performed.

In step S402, the vertical synchronizing signal Vsy
A processing operation of repeating a loop until an nc pulse comes is performed.

In step S403, a processing operation for starting a timer serving as a reference for the delay time is performed.

In step S404, the liquid crystal shutter is opened.
This is a processing operation for setting a closing delay time (using a loop from the timer start).

In step S405, a processing operation is performed to determine where the O / E signal is now.

In step S406, since the signal is an ODD signal, a processing operation for outputting a drive signal for opening and closing the right liquid crystal shutter is performed.

In step S407, since the signal is the EVEN signal, a processing operation of outputting a drive signal for opening and closing the left liquid crystal shutter is performed.

In step S408, the liquid crystal shutter is closed.
The processing operation of setting the opening delay time (using a loop from the timer start) is performed.

In step S409, a processing operation is performed to determine where the O / E signal is now.

In step S410, since the signal is an ODD signal, a processing operation of outputting a drive signal for closing and opening the right liquid crystal shutter is performed.

In step S411, since the signal is the EVEN signal, a processing operation of outputting a drive signal for closing and opening the left liquid crystal shutter is performed.

In step S412, a processing operation for stopping the timer is performed.

In step S413, the vertical synchronizing signal Vsy
A processing operation for terminating the routine for one pulse of nc is performed.

Hereinafter, the processing operation described above will be described in detail.

First, in step S401, delay control of the liquid crystal shutter drive signal is started. Next, in step S402, Vsync = 1, that is, the vertical synchronization signal Vsync becomes H
When it becomes igh, the count of the timer is started in step S403.

Next, the delay time from opening to closing of the liquid crystal shutter set by the timer in step S404 (T ₁ in FIG. 3).
Is repeated until the condition is satisfied, and if the condition is satisfied, it is determined in step S405 which of the O / E signals is present. If the determination result is ODD, the right liquid crystal shutter drive signal is changed from open to closed in step S406, that is, the drive signal is set from low to high.

If the judgment result is EVEN, step S4
At 07, the left liquid crystal shutter drive signal is changed from open to closed, that is, the drive signal is set from Low to High. Next, the loop control is repeated until the delay time (T ₂ in FIG. 3) for closing and opening the liquid crystal shutter set by the timer in step S408, and if the condition is satisfied, O / E is determined in step S409.
Determine where the signal is.

If the determination result is ODD, step S41
At 0, the left liquid crystal shutter drive signal is changed from closed to open, that is, the drive signal is set from High to Low. The judgment result is E
If it is VEN, the right liquid crystal shutter signal is changed from closed to open in step S411, that is, the drive signal is changed from High to Low.
Set to.

Next, in step S412, the counting of the timer is stopped. Then, in step S413, the control for delaying the drive signal of the liquid crystal shutter by 1 V, that is, the control for one pulse of the vertical synchronization signal Vsync is completed.

By repeating these series of controls (60 times per second), a drive signal for the liquid crystal shutter is generated.

As described above, in the above embodiment, the shutter device for switching the left and right images for each field delays the opening / closing drive of the shutter so as to be suitable for the accumulation time of the image sensor, and separates the opening and closing of the shutter. The timing is changed to change the duty of the time between the open state and the closed state, and the drive signal of the left and right shutter devices is non-transparent at least before the accumulation start time of the image sensor when opening → closing, and the accumulation ending time of the image sensor when closing → opening. By setting the transmission state at least before, the shutter drive suitable for the accumulation time can be performed in any imaging device, and a stereoscopic image without a left and right image stroke can be provided.

FIG. 5 is a diagram showing the configuration of an image pickup apparatus according to one embodiment. The case where the liquid crystal shutter is driven and controlled using a temperature correction circuit will be described with reference to FIG.

In FIG. 5, reference numeral 501 denotes a lens unit of a three-dimensional image input camera which captures images with binocular parallax. The right and left mirrors 503 a, 503 b, prism 504, and zoom lens 505 make the optical axis to the left and right. Are divided into two lenses, and the left and right shutters 502
A and 502b can capture a time-division stereoscopic video.

Reference numeral 506 denotes a CCD, which captures a stereoscopic image from a lens. Reference numeral 507 denotes a video processing circuit, and a CCD
The video signal Vout is created by processing the information in 506.

Reference numeral 508 denotes a synchronization separation circuit which converts the video signal Vout from the vertical synchronization signal Vsync, ODD / EVE.
An N signal (hereinafter referred to as an O / E signal) is extracted.

A temperature sensor 509 measures the temperature of the liquid crystal shutter in order to check the characteristics of the liquid crystal shutter.

Reference numeral 510 denotes a temperature correction circuit (correction means) which outputs correction data to a liquid crystal shutter whose characteristics change depending on temperature.

Reference numeral 511 denotes a delay circuit, and Vsync, O
/ E, open / close and close → open timing of the shutter from the temperature correction data of the liquid crystal shutter to an appropriate value →
The drive signal for the left and right shutters is formed by delaying by the close delay circuit 512a and the close → open delay circuit 512b. This drive signal is transmitted to the left and right shutters 502a and 502b of the stereoscopic video input lens.
Drive signal.

In the imaging apparatus having the above-described configuration, first, a three-dimensional image photographed by the lens unit 501 is formed by a CCD.
The video processing circuit 506 generates a field-sequential video signal. Then, the video signal is input to the sync separation circuit 508, and the vertical sync signal Vsync and High and L are synchronized with the timing.
The O / E signal whose ow is inverted is taken out, and a delay circuit 511 is provided.
To enter.

The characteristics of the liquid crystal shutter depend on the temperature. That is, it opens according to the temperature of the liquid crystal shutter.
The response time of each of closing and closing → opening changes. Therefore, the temperature of the liquid crystal shutter is measured by the temperature sensor 509,
The temperature correction circuit 510 outputs data on the response time of the liquid crystal shutter at that temperature.

Then, the vertical synchronizing signal Vsync, O / E
The signal and the temperature correction data are input to the delay circuit 511. First, the O / E signal is shifted by the delay circuit 511 so as to match the set accumulation time of the CCD.

Then, from the vertical synchronizing signal Vsync and the temperature correction data, a signal is provided by the open-to-close delay circuit 512a so as to be at least earlier than the accumulation start time in consideration of a change in response time when the liquid crystal shutter is opened-to-closed. produce. Similarly, from the vertical synchronizing signal Vsync and the temperature correction data, the close-to-open delay circuit 512b generates a signal that is at least later than the accumulation end time in consideration of a change in response time when the liquid crystal shutter is closed to open.

Then, drive signals for the left and right liquid crystal shutters are generated from the O / E signal. These signals are used as drive signals for the right liquid crystal shutter 502a and the left liquid crystal shutter 502b.

As described above, in the above embodiment, the temperature of the left and right shutter devices is measured, and the shutter drive signal is corrected under any condition by correcting the change in characteristics due to the temperature change. It became possible to do.

[0086]

As described above, according to the present invention,
In a stereoscopic image capturing apparatus that captures an image of a subject with binocular parallax, each shutter for switching between a left-eye video signal and a right-eye video signal to be imaged and input for each field, and synchronization from the imaged and input video signal A separation means for separating the signals, and an opening and closing control means for opening and closing the respective shutters by delaying the separated synchronization signals by a predetermined time so as to match the accumulation timing by the image sensor; There is an effect that crosstalk in which images overlap can be prevented.

Further, the switching control means delays the synchronization signal separated by the separation means by a different time when switching the shutter from the closed state to the open state and when switching the shutter from the open state to the closed state. This has the effect of reliably preventing crosstalk in which the left and right images overlap.

The shutter is a liquid crystal shutter, and when any of the liquid crystal shutters is switched from the open state, which is a transmission state, to the closed state, which is a non-transmission state, the shutter starts from the accumulation start time of the next field. If the liquid crystal shutter in the transmission state is switched to the non-transmission state before, and any of the liquid crystal shutters is switched from the non-transmission state to the transmission state, the non-transmission state may be set after the accumulation end time of the previous field. Since the liquid crystal shutter in the transmissive state is switched to the transmissive state, there is an effect that the left and right images can be more reliably prevented from crosstalk.

Also, since the temperature sensor for detecting the temperature of the liquid crystal shutter and the correction means for correcting the timing of switching the liquid crystal shutter in accordance with the detected temperature are provided, the opening / closing timing due to the temperature change of the liquid crystal shutter is provided. This has the effect that crosstalk in which the left and right images overlap with each other can be reliably prevented even under conditions where the temperature changes.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment.

FIG. 2 is a circuit block diagram illustrating a configuration of a delay circuit according to one embodiment;

FIG. 3 is a timing chart showing signal waveforms of respective circuits in FIG. 2;

FIG. 4 is a flowchart showing a shutter opening / closing control operation according to an embodiment;

FIG. 5 is a diagram showing a configuration of an embodiment.

FIG. 6 is a diagram showing a configuration of a conventional example.

FIG. 7 is a timing chart showing signal waveforms of various parts of a conventional example.

[Explanation of symbols]

 Reference Signs List 101 Lens unit 102a, 102b Shutter 103a, 103b Mirror 106 CCD (image sensor) 108 Synchronization separation circuit (separation means) 109a Open → close delay circuit 109b Close → open delay circuit 110 Delay circuit (open / close control means)

Claims (8)

[Claims] 1. An image pickup apparatus for stereoscopic images for imaging a subject with binocular parallax, comprising: a shutter for switching image signals for left and right eyes to be input for each field; Separating means for separating a synchronization signal from an input video signal; and opening and closing control means for opening and closing each of the shutters by delaying the separated synchronization signal by a predetermined time so as to match the accumulation timing by the image sensor. An imaging device, comprising: 2. The switching control means delays the synchronization signal separated by the separation means by a different time when switching the shutter from the closed state to the open state and when switching the shutter from the open state to the closed state. The imaging device according to claim 1. 3. A shutter is a liquid crystal shutter, and when switching any liquid crystal shutter of the liquid crystal shutter from a transmissive state, which is an open state, to a non-transmissive state, which is a closed state, the shutter starts from the accumulation start time of the next field. If the liquid crystal shutter in the transmission state is switched to the non-transmission state before, and any of the liquid crystal shutters is switched from the non-transmission state to the transmission state, the non-transmission state may be set after the accumulation end time of the previous field. 3. The imaging device according to claim 2, wherein the liquid crystal shutter in the transmission state is switched to the transmission state. 4. The imaging apparatus according to claim 3, further comprising a temperature sensor for detecting a temperature of the liquid crystal shutter, and a correction unit for correcting a timing at which the liquid crystal shutter is switched according to the detected temperature. . 5. A control method for a stereoscopic video imaging apparatus for imaging a subject with binocular parallax, comprising: a shutter for switching between left-eye and right-eye video signals to be imaged and input for each field; Separating means for separating a synchronizing signal from the video signal inputted and inputting the image, and delaying each of the shutters by a predetermined time with respect to the separated synchronizing signal so as to match the accumulation timing by the image sensor. A method for controlling an imaging device, characterized by opening and closing. 6. The synchronous signal separated by the separating means is delayed differently when the shutter is switched from the closed state to the open state and when the shutter is switched from the open state to the closed state. Control method of the imaging device. 7. A shutter is a liquid crystal shutter, and when switching any of the liquid crystal shutters from a transmissive state, which is an open state, to a non-transmissive state, which is a closed state, the shutter starts from the accumulation start time of the next field. If the liquid crystal shutter in the transmission state is switched to the non-transmission state before, and any of the liquid crystal shutters is switched from the non-transmission state to the transmission state, the non-transmission state may be set after the accumulation end time of the previous field. 7. The method according to claim 6, wherein the liquid crystal shutter in the transmission state is switched to the transmission state. 8. The control of the image pickup apparatus according to claim 7, wherein the temperature of the liquid crystal shutter is detected by a temperature sensor, and the timing of switching the transmission state of the liquid crystal shutter is corrected according to the detected temperature. Method.