JPH08317432A - Image pickup device - Google Patents

Abstract

PURPOSE: To perform every kind of measurement and adjustment correctly by excluding the fluctuation of luminance level of an image pickup output signal by storing the output of an image pickup means after the reset of a synchronizing signal for image pickup means driving and the lapse of prescribed time. CONSTITUTION: The vertical frequency of the vertical signal(VD) of a signal displayed on an image display device 2 is detected by always inputting to an image pickup device 1. While, the vertical scanning frequency of an image pickup system is decided by deciding the format of a CCD camera 8. Next, the vertical scanning signals of two signals and delay quantity from a display system VD required for the acquisition of an image pickup signal in which the fluctuation of luminance level is eliminated from the detected position of a display image picked up by the CCD camera 8 are calculated, and a synchronizing signal is reset by supplying the delay quantity calculated from the timing of the display system VD, and it is supplied to the CCD camera 8, then, the image pickup of the display image is performed. Also, the image pickup output signal after the lapse of prescribed time after a reset operation is stored in frame memory 11. Therefore, the image pickup output signal without generating the fluctuation of the luminance level is obtained in real time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup device for picking up a test pattern signal displayed by the image display device when setting up the image display device.

[0002]

2. Description of the Related Art FIG. 17 is a technical report Vo of the Television Society.
l. 18, No. 19, PP. 11-16 (1994)
2 is a block diagram showing an example of the configuration of the conventional image pickup device shown in FIG. 1, which is a video projector (hereinafter, referred to as a V projector) as an image display device in a conventional image distortion correction device.
P) is used, it shows the configuration of the circuit for removing the variation in the brightness level of the image pickup signal generated by the asynchronous scanning of the projection image of the VP and the image pickup unit for picking up the projection image. When a multi-scan (auto scan) VP projection image is captured, since the video signal projected by the VP has various scanning frequency (hereinafter, referred to as format) signals, the VP projection image and the imaging unit Since the format is often different, the brightness level of the image pickup signal fluctuates due to the asynchronous scanning of the projected image of the VP and the image pickup unit, and it becomes impossible to accurately adjust the VP. Therefore, it is necessary to remove the fluctuation in the brightness level of the image pickup signal.

FIG. 18 is a diagram for explaining the operation of a conventional image pickup device. Now, the vertical scanning frequency of the video signal projected by the VP is fv _SIG , and the screen image is captured C
If the vertical scanning frequency of the CD camera is fv _CCD , VP
When the vertical scanning frequency of the projection signal is higher than the vertical scanning frequency of the image pickup output signal, that is, when there is a relationship of fv _SIG > fv _CCD , the VP video signal changes the first field as shown in FIG. Since the signal charges of the CCD of the CCD camera are transferred at the stage of scanning and further scanning to the area indicated by A in FIG. 18B of the second field, the CCD
The image pickup output signal of the camera is the first as shown in FIG.
The area indicated by A in the field is double-exposed, and the luminance signal level in this double-exposed area is higher than that in the other areas. At this time, the brightness of the area A is double that of the other areas. Further, as the field progresses, the double-exposed area sequentially moves as shown in A → B → C → D shown in FIG. 18, so that the luminance level varies for each field.

Further, when the vertical scanning frequency of the VP projection signal is more than twice the vertical scanning frequency of the image pickup output signal, that is, when there is a relationship of fv _SIG > 2 × fv _CCD , A
Area is a triple exposure area, and the other area is a double exposure area. At this time, the luminance ratio between the area A and the other areas is 3: 2. Also, the position of the triple exposure region sequentially moves as the field advances. As mentioned above, CC
The level of the image pickup output signal of the D camera appears as a change in the brightness ratio, causing a change in the brightness level, which makes it impossible to perform accurate VP adjustment.

Conversely, when the vertical scanning frequency of the VP projection signal is lower than the vertical scanning frequency of the image pickup output signal, that is,
In the case of the relationship of fv _SIG <fv _CCD , FIG.
As shown in (d) and (e), since the signal charge of the CCD of the CCD camera is transferred before the scanning of the first field of the video signal of the VP is completed, the imaging output is the first field of the video signal. The signal is missing in the rest of the area, that is, in the area indicated by E in FIG. Also, as the field progresses, the missing part of this signal is shown in FIG.
Since it moves sequentially as E → F → G → H shown in (e), the brightness level of the image pickup signal fluctuates in the form of a region with a signal and a region without a signal. Therefore, it becomes impossible to accurately adjust the VP.

In consideration of the brightness level fluctuation characteristics of the image pickup signal as described above, the circuit shown in FIG. 17 removes the brightness level fluctuation of the image pickup signal. Frame memory 11
The imaged image data of one field before which the brightness level varies is stored in the. Brightness level fluctuation removal method is
By comparing the data value of the previous field (data in the frame memory 11) with the data value of the current field for each pixel, and determining the level fluctuation removal output of the image pickup signal, a signal having no brightness level fluctuation is detected. Output. The MAX / MIN detection circuit 51 compares the data values.

The operation of the MAX / MIN detection circuit 51 is fv.
Determined by the relationship between _SIG and fv _CCD . When the vertical scanning frequency of the image signal projected by the VP is higher than the vertical scanning frequency of the CCD camera, that is, fv _SIG >
In the case of fv _CCD , the MAX / MIN detection circuit 51 compares the data value in pixel units between consecutive frames, judges the smaller data as a true value, and feeds back the output to the next frame. . As a result, even if the imaging signal becomes a double (triple) exposed region, this region is removed.

On the other hand, when these frequencies have an inverse relationship, that is, when fv _SIG <fv _CCD , MAX /
In the MIN detection circuit 51, when comparing the data values in pixel units, the larger data value is determined to be a true value, and the output is fed back to the next frame. As a result, even if a region where the image pickup signal is missing comes, this region is removed.

As described above, it is possible to eliminate the variation in the brightness level of the image pickup signal caused by the difference between the video signal format projected by the VP and the format of the CCD camera for picking up the test signal displayed on the screen. The same image pickup signal as when the projection image) and the image pickup system (the image picked up by the CCD camera) are synchronized is obtained, and as a result, the VP can be accurately adjusted.

However, in this apparatus, since it is necessary to capture many frames until the image capture output signal of the CCD camera becomes a normal captured image with no fluctuation in the brightness level, it takes time to obtain the image capture data. There is a problem.

FIG. 19 is a block diagram showing another configuration example of the conventional image pickup device disclosed in Japanese Patent Laid-Open No. 30544/1993, which is different from the above-mentioned conventional example. Is. This display photographing apparatus includes a display 10 that displays a captured image (test pattern).
0, a CCD camera 8 for picking up an image (test pattern) displayed on the display 100, a measuring device 200 for processing an image picked up by the CCD camera 8, and a controller 300 for controlling the display 100 and the CCD camera 8. It The display 100
Can be regarded as an adjusted set, and a video signal generating circuit 10 for generating a video signal (test pattern) corresponding to a sync signal input from the external sync signal input terminal 101.
The video signal output by 2 is output and displayed on the CRT 103.

The CCD camera 8 is a C that can be externally driven synchronously.
Using a CD camera, in synchronization with the sync signal input from the external sync signal input terminal 14, the display 100 (CR
Image displayed on (T103) (test pattern)
The charge is accumulated on the CCD imager 81 in the CCD camera 8, the image displayed on the display 100 is photographed by this, and the output signal is output to the measuring device 200.

The measuring device 200 includes a frame memory 11 for storing video data input from the CCD camera 8,
The arithmetic unit 201 is configured to arithmetically process the data stored in the frame memory 11. Note that, although not shown in FIG. 19, at this time, an A / A that converts the image pickup output signal of the CCD camera 8 which is an analog signal into digital data
A D conversion circuit is installed, and the video data is stored in the frame memory 11 via the D conversion circuit.

The controller 300 receives inputs from a camera synchronization generation circuit 301 that generates a synchronization signal for driving the CCD camera 8, an address counter 302 and an address counter 302 that count horizontal synchronization signals output from the camera synchronization generation circuit 301. Memory (RAM) 303 that outputs data corresponding to the address that is set, the CPU 12 that sets a predetermined count value in the address counter 302 and stores the predetermined data in the memory 303, and a composite synchronization signal that is supplied to the display 100. It is composed of a synchronization generating circuit 304 for generating.

FIG. 20 is a diagram for explaining the operation of the conventional image pickup device. The composite sync signal output from the sync generation circuit 304 is input to the video signal generation circuit 102 of the display 100. The video signal generation circuit 102 generates a predetermined video signal (test pattern) in synchronization with this composite sync signal and outputs it to the CRT 103. As a result, a predetermined image (test pattern) is displayed on the CRT 103.

On the other hand, the horizontal synchronizing signal (hereinafter referred to as HD) and the vertical synchronizing signal (hereinafter referred to as VD) output from the synchronizing generation circuit 301 are CC'ed from the external synchronizing signal input terminal 14.
It is supplied to the D camera 8, and the CCD camera 8 captures an image (test pattern) displayed on the display 100 (CRT 103) in synchronization with this synchronization signal. CC
The image signal captured by the D camera 8 is measured by the measuring device 200.
And is stored in the frame memory 11 as a data value via the A / D conversion circuit. The arithmetic unit 201 processes the data stored in the frame memory 11 and measures various characteristics of the display 100 (CRT 103), for example, convergence error. Further, the CPU 12 stores in the memory 303 data corresponding to the difference between the vertical scanning frequency supplied by the synchronization generating circuit 301 to the CCD camera 8 and the vertical scanning frequency supplied by the synchronization generating circuit 304 to the display 100. That is, FIG.
As shown in (c), the period corresponding to the difference between the vertical scanning period of the CCD camera 8 (FIG. 20 (a)) and the vertical scanning period of the display 100 (FIG. 20 (b)) is logical L, and other periods. Data that is logical H is stored for the period.

The address counter 302 is the synchronization generating circuit 3
The HD input from 01 is counted, and the address corresponding to the count value is output to the memory 303. Also,
The count value of the address counter 302 is reset every time VD is input from the synchronization generating circuit 301. As a result, the memory 303, as shown in FIG.
Immediately after the vertical scanning cycle of the CD camera 8 is started, a signal of logic L is output to the CCD camera 8 for a period corresponding to the difference between the vertical scanning cycles of the display 100 and the CCD camera 8.

In the CCD camera 8, when the signal supplied from the memory 303 is logic L, the CCD imager 8
The operation of rapidly discharging the electric charge of 1 is performed, and imaging is performed only during the period when this signal becomes logic H. As a result, the data imaged by the CCD imager 81 is as shown in FIG. The image of the A field on the display 100 is captured in the area from the middle of the CCD imager 81 to the bottom of the screen. Then display 100
Although the display of the image of the B field is started at this time, this image is sequentially captured from the uppermost part of the CCD imager 81, and the first field of the CCD camera 8 ends. As a result, the image of the B field is displayed above,
The data in the state where the image of the A field is displayed below is output as the image pickup signal of the first field of the CCD camera 8.

Next, when the second field of the CCD camera 8 is started, the charge of the CCD imager 81 is rapidly discharged while the signal supplied from the memory 303 is logic L, and the charge is supplied from the memory 303. When the applied signal returns to logic H, the image pickup of the B field image on the display 100 is started. Since the second field of the CCD camera 8 is not finished even after the display of the B field is finished, an image of the C field of the display 100 that follows is captured, and the second field of the CCD camera 8 is finished. As a result, the image of the second field of the CCD camera 8 is such that the image of the C field is displayed above and the image of the B field is displayed below.

Further, in the third field of the CCD camera 8, the image of the D field of the display 100 is taken. In this case, display 100 and CCD
Since the VD of the camera 8 occurs at the same time, the CCD camera 8
The image of the third field of is only the image of the D field. Thereafter, similarly, images of each field displayed on the display 100 are sequentially picked up by the CCD camera 8.

Since the data picked up by the CCD imager 81 is read out at a normal speed, the data shown in FIG.
It becomes as shown in. That is, an image having a constant brightness can be obtained in each of the first field to the fifth field. As a result, in the measurement apparatus 200, for example, it is possible to prevent erroneous measurement of brightness, so that various adjustments of the display 100 can be correctly performed.

[0022]

However, when the vertical scanning frequency of the CCD camera 8 is higher than the vertical scanning frequency of the display 100, that is, under the relationship of fv _SIG <fv _CCD , the display 100 and the CCD camera 8 are not connected. VD
21 and the output signal of the first field of the CCD camera 8 ends in the middle of the A field of the display 100. Therefore, in the area a shown in FIG. You won't get it. (Becomes a no signal area.) Hereinafter, as the field of the CCD camera 8 advances, the areas where the image pickup signal cannot be obtained are b, c, d, ...
・ It will be moved sequentially as shown in the figure, and the luminance measurement will not be performed correctly. Therefore, various adjustments of the display 100 cannot be performed correctly.

Further, in the case of enlarging and capturing a partial area of the image displayed on the display 100, when the vertical scanning frequency of the CCD camera 8 is higher than the vertical scanning frequency of the display 100, that is, fv _SIG > fv _CCD . Below, since the image displayed on the display 100 is captured at the correct brightness level without any problem, the display 1
However, if the vertical scanning frequency of the CCD camera 8 is lower than the vertical scanning frequency of the display 100, that is, fv
Under the relationship of _SIG <fv _CCD , the image pickup area of the CCD camera 8 may overlap with a no-signal area where an image pickup signal cannot be obtained, and at this time, correct measurement of the display 100 and correct various adjustments cannot be performed.

The present invention has been made to solve the above problems, and the video signal format displayed by the image display device is different from the video signal format of the camera which captures the display image. In this case, it is an object of the present invention to obtain an image pickup device capable of eliminating various fluctuations in the brightness level of an image pickup output signal and performing various correct measurements and adjustments.

[0025]

An image display apparatus according to claim 1 of the present invention is an image pickup apparatus for picking up a test signal displayed by the image display apparatus when performing setup adjustment of the image display apparatus. A vertical scanning frequency of a signal displayed by the image display device, a vertical scanning frequency of the image capturing device, and an image pickup device for picking up an image of the test signal displayed by the image display device, Calculating means for calculating a predetermined time determined from the three inspection positions in the displayed image, and for driving the image pickup means after a predetermined time delay calculated by the calculating means from the vertical synchronizing signal of the signal displayed by the image display device There is provided a sync signal generating means for resetting and outputting the sync signal, and a storage means for storing the output of the imaging means after a predetermined time has elapsed after resetting the sync signal for driving the imaging means. It is intended.

An image display apparatus according to a second aspect of the present invention is the image pickup apparatus according to the first aspect, wherein the vertical scanning frequency of the signal displayed by the image display apparatus and the vertical scanning of the image pickup means are performed. The distribution of the brightness level fluctuations generated in the imaging output signal is calculated from the frequency, and then the distribution of the brightness level fluctuations and the inspection position in the image displayed by the image display device are displayed on the image display device. A synchronization signal creating means for calculating a predetermined time from the vertical synchronization signal of the signal to resetting the synchronization signal for driving the image pickup means and resetting and outputting the synchronization signal for driving the image pickup means with the predetermined time as a delay time. It is a thing.

Further, the image display device according to claim 3 of the present invention, when performing setup adjustment of the image display device,
In an image pickup device for picking up a test signal displayed by the image display device, an image pickup means for picking up an image of the test signal displayed by the image display device is provided, and a vertical synchronization signal of a signal displayed by the image display device. At the timing of resetting the synchronizing signal for driving the image pickup means and outputting the synchronizing signal, and storing means for storing the output of the image pickup means after a lapse of a predetermined time after resetting the synchronizing signal for driving the image pickup means. is there.

An image display device according to a fourth aspect of the present invention, when performing setup adjustment of the image display device,
In an image pickup device for picking up a test signal displayed by the image display device, the image pickup device picks up an image displayed by the image display device and the image pickup device at the timing of a vertical synchronization signal of the signal displayed by the image display device. A synchronizing signal generating means for resetting and outputting the driving synchronizing signal and a storage means for storing the output signal of the image pickup means, and a vertical scanning frequency of a signal displayed by the image display device, and the image pickup means. For compensating for the vertical scanning frequency, the inspection position in the image displayed by the image display device, and the distribution of the luminance level fluctuations of the output signal of the image pickup means, which are determined by the temporal position of the output frame of the image pickup means. A brightness correction signal creating means for creating a brightness correction signal and a correction means for performing brightness correction of the output signal of the image pickup means by the output signal of the brightness correction signal creating means. It is intended to.

Further, the image display device according to claim 5 of the present invention, when performing the setup adjustment of the image display device,
In an image capturing device that captures a test signal displayed by the image display device, an image capturing device that captures an image displayed by the image display device, and a frequency detecting device that detects a vertical scanning frequency of a signal displayed by the image display device. And, and
The delay time from the vertical synchronizing signal of the signal displayed by the image display device is displayed by the vertical scanning frequency of the signal displayed by the image display device, the vertical scanning frequency of the image pickup means, and the display of the image display device. As a predetermined time calculated from the three of the inspection positions in the image, a synchronization signal generating method of resetting and outputting the synchronization signal for driving the image pickup means and the timing of the vertical synchronization signal of the signal displayed by the image display device are used. A synchronization signal generating means for performing both operations of a method of resetting and outputting a synchronizing signal for driving the image pickup means, and a storage means for storing the output of the image pickup means after a lapse of a predetermined time after resetting the synchronizing signal for driving the image pickup means The operation method of the synchronizing signal generating means is switched according to the output of the frequency detecting means.

An image display device according to a sixth aspect of the present invention, when performing setup adjustment of the image display device,
An image pickup device for picking up a test signal displayed by an image display device, comprising: image pickup means for picking up an image displayed by the image display device; and storage means for storing an output signal of the image pickup means. The vertical scanning frequency of the displayed signal, the vertical scanning frequency of the image pickup means, the inspection position in the image displayed by the image display device, and the temporal position of the output frame of the image pickup means of the image pickup means. A brightness correction signal creating means for creating a brightness correction signal for compensating the distribution of the brightness level fluctuation of the output signal, a correction means for correcting the brightness of the output of the image pickup means by the output signal of the brightness correction signal creating means, and an image. Sync signal creating means for performing an operation of resetting and outputting the sync signal for driving the imaging means at the timing of the vertical sync signal of the signal displayed by the display device, And a frequency detecting means for performing a display to have a vertical scanning frequency detection of the image display apparatus, an image capturing apparatus characterized by switching the output of the imaging means to be stored in the storage means by the output of the frequency detecting means.

[0031]

In the image pickup device according to the first aspect of the present invention, the VD of the signal displayed by the image display device is always input to the image pickup device, and the vertical scanning frequency of this VD is detected. On the other hand, the vertical scanning frequency of the image pickup system is determined by determining the format of the CCD camera. Next, the vertical scanning frequency of the two signals and the display necessary to create the CCD camera driving VD necessary to obtain the image pickup signal without the brightness level fluctuation from the detection position of the display image picked up by the CCD camera. The delay amount from the system VD is calculated and generated by resetting the sync signal for driving the CCD camera with the delay amount calculated from the timing of the display system VD.
It is supplied to the D camera and a display image is captured. Further, the imaging output signal after a predetermined time has elapsed from the reset is stored in the frame memory. As a result, it is possible to obtain the image pickup output signal in real time without fluctuation in the brightness level.

In the image pickup device according to the second aspect of the present invention, the VD of the signal displayed by the image display device is always input to the image pickup device, and the vertical scanning frequency of this VD is detected. On the other hand, the vertical scanning frequency of the image pickup system is determined by determining the format of the CCD camera. First, the brightness level distribution in the image pickup output signal of the CCD camera is calculated from the vertical scanning frequencies of the two signals. Next, a display necessary to create a CCD camera driving VD required to obtain an image pickup signal without a change in the luminance level from the calculated luminance level distribution information and the detection position of the display image captured by the CCD camera. The delay amount from the system VD is calculated, and the delay amount calculated from the timing of the display system VD is added to C.
It is generated by resetting the synchronization signal for driving the CD camera, and is supplied to the CCD camera to capture a display image.
Further, the imaging output signal after a predetermined time has elapsed from the reset is stored in the frame memory. As a result, it is possible to obtain the image pickup output signal in real time without fluctuation in the brightness level.

In the image pickup device according to claim 3 of the present invention, the image display device is an NTSC signal, PAL /
When displaying a SECAM signal or an HDTV signal, the image pickup system has an NTSC camera, PAL / SECAM, respectively.
By using a camera or HDTV camera, it is possible to match the vertical scanning frequencies of the display system and the imaging system,
In addition, in principle, if the VDs are completely synchronized, the brightness level of the image pickup output signal does not change. Therefore, by resetting the CCD camera driving VDs at the timing of the display system VDs, the two are synchronized and the CCD cameras are synchronized. A drive synchronization signal is created and supplied to a CCD camera to capture a display image. As a result, it is possible to obtain an image pickup output signal that does not fluctuate in brightness level in real time.

In the image pickup device according to claim 4 of the present invention, the vertical scanning frequency of the video signal displayed by the image display device, the vertical scanning frequency of the CCD camera, and the inspection of the image displayed by the image display device are performed. Position, and CC
CCD from the four positions of the temporal position of the output frame of the D camera
A distribution of luminance level fluctuations in the image pickup output signal of the camera is calculated. In this way, the brightness correction signal necessary for compensating the brightness level fluctuation can be created. Therefore, when the image pickup output signal is modulated by the luminance correction signal, the luminance level fluctuation can be removed from the image pickup output signal.

Further, in the image pickup device according to the fifth aspect of the present invention, the display image of the image display device displaying the signal of the same vertical scanning frequency as the vertical scanning frequency of the signal of the image pickup system is picked up. In this case, a method of creating a synchronization signal for driving an imaging camera (a method of creating by resetting with a display system VD),
A method for creating a synchronization signal for driving an imaging camera (when calculating a predetermined delay amount, when capturing a display image of an image display device displaying a signal of a vertical scanning frequency different from the vertical scanning frequency of the signal of the imaging system, A CCD camera drive synchronization signal creation circuit that has both the method of resetting with the delay amount) is installed, and the vertical scanning frequency of the signal displayed by the display system is detected, and the camera drive is performed according to the detection frequency. By switching the method of creating the synchronization signal and selecting the optimum imaging method according to the display system signal, it is possible to always remove the fluctuation in the brightness level from the imaging output signal.

Further, in the image pickup device according to claim 6 of the present invention, when the vertical scanning frequencies of the display system and the image pickup system are different from each other, the distribution of luminance level fluctuations is calculated, and a luminance correction signal is created to generate luminance. When the method for removing the level fluctuation and the vertical scanning frequency of the display system and the imaging system match, the display system V
A method of removing the fluctuation in the brightness level of the imaging output by resetting the imaging system VD at the timing of D is installed,
The optimum scanning method is selected by detecting the vertical scanning frequency of the signal displayed by the display system and switching the scanning method according to the detected frequency. As described above, the fluctuation in the brightness level of the image pickup output signal caused by the difference in the vertical scanning frequency is removed.

[0037]

【Example】

Example 1. First Embodiment FIG. 1 is a block diagram showing the configuration of an image pickup device according to a first embodiment of the present invention. A CRT VP is used as an example of an image display device. In the figure,
2 is a CRT type VP which is an adjusted set, and 4 is a VP
This is a screen on which the second image is projected. In addition, 1 captures an image projected from the VP 2 on the screen 4,
Moreover, the image pickup device is for performing various adjustments of the VP2. The image pickup device 1 is composed of the following elements. 3 is an interface circuit for communicating between the VP 2 and the image pickup device 1, 8 is a CCD camera for picking up an arbitrary region on the screen 4, and 6 and 7 are two devices installed to move the image pickup region of the CCD camera 8. Each axis motor, 9
Is a motor control unit that controls and drives the motors 6 and 7, 10 is an A / D conversion circuit that converts the output signal of the CCD camera 8 into digital data, and 11 is an A / D conversion circuit 10.
A frame memory for storing the output data of the CPU, a CPU 12 for processing the data stored in the frame memory 11 and various controls of the image pickup device 1, and a synchronization 13 for creating HD and VD for driving the CCD camera 8. Generation circuit, 14
Is a sync signal input terminal created by a sync generation circuit 13 provided in the CCD camera 8, 18 is a circuit for detecting a vertical cycle of a video signal projected by the VP 2, 16 is a motor controller 9, a frame memory 11, Interface circuit 3, C
A bus connecting the PU 12, the synchronization generation circuit 13, and the vertical cycle detection circuit 18, and 17 is a VD input terminal of the video signal projected by the VP2. The same reference numerals as those used in the description of the conventional example are the same components.

FIG. 2 is a timing chart for explaining the operation of the image pickup apparatus according to the first embodiment of the present invention, showing the relationship between the VD of the projected image of the VP2 and the driving VD of the CCD camera 8. There is. In the figure, t _PV is VP2
This is the time for one field of the projected image of, and is detected by the vertical cycle detection circuit 18. t _CV is the time of one field of the imaged image signal of the CCD camera 8, and shows an example in which the vertical scanning frequency of the projected image of the VP 2 is higher than the vertical scanning frequency of the CCD camera. In addition, T _W is CCD
This is the time until the PLL circuit inside the camera 8 stabilizes. During this period, the image pickup output signal of the CCD camera 8 is not used as the image pickup prohibition period. Furthermore, T _C1 , T
_C2 is the accumulation time of the CCD for becoming the image output signals of the first and second fields of the CCD camera 8, and the signals accumulated during the periods of T _C1 and T _C2 are the image signals of the first and second fields, respectively. It is output as output 1 and output 2 from the CCD camera 8.

Here, the CCD camera 8 is a frame-accumulation CCD camera which can be driven externally and is driven at the NTSC rate. Therefore, the vertical scanning frequency of the image pickup output signal of the CCD camera 8 is 59.94 Hz, and t _CV is 16.683 mSec.

Generally, when the vertical scanning frequency of the video signal becomes low, flicker (flickering) becomes conspicuous on the screen. Therefore, the vertical scanning frequency in various currently existing video formats and various computer signal formats is P.
A frequency of about 50 Hz for AL / SECAM, 60 Hz for NTSC, or higher (about 70 to 80 Hz) is used. Therefore, a video signal format having a vertical scanning frequency of 1/2 of NTSC does not actually exist, but the image capturing apparatus of the present invention uses a CCD camera that performs a frame accumulation operation, so that the vertical scanning frequency of NTSC can be increased. If the vertical scanning frequency is 29.97 Hz or more, which is ½ of the above, the configuration is applicable. In the following description, the vertical scanning frequency of the image projected by the VP2 is 29.
For the sake of simplicity, the image projected by the VP2 has an arbitrary frequency of 97 Hz or higher, and the luminance of the screen is a constant signal over the entire surface.

Next, the operating principle of the embodiment of the present invention will be described with reference to FIG. C at a certain timing of VD of the video signal projected by VP2 (time is T ₀ ).
The VD for driving the CD camera 8 is reset, and this time point is used as the reference point on the time axis. Here, the CCD camera 8 requires a time until the PLL circuit inside the camera is stabilized (T _W is 4 vertical cycles in this embodiment) because the VD input from the external synchronization input terminal 14 is reset. Therefore, the screen can be imaged from the time point T ₀ after the time T _W. The signal accumulated in the CCD of the CCD camera 8 is output as the video signal of the first field of the CCD camera 8 during the period T _C1 following T _W. The first field signal (output 1) of the CCD camera 8 is a signal in a period from a ₁ to b ₁ on the time axis when viewed at the timing of the signal of VP2, and when viewed as an imaging output signal, as shown in FIG. a)
, The area from the top of the screen to the position a ₁ ,
The area from the position b ₁ to the bottom of the screen is a dark area (however, the brightness level of the dark area is not zero), and the area between a ₁ and b ₁ is a bright area, and the brightness level fluctuates within the screen. It becomes a thing. At this time, since the bright area is subjected to triple exposure and the dark area is subjected to double exposure, the brightness ratio between the bright area and the dark area is 3: 2.

Subsequently, when the signal of the second field (output 2) of the CCD camera 8 which is the output of the signal accumulated in the CCD during the period of T _C2 is seen at the timing of the signal of VP2,
The signal in the period from the time a ₂ to the time b ₂ is obtained, and the image pickup output signal becomes a signal in which the brightness level variation exists in the bright area and the dark area as in the first field as shown in FIG. 3B. The brightness ratio between the bright area and the dark area is 3: 2 because it becomes a triple exposure area and a double exposure area as in the output 1 of the first field. However, the vertical position which is the boundary between the bright area and the dark area in the screen is different from the first field.

From the above, the output signal of the i-th field of the CCD camera 8 is the image pickup start point a _i of the signal of VP2.
The area from below to above the imaging end point b _i is a bright area.
Further, the output signals of the third, fourth, ... Fields are such that the positions of the bright area are sequentially moved as compared with the outputs of the first and second fields.

Here, the distribution of the bright area and the dark area in the image pickup signal will be described. These are roughly divided into Fig. 3.
As shown in (c) to (f), there are a total of four types of luminance distribution patterns. In the figure (c), the upper and lower parts of the screen are dark, the central part of the screen is bright, and the width of the bright part is wider than the width of the dark part. If the width of the bright part is narrower than the width of the dark part, (e) indicates that the upper and lower parts of the screen are the bright part, the central part of the screen is the dark part, and the width of the dark part is wider than the width of the bright part. Is the case where the bright part, the central part of the screen is the dark part, and the width of the dark part is narrower than the width of the bright part. Further, as can be seen from all of the figures (c) to (f), the region above a _i is the dark part and the region below it is the bright part, and at the same time, a _i is the boundary point between the bright part and the dark part. .
Similarly, b _i is a boundary point in which the upper part is the bright part region and the lower part is the dark part region.

Next, in the output 1 which is the imaging output of the first field of the CCD camera 8, the positions of the boundary positions a ₁ and b ₁ at which the brightness difference between the bright area and the dark area occurs are obtained.
The calculation required in the following description is defined by Equation 1. In addition, when formula 1 is described in words, the quotient when A is divided by B is C, and the remainder is D. D = A% B Formula 1 where A = B × C + D

Here, t _CV is a constant determined by the vertical period of the image pickup output signal of the CCD camera 8, and is 16.683 mSec in this embodiment as described above. Also, t _PV
Is a constant that is determined if the vertical cycle of the projected image of VP2 is known, and is detected by the vertical cycle detection circuit 18. Also, FIG.
When the positions of a ₁ and b ₁ are calculated in Equation 2,
Equation 3 is obtained. Regarding the position, the uppermost part of the screen is the origin and the lowermost part of the screen is P as the reference point. a ₁ = P × {(4 × t _CV )% t _PV } / t _PV formula 2 b ₁ = P × {(6 × t _CV )% t _PV } / t _PV formula 3

Similarly, when the positions a ₂ and b ₂ in the output 2 which is the image pickup output of the second field of the CCD camera 8 are calculated, they are obtained by the equations 4 and 5. a ₂ = P × {(5 × t _CV )% t _PV } / t _PV formula 4 b ₂ = P × {(7 × t _CV )% t _PV } / t _PV formula 5

Here, by shifting the reset timing of the VD of the VP2 and the VD for driving the CCD camera 8, that is, by using the delay amount d, a ₁ , b ₁ , a ₂ , b
₂ positions can be moved. When the delay amount d is used, Equations 2 to 5 become Equations 6 to 9 shown below, respectively. a ₁ = P × {(4 × t _CV + d)% t _PV } / t _PV formula 6 b ₁ = P × {(6 × t _CV + d)% t _PV } / t _PV formula 7 a ₂ = P × { (5 × t _CV + d)% t _PV } / t _PV formula 8 b ₂ = P × {(7 × t _CV + d)% t _PV } / t _PV formula 9

Comparing equations 2 to 5 with equations 6 to 9, equations 2 to 5 coincide with the case where the delay amount d = 0 in equations 6 to 9, respectively. Therefore, formula 2 to formula 5
Will be included in equations 6-9.

FIG. 5 is a diagram for explaining the operation of the image pickup apparatus according to the first embodiment of the present invention, in which the VD for driving the CCD camera 8 is driven at a timing delayed by the delay amount d from the VD timing of the VP2. The timing when resetting is shown. The output 1 which is the signal of the first field of the CCD camera 8 is a signal from a1 to b1 when viewed at the timing of the signal of the VP2, and the output 2 which is the signal of the second field is from a2 to b2. Outputs 1 and 2 are shown in FIGS. 6 (a) and 6 (b). Here, Equation 2
Compared with the outputs 1 and 2 (FIGS. 3A and 3B) according to Expression 5, the bright area is moved upward in the screen. When the delay amount d is further increased, as shown in FIG.
As shown in (d), the output screen may be divided into a bright area and a dark area.

From the above, the delay amount d is set so that the boundary between the light area and the dark area does not enter the position depending on the inspection position.
Is calculated, and the delay amount d is calculated from the VD timing of VP2.
By creating a VD for driving the CCD camera 8 in accordance with the above, it is possible to freely move the position (the position of the bright portion or the dark portion) where the brightness level variation occurs in the image pickup output of the CCD camera 8.

On the other hand, the image pickup data stored in the frame memory 11 is limited to the first frame or the second frame of the CCD camera 8. Then, when performing various types of detection, the data area in which the luminance level has changed due to the variation in the luminance level of the imaged output can be moved to a position in the imaged data that is unrelated to the position to be detected, so that correct detection can be performed. The synchronization generating circuit 13 outputs a control signal such that the frame memory 11 stores data at the timing of the output 1 or the output 2 shown in FIG.

As described above, the brightness level fluctuation distribution in the image pickup output signal of the CCD camera 8 can be detected in advance before the image pickup of the test pattern. Therefore, when the image data stored in the frame memory 11 is processed, the bright portion is processed. By cutting out only the area or the dark area and performing the image processing using the data in this area, it is possible to remove the fluctuation in the brightness level.

When a part of the screen 4 is magnified and imaged, the brightness in the image pickup area is kept constant.
That is, if the delay amount d is determined such that the entire image pickup area becomes the bright area or the dark area, the data stored in the frame memory 11 storing the image pickup signal does not have the brightness level variation. Correct imaging can be performed.

Next, a method of determining the delay amount d in the case of enlarging and imaging a partial area of the screen 4 will be described with reference to the drawings. FIG. 7 is a diagram for explaining a case of enlarging and capturing a partial area of an image displayed on the screen. Note that the image pickup area obtained by the enlarged image pickup is the bright area. Further, J is the central position in the vertical direction of the bright area (the midpoint between a ₁ and b ₁ ). Now, in FIG. 7, it is assumed that a region K that is an arbitrary vertical position on the screen (the vertical center position is k (0 <k <P)) is enlarged and imaged.

Here, the image pickup center position k and the bright area midpoint J
The method of determining the delay amount differs depending on the relationship. First, the case where the image pickup center position is above the bright part region center position on the screen, that is, the case where k ≦ J is described. In this case, since the position k at which the image is picked up is above J on the screen, the delay amount d may be determined so that the position of J coincides with the position of k. At this time, the delay amount d is J and k.
Is the ratio to the vertical width P of the screen and the CCD camera 8
_Is determined from the time (t _CV ) of the vertical cycle of Note that t _CV
Is 16.683 mSec because the CCD camera 8 is an NTSC rate camera and can be obtained by the following expression 10. d = 16.683 × (J−k) / P (mSec) Equation 10

On the contrary, when the center position of the image pickup is lower than the center position of the bright area on the screen, that is, when k> J, the delay amount is calculated by using Expression 10, and the negative delay amount d is calculated.
Is calculated. The negative delay amount means going back from the present time point to the past time point, but since such a thing cannot be realized, the imaging position k becomes the midpoint J of the bright area in the next field. The delay amount d may be determined as described above, and is given by Expression 11. d = 16.683 × (P−J + k) / P (mSec) Equation 11

With the delay amount d described above, VP
The synchronizing signal generating circuit 13 creates the driving synchronizing signal for the CCD camera 8 by delaying and resetting from the timing of VD of 2, and the CCD camera 8 captures the test pattern displayed on the screen 4 at this timing. Done,
In addition, at the timing of the default frame, the frame memory 1
1 stores the image pickup output signal.

As described above, when the vertical scanning frequency of the signal projected by the VP2 and the vertical scanning frequency of the CCD camera 8 are different from each other, the entire area of the screen 4 projected by the VP2 or an enlarged image of a partial area is imaged. Even if the above is performed, it is possible to obtain an image pickup signal in real time without fluctuation in the brightness level.

Example 2. Example 1. Then, the driving synchronizing signal of the CCD camera 8 is created by controlling the delay amount d from the VD of the projection signal of the VP2, and the CCD camera 8 is driven by the synchronizing signal thus created and projected on the screen 4. Although the image capturing is adopted, when the vertical scanning frequency of the projected image of VP2 is exactly equal to the vertical scanning frequency of the CCD camera 8, that is, VP2 is N.
When projecting a TSC signal, VD and C of VP2
If the VD of the CD camera 8 is synchronized, the CCD camera 8
There is no change in the brightness level of the bright area and the dark area on the image pickup output screen. Therefore, in this case, VP2
C without using the delay amount d from the VD timing of
It only needs to be created by resetting the VD of the CD camera 8.

FIG. 8 is a block diagram showing the arrangement of an image pickup apparatus according to the second embodiment of the present invention. In the figure, 19
Is a frequency detection circuit for detecting the frequency of VD of the projection signal of VP2 supplied from VP2 to the image pickup apparatus 1.
Other configurations are the same as in the first embodiment. Is the same as that described in.

Since the VD of the video signal projected by the VP2 is constantly input to the frequency detection circuit 19 via the input terminal 17, the frequency detection of the VD of the VP2 is always performed. When the VP2 projects NTSC, the frequency detection circuit 19 detects that the vertical scanning frequency of the projection signal of VP2 is 59.94 Hz, which is the NTSC rate. The detected frequency information is sent from the frequency detection circuit 19 to the CPU 12 via the bus 16. Based on this information, the CPU 12 controls the CCD camera synchronization generation circuit 13 so that the imaging method becomes the NTSC mode.

The CCD camera sync generation circuit 13 is an NTS.
When receiving the command of the C mode, a reset signal is applied at the timing of VD input from the VP2 to generate a sync signal for driving the CCD camera 8. The output synchronizing signal in this case is completely synchronized with the synchronizing signal of VP2.
Therefore, the timing of VP2 and VD of the CCD camera 8 is as shown in FIG. It should be noted that the period of four vertical cycles (time T _W ) after the reset is performed is the time until the PLL inside the CCD camera 8 stabilizes and is set as the image capturing prohibited period. The signal accumulated in the CCD accumulation time T _C1 after the end of the image capturing prohibition period is the CCD as the video signal of the first field.
It is output from the camera 8. Similarly, the second, third, ...
..Field signals are output.

Here, when the output signal of the first field of the CCD camera 8 is shown in FIG. 10A, the uppermost portion of the screen (k =
P ₀ ) matches a ₁ , that is, the start position of the field A of VP2, and the bottom of the screen (k = P) is b ₁ , that is, VP
Coincides with the end position of the field B of. The top and bottom of the screen are substantially at the same position. Therefore, CC
The signal of the first field of the D camera 8 is double-exposed in all areas, but there is no triple-exposure area or single-exposure area, and therefore a bright area and a dark area do not occur.
The brightness level of the image pickup output signal becomes constant. Therefore, CC
Even if the D camera 8 magnifies and captures the whole area or a partial area on the screen 4, the brightness level of the imaging signal does not change, and the imaging signal can be obtained in real time.

The signal of the second field of the CCD camera 8 is as shown in FIG. 10B, and like the signal of the first field, only the signals of the field B and the field C of the projection signal of VP2 are accumulated. Therefore, as in the first field, the bright area and the dark area do not occur in the imaging output.

Here, the frame memory 11 stores the image pickup output signal of the CCD camera 8 at the timing of output 1 or output 2. Therefore, since the brightness level of the image pickup output signal of the CCD camera 8 is always constant, the brightness level of the image pickup signal does not fluctuate in real time even if the whole area or a part of the area on the screen 4 is enlarged and imaged. An image pickup signal can be obtained at.

When the VP2 is an NTSC-dedicated VP, it is possible to adopt a configuration in which the frequency detection circuit 19 is omitted as an image pickup device of the NTSC-dedicated VP.
It suffices to configure the synchronization generation circuit 13 so that the driving synchronization signal for the CCD camera 8 is reset at the timing of VD. Therefore, even if the whole area of the screen 4 projected by the NTSC dedicated VP 2 is imaged or a part of the area is magnified, the brightness level of the imaging signal does not change.
Moreover, it is possible to obtain an image pickup device capable of obtaining an image pickup signal in real time.

Example 3. If the VP2 is a PAL / SECAM-dedicated VP, the PAL / SEC is set on the CCD camera 8.
If a CCD camera for AM is used, the vertical scanning frequency of the projected image of the VP2 and the vertical scanning frequency of the image pickup system match. Similarly, the luminance level fluctuation does not occur in the image pickup output signal only by resetting the CCD camera driving VD at the timing of VD of VP2. The configuration of the image pickup device in this case is the same as in the second embodiment. The vertical scanning frequency detection circuit 19 has the same configuration as that described in
When the vertical scanning frequency of 50 Hz of L / SECAM is detected, the CPU 12 determines that the image pickup device is PAL / SEC.
Control so that the AM mode is set. Therefore, even if the entire area or a partial area on the screen 4 is enlarged and imaged, the luminance level of the image pickup output signal does not change, and the image pickup signal can be obtained in real time.

Example 4. When the VP2 is a HDTV-dedicated VP, if a CCD camera for HDTV is used as the CCD camera 8, the vertical scanning frequency of the projected image of the VP2 and the vertical scanning frequency of the image pickup system match. , And Example 3. Similarly, the VD for driving the CCD camera is VP
The brightness level fluctuation does not occur in the imaging output signal only by resetting at the timing of VD of 2. The configuration of this apparatus at this time is the same as in the second embodiment. When the vertical scanning frequency detecting circuit 19 detects the vertical scanning frequency of 60 Hz of HDTV, the CPU 1
2 controls the image pickup device to be in the HDTV mode. Therefore, even if the entire area or a partial area on the screen 4 is enlarged and imaged, the luminance level of the image pickup output signal does not change, and the image pickup signal can be obtained in real time.

Example 5. Embodiment 2. FIG. ~ Example 4. Then
The case where the signal format projected by the VP2 and the format of the CCD camera are the same was set as the exclusive mode. However, if the field numbers to be imaged by the CCD camera 8 are set in advance as the first and second fields. , If the vertical scanning frequency of VP2 is known, the distribution position of the bright area and the dark area of the image pickup output signal can be known. Therefore, the stage of the image pickup output signal of the CCD camera 8, that is, the stage before the image pickup data is input to the storage unit 11. Thus, it is possible to adopt a configuration for correcting the brightness level fluctuation. FIG. 11 is a block diagram showing the arrangement of the image pickup apparatus according to the fifth embodiment of the present invention. It should be noted that only the main parts are shown in the figure, but in addition to this, the interface circuit 3, the motor control section 9, and the VD input terminal 17 shown in FIG.
Etc. are also connected to the bus 16. Further, FIG. 11A is a configuration example in the case of performing the analog correction processing (signal modulation) at the stage of the analog signal before A / D conversion of the image pickup output signal of the CCD camera 8, while FIG. 6B shows a correction process (data calculation) at the stage when the image pickup output signal of the CCD camera 8 is A / D converted and becomes digital data.
This is an example in the case of being configured to perform. In the figure, reference numeral 21 denotes a correction signal creating unit for correcting distribution of light and dark areas, and reference numeral 22 denotes luminance for correcting a brightness level fluctuation by modulating an image pickup output signal of the CCD camera 8 with a correction signal for distribution correction of light and dark areas. It is a correction modulation circuit.

Now, the relationship between the vertical scanning frequency of the projection signal of VP2 and the vertical scanning frequency of the CCD camera 8 is as shown in FIG. 12 (the vertical scanning frequency of VP2 is CCD.
Higher than the vertical scanning frequency of the camera 8), CC
The output signals of the first and second fields of the D camera 8 are as shown in FIGS. 13 (a) and 13 (b), respectively. A at this time
_{The positions of 1} , b ₁ , a ₂ and b ₂ are the same as in Example 1. As described above, it can be obtained by Equations 2-5. Therefore,
As shown in FIGS. 14A and 14B, the boundary position of the luminance distribution within the vertical cycle can be calculated. In addition, since the brightness ratio between the double exposure area and the triple exposure area is 2: 3, the brightness level distribution can be understood. Therefore, as shown in FIGS. 14 (c) and 14 (d), the correction signal for making the brightness level distribution constant is 1 times the signal in the double exposure area and 2/3 times the signal in the triple exposure area. Then, a signal with a constant brightness is obtained on the entire screen. Therefore, a brightness correction signal can be easily created, and an image pickup signal with a uniform brightness distribution can be obtained only by performing simple signal processing or calculation.

The following description will be given using the embodiment shown in FIG. When taking an image with the CCD camera 8, the CCD
The VD of the camera 8 is reset at the timing of the VD of VP2. (This time is referred to as T ₀ ) Also, the CC to be imaged
The fields of the D camera 8 are limited to the first field and the second field shown in FIG. The time from the resetting of the VD for driving the CCD camera 8 to the time T _W is the time until the PLL circuit inside the CCD camera 8 stabilizes, and is the imaging prohibition period. The position of a _{1 on} the screen is given by equation 2. Similarly, the positions of b ₁ , a ₂ and b ₂ can be calculated by the equations 3 to 5. Further, from the definition of Equation 1, C is the quotient when D is divided by B, and the quotients during the operations of Equations 2 to 5 are C _a1 , C _b1 , C _a2 , and C _b2 , respectively. The number of exposures in the first field output image of the CCD camera 8 is obtained by using this.

In the case of a ₁ <b ₁ , a from the top of the screen
_The number of exposures n _{1 for} the area up to ₁ and the area from b ₁ to the bottom of the screen is (C _b1 −C _a1 ) times, which is the dark area. The number of exposures n _{2 in} the area from a ₁ to b ₁ is (C _b1 −C _a1 +1) = (n ₁ +1) times, which is a bright area. The brightness of the region where the number of exposures is n ₁ and the number of exposures are n
_Since the luminance ratio of the _two regions is n ₁ : n ₂ , the luminance correction signal is ₁ times the signal of the region where the number of exposures is n ₁ , and the signal of the region where the number of exposures is n ₂ is n ₁ / n. It should be n ₂ times.
Here, since the boundary positions a ₁ and b _{1 of} the bright area and the dark area and the number of exposures n ₁ and n ₂ in each area can all be calculated by Expressions 2 to 5, the necessary brightness correction signal is captured. It can be created beforehand beforehand. Such a brightness correction signal is created by the correction signal creating unit 21, and the CCD camera 8
The image pickup output signal of is modulated in the luminance correction modulation circuit 22. As described above, the luminance of the image pickup output signal in the first field of the CCD camera 8 becomes constant, the luminance level fluctuation of the image pickup output signal disappears, and the image pickup signal can be obtained in real time.

On the contrary, in the case of a ₁ > b ₁ , the number of exposures n ₁ of the area from the top of the screen to b ₁ and the area from a ₁ to the bottom of the screen is (C _b1 −C _a1 +1) times. And this is the bright area. In addition, the number of exposures n in the area from b ₁ to a _1
2 becomes (C _b1 −C _a1 ) = (n ₁ −1) times, which is a dark area. The luminance ratio of the region where the number of exposures is n ₁ and the luminance for the region where the number of exposures is n ₂ is n ₁ : n ₂ , so that the luminance correction signal is n _{2 for} the region of the number of exposures n _1. / N ₁ times, and the signal in the region where the number of exposures is n ₂ times may be 1 time. Such a brightness correction signal is created in advance by the correction signal creating unit 21, and the image pickup output signal of the CCD camera 8 is set to the brightness. When modulated by the correction modulation circuit 22, the brightness of the image pickup output signal in the first field of the CCD camera 8 becomes constant,
There is no change in the brightness level of the image pickup output signal, and the image pickup signal can be obtained in real time.

In the second field, the brightness distribution due to the brightness level fluctuation can be calculated in the same manner as in the first field, so that the correction signal creating section 21 can create the brightness correction signal. Therefore, a luminance correction signal corresponding to a ₂ and b ₂ is created, and the luminance correction modulation circuit 22 modulates the output video signal of the CCD camera 8 using this correction signal to make the luminance of the image pickup output signal constant. Therefore, it is possible to obtain an image pickup apparatus capable of eliminating the fluctuation of the brightness level and obtaining an image pickup signal in real time.

Further, as shown in FIG. 11B, the CCD
Even when the output signal of the camera 8 is converted into digital data by the A / D conversion circuit 10 and the brightness correction processing is performed at the stage of digital data, the output correction signal of the correction signal creation unit 21 only becomes digital data. Brightness correction modulation circuit 22
The operation described in (4) is merely an operation of digital data, and as described above, the same effect as that of the embodiment shown in FIG. 11A can be obtained.

Example 6. Example 5. Considering the case where the projected image of VP2 is NTSC using the image pickup device described in the above, since the vertical scanning frequency of VP2 and the vertical scanning frequency of CCD camera 8 match, the VD for CCD camera 8 is set at the start of image pickup. Only by resetting at the timing of VD of VP2, it is possible to obtain an image pickup output signal with no brightness level fluctuation. Therefore, when the VP projecting the NTSC is imaged, it is not necessary to perform the modulation for correcting the brightness distribution. In other words, the correction signal created by the brightness correction signal creation unit 21 creates a certain DC value (a signal that is multiplied by 1), and the modulation circuit 22 modulates the image pickup output signal of the CCD camera 8 with the DC signal. It will be the same as that.

Therefore, the VD frequency of VP2 is detected by the vertical scanning frequency detection circuit 19, and the detection signal is 59.94.
If it is determined that the frequency is Hz (NTSC), a luminance correction signal for doubling the luminance over the entire screen is created, and thus the fifth embodiment. NTSC with the same configuration as described in
It is possible to capture an image of the VP2 that is projecting, and even if the entire region or a partial region of the screen 4 is enlarged and captured, an image output without a brightness level change can be obtained in real time.

Example 7. VP2 is an auto scan type VP
Since there are many signal formats displayed by the VP2, there are cases where the vertical scanning frequencies of the display system and the imaging system are different from each other, and there are cases where they match. CC in the former case
The method for creating the synchronization signal for driving the D camera 8 is described in the first embodiment. Mentioned in. Further, in the latter case, the method of creating the synchronizing signal for driving the CCD camera 8 is described in the second embodiment. Mentioned in. Therefore, VP2
The vertical scanning frequency of the signal to be displayed may be detected, and the method of generating the synchronizing signal for driving the CCD camera 8 may be changed according to the detected frequency. Since the synchronization signal for driving the CCD camera 8 is generated inside the synchronization generation circuit 13, the configuration of the embodiment of the image pickup apparatus having the above configuration is the same as that of the first embodiment. It can be realized with the same configuration as the configuration described in (1).

The operation procedure of the synchronization generating circuit 13 in this embodiment is shown as a flowchart in FIG.
A procedure for creating the D camera 8 drive synchronization signal will be described. In the figure, S100 is a step of detecting the vertical scanning frequency of the signal displayed by the VP2. this is,
The frequency fv _SIG is detected when the VD input from the VD input terminal 17 of the VP is detected by the vertical period detection circuit 18 which detects the vertical period. Detection frequency fv _SIG is bus 16
Is transmitted to the CPU 12 via.

Next, in step S110, it is determined whether the detected fv _SIG matches the vertical frequency fv _CCD of the CCD camera 8. Here, since fv _CCD has a known value, the CPU 12 simply needs to compare the data. Here, when these do not match, the first embodiment.
In order to create the sync signal for the CCD camera 8 by the method described in step S1, the process proceeds to step S120. On the other hand, if the fv _SIG and the fv _CCD match, the second embodiment. Proceed to the NTSC mode described in.

In the case of the NTSC mode, in step S151, the second embodiment. As described above, C at the timing of VD of VP
The sync signal for driving the CD camera 8 is reset and output.

On the other hand, when fv _SIG and fv _CCD do not match, in S120, t _PV which is the period of fv _SIG is detected. This is performed by the vertical cycle detection circuit 18. continue,
In S130, the position of the brightness level fluctuation in the image pickup output signal is calculated by Expressions 2 and 3. In S140, S
From the position data of the brightness level fluctuation calculated in 130 and the data of the position where the image is picked up, the delay time d required to prevent bright and dark stripes from appearing in the area where the image is actually picked up is calculated. The steps S130 and S140 are performed by the CPU 12
Done in.

Then, in S150, the delay amount d calculated in S140 is used as the delay time from the timing of VD of VP to reset the CCD camera 8 drive synchronizing signal and output it.

In S160, the control signal for storing data in the frame memory 11 is output at a predetermined time position in order to store the image pickup data in the frame memory 11 at the timing of the image pickup frame position of the image pickup data stored in the frame memory 11. To do. As described above, as an image pickup apparatus for picking up an image displayed by the auto-scan type VP, even if an enlarged image pickup of the whole area or a part of the area on the screen 4 is performed, an image pickup output without a brightness level change can be obtained in real time.

Example 8. Example 6. In the above, the embodiment in which the NTSC signal is specially treated and processed is described. However, as a different method, a configuration in which no modulation for luminance distribution correction is performed at the time of capturing an image of the VP2 projecting the NTSC is described. Can be taken. It should be noted that in order to image a non-NTSC signal, the fifth embodiment is described. The configuration described in 1 is also required, and a configuration having an NTSC mode and a non-NTSC mode is required.

FIG. 16 is a block diagram showing the arrangement of an image pickup apparatus according to Embodiment 18 of the present invention.
Reference numeral 19 denotes a vertical scanning frequency detection circuit for detecting the vertical scanning frequency of the projection signal of VP2, which is connected to the bus 16 for exchanging data with the CPU 12.
Reference numeral 31 is a picked-up image selection switch circuit for selecting input of a picked-up image output signal input to the A / D conversion circuit 10,
The output signal of the brightness correction modulation circuit 22 and the output of the CCD camera 8 are input, and the output is selected from these two signals. 32 is a V obtained from the CPU 12 via the bus 16
A switch control unit that creates a signal for controlling the captured image selection switch circuit 31 from the vertical scanning frequency information of the projection signal of P2. Further, the bus 16 in the figure is also connected to the interface circuit 3 for communicating with the VP 2 and the motor control section 9, but these are omitted in the figure. Note that FIG. 16 shows a configuration in which the luminance distribution correction process is performed by analog signal processing before A / D conversion of the image pickup output signal of the CCD camera 8.
The configuration may be such that the image pickup output signal of the CCD camera 8 is A / D converted and converted into digital data, and then the luminance distribution correction process is performed.

Next, the operation will be described. When the vertical scanning frequency detection circuit 19 detects that the vertical scanning frequency of the signal projected by the VP2 is 59.94 Hz, that is, NTSC, the CPU 12 receives the CPU 12 via the bus 16.
This information is communicated to. Then, the CPU 12 outputs the signal of the NTSC mode in order to set the imaging mode of the imaging device to the NTSC mode. This signal is transmitted to the switch control unit 32 via the bus 16. The switch control unit 32 switches the captured image selection switch circuit 31 so that the output signal of the CCD camera 8 is directly input to the A / D conversion circuit 10 so that the NTSC mode is set.

Since the information of the NTSC mode is also transmitted to the synchronization generation circuit 13 via the bus 16, CC
As described in the above embodiment, the method of generating the drive synchronizing signal of the D camera 8 is the V of the VP2 via the VD input terminal 17.
It is created by resetting at the timing of D. The synchronization signal thus created is supplied from the external synchronization input terminal 14 of the CCD camera 8 to drive the CCD camera 8 and start imaging.

On the other hand, when the VP2 is projecting a signal other than NTSC, the vertical scanning frequency detecting circuit 19 detects the frequency of the vertical scanning frequency currently being projected, and the detected frequency information is transmitted via the bus 16. CPU12
Conveyed to. Further, the CPU 12 transmits the detected vertical scanning frequency information to the synchronization generating circuit 13 via the bus 16, and the synchronization generating circuit 13 responds to the C corresponding to the vertical scanning frequency.
A sync signal for driving the CD camera 8 is generated. At the same time, the CPU 12 outputs a control signal for setting the non-NTSC mode, and the information of the non-NTSC mode is transmitted to the switch control unit 32 via the bus 16. The switch controller 32 is set to the non-NTSC mode, that is, CC
The picked-up image selection switch circuit 31 is switched so that the picked-up image output signal of the D camera 8 is subjected to the brightness correction via the brightness correction modulation circuit 22 and input to the A / D conversion circuit 10.

The method for correcting the brightness level in the non-NTSC mode is described in the fifth embodiment. Is the same as that described in.
Therefore, when it is used as an image pickup device of an auto scan VP in which the vertical scanning frequency of a projected signal changes, an image pickup output in which the brightness level of the image pickup output signal does not change can be obtained in real time even if a partial area of the screen is enlarged and imaged. An image pickup device can be obtained.

Example 9. Example 6. And Example 8. Is C
I used a CDCD camera that drives at the NTSC rate as the CD camera 8, but I changed the CCD camera 8 to PAL / SEC.
When a CCD camera driven at the AM rate is used, PAL / SECAM is used instead of the one in which the NTSC signal is treated specially in each of the above embodiments.
If the CAM is treated specially and the picked-up image selection switch circuit 31 is controlled in the PAL / SECAM mode and the non-PAL / SECAM mode, an image pickup device having exactly the same effect as that of the above embodiment can be obtained. The configuration of the present apparatus in that case is the same as that of the sixth embodiment. And Example 8. The configuration is exactly the same as that described in, and the same effect can be obtained.

Example 10. Example 9. Then, PAL / S
ECAM signal was treated specially, but the CCD camera 8 has HD
When a CCD camera driven at the TV rate is used, if the HDTV signal is treated specially and the picked-up image selection switch circuit 31 is controlled in the HDTV mode and the non-HDTV mode, an image pickup device with exactly the same effect can be obtained. can get. Further, in this case, the configuration of the present device is exactly the same as the configuration described in the above embodiment, and has the same effect.

Example 11. Each of the above examples 1. -10. Then, as the image display device, a VP which is a projection type image display device is used.
However, even if the image display device is a direct-view type display such as a television set, the same processing is performed by the image capturing device having the same configuration as each of the above embodiments. As a result, the same effect as that of each of the above embodiments can be obtained.

[0095]

According to the image pickup device of the first aspect of the present invention, the vertical scanning frequency of the display system, the vertical scanning frequency of the image pickup system, and the image pickup position on the display screen are used for driving the camera which is the image pickup means. The timing of the sync signal is calculated and reset to create the sync signal, and the imaging signal after a preset time has elapsed from the reset is stored in the memory, so it is displayed when the vertical scanning frequency of the display system and the imaging system are different. Even if you magnify the whole area or part of the image,
It is possible to obtain an image pickup apparatus capable of removing the fluctuation in the brightness level of the image pickup output signal of the image pickup unit and obtaining the image pickup signal in real time, and it is possible to perform various correct adjustments of the image display apparatus.

According to the image pickup device of the second aspect of the present invention, the distribution of the luminance level fluctuation in the image pickup output signal is calculated from the vertical scanning frequency of the display system and the vertical scanning frequency of the image pickup system, and the luminance level fluctuation is calculated. It is created by calculating and resetting the timing of the drive synchronizing signal of the camera, which is the image pickup means, from the distribution and the image pickup position on the display screen, and the image pickup signal after a predetermined time has elapsed from the reset is stored in the memory. When the vertical scanning frequency of the image pickup system is different, even if the entire area or a partial area of the display image is enlarged and imaged, the variation in the brightness level of the image pickup output signal of the image pickup means can be removed, and the image is picked up in real time. An image pickup device capable of obtaining a signal can be obtained, and various correct adjustments of the image display device can be performed.

According to the image pickup device of the third aspect of the present invention, when the vertical scanning frequency of the display system and the vertical scanning frequency of the image pickup system match, the drive synchronizing signal of the camera which is the image pickup means. Since the creation method is only reset at the timing of the VD of the display system, the configuration of the synchronization signal creation circuit for driving the camera is simple and inexpensive, and the entire or partial area of the display image is enlarged and imaged. Even if it is possible to eliminate the fluctuation of the brightness level of the image output signal of the image pickup means,
Moreover, it is possible to obtain an image pickup device capable of obtaining an image pickup signal in real time, and it is possible to perform various correct adjustments of the image display device.

According to the fourth aspect of the image pickup device of the present invention, the vertical scanning frequency of the display system, the vertical scanning frequency of the image pickup system, the image pickup position on the display screen, and the temporal position of the image pickup output signal are four. Since the distribution of the brightness level fluctuation in the image pickup output of the camera as the image pickup means can be calculated by the person
It is possible to calculate a correction signal for correcting the brightness level fluctuation, reset the camera drive synchronization signal at the timing of VD of the display system, and modulate the image pickup output signal of the camera with the brightness correction signal. Since the fluctuation of the brightness level can be eliminated, the brightness level of the image pickup output signal of the image pickup means can be obtained even if the entire area or a partial area of the display image is magnified when the vertical scanning frequencies of the display system and the image pickup system are different. It is possible to obtain an image pickup device capable of removing fluctuations and obtaining an image pickup signal in real time, and it is possible to perform various correct adjustments of the image display device.

According to the fifth aspect of the image pickup apparatus of the present invention, a method for generating a drive synchronization signal for a camera, which is an image pickup method when the vertical scanning frequencies of the display system and the image pickup system are different, and the display system. And a method for creating a synchronization signal for driving a camera, which is an imaging method when the vertical scanning frequency of the imaging system matches, the vertical scanning frequency detected by detecting the vertical scanning frequency of the image signal displayed by the display system. The camera drive synchronization signal creation method is switched according to the scanning frequency, so even if the entire area or part of the display image of the auto-scan image display device that displays images at any vertical scanning frequency is enlarged, It is possible to obtain an image pickup device capable of effectively eliminating the fluctuation in the brightness level of the image pickup output signal of the means, and it is possible to perform various correct adjustments of the image display device.

According to the sixth aspect of the present invention, the image pickup device is created by resetting the camera driving synchronizing signal at the timing of the display system VD, and the vertical scanning frequencies of the display system and the image pickup system are different from each other. In this case, the distribution of the brightness level fluctuation in the image pickup output signal is calculated from the vertical scanning frequencies of the display system and the image pickup system, the image pickup position on the display screen, and the temporal position of the image pickup output signal, and the brightness level change is corrected. Taking a method of removing the brightness level fluctuation by creating a correction signal and modulating the imaging output signal, on the other hand,
When the vertical scanning frequencies of the display system and the imaging system match, the imaging output signal is not modulated to obtain imaging data with good S / N, and the vertical scanning frequency of the image signal displayed by the display system is taken. Is detected and the imaging method is switched according to the detected vertical scanning frequency, so even if the entire area or a partial area of the display image of the image display device that displays an image of any vertical scanning frequency is enlarged, It is possible to obtain an image pickup device capable of effectively removing the fluctuation in the brightness level of the image pickup output signal of the image pickup means, and it is possible to perform various correct adjustments of the image display device.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a configuration of an image pickup device according to a first embodiment of the present invention.

FIG. 2 is a timing chart for explaining the operation of the image pickup device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a distribution of brightness and darkness caused by a luminance variation of an output signal of a CCD camera.

[Fig. 4] CC in the case of magnifying and imaging a part of the screen
It is a figure which shows the distribution of the brightness | luminance which arises by the brightness | luminance change of the output signal of a D camera.

FIG. 5 is a diagram for explaining the operation of the image pickup device according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a distribution of brightness and darkness caused by a luminance variation in an image pickup output signal of a CCD camera.

FIG. 7 is a diagram for explaining a case where a partial area of an image displayed on the screen is enlarged and imaged.

FIG. 8 is a block diagram showing a configuration of an image pickup device according to a second embodiment of the present invention.

FIG. 9 is a diagram for explaining the operation of the image pickup device according to the second embodiment of the present invention.

FIG. 10 is a diagram for explaining the screens of the first and second fields of the output signal of the CCD camera.

FIG. 11 is a block diagram showing a configuration of an image pickup device according to a fifth embodiment of the present invention.

FIG. 12 is a diagram for explaining the operation of the image pickup device according to the fifth embodiment of the present invention.

FIG. 13 is a diagram showing a screen of first and second fields of an output signal of a CCD camera.

FIG. 14 is a diagram for explaining brightness correction.

FIG. 15 is a flowchart illustrating an operation procedure of the image pickup device according to the seventh embodiment of the present invention.

FIG. 16 is a block diagram showing a configuration of an image pickup device according to an eighth embodiment of the present invention.

FIG. 17 is a block diagram showing a configuration example of a conventional image pickup device.

FIG. 18 is a diagram for explaining the operation of the conventional image pickup device.

FIG. 19 is a block diagram showing another configuration example of a conventional image pickup device.

FIG. 20 is a diagram for explaining the operation of the conventional image pickup device.

FIG. 21 is a diagram for explaining the operation of the conventional image pickup device.

[Explanation of symbols]

1 image pickup device, 2 CRT system VP, 3 interface circuit, 4 screen, 6, 7 motor, 8 CC
D camera, 9 motor control unit, 10 A / D conversion circuit,
11 frame memory, 12 CPU, 13 sync generation circuit, 14 CCD camera external sync signal input terminal, 1
6 buses, 17 VP VD input terminal, 18 vertical cycle detection circuit, 19 vertical scanning frequency detection circuit, 21 correction signal creation section, 22 brightness correction modulation circuit, 31 picked-up image selection switch circuit, 32 switch control section.

Claims (6)

[Claims] 1. An image pickup device for picking up a test signal displayed by the image display device when performing setup adjustment and the like of the image display device, comprising an image pickup means for picking up an image of the test signal displayed by the image display device. And a calculation for calculating a predetermined time determined from the vertical scanning frequency of the signal displayed by the image display device, the vertical scanning frequency of the image pickup device, and the inspection position in the image displayed by the image display device. Means, a synchronization signal creating means for resetting and outputting the image pickup means driving sync signal after a predetermined time delay calculated by the calculating means from the vertical sync signal of the signal displayed by the image display device, and an image pickup means drive And a storage unit for storing the output of the image pickup unit after a lapse of a predetermined time after resetting the sync signal for use. 2. The image pickup device according to claim 1, wherein a vertical scanning frequency of a signal displayed by the image display device and a distribution of luminance level fluctuations generated in the image pickup output signal from the vertical scanning frequency of the image pickup means. Then, from the distribution information of the brightness level fluctuation and the inspection position in the image displayed by the image display device, from the vertical synchronization signal of the signal displayed by the image display device, the synchronization signal for driving the image pickup means is calculated. An image pickup device having a sync signal creating means for calculating a predetermined time until the resetting, and resetting and outputting the sync signal for driving the image pickup means using the predetermined time as a delay time. 3. An image pickup device for picking up a test signal displayed by the image display device when performing setup adjustment and the like of the image display device, having an image pickup means for picking up an image of the test signal displayed by the image display device. And a synchronizing signal creating means for resetting and outputting the image pickup means driving sync signal at the timing of the vertical synchronizing signal of the signal displayed by the image display device, and a preset time after resetting the image pickup means driving sync signal. An image pickup device comprising: a storage unit that stores the output of the image pickup unit after a lapse of time. 4. An image pick-up device for picking up an image displayed by the image display device in an image pick-up device for picking up a test signal displayed by the image display device when performing setup adjustment of the image display device, and the image display. A synchronization signal generating means for resetting and outputting the synchronizing signal for driving the image pickup means at the timing of the vertical synchronizing signal of the signal displayed by the device; and a storage means for storing the output signal of the image pickup means, and , The vertical scanning frequency of the signal displayed by the image display device,
The vertical scanning frequency of the image pickup means, the inspection position in the image displayed by the image display device, and the distribution of the brightness level fluctuation of the output signal of the image pickup means determined by the temporal position of the output frame of the image pickup means are compensated. An image pickup device, comprising: a luminance correction signal generating means for generating a luminance correction signal for performing the luminance correction signal; and a correcting means for correcting the luminance of the output signal of the image pickup means by the output signal of the luminance correction signal generating means. 5. An image pickup device for picking up an image displayed by the image display device in an image pickup device for picking up a test signal displayed by the image display device when performing setup adjustment of the image display device, and the image display. A frequency detection means for detecting the vertical scanning frequency of the signal displayed by the device, and displaying the delay time from the vertical synchronizing signal of the signal displayed by the image display device on the image display device. The vertical scanning frequency of the signal, the vertical scanning frequency of the image pickup means, and the predetermined time calculated from the three of the inspection positions in the image displayed by the image display device, and resets and outputs the synchronizing signal for driving the image pickup means. And a method of resetting and outputting the synchronizing signal for driving the image pickup means at the timing of the vertical synchronizing signal of the signal displayed by the image display device. And a storage unit for storing the output of the image pickup unit after a lapse of a predetermined time after resetting the image pickup unit driving sync signal,
An image pickup device, characterized in that the operation method of the synchronizing signal generating means is switched by the output of the frequency detecting means. 6. An image pickup device for picking up an image displayed by the image display device, wherein the image pickup device picks up a test signal displayed by the image display device when the setup adjustment of the image display device is performed. A vertical scanning frequency of the signal displayed by the image display device, and a vertical scanning frequency of the image pickup means,
A luminance correction signal for compensating a distribution of luminance level fluctuations of the output signal of the image pickup means, which is determined by the inspection position in the image displayed by the image display device and the temporal position of the output frame of the image pickup means, is created. Brightness correction signal generating means, correction means for correcting the brightness of the output of the image pickup means by the output signal of the brightness correction signal generating means, and driving of the image pickup means at the timing of the vertical synchronizing signal of the signal displayed by the image display device. A synchronizing signal creating means for resetting and outputting the synchronizing signal for use and a frequency detecting means for detecting the vertical scanning frequency displayed by the image display device, and the storage means stores the output by the frequency detecting means. An image pickup device characterized by switching the output of the image pickup means to be stored.