JP3048411B2 - Video camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera having a zoom function and an electronic viewfinder.

[0002]

2. Description of the Related Art By using a video camera, it is possible to capture a still image in addition to a moving image. However, the resolution of a video camera is lower than that of a photo camera (film camera), and it is often desired to use the photo camera together with the video camera. For example, it is conceivable to fix the photo camera to the video camera and operate the shutter of the photo camera while capturing a moving image with the video camera.

In such a case, if the image frame of the photo camera is displayed on the electronic viewfinder of the video camera, the user can recognize the image field of the photo camera with the electronic viewfinder, and accurately perform the shutter operation and the zoom operation. be able to.

[0004]

By the way, in a video camera having a zoom function, when the zoom magnification changes, the angle of view of the imaging screen changes. The same applies to a photo camera having a zoom function. Therefore, the positional relationship between the imaging screen and the image frame of the photo camera changes according to the change in the zoom magnification of the video camera or the photo camera.

In view of the above, the present invention is intended to accurately recognize the field of view of a photo camera even when the zoom magnification changes.

[0006]

SUMMARY OF THE INVENTION The present invention provides an image frame signal generating means for generating an image frame signal for displaying an image frame of a photo camera having a zoom function in a video camera having a zoom function and an electronic viewfinder. And an image frame position changing means for changing the image frame position of the photo camera in accordance with a change in the angle of view due to a change in zoom magnification; and a signal synthesizing means for synthesizing the captured video signal and the image frame signal. In addition to the fixed display of the imaging screen on the screen, the image frame of the photo camera is displayed based on the imaging screen.

[0007]

When the zoom magnification of the video camera becomes low or high, the angle of view becomes large or small, and the image frame of the photo camera becomes small or large. On the other hand, when the zoom magnification of the photo camera becomes low or high, the angle of view becomes large or small, and the image frame of the photo camera becomes large or small. That is, the image frame of the photo camera changes according to the change in the zoom magnification.

[0008] According to the above configuration, since the image frame of the photo camera is displayed on the electronic view finder with reference to the imaging screen of a fixed size, the field of view of the photo camera can be accurately recognized, and the user can use the electronic view finder. , The shutter operation and the zoom operation of the photo camera can be performed accurately while watching the display screen.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. In this example, a video camera and a photo camera are integrally formed.

FIG. 1 is a perspective view showing the overall configuration. In FIG. 1, reference numeral 1 denotes a cabinet. Although not shown, the cabinet 1 contains a video camera unit including an image sensor, a signal processing circuit, and the like, and a photo camera unit including a film loading mechanism, a film driving mechanism, and the like.

Reference numeral 2 denotes an imaging lens of a video camera unit,
Reference numeral 3 denotes an imaging lens of the photo camera unit. That is, the optical systems of the video camera unit and the photo camera unit are configured separately. The focal length f of the imaging lens 2 is 7 mm to 42 m
A 6 × m zoom lens is used. On the other hand, as the imaging lens 3, a 3 × zoom lens having a focal length f of 35 mm to 105 mm is used.

In this embodiment, an electronic view finder composed of a small CRT is provided in the cabinet 1.
A screen captured by the video camera unit via the imaging lens 2 is displayed on the RT. 4 is an eyecup. In addition,
There is no finder for directly checking the screen imaged by the photo camera unit via the imaging lens 3.

Reference numerals 5T and 5W denote zoom operation buttons for performing zoom operations in the TELE direction and the WIDE direction, respectively. Reference numeral 6 denotes a recording button for performing an operation of recording an imaged video signal output from the video camera unit on a VTR, and reference numeral 7 denotes a shutter button of the photo camera unit. Reference numeral 8 denotes a film rewind operation button.

FIG. 2 shows the configuration of the video camera unit. Image light from a subject is supplied via an imaging lens 2 and an iris 11 to a single-chip CCD solid-state imaging device 12 having complementary color checkerboard color filters.

FIG. 3 is a schematic diagram of the color coding of the image pickup device 12. As shown in FIG. As shown in the figure, field reading is performed. In the A field, charges are mixed in pairs such as A1 and A2, and in the B field, B1 and B2 are mixed.
Charges are mixed in pairs such as 2. Then, from the horizontal shift register Hreg, A1, A in the A field
.., B1, B2,...
The charges are output in the order of.

Here, as shown in FIG. 4, the order of the charges a, b,... Is (Cy +
G), (Ye + Mg),..., (Cy + Mg), (Ye + G),... In the A2 line, and (G + Cy), (Mg + Y) in the B1 line.
e),..., and (Mg +
Cy), (G + Ye),.

The charge output from the image pickup device 12 as described above is supplied to a CDS circuit (correlated double sampling circuit) 13 and is extracted from the CDS circuit 13 as an image pickup signal. By using this CDS circuit 13,
As is well known, reset noise can be reduced.

Timing pulses required by the image pickup device 12 and the CDS circuit 13 are supplied from a timing generator 14. The timing generator 14 has 8
fsc (fsc is the color subcarrier frequency) reference clock CK0
, And horizontal and vertical synchronization signals HD and VD are supplied from the synchronization generator 16. On the other hand, synchronization generator 1
6 is a clock CK of 4 fsc from the timing generator 14.
1 is supplied.

An image signal output from the CDS circuit 13 is supplied to a level detection circuit 17, and an output signal of the detection circuit 17 is supplied to an iris driver 18. And
The iris of the iris 11 is automatically controlled by the iris driver 18.

Here, a process for obtaining a luminance signal Y and a chroma signal (color difference signal) from the image pickup signal output from the CDS circuit 13 will be described.

The luminance signal Y is obtained by adding adjacent signals. In FIG. 4, a + b, b +
An added signal of c, c + d, d + e,... is sequentially formed.

For example, the A1 line is approximated by the following equation. Here, Cy = B + G, Ye = R + G, Mg
= B + R.

Y = {(Cy + G) + (Ye + Mg)) × 1/2 = (2B + 3G + 2R) × 1/2 Further, the A2 line is approximated by the following equation.

Y = {(Cy + Mg) + (Ye + G))} × 1/2 = (2B + 3G + 2R) × 1/2 Other lines of the A field and lines of the B field are similarly approximated.

The chroma signal is obtained by subtracting adjacent signals.

For example, the A1 line is approximated by the following equation.

R−Y = (Ye + Mg) − (Cy + G) = (2R−G) Further, the A2 line is approximated by the following equation.

-(B−Y) = (Ye + G) − (Cy−Mg) = − (2B−G) The other lines in the A field and the lines in the B field are similarly processed with the red difference signals RY and RY. The blue difference signal-(BY) is obtained alternately in a line-sequential manner.

Returning to FIG. 2, the imaging signal output from the CDS circuit 13 is supplied to a low-pass filter 20 constituting a luminance processing unit via an AGC circuit 19. The low-pass filter 20 performs an addition process (averaging) of adjacent signals. Therefore, this low-pass filter 2
From 0, a luminance signal Y is output.

The image signal output from the AGC circuit 19 is supplied to sample and hold circuits 21 and 22 constituting a chroma processing unit. Sample and hold circuit 21,
Sampling pulses SHP1 and SHP2 (illustrated by E and F in FIGS. 5 and 6) are supplied from the timing generator 14 to 22.

From the sample and hold circuit 21, (Cy
+ G) or (Cy + Mg) continuous signal S1 is output and supplied to the subtractor 23 (shown in FIGS. 5B and 6B). From the sample and hold circuit 22, (Ye + M
g) or a continuous signal S2 of (Ye + G) is output and supplied to the subtractor 23 (shown in FIGS. 5C and 6C).

In the subtractor 23, the signal S1 is subtracted from the signal S2. Therefore, the subtractor 23 outputs the red difference signal RY and the blue difference signal-(BY), respectively, in a line-sequential manner (illustrated in FIGS. 5D and 6D).

The color difference signal output from the subtractor 23 is supplied to the fixed terminal b of the direct changeover switch 24 and the fixed terminal a of the changeover switch 25 and has a delay time of one horizontal period. The signal is supplied to the fixed terminal on the a side of the changeover switch 24 and the fixed terminal on the b side of the changeover switch 25 via 26.

Switching of the changeover switches 24 and 25 is controlled by the controller 27. That is, one horizontal period during which the red difference signal RY is output from the subtractor 23 is b.
, While one horizontal period during which the blue difference signal-(BY) is output is connected to the a side. The controller 27 is supplied with the synchronization signals HD and VD from the synchronization generator 16 as reference synchronization signals, and is also supplied with a clock CK1 from the timing generator 14.

Since the changeover switches 24 and 25 are switched as described above, the changeover switch 24 outputs the red color difference signal RY in each horizontal period, and the changeover switch 25 outputs the blue color difference signal − ( BY) is output.

The luminance signal Y output from the low-pass filter 20 and the color difference signals (RY) and-(BY) output from the changeover switches 24 and 25 are supplied to an encoder 28. The encoder 28 is supplied with a composite synchronization signal SYNC, a blanking signal BLK, a burst flag signal BF, and a color subcarrier signal SC from the synchronization generator 16.

In the encoder 28, as is well known, a synchronizing signal SYNC is added to the luminance signal Y, and a quadrature two-phase modulation is applied to the color difference signal to form a carrier color signal C, and a color burst signal is added. . And
The luminance signal Y and the carrier chrominance signal C are added to form an NTSC color video signal, for example. Thus, the color video signal SCV output from the encoder 28 is led out to the output terminal 29.

The encoder 28 outputs a monochrome video signal SV (a luminance signal Y to which a synchronization signal SYNC has been added). The monochrome video signal SV is supplied to an electronic viewfinder 30 via an adder 31. Then, an imaging screen is displayed on a small CRT constituting the electronic viewfinder 30.

The zoom magnification of the imaging lens 2 is adjusted by a zoom driver 41. FIG. 7 shows a specific configuration of the zoom driver 41. In the figure, reference numeral 411 denotes a lens constituting the imaging lens 2;
This is for adjusting the zoom magnification. This lens 4
The zoom magnification is adjusted by moving the position 11 back and forth by rotational driving. For example, by rotating to the T side, it is adjusted in the TELE direction, and by rotating to the W side, it is adjusted in the WIDE direction.

The rotation of the lens 411 is performed by a DC motor 412. One end and the other end of the motor 412 are connected to output terminals q1 and q2 of the zoom driver 413, respectively. The input terminals p1 and p2 of the zoom driver unit 413 are connected to changeover switches 45 and 4 respectively.
6 is connected to the T-side and W-side fixed terminals of the zoom operation switch 42 via the v side.

The changeover switches 45 and 46 are switched by a zoom operation selection button (not shown in FIG. 1) arranged on the cabinet 1. For example, when the zoom operation selection button is not pressed, it is connected to the v side. On the other hand, when pressed, it is connected to the p-side.

When a high-level "H" signal is supplied to the terminal p1 of the zoom driver unit 413, a current flows through the motor 412 in the direction from the terminal q1 to the terminal q2 (shown by a solid line), and the lens 411 moves in the T direction. Is driven to rotate. Conversely, when a high-level “H” signal is supplied to the terminal p2, the motor 41 is moved in the direction from the terminal q2 to the terminal q1.
2, a current flows (shown by a broken line), and the lens 411 is driven to rotate in the W direction. When a high-level "H" signal is not supplied to either of the terminals p1 and p2, the motor 4
No current flows through the lens 12, and the lens 411 is not driven to rotate in any direction, and its position is maintained.

The movable terminal of the zoom operation switch 42 is connected to a power supply terminal. Operation buttons 5T, 5W of cabinet 1
Is pressed, the zoom operation switches 42
Side and W side. When the operation buttons 5T and 5W are pressed without pressing the zoom operation selection button, a high-level “H” signal is supplied to the terminals p1 and p2 of the zoom driver unit 413, respectively, and zoom adjustment in the TELE direction and the WIDE direction is performed. Done.

As shown in FIG. 2, a variable resistor 44 constituting a potentiometer is disposed at a position where the lens 411 of the imaging lens 2 is mounted. The movable element position of the variable resistor 44 is configured to be shifted by the rotation of the lens 411. A voltage corresponding to the zoom magnification is obtained for the movable element, and this voltage is supplied to the controller 27 as a detection signal SDv. As shown in FIG. 8, the detection signal SDv is set to, for example, 1 V at the WIDE end (f = 7 mm) and 4 V at the TELE end (f = 42 mm).

The zoom magnification of the imaging lens 3 is adjusted by a zoom driver 47. FIG. 9 shows a specific configuration of the zoom driver 47. Since the zoom driver 47 is configured in the same manner as the above-described zoom driver 41, corresponding portions are denoted by the same reference numerals and detailed description thereof will be omitted.

The zoom driver 4 of the zoom driver 47
13 input terminals p1 and p2
T of the zoom operation switch 42 via the p-sides of 5, 46
Side and W side fixed terminals.

When the operation buttons 5T and 5W of the cabinet 1 are pressed, the zoom operation switch 42
Connected to the side. When the operation buttons 5T and 5W are pressed while the zoom operation selection button is pressed, a high-level “H” signal is supplied to the terminals p1 and p2 of the zoom driver unit 413, and zoom adjustment is performed in the TELE direction and the WIDE direction. Done.

As shown in FIG. 2, a variable resistor 48 constituting a potentiometer is disposed at a position where the lens 411 of the imaging lens 3 is mounted. The movable element position of the variable resistor 48 is configured to be shifted by the rotation of the lens 411, and a voltage corresponding to the zoom magnification is obtained at the movable element, and this voltage is supplied to the controller 27 as a detection signal SDp. As shown in FIG. 10, the detection signal SDp becomes 1 V at the WIDE end (f = 35 mm), for example, and TEL
It is set to be 4 V at the E end (f = 105 mm).

In this example, the image pickup screen is fixedly displayed on the screen of the small CRT of the electronic viewfinder 30, and the image frame of the photo camera is displayed. The angle of view of the video camera and the photo camera changes according to the zoom magnification, and thus the field of view changes. In order to display the frame of the photo camera on the screen of the small CRT, it is necessary to find the ratio of the field of view of the imaging screen to the field of view of the photo camera.

Here, the angle of view will be described with reference to FIG. The angle of view θ is the imaging surface size T and f value (focal length)
Can be obtained as shown in Equation 1. In FIG. 11, T 'is an image field, and L is an object distance.

[0051]

[Number 1] θ = 2tan ^-1 T / 2f imaging lens 2 is six times zoom lens of f = 7mm~42mm. When the imaging element 12 is a 1/3 inch, the horizontal size ZH of the imaging surface is 4.9 mm, the vertical size ZV is 3.69 mm, and the diagonal size ZD is 6.13 mm (see FIG. 12). ).

Therefore, the horizontal and vertical angles of view θZH and θZV at the WIDE end (f = 7 mm) are 38.6 ° and 29.5 °, respectively. On the other hand, the TELE end (f
= 42 mm) in the horizontal and vertical directions at the angle of view θZH,
θZV is 6.7 ° and 5.0 °, respectively.

The imaging lens 3 has f = 35 mm to 10 mm.
This is a 5 mm 3x zoom lens. 35mm film
, The horizontal size PH of the imaging surface is 36
mm, the vertical size PV is 24 mm, and the diagonal size PD is 43.3 mm (see FIG. 13).

Therefore, the horizontal and vertical angles of view θPH and θPV at the WIDE end (f = 35 mm) are 54.4 ° and 37.8 °, respectively. On the other hand, the horizontal and vertical angles of view θPH and θPV at the TELE end (f = 105 mm) are 19.5 ° and 13.0 °, respectively.

From the above, the relationship between the angles of view of the imaging lens 2 as a zoom lens and the imaging lens 3 as a zoom lens is as shown in Table 1.

[0056]

[Table 1]

Next, the field ratio between the imaging screen and the photo camera will be described. From FIG. 11, the field T 'can be obtained as shown in Expression 2.

[0058]

T '= 2Ltan θ / 2 Assuming that the object distance L between the imaging lens 2 of the video camera unit and the imaging lens 3 of the photo camera unit is equal, the field ratio changes depending on the angle of view θ.

Here, the horizontal and vertical angles of view θZH and θZV of the image pickup screen are shown in Table 1, so that the horizontal and vertical fields of view T′ZH and T′ZV at the WIDE end are respectively 0. 7L and 0.53L, while the horizontal and vertical fields of view T'ZH and T'ZV at the TELE end are 0.12L and 0.09L, respectively.

The angles of view θZH and θZV of the imaging screen other than the WIDE end and the TELE end can be obtained as shown in Expression 3 based on the detection signal SDv.

[0061]

Equation 3 θZH = 38.6 ° − (38.6 ° −6.7 °) (SDv−1) / 3 θZV = 29.5 ° − (29.5 ° −5.0 °) (SDv− 1) / 3 The angles of view θZH and θZV obtained by the equation
By substituting into θ, the field of view T′ZH, T′ZV can be obtained.

The horizontal and vertical angles of view θPH and θPV of the photo camera are shown in Table 1, so that the horizontal and vertical fields of view T′PH and T′PV at the WIDE end are 1.03 L, respectively. , 0.69 L, while the horizontal and vertical fields of view T′PH, T′PV at the TELE end are 0.34 L, 0.23 L, respectively.

The angles of view θ PH and θ PV of the imaging screen other than the WIDE end and the TELE end can be obtained as shown in Expression 4 based on the detection signal SDp.

[0064]

ΘPH = 54.4 ° − (54.4 ° −19.5 °) (SDp−1) / 3 θPV = 37.8 ° − (37.8 ° -13.0 °) (SDp− 1) / 3 The angles of view θPH and θPV obtained from Equation 4 are calculated as
By substituting for θ, the field of view T′PH, T′PV can be obtained.

From the above, the relationship between the field of view of the imaging screen and the field of view of the photo camera is as shown in Table 2. FIG. 14 shows the horizontal field relationship, and FIG. 15 shows the vertical field relationship.

[0066]

[Table 2]

The horizontal and vertical field ratios T'PH
/ T'ZH, T'PV / T'ZV are as shown in Table 3.

[0068]

[Table 3]

From FIG. 11, the field of view T 'can also be obtained as shown in Expression 5.

[0070]

T ′ = L × T / f The focal length f of the imaging lens 2 can be obtained as shown in Expression 6 based on the detection signal SDv.

[0071]

F = 7 mm + (42 mm−7 mm) (SDv−1) / 3 The focal length f obtained by the equation (6) is substituted into the equation (5). By substituting the direction size ZV, the horizontal and vertical fields of view T'ZH and T'ZV can be obtained.

The focal length f of the imaging lens 3 can be obtained as shown in Expression 7 based on the detection signal SDp.

[0073]

F = 35 mm + (105 mm−35 mm) (SDp−1) / 3 The focal length f obtained by the equation (7) is substituted into the equation (5). By substituting the direction size PV, the horizontal and vertical fields of view T'PH and T'PV can be obtained, respectively.

Returning to FIG. 2, in the controller 27, the field ratios T'PH / T'ZH, T'PV /
Image frame data Dm for displaying the image frame of the photo camera at a screen position corresponding to T'ZV is formed.

FIG. 16 is a flowchart showing the output processing of the image frame data in the controller 27. First,
The focal length f of the imaging lens 2 is calculated from the detection signal SDv using Expression 6 (Step 51).

Next, while substituting the focal length f into Equation 5 and substituting the horizontal size ZH and the vertical size ZV of the imaging surface into T in Equation 5, the horizontal and vertical images of the video camera are obtained. Calculate the boundaries T'ZH and T'ZV (Step 5)
2).

Next, the focal length f of the imaging lens 3 is calculated from the detection signal SDp by using Expression 7 (Step 5).
3).

Next, the focal length f is substituted into Equation 5 and the horizontal size PH and the vertical size PV of the imaging surface are substituted into T in Equation 5, so that the horizontal and vertical images of the photo camera can be obtained. Calculate the boundaries T'PH and T'PV (step 5)
4).

Next, the image fields T'ZH, T'ZV, T'PH,
Using T'PV, the horizontal and vertical field ratios of the imaging screen and the photo camera T'PH / T'ZH, T'PV / T'ZV
Is calculated (step 55).

Then, the field ratio T'PH / T'ZH, T '
The image frame data Dm is output according to PV / T'ZV (step 56). The image frame data Dm is, for example, data indicating horizontal and vertical positions at which an image frame signal is displayed. In this case, based on the horizontal and vertical display sizes of the imaging screen having a fixed size, the horizontal and vertical sizes of the image frame are determined by the field ratios T'PH / T'ZH and T'PV / T, respectively. ′ ZV
Image frame data Dm so as to be substantially equal to the size indicated by
Is formed. Here, the size in the horizontal direction is adjusted in units of the pixel pitch, and the size in the vertical direction is adjusted in units of the line pitch.

Returning to FIG. 2, the image frame data Dm output from the controller 27 is supplied to the frame signal generation circuit 32. The frame signal generation circuit 32 is supplied with the synchronization signals HD and VD from the synchronization generator 16 and also supplied with the clock CK1 from the timing generator 14. At the horizontal and vertical positions indicated by the image frame data Dm, for example, a signal of a white peak level is output from the frame signal generation circuit 32, and this signal is supplied to the adder 31 as a frame signal Sm.
It is added to the monochrome video signal SV.

As a result, the picture frame of the photo camera is displayed on the screen of the small CRT of the electronic viewfinder 30 together with the imaging screen as shown in FIG. In this case, the imaging screen is displayed at a fixed size, but the image frame of the photo camera is displayed at a position corresponding to the zoom magnification.

The size of the imaging screen is not limited to TELE.
The image is reduced in advance so that the image frame of the photo camera at the end can be displayed, and is displayed at the center of the screen of the small CRT. Although not described above, the time axis compression processing for screen reduction is performed by the encoder 28, for example.

As described above, in the present embodiment, since the image frame of the photo camera is displayed on the screen of the small CRT of the electronic viewfinder 30 based on the imaging screen of a fixed size, the zoom magnification of the video camera or the photo camera is displayed. , The field of view of the photo camera can be accurately recognized. Therefore, the shutter operation and the zoom operation of the photo camera can be accurately performed while watching the display screen of the electronic viewfinder 30.

In the above embodiment, the video camera and the photo camera are integrated, but the invention is similarly applied to a type in which a separate photo camera is fixed to the video camera. be able to. in this case,
For example, there is provided means for inputting data of the field of view T'PH, T'PV of the photo camera (data of the angle of view θPH, θPV or data of the focal length f and the image pickup plane size PH, PV) to the controller 27. Thus, any type of photo camera can be handled.

In the above-described embodiment, the zoom operation buttons 5T and 5W (zoom operation switch 42) are shared for the zoom operation of the imaging lenses 2 and 3. However, dedicated operation buttons may be provided individually. Good.

[0087]

According to the present invention, since the image frame of the photo camera is displayed on the electronic viewfinder based on the fixed size imaging screen, the field of the photo camera can be accurately determined even when the zoom magnification changes. The user can accurately perform the shutter operation and the zoom operation of the photo camera while looking at the display screen of the electronic viewfinder.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of an embodiment.

FIG. 2 is a diagram illustrating a configuration of a video camera unit.

FIG. 3 is a schematic diagram of color coding.

FIG. 4 is a diagram illustrating an output of a horizontal output register.

FIG. 5 is a diagram for explaining color signal processing.

FIG. 6 is a diagram for explaining color signal processing.

FIG. 7 is a diagram illustrating a configuration of a zoom driver of a video camera unit.

FIG. 8 is a diagram showing a relationship between a zoom angle of view of a video camera unit and a detection signal.

FIG. 9 is a diagram illustrating a configuration of a zoom driver of the photo camera unit.

FIG. 10 is a diagram illustrating a relationship between a zoom angle of view of a photo camera unit and a detection signal.

FIG. 11 is a diagram for explaining how to obtain an angle of view.

FIG. 12 is a diagram illustrating the size of an imaging surface of a 1/3 inch CCD solid-state imaging device.

FIG. 13 is a diagram illustrating an imaging surface size of a 35 mm film.

FIG. 14 is a view (horizontal direction) of an imaging screen and a photo camera.
FIG.

FIG. 15 is an image screen and a field of view of a photo camera (vertical direction).
FIG.

FIG. 16 is a flowchart showing an output processing operation of image frame data.

FIG. 17 is a diagram showing a display screen of an electronic viewfinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cabinet 2, 3 Image pickup lens 4 Eye cup 5T, 5W Zoom operation button 6 Recording button 7 Shutter button 12 CCD solid-state image sensor 14 Timing generator 16 Synchronization generator 20 Low-pass filter 21, 22 Sample hold circuit 23 Subtractor 24, 25 Changeover switch 26 Delay circuit 27 Controller 28 Encoder 29 Output terminal 30 Electronic viewfinder 31 Adder 32 Frame signal generation circuit 41, 47 Zoom driver 42 Zoom operation switch 44, 48 Variable resistor

Claims (1)

(57) [Claims] 1. A video camera having an electronic viewfinder having a zoom function and an image frame signal generating means for generating an image frame signal for displaying an image frame of a photo camera having a zoom function. Image frame position changing means for changing the image frame position of the photo camera in accordance with a change in the angle of view; and signal synthesizing means for synthesizing the image frame signal with the captured video signal. A video camera, wherein a screen is fixedly displayed and an image frame of the photo camera is displayed based on the imaging screen.