JPH06121222A - Camera - Google Patents

Abstract

PURPOSE:To prevent a failure of image pickup in advance by synthesizing a synthesis video image equivalent to a multiple exposure photography exposed already and an object going to be exposed this time and displaying the synthesized image of them on a finder. CONSTITUTION:Information of a shutter speed, a stop value and film sensitivity inputted to an EVF(electronic view finder) - system controller (step 601). Then a CCD storage time and a gain of an AGC amplifier are calculated (step 602). Then a CCD driver controls a CCD so as to store charges subjected to photoelectric conversion by the CCD for the obtained storage time (step 603). When a superimposition confirmation button is depressed, a switch PVSW is closed (step 614) to synthesize the picture. Then two pictures are superimposed, digital picture data are converted into an analog video signal by a D/A converter (step 614), band is limited by a filter (step 615) and a video signal is outputted on a display device at a proper output level (step 616).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera equipped with an electronic viewfinder.

[0002]

2. Description of the Related Art Conventionally, a finder device has been proposed which guides a light flux, which has passed through a taking lens of a camera using a silver salt film, onto an image sensor and displays an image of a subject on a display device by using an output signal of the image sensor. Has been done. Further, in Japanese Patent Application Laid-Open No. 1-133037, as shown in FIG. 9, the light flux transmitted through the taking lens 101 forms a subject image on the image sensor 109 via the mirror 108, and the image sensor 109
The electric signal of is stored in the memory device 121 via the camera control unit 120, and is stored in the monitor 12
2 or by outputting to the printer 123,
It is possible to confirm a subject image at the time of film exposure or immediately before film exposure.

As a result, a device has been devised in which it is possible to confirm whether or not the photographing has been successful immediately after the photographing.

[0004]

The conventional camera described above has the following problems.

In the above conventional example, when multiple exposure is performed, only one exposure result of multiple exposure can be confirmed.
Since it was not possible to confirm the multiple exposure state of the frame, it is not possible to confirm whether or not the image capturing at the time of multiple exposure was successful.

In the above-mentioned conventional example, in special photographing such as long-time exposure, the output of the image pickup device is saturated and a normal video signal cannot be obtained, and a general-purpose image pickup device and controller cannot be used.

Before shooting, the effect of the shutter speed, for example, the panning effect of the low shutter speed, the effect of stopping the motion by the high shutter speed, etc. are not known, so that the shutter speed is set to obtain an accurate effect. It is not possible to prevent unsuccessful shooting when doing.

The object of the present invention is to solve the aforementioned problems,
It is an object of the present invention to provide a camera that allows a camera user to confirm the shooting result on a finder screen when shooting by multiple exposure or long exposure.

[0009]

The camera according to the present invention creates a multiple-exposure image that has already been exposed by combining the images that have been captured before each exposure, and can confirm it on the electronic viewfinder, and the already-exposed multiplex image. Since it is possible to combine the composite image equivalent to the exposure photograph and the subject to be exposed this time and display it on the viewfinder,
The feature of the present invention is that it is possible to prevent shooting failures (framing, exposure, etc.) in advance because it is possible to anticipate and confirm a photograph after shooting before performing multiple exposure.

Further, in the camera of the present invention, by combining the images captured a plurality of times during the time corresponding to the long exposure time set before photographing, the image obtained when the long exposure time is obtained. By creating an image that is almost equivalent to the photo taken and displaying it in the electronic viewfinder, you can check the effect of long-time exposure before shooting, and you can prevent shooting of failed photos. It is characterized by doing so.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is an optical layout diagram of the camera of the first embodiment of the present invention, which is a sectional view of a single-lens reflex camera equipped with an electronic viewfinder. The state of FIG. 2 is a subject observation state before shooting, and the light flux that has passed through the shooting lens 1 is divided by the half mirror 2 into a light flux that proceeds to the finder system and a light flux that proceeds to the focus detection device 3. The light flux that travels to the finder system is first condensed by the condenser lenses 5a and 5b. The condenser lenses 5a and 5b are for increasing the amount of light incident on the image pickup device (CCD) 10, and particularly in the peripheral portion of the screen. It is provided to prevent a decrease in the amount of light and is arranged near the image forming surface of the taking lens 1. Then, the light flux enters the prism 6 from the condenser lens 5b, and then advances to the re-imaging optical system by the mirror 7. The re-imaging optical system includes a re-imaging lens 8 and a diaphragm 13. The diaphragm 13 is for regulating the amount of light incident on the image sensor 10, and the re-imaging lens 8 is an imaging plane ( The aerial image on the focusing surface is re-imaged on the light receiving surface of the image sensor 10. Here, condenser lens 5
The pupil position of the diaphragm 13 back-projected by a and 5b is preferably in the vicinity of the pupil position of the taking lens 1, and when the pupil positions of both are significantly different, the periphery of the light receiving portion of the image sensor 10 There is a problem that the amount of light decreases. Therefore, when a taking lens with different pupil positions is attached like a single-lens reflex camera, by adjusting the power of the condenser lens, a diaphragm 1 is provided near the pupil of the taking lens.
It is possible to move the position of the virtual pupil on which back projection of 3 is performed. For example, with a wide-angle shooting lens with a close pupil position and a telephoto lens with a far pupil position, the condenser lens 5a,
The above problem can be dealt with by changing the power of the condenser lens by replacing both or one of 5b. The prism 6 and the mirror 7 use the space efficiently, and in order to return the subject image inverted by the half mirror 2 to the original state, an odd number of times,
It is configured to reflect. However, in the case where the signal reading direction of the image pickup device 10 can be reversed to that of a normal image pickup device, or the read signals can be converted into digital data and the order of the read signals (data) can be changed in order. Does not need to limit the number of reflections.

Further, the filter 9 is an optical low-pass filter while removing the infrared component in the incident light. This is to ensure that light from the same subject is evenly incident on a set of light-receiving parts with two-dimensionally arranged R, G, and B filters in order to obtain a color image. This is to prevent infrared rays from entering the image pickup element which also reacts to light. Therefore, for example, when an infrared film is used, it is not necessary to have a visible light removing function instead of an infrared removing function, or to attach an optical low-pass filter or R, G, B filters.

The image formed on the light receiving portion of the image pickup device 10 is
It is converted into an electric signal by the image sensor 10 and output to the signal processing circuit 11. In the signal processing circuit 11, the display device 2 is based on the characteristics of the image sensor and the re-imaging optical system, the sensitivity and characteristics of the film, the exposure information, the display element, and the photographing lens information.
So that the images displayed at 0 and 30 are close to the images obtained by film when actually shot,
Signal processing is performed and a video signal is output from the output terminal 12 to the finder unit 20 or the remote control unit 30.

The finder unit 20 displays the output signal from the signal processing circuit 11 of the camera as a subject image by the liquid crystal display element 22 illuminated by the backlight illumination 24. The photographer observes the subject image displayed on the liquid crystal display element through the eyepiece lens 21.

The remote control unit 30 has a display section 31 for displaying an output signal from the signal processing circuit 11 of the camera as a subject image, and a dial 32 and a switch 33 of the operation section.
By operating ~ 36, it is possible to perform exposure control, focus control, photographing operation, etc. of the camera.

Next, circuit diagrams for explaining an embodiment of the present invention are shown in FIGS. 3 is an electric circuit diagram of the entire camera system, and FIG. 4 is a detailed electric circuit diagram of the finder system.

In FIG. 3, MPRS is a camera control device, for example, a CPU (Central Processing Unit), RO
It is a one-chip microcomputer having M, RAM, and A / D conversion functions. The computer MPRS performs a series of camera operations such as an automatic exposure control function, an automatic focus detection function, a viewfinder display function, and film winding according to the camera sequence program stored in the ROM. Therefore, the MPRS uses the synchronous communication signal and the communication selection signal to communicate with the peripheral circuit in the camera body, the lens, and the finder circuit to control the operation of each circuit and lens. The LCM is a communication buffer between the camera and the lens, and the VCM is a communication buffer between the camera and the electronic viewfinder, and the lens control microcomputer LPRS and the electronic viewfinder control microcomputer EVF_SYS-CON are communicated via these buffers.

The SDR is a drive circuit for the line sensor device SNS for focus detection and is a microcomputer MPR.
Controlled by S.

DDR is a switch detection and display circuit, which switches the display of the display member OLC for displaying the control state of the camera based on the data sent from the microcomputer MPRS.

Microcomputer EVF_SYS-C
ON controls the electronic viewfinder EVF. By communicating with the microcomputer MPRS of the camera, the brightness information of the subject is sent to the MPRS, and information such as exposure and film data and lens data, camera control status, etc. From the MPRS, and based on these data, controls the DSP of the image sensor CCD and the signal processing. Where CCD_DRIV
E is a drive circuit of the image sensor CCD, EVF_SYS
-The CCD is controlled by the command of CON. Further, the DSP is a digital signal processor for processing a video signal output from the CCD, and necessary control data and video data are stored (stored) in the storage device MEMORY. Then, the processed video signal is
Output as RGB signal or VIDEO signal,
LCD_DRIV which drives this signal
Input to E and display element LC by LCD_DRIVE
The subject image is displayed on D.

FIG. 4 is a block diagram of an electric circuit of the finder system. Here, the display element and the drive circuit for the display element are omitted.

In the figure, 201 is an image pickup element C
CDs, 202 are CCD drivers for driving the CCD 201, 203A-C are sample hold circuits (hereinafter referred to as SH circuits) for extracting RGB signal components from the output signals of the CCD 201, and 204A-C are CCDs 20.
An adjustment amplifier for adjusting the individual difference variation of 1.
205A to C are automatic gain control amplifiers (hereinafter referred to as AGC amplifiers), 206A to C are white balance amplifiers (hereinafter referred to as WB amplifiers), and 207A to C.
Is an AD converter for converting the output of the WB amplifier 206 into digital data, 208 is a digital signal processor (hereinafter referred to as DSP) that processes the digital data output from the AD converter 207, and 209A to C are films. A γ1 circuit that performs gamma correction corresponding to the photosensitivity characteristic, 201A to 201C are γ2 circuits that perform gamma correction corresponding to the light emission characteristic of the display element, and 211 is a memory 216 described below.
Memory controller for mutual communication of data with 2
Reference numeral 12 is a matrix circuit for producing data required as an output from data obtained through the memory controller, and 213 is color difference signal data RY and BY obtained from the matrix circuit 212 and modulated color signal data C Modulation circuit 214 for producing
08, character composition, video calculation, shading correction,
An arithmetic processing block 215 for performing arithmetic operations such as feedback and AE and AF, and a DSP 208 and an EVF described later.
A DSP_IF block 21 for performing data or pulse communication with the clock 222 and the EVF system controller 223, 21
Reference numeral 6 is a memory, 217A to E are DA converters for converting digital data output from the DSP 208 into analog signals, and 218A to E are filters for limiting the band of analog signals output from the DA converter 217, 219.
A to E are output level adjusting amplifiers for setting the level of the output signal, 220 is an adder, 221A to D are output buffers, 222 is a timing control for the entire system E
VF_clock, 223 E for controlling the entire system
The VF_system controller 224 is controlled by the EVF system controller 223, and the adjustment amplifier 204, the AGC amplifier 205, and the WB.
An electronic potentiometer 225 for adaptively controlling the amplifier 206 and the output level adjusting amplifier 219 is a connector for communicating with the microcomputer MPRS on the camera side.

The operation of the above configuration will be described below. Connector 2 from the microcomputer MPRS on the camera side
Based on the data sent via 25, EVF_
The syscon 223 controls the EVF_clock 222, the electronic volume 224, and the DSP 208.

First, the EVF_clock 222 and the CCD driver 202 store and read the CCD 201. The SH circuit 203 extracts RGB signal components from the output signal, and the adjustment amplifier 204 corrects the individual difference variation of the CCD 201. Then, based on the MPRS data, EVF_system controller 223, AGC amplifier 205 controlled by electronic volume 224, WB amplifier 20
6 is processed by the AD converter 207, converted into digital data by the AD converter 207, and supplied to the DSP 208.

The processing inside the DSP 208 will be described below. Inside the DSP 208, a γ1 circuit 209 performs gamma correction corresponding to the photosensitivity of the film, and a γ2 circuit 210 performs gamma correction corresponding to the light emission property of the display element.
Next, the memory controller 211, the memory 216 controlled by the memory controller 211, and the arithmetic processing block 214 perform various arithmetic processing for character synthesis, image addition, shading correction, feedback control such as AE and AF.

Here, in the character synthesizing process, the date and characters at the time of imprinting or display of shooting information such as focus detection area display, shutter speed, aperture value, exposure correction value, in-focus and out-of-focus display are displayed. Is to do.

The image addition process is used to confirm the added image in advance during multiple exposure shooting.

The shading correction is to correct the shading of the CCD 201, which is caused by the re-imaging optical system and the light amount drop in the peripheral portion of the screen caused by the main mirror of the camera.

The data on which various calculations and corrections have been performed are sent to the matrix 212 via the memory controller 211 and converted into data required as an output. In this embodiment, the luminance signal data Y and the color difference signal data R-
Y, BY, and primary color signal data R, G, B. Of these, the color difference signal data R-Y and B-Y are further converted into modulated color signal data C by the modulation circuit 213.

Here, the γ1 circuit 209, the γ2 circuit 210,
Memory controller 211, arithmetic processing block 21
4, the matrix 212 and the modulation circuit 213 are DSP_IF
EVF_SYSCON 223, EV via block 215
It is controlled by the F_clock 222, and its control is based on the data of the microcomputer MPRS on the camera side obtained via the connector 225.

With the above operation, the DSP 208 outputs the luminance signal Y, the modulated color signal C, and the primary color signals R, G, B data.

Various data obtained from the DSP 208 is D
The signal is converted into an analog signal by the A converter 217, band-limited by the filter 218, and then supplied to the output level adjusting amplifier 219 controlled by the electronic volume 224.

Here, the luminance signal Y and the modulated color signal C are level-adjusted by the output level adjusting amplifiers 219A and 219B, then added by the adder 220 and output as a video signal via the buffer 221A.

The primary color signals R, G and B are level-adjusted by output level adjusting amplifiers 219C, 219D and 219E, respectively, and then buffers 221B, 221C and 22.
It is output as R, G, and B signals via 1D.

FIG. 5 is a flow chart showing the flow of the entire camera control program. When a power switch (not shown) is turned on, power supply to the microcomputer MPRS is started, and the computer MPRS starts executing the sequence program stored in the ROM.

When the execution of the program is started by the above operation, the process proceeds to step (300) and then step (30
In 1), by pressing the release button in the first step,
The state of the switch SW1 which is turned on is detected, and SW1
When it is off, the process proceeds to step (302). In step (302), the photometric timer of the camera is operating, and if the timer value is smaller than the predetermined value (5 seconds), the process proceeds to step (310), otherwise. Step (30
In 3), all flag variables for control are cleared and initialized.

Steps (301), (302),
(303) is repeatedly executed until the switch SW1 is turned on or the power switch is turned off. S
When W1 is turned on, the process proceeds from step (301) to step (304). In step (304), the subject brightness is measured using the image sensor CCD. Perform photometric operation. When the photometry operation is completed, step (30
In step 5), the exposure value (shutter speed, aperture value) for exposing the film is calculated from the film sensitivity, the photometric data, and the exposure correction value. When step (305) is completed, the process proceeds to step (306), and the image signal of the subject image is output to the display device for the finder. In steps (307) and (308), focus adjustment operation is performed. In step (307), focus detection is performed on the subject, and in step (308), step (307) is performed.
Based on the focus detection result obtained in step 1, the lens of the taking lens is driven to adjust the focus of the subject.

In the next step (309), the count value of the photometric timer started by the ON operation of SW1 is reset, and while the SW1 is on, the count value of the photometric timer is continuously reset and the count advances. There is no such thing.

When SW1 changes from the ON state to the OFF state,
Transition to step (310). Here, the photometry, the exposure calculation, and the finder display operation in steps (304) (305) (306) are performed, and the process returns to step (301). Therefore, the photometric timer is not reset, and the count advances, and the count value reaches a predetermined value (5 seconds) or until SW1 is turned on again, steps (310), (311) ( 312) is repeatedly executed.

As described above, the function of the finder is made to operate by switching the SW1 from the off state to the on state in order to operate the image pickup device, various microcomputers, electric circuits, and display devices. This is because a large amount of power is consumed, so that it is possible to prevent unnecessary consumption of power except when photographing. Further, even if the SW1 is switched from the ON state to the OFF state, the finder function is operated for a predetermined time without immediately stopping the finder function because the force of the finger pressing the release button (not shown) during the photographing operation is used. This is for eliminating adverse effects such as loosening or when the SW1 is momentarily turned off during operation of other operating members, the previously set value, the set value is reset, and the viewfinder becomes invisible. Therefore, a stable and large power source, for example, a household AC power source (AC100
When using V) or the like, the finder function may be operated at all times by lengthening the time of the photometric timer or turning on a power switch (not shown).

Then, when the release button is pushed further from the SW1 on state and the switch SW2 is turned on, the interrupt function immediately shifts to step (320) to start the release operation in any step. .

In step (321), it is determined whether or not the lens drive is being executed. If the lens drive is stopped, the process immediately proceeds to step (322), and if the lens drive is in progress, the process waits for the stop and the process proceeds to step (322). , In step (322),
The image of the subject immediately before the exposure operation is captured by the image sensor.
Since the operation of this step will be described later, detailed description thereof will be omitted here. When the capturing of the video signal of the subject image is completed, the process proceeds to step (323).

In step (323), the quick return mirror (half mirror 2 and sub mirror 4 in FIG. 2) of the camera is moved up. This is executed by controlling the motor control signals M2F and M2R shown in FIG. In the next step (324), the previous step (30
The aperture control value already calculated in 5) is sent to the in-lens control circuit LPRS via the circuit LCM to perform aperture control.

Whether or not the mirror raising and diaphragm control in steps (323) and (324) are completed is determined in step (32).
Although it is detected in 5), the mirror up can be confirmed by a detection switch (not shown) attached to the mirror, and the diaphragm control is performed on whether or not the lens is driven up to a predetermined diaphragm value. Confirm by communication. If any of them is not completed, the process waits at this step and the state detection is continued. When both control ends are confirmed, the process proceeds to step (326).

In step (326), the shutter is controlled at the shutter speed calculated in step (305) to expose the film.

When the shutter control is completed, in the next step (327), a command is sent to the lens to open the diaphragm by the above-mentioned communication operation, and subsequently in step (328), Mirror down. Like the mirror up, the mirror down is the motor control signal M2.
This is executed by controlling the motor MTR2 using F and M2R.

At the next step (329), similarly to step (325), the process waits until the mirror down and the aperture opening are completed. When the mirror down and the aperture opening are completed, the process proceeds to step (330).

At the step (330), it is judged whether or not the multiple photographing is being carried out. If the multiple photographing is being carried out, the step (3
33), if not, step (331)
Go to. If multiple shooting is in progress, the image captured in step (322) and the memory are stored in MEMORY. The multiple shot images are combined and stored at a predetermined address in MEMORY. This is 1 by multiple shooting
In order to create the same image as the obtained photograph when the subject image is exposed multiple times on one film surface, from the beginning of multiple shooting to the present, we have created a composite image of the subject images just before the multiple exposure. I remember it. Therefore, at the time of the first exposure of multiple shooting, only the subject image immediately before this exposure is stored and is not combined with other images.

When the image synthesizing and storing operations are completed in step (333), the process returns to step (301) to carry out the next multiple photographing, and the film is not wound.

If multiple photographing is not being performed, step (33)
Move to 1) and clear the memory of the address that stores multiplex shooting. As a result, it is possible to prevent the image at this time from being combined with another image at the time of the first exposure when the multiple shooting is started. Next step (33
2), the motor control signals M1F and M1 shown in FIG.
By controlling R, one frame of film is wound up.

The above is the sequence of the entire camera. FIG. 6 is a flowchart of the photometric subroutine of the fifth step (304) (310), in which the output signal of the image pickup device CCD is integrated to measure the brightness of the subject.

When the photometry subroutine is called, the connector 225 causes the microcomputer MPRS on the camera side to perform the photometry operation to the EVF_system controller 223.
Communication is performed via. When the EVF_system controller starts the photometric operation, the process proceeds to step (401) in FIG. 6 to start driving the image sensor CCD. This makes the CCD 201 ready for the accumulation and reading operations by the EVF_clock 222 and the CCD driver 202 of FIG. In the next step (402), it is controlled by the CCD driver 202. Set the accumulation time of photoelectrically converted electric value. Here, if it is the first accumulation operation, it is set to a predetermined value, and if the CCD accumulation operation has been performed in the past, the result is fed back to perform accumulation control. When the operation is performed, the accumulation time is set based on the accumulation control data stored at the predetermined address of the storage device MEMORY.

In step (403), step (40
During the time set in 2), the operation of accumulating the electric value photoelectrically converted by the image sensor CCD is performed. When the accumulation operation is completed, the process proceeds to step (404), and the accumulated electric value is EVF.
The data is transferred in synchronization with the _clock 222 and a signal read operation is performed. The read signal is passed through the SH circuits 203A to 203C in step (405) to extract R, G, and B signal components. In the next step (406), the EVF
The AGC amplifier 205 whose gain is controlled by the electronic volume 224 controlled by the system controller 223
A to C amplify each R, G, B signal. AG at this time
Similarly to the accumulation time control, the gain of the C amplifier is set to a predetermined gain if the signal is read for the first time, and in the past,
If the signal is being read, the result is fed back and the memory MEMORY is used to perform control.
The gain of the AGC amplifier is controlled on the basis of the AGC data stored at the predetermined address.

In the next step (407), the gain of each WB amplifier 206A-C is controlled by the electronic volume control 224 controlled by the EVF_system controller 223 for white balance adjustment. R at this time,
The gains of the G and B signals are controlled based on the characteristics of the film used for shooting, and do not change depending on the color temperature of the shooting light.

Therefore, it is necessary to change the setting of each gain of the WB amplifier between the daylight film and the tungsten light film. Depending on the case, the setting may be changed depending on the type and lot of film. If the films are the same, the gain settings of the WB amplifier are not changed.

When step (407) is completed, the analog video signal is converted into digital data by the A / D converter in the next step (408). And
From the next step (409), digital, signal,
It is processed by the processor DSP208.

In step (409), gamma correction is performed corresponding to the photosensitivity and color development characteristics of the film. Therefore, when using films having different characteristics, the gamma correction characteristics must be changed. At this time, DS
The data in P208 may be changed.

In step (410), integration calculation is performed on each of the R, G, and B signals obtained as digital data.
The integrated value obtained by this integration calculation process is a value that represents the brightness (luminance) of the entire captured image, and is large for a high-luminance subject and small for a low-luminance subject.

In the next step (411), it is judged whether or not the integrated value obtained in step (410) is smaller than a predetermined value EA. If the integrated value is smaller than the predetermined value EA, the process proceeds to step (412). If not, the process proceeds to step (413). If the integrated value is smaller than EA,
The value of the digital data obtained by the A / D converter is small, and the ratio of the quantization error occurring during the A / D conversion is large in the digital data, so that the reliability of the integrated value, which is the brightness information of the subject, becomes high. Since it is low, the process proceeds to step (412) to obtain highly reliable data.

In step (412), the accumulation control data and A stored in the predetermined address of MEMORY are stored.
Change the GC data. Here, in order to increase the signal level input to the A / D converter, each data is changed so as to extend the accumulation time and increase the AGC gain. Then, when the setting for increasing the output signal from the CCD as compared with the previous time is completed, the process returns to step (402) and the same processing (operation) as the previous time is performed.

If the integrated value is not too small in step (411), the process proceeds to step (413) to determine whether the integrated value is too large. Step (413)
Then, it is determined whether the integrated value is larger than the predetermined value EB,
If the integrated value is larger than EB, the process proceeds to step (414), and if not, the process proceeds to step (415). When the integrated value is larger than EB, the signal level input to the A / D converter is higher than the operating range of the A / D converter,
It is highly possible that the A / D converted digital data is in a saturated state. In this way, the integrated value obtained in the saturated state becomes a value smaller than the actual subject luminance, and the subject luminance information is not accurate. Therefore, in step (414), the accumulation control data AGC data stored at the predetermined address of MEMORY is changed, and in the next operation, the accumulation time is shortened and the gain of the AGC amplifier is reduced. This reduces the signal level input to the A / D converter in the next operation. In this way, when the setting process for lowering the level of the output signal from the CCD is completed, the process returns to step (402) and the data is fetched again.

The above operation is repeated until the integral value is within the proper range EA≤integral value≤EB. Then, when the integrated value is within the proper range, the process proceeds to step (415).

In step (415), the accumulation time of the CCD and the gain value of the AGC amplifier for which an appropriate integrated value is obtained are stored in a predetermined address of MEMORY, and C
Data relating to the subject brightness such as the accumulation time of the CD, the gain of the AGC amplifier, and the integrated value is output to the microcomputer MPRS on the camera side, and this subroutine is returned.

EA indicating the appropriate range of the integrated value
Better results can be obtained by changing the values of EB and EB according to the photometry mode of the camera, for example, the spot photometry mode, the average photometry mode, the partial photometry mode, and the like.

FIG. 7 shows steps (305) and (31) of FIG.
It is a flowchart of the exposure calculation subroutine of 1).

When the exposure calculation subroutine is called,
The microcomputer MPRS on the camera side inputs the data relating to the subject brightness, that is, the accumulation time of the CCD, the gain of the AGC amplifier, and the integrated value of the CCD output, which are obtained by the photometry subroutine described above, and inputs them to a predetermined address of the storage device. Remember.

In the next step (502), the exposure correction amount is detected by detecting the states of the switches SWA and SWB which are turned on and off in synchronization with the operation of the exposure correction operation member (not shown).

In the next step (503), the pupil information such as the open F number of the taking lens, the effective F number, the focal length of the taking lens, and the distance to the subject (lens extension position) are communicated with the lens side microcomputer LPRS. And then step (50
In 4), by detecting the state of the switch member SWS shown in FIG. 3, data such as the sensitivity of the loaded film, the latitude, and the number of shootable images are fetched. This is because the switch member SWS is formed by the contact terminal provided in the outer periphery of the film cartridge and including the conducting portion and the non-conducting portion, which is provided in the cartridge chamber of the camera that is in contact with the signal pattern. , The film information is displayed.

In step (505), step (50
Based on the data obtained in 1) to (504), the shutter speed and aperture value for exposing the film are calculated. Then, if the shutter speed and aperture value are obtained,
This subroutine is returned at step (506).

FIG. 1 shows steps (306) and (31) of FIG.
It is a flowchart of the finder display subroutine of 2).

In this subroutine, the image obtained by the above exposure calculation subroutine is displayed on the finder or the display device, which is almost equivalent to the photograph obtained when the exposure is taken.

In step (601), the communication between the microcomputer MPRS on the camera side and the EVF_system controller is used to obtain the shutter speed, aperture value, and film sensitivity information obtained in the previous exposure calculation subroutine from the EV.
Input to F_SYSCON. Then, the EVF_syscon calculates the CCD accumulation time and the gain of the AGC amplifier in step (602) based on the data in step (601). At this time, the CCD accumulation time should be as long as possible.
Set so that the exposure time is the same as the shutter speed. It stops with a fast shutter speed when trying to shoot a moving subject.
Alternatively, it is for making it possible to confirm the effect of performing the panning at a low shutter speed. However, C
If the CD accumulation time is the same as the shutter speed,
Within the control range of the AGC amplifier, when the difference between the brightness of the photographed image and the screen of the viewfinder display does not fall within the specified range, and the correlation between the photo and the viewfinder display image is lost, the brightness of both is reduced. Prioritizing the same, the storage time of the CCD is controlled so that the brightness of the photograph and the image displayed on the finder are the same. At this time, A
The gain of the GC amplifier is controlled by the upper limit or the lower limit of the control range so that the CCD accumulation time and the shutter time are closest to each other.

In the next step (603), the CCD driver controls the CCD so that the charge time photoelectrically converted by the CCD is stored for the storage time obtained in step (602). Then, when the accumulation operation ends, step (60
The electric value stored in 4) is transferred and the signal is read.
The read signal is sampled and held in step (605), and R, G, B signals are extracted. In step (606), R, G, and G are controlled by the AGC amplifier controlled to the gain calculated in step (602).
The B signal is amplified, and the white balance is adjusted by the WB amplifier in step (607). This white balance adjustment is set according to the color development characteristics of the film and does not depend on the color temperature of the photographing light. For this reason, the white balance setting must be greatly changed between the daylight film and the tungsten light film. Further, when there is a difference depending on the type or lot of film, setting the white balance suitable for the film can further increase the correlation between the photograph and the finder image.

In the next step (608), the analog signal for which the white balance adjustment has been completed is converted into digital data by the A / D converter and input to the DSP. DS
Inside P, gamma correction corresponding to the photosensitive characteristics of the film in step (609) is performed, and then in step (61)
The gamma correction corresponding to the emission characteristics of the display element of 0) is performed.

In step (611), shading correction is performed to correct optical peripheral light amount drop caused by the interaction of the main mirror, the re-imaging optical system, and the taking lens, or the variation of each pixel output of the CCD. I do. Here, there is a difference between the position of the virtual pupil where the pupil 13 of the re-imaging lens of FIG. 2 is projected to the photographing lens side by the condenser lenses 5a and 5b and the position of the exit pupil of the photographing lens as optical peripheral light amount drop. At one point, due to this deviation of the pupil position, in the peripheral part of the screen (a part away from the optical axis),
Vignetting occurs due to mutual pupils, and the amount of light decreases. At this time, the greater the positional deviation of the pupil, the greater the decrease in the amount of light in the periphery. In order to compensate for such a decrease in peripheral light amount, the amount of peripheral light amount drop is calculated from the position and size of the entrance pupil of the re-imaging optical system, the power of the condenser lens, and the pupil information of the photographing lens to calculate the first shading. Correction data is created and the first shading correction is performed. Next, since the light flux reflected by the main mirror 2 to the CCD 10 cannot reflect all the light flux of the taking lens, the light quantity of a part of the screen (especially the upper part of the screen) is reduced. Therefore, in order to compensate for this, the peripheral light amount reduction amount by the main mirror is calculated from the position information of the main mirror and each pupil position information, the second shading correction data is created, and the second shading correction is performed.

At the next step (612), the state of the switch PVSW which is turned on and off in synchronization with the operation of the multiple confirmation button (not shown) is detected. If PVSW is on, the process proceeds to step (613). Otherwise, proceed to step (614). If the multiplex confirmation button is pressed, the PVSW is turned on and the process proceeds to step (613) to combine the images. The image used for this image composition is
It is the image recorded in step (333) and the image obtained in step (603) in FIG. 5, and the two image signals are superimposed, and the process proceeds to step (614). Therefore, in the case of the first multiple exposure, since there is no image to be combined in step (613), the image data before and after the processing in step (613) are the same.

In step (614), the digital image data is output as an analog video signal by D / A conversion, in step (615) the band is limited by the filter, and in step (616) an appropriate signal is output. The video signal is output to the display device at the output level. Then, in step (615), the display device 20 or 30 of FIG.
If the subject image is displayed by and the multiple confirmation button is operated, the same image as that obtained when multiple exposure is performed can be confirmed in the viewfinder.

FIG. 8 is a flowchart of the image capturing subroutine of step (322) in FIG. 5, which is a subroutine for capturing the subject image immediately before film exposure.

C in steps (701) to (711)
CD control and signal processing are performed in step (601) of FIG.
To (611), the detailed description will be omitted here.

In step (712), step (70
The image information obtained by converting (processing) the image information obtained in 3) into an image equivalent to a photograph obtained by the exposed film is stored in a predetermined address of MEMORY, and this subroutine is returned.

The image data stored in this subroutine is used when performing image composition in step (333) in FIG. 5, and is cleared in step (311) during normal shooting.

Next, a second embodiment of the present invention will be described with reference to FIGS. Since the hardware configuration of the camera according to the present embodiment is almost the same as that of the first embodiment, FIGS. 2 to 4 will be applied to the description of the present embodiment regarding the hardware of the camera. The description of the same components and functions as those described in the first embodiment will be omitted.

FIG. 11 is a main flow chart showing the whole control program of the camera of this embodiment. In the following explanation, only the parts different from the main flow chart of the first embodiment shown in FIG. 5 will be explained.

In FIG. 11, the operation sequence up to step 320 is the same as that of the camera of the first embodiment of FIG. 5, and therefore its explanation is omitted.

In FIG. 11, in step (321), it is determined whether or not the lens is being driven. If the lens is stopped, the process immediately proceeds to step (322). If the lens is being driven, the process waits until the lens is stopped in step (322). Go to step (3
In 22), the quick return mirror (half mirror 2 and sub mirror 4 in FIG. 2) of the camera is moved up. This is the motor control signal M2F, M shown in FIG.
It is executed by controlling 2R. Next step (32
In 3), the aperture control value that has already been calculated in the previous step (305) is passed through the circuit LCM to the in-lens control circuit L.
It is sent to the PRS to control the aperture.

Whether or not the mirror up and diaphragm control in steps (322) and (323) are completed is determined in step (32).
Although it is detected in 4), mirror up can be confirmed by a detection switch (not shown) attached to the mirror, and the aperture control determines whether or not the lens has been driven to a predetermined aperture value. Confirm by communication. If any of them is not completed, the process waits at this step and the state detection is continued. When both control ends are confirmed, the process proceeds to step (325).

In step (325), the shutter is controlled at the shutter speed calculated in step (305) to expose the film.

When the shutter control is completed, in the next step (326), a command is sent to the lens to open the diaphragm by the above-mentioned communication operation, and subsequently in step (327), Mirror down. Like the mirror up, the mirror down is the motor control signal M2.
This is executed by controlling the motor MTR2 using F and M2R.

At the next step (328), similarly to step (324), the process waits until the mirror down and the aperture opening are completed. When the mirror down and the aperture opening are completed, the process proceeds to step (329).

In step (329), one frame of film is wound by controlling the motor control signals M1F and M1R shown in FIG. The above is the sequence of the entire camera.

FIG. 10 shows the step (306) in FIG.
It is a flowchart of the finder display subroutine of (312).

This broutine displays on the viewfinder or the display device an image obtained by the exposure calculation sub-routine, which is almost equivalent to a photograph obtained when the exposure is taken.

In step (601), the shutter speed, aperture value, and film sensitivity information obtained in the previous exposure calculation subroutine are transferred to the EV through communication between the microcomputer MPRS on the camera side and the EVF system controller.
Input to F_SYSCON.

In the next step (602), the state of the preview switch PVSW (not shown) is detected. If the PVSW is in the on state, the process proceeds to step (603), and if it is in the off state, the process proceeds to step (604). The preview switch PVSW sets whether or not to perform an operation of displaying a video image equivalent to a photographic image obtained when shooting is performed with the currently set exposure. When the preview switch PVSW is in the on state, the preview switch PVSW is set. When it is off, the preview operation is not performed.

If the preview switch PVSW is in the on state, it is judged whether or not the shutter speed Tv set in step (603) is larger than 1/60. If the shutter speed Tv is larger than 1/60, the step ( If not, go to step (604). This is because the clock signal for controlling the image pickup device CCD and the display device have the same signal form as that of a television broadcast, a video camera, etc., NTSC, PAL, etc., so that the system deployment with other devices becomes easy. NTSC60 to take advantage of
Hz and PAL (50 Hz) are set to be performed with the same synchronization signal. Therefore, 1/60 seconds or 1 /
To obtain an exposure image with a shutter speed slower than 50 seconds, special control and processing are required, and otherwise it can be handled within the normal NTSC 60 Hz control range. Therefore, when the shutter speed is slower than 1/60 second, a step (614) is performed to perform special processing.
If not, otherwise go to step (604) to perform normal control.

In step (604), step (60
The accumulation time of the CCD and the gain of the AGC amplifier are calculated based on the data of 1). At this time, the CCD accumulation time is set to be the same exposure time as the shutter speed, and the gain of the AGC amplifier is set so that an image having the same brightness as a photograph can be obtained from the film sensitivity and exposure at this time.
It stops with a fast shutter speed when trying to shoot a moving subject. Alternatively, it is for making it possible to confirm the effect of performing the follow shot at a low shutter speed.

In the next step (605), the image sensor C
The CD is controlled and the image signal is taken in. First, the CCD is controlled by the CCD driver so that the charge time photoelectrically converted by the CCD is accumulated for the accumulation time obtained in step (604), and the accumulation is performed. When the operation is completed, the accumulated electric value is transferred to R, G, in synchronization with the synchronization signal of the clock.
Each signal of B is taken out. Then, each signal is amplified by the AGC amplifier, and then the white balance is adjusted by the WB amplifier. Then, step (605) is completed. Here, the gain of the AGC amplifier is calculated in step (604), and the gain of the WB amplifier is set according to the color development characteristics of the film and does not depend on the color temperature of the photographing light.

When the capturing of the image signal is completed in step (605), this analog image signal is converted into digital data by the A / D converter in step (606) and input to the DSP.

In the next step (607), gamma correction corresponding to the photosensitive characteristics of the film is performed, and in the next step (608), gamma correction corresponding to the light emitting characteristics of the display element is performed.

In step (609), shading correction is performed to correct optical peripheral light amount drop caused by the interaction of the main mirror, the re-imaging optical system, and the taking lens, or the variation of each pixel output of the CCD. To do.
Here, as an optical peripheral light amount drop, there is a difference between the position of the virtual pupil where the pupil 13 of the re-imaging lens of FIG. 2 is projected to the photographing lens side by the condenser lenses 5a and 5b and the position of the exit pupil of the photographing lens. At some point, due to this pupil position shift, in the peripheral part of the screen (where it is far from the optical axis center),
Vignetting occurs due to mutual pupils, and the amount of light decreases. At this time, the greater the positional deviation of the pupil, the greater the decrease in the amount of light in the periphery. In order to compensate for such a decrease in peripheral light amount, the amount of peripheral light amount drop is calculated from the position and size of the entrance pupil of the re-imaging optical system and the pupil information of the power photographing lens of the condenser lens, and the first shading correction data is calculated. Is created and the first shading correction is performed. Then the main mirror 2
Since the light flux reflected by the CCD 10 cannot reflect the entire light flux of the taking lens, the light amount of a part of the screen (especially the upper part of the screen) is reduced. Therefore, in order to compensate for this, the peripheral light amount drop due to the main mirror is calculated from the position information of the main mirror and each pupil information, and the second shading correction is performed.

In the next step (610), the digital image data is output as an analog video signal by D / A conversion, the band is limited by the filter in step (611), and the value is adjusted in step (612). The video signal is output to the display device at various output levels. Then, in step (613), the subject image is displayed by the display device 20 or 30 of FIG.

If the preview switch is on and the shutter speed is slower than 1/60 second, the process proceeds to step (614).

At step (614), the number N of times of image capture corresponding to long-time exposure is calculated. This is 60
The number of images required to combine multiple images so that the same effect as the exposure time (shutter speed) can be obtained when capturing images in Hz, for example, Can be obtained by N = Tv × 60.
However, N = Tv × 50 for 50Hz such as PAL
Becomes

In the next step (615), the CCD storage time and the gain of the AGC amplifier required to obtain the brightness equivalent to that of the photograph are obtained from the shutter speed, aperture value, and film sensitivity. The amount of light taken in is 1 /
Set to N, where CC for long exposure
When the D accumulation time and the gain of the AGC amplifier are calculated, if the calculation is performed in consideration of the exposure decrease due to the reciprocity law failure of the film, the correlation between the finder image and the photograph can be further improved.

At step (616), the memory for storing the image data is cleared and the data stored before that is erased. Then, in the next step (617), the count value of the counter 1 is reset to "0".

At step (618), the count value of the counter 1 is incremented by 1, and the process proceeds to step (619). At step (619), the value obtained at step (615) is obtained in the same manner as at step (605). , Accumulation time, A
The image signal is taken out from the CCD based on the gain of the GC amplifier.

In the next step (620), the analog image signal is converted into digital image data by the A / D converter and input to the DSP. Inside the DSP, a gamma correction corresponding to the photosensitive characteristic of the film is performed in step (621), and a gamma correction corresponding to the light emitting characteristic of the display element is performed in the next step (622).

In step (623), step (60
As in 9), shading correction is performed to correct optical peripheral light amount drop caused by the interaction of the main mirror, the re-imaging optical system, and the taking lens, and the variation in the output of each pixel peculiar to the CCD.

In the next step (624), the image stored in the memory and the image captured this time are combined.
For this reason, since the memory is cleared when the first image is captured, the image after combining is the same as the image when step (623) is completed, and the counter 1 is 2 or more. If so, it will be a superposition of multiple images. Then, in step (624),
For the image that has been subjected to the combining process, once step (625)
At, the image is stored in the memory. In the memory area for storing images, the image used for image composition is stored.Each time an image is captured, the contents of a predetermined area of this memory are rewritten to the same content. Since the memory is used, the memory capacity can be effectively used.

When step (625) is completed, the process proceeds to step (626), where the image data stored in step (625) is transferred to the D / A converter.
It is converted into an analog image signal and output. Then, in step (627), this signal is subjected to band limitation by a filter, and in step (628), a video signal is output to the display device at an appropriate output level. Then, in step (629), the subject image subjected to the combining process is displayed by the display device 20 or 30 of FIG.

At the step (630), the count value of the counter 1 is compared with N to determine whether or not the images have been captured, combined and displayed a predetermined number of times N, and the steps (618)- The operation of step (629) is repeated until the count value reaches N.
Go to 31) and return from this subroutine.

In the embodiment shown in FIG. 10, it is possible to see how the subject image changes during the long exposure time. Therefore, in order to obtain the photograph desired by the photographer, the exposure time should be longer. This makes it easier to see if you want to shorten or lengthen the shot, and not only can you predict and prevent failures before shooting, but you can also easily see how you can get the photo you want. .

FIG. 12 shows the third embodiment. FIG. 12 shows a finder display subroutine. The other flow charts (main routine, subroutine) and the configuration of the camera are the same as those of the second embodiment. The feature of the third embodiment is that when the preview switch is turned on, it is turned on. However, while the preview switch is on, the same image (still image) will continue to be displayed while the preview switch is on, so the photographer can fully consider the expected photographic image. It was made possible.

When the finder display subroutine is called, at step (701), the shutter speed, aperture value, film and film obtained by the previous exposure calculation subroutine are communicated by communication between the microcomputer MPRS on the camera side and the EVF system controller. Enter sensitivity information into EVF_SYSCON.

In the next step (702), the state of the preview switch PVSW (not shown) is detected, and PVSW is detected.
Is on, the process proceeds to step (713), and if it is off, the process proceeds to step (703). Here, the preview switch PVSW displays an image equivalent to a photographic image as in the second embodiment. This is for setting whether or not to do.

If the preview switch is off,
Proceeding to step (703), the accumulation time of the CCD and the gain of the AGC amplifier are calculated based on the data of step (701). At this time, the gain of the AGC amplifier and the accumulation time of the CCD are calculated from the film sensitivity and the exposure so that an image having almost the same brightness as the photograph can be obtained.

In the next step (704), the image sensor C
The CD is controlled and the image signal is taken in. The accumulation time obtained in step (703), the electric charge of the CCD is accumulated, and when the accumulation operation is completed, the accumulation is performed in synchronization with the clock synchronization signal. Then, the R, G, and B signals are extracted, and each signal is amplified by the AGC amplifier set to the gain obtained in step (703), and the white balance adjustment is performed by the WB amplifier. If done, this step is completed. Here, each value of the white balance adjustment by the WB amplifier corresponds to the coloring characteristic of the film used and does not depend on the color temperature of the photographing light.

When the capturing of the image signal is completed, in step (705), the analog image signal is converted into digital data by the A / D converter and input to the DSP.
The image data taken in the DSP is subjected to various processes by the arithmetic circuit and the memory.

The image data taken in the DSP is
First, gamma correction corresponding to the photosensitivity of the film in step (706) is performed, and in the next step (707),
Gamma correction corresponding to the light emission characteristics of the display element is performed.

In step (708), shading correction is performed to correct the optical peripheral light amount drop caused by the interaction of the main mirror, the re-imaging optical system, and the taking lens, and the variation in the output of each pixel of the CCD. .

After various processing, the image data is converted into an analog image signal by the D / A converter in step (709), and the band is limited by the filter in step (710). ) Output the video signal to the display device at an appropriate output level, and at step (712), the display device 20 or 30 of FIG.
The subject image is displayed by and the process proceeds to step (731).

When the preview switch PVSW changes from the off state to the on state, the process proceeds to step (713).

At step (713), the number N of times of image capturing is calculated. At this time, the shutter speed is 1
/ 60 seconds or less, N = 1, and when the shutter speed is slower than 1/60 seconds, N = Tv × 60,
Here, Tv is the shutter speed. The value of N is an integer, and the part after the decimal point is truncated.

In the next step (714), the shutter speed, aperture, and film sensitivity are set so that the brightness of the image and the image obtained by combining the images N times, combining and superimposing them are almost the same. The accumulation time of the CCD and the gain of the AGC amplifier are calculated. Where N is 2
In the above case, the accumulation time of the CCD and the gain of the AGC amplifier may be obtained from the aperture value and the film sensitivity.

When N = 1, the accumulation time is set to be the same as the shutter speed, and the gain of the AGC amplifier is determined so that the brightness of the photograph and that of the finder are the same.

At step (715), the memory for storing the image data is cleared and the image data stored before that is erased. Then, the next step (71
In 6), reset the count value of counter 1 to "0".
To

At the next step (717), the count value of the counter 1 is incremented by 1, and the process proceeds to step (718).

In step (718), in step (71
The CCD accumulation operation is performed for the CCD accumulation time obtained in 4), the output signal of the CCD is amplified by the gain of the AGC amplifier obtained in step (714), and the white balance is adjusted.

At the next step (719), the analog image signal extracted at step (718) is converted into an A / D signal.
Converted to digital image data by the converter, DSP
Taken in. In the DSP, first, step (72
Gamma correction for correcting the photosensitivity characteristic of the film of 0) is performed, and then gamma correction for correcting the light emission characteristic of the display element of step (721) is performed.

In the next step (722), as in step (708), the main mirror optical system, the re-imaging optical system,
Shading correction is performed to correct an optical peripheral light amount decrease caused by the interaction of the photographing lenses and a variation in each pixel output of the CCD.

In the next step (723), the image stored in the memory and the image captured this time are overlaid,
To synthesize. For this reason, since the memory is cleared when the first image capture is performed, the images before and after the synthesis are not changed. Therefore, if the first image capture is performed, the synthesis process may not be performed. good. If the count value of the counter 1 is 2 or more, an image obtained by superposing a plurality of captured images can be obtained. When the image combining process is completed, the image is stored in a predetermined memory in step (724). Here, the memory area for storing the image uses the same area as the memory for storing the image used in the image composition in step (723), and rewrites the stored content each time the image composition processing is performed. In this way, you can save memory.

In the next step (725), the image data stored in step (724) is converted into an analog image signal by the D / A converter and output. Then, this image signal is subjected to band limitation by a filter in step (726), and a video signal is output to the display device at an appropriate output level in step (727).

In step (728), the image signal output by the display device 20 or 30 of FIG. 2 is displayed as a subject image.

At step (729), it is judged whether or not the images have been captured and combined a predetermined number of times N times, and if the count value of the counter 1 and N are equal, step (73)
0), if the count value has not reached N, the process returns to step (717), and steps (717) to (728) are repeatedly executed until the count value reaches N.

When the count value becomes N, step (73
0), in step (730), the state of the preview switch PVSW is detected. If the preview switch is in the on state, the process returns to step (725), and if it is in the off state, the process proceeds to step (731) to execute this subroutine. To return. Here, if the preview switch is in the ON state, steps (725) to (728) are repeatedly executed, whereby the image stored in the memory is continuously displayed as a still image on the display device.

As described above, in the third embodiment, the image obtained when the preview operation is performed is kept displayed. Therefore, the photographer should sufficiently consider whether or not the intended photograph can be taken. I was able to do it.

[0138]

As described above, according to the present invention, the following effects can be obtained.

Since the image already exposed on the viewfinder at the time of multiple exposure and the image to be exposed this time can be combined and viewed, the layout and the exposure can be easily set at the time of multiple exposure, which is a failure. Can be prevented.

By providing means for synthesizing and displaying images corresponding to the exposure time set before photographing, it is possible to easily confirm the effect of the exposure time such as long-time exposure and high-speed shutter before photographing. It is possible to prevent the shooting of failed photographs.

[Brief description of drawings]

FIG. 1 is a flowchart of a finder display subroutine according to the first embodiment of the present invention.

FIG. 2 is a configuration diagram of a camera having an electronic finder according to the first embodiment of the present invention and an explanatory diagram of a finder image display device.

FIG. 3 is an electric circuit diagram of the entire camera system according to the first embodiment of the present invention.

FIG. 4 is a detailed electric circuit diagram of the electronic finder section according to the first embodiment of the present invention.

FIG. 5 is a flowchart of a main routine according to the first embodiment of the present invention.

FIG. 6 is a flowchart of a photometric subroutine according to the first embodiment of the present invention.

FIG. 7 is a flowchart of an exposure calculation subroutine according to the first embodiment of the present invention.

FIG. 8 is a flowchart of an image capturing subroutine according to the first embodiment of the present invention.

FIG. 9 is a configuration diagram of a camera including a conventional electronic viewfinder.

FIG. 10 is a flowchart of a finder display subroutine of the camera of the second embodiment of the present invention.

FIG. 11 is a flowchart of a main routine of the camera of the second embodiment of the present invention.

FIG. 12 is a flow chart of a finder display subroutine of the camera of the third embodiment of the present invention.

[Explanation of symbols]

1 ... Shooting lens 2 ... Half mirror 3 ... Focus detection device 5a, 5b ... Condenser lens 6 ... Prism 7 ... Mirror 8 ... Re-imaging lens 9 ... Filter 10 ... Image sensor 13 ... Aperture 11 ... Signal processing circuit 12 ... Output terminal 20 ... Finder unit 21 ... Eyepiece lens 22 ... Liquid crystal display element 30 ... Remote control unit 31 ... Display unit 32 ... Dial 33-36 ... Switch 201 ... CCD 202 ... CCD driver 203A-203C ... Sample hold circuit 204A-204C ... Adjustment amplifier 205A ~ 205
C ... AGC amplifier 206A-206C ... White balance amplifier 207A-207C ... AD converter 208 ... Digital signal processor 209A-209C ... γ1 circuit 210A-210
C ... γ2 circuit 211 ... Memory controller 212 ... Matrix circuit 213 ... Modulation circuit 214 ... Arithmetic processing block 215 ... DSP-IF block 216 ... Memory 217A to 217E ... DA converters 218A to 218.
E ... Filter 219A to 219E ... Output level adjusting amplifier 220 ... Adder

Claims (7)

[Claims] 1. An image pickup device on which a subject image is formed during finder observation, a storage device for storing an output of the image pickup device, an image synthesizing device for synthesizing a plurality of images stored in the storage device, Display means for displaying a combined image combined by the image combining means, and when multiple-exposure shooting is performed, the subject image at the time of multiple-exposure is stored in the storage means, and the image stored by the storage means and the imaging element A camera characterized in that it is configured to synthesize the output image of 1. by the synthesizing means and display the synthesized image on the display means. 2. The camera according to claim 1, further comprising an operation member for operating the image synthesizing means. 3. A storage time equivalent to a set exposure time, in a camera having an image pickup device on which a subject image is formed during finder observation, and a display device for displaying the image formed on the image pickup device. The camera is provided with a control means for controlling the image sensor and processing the output signal. 4. The control means has a function of controlling so that the accumulation time of the image sensor and the set exposure time (shutter speed) become equal when the shutter speed is higher than a predetermined value. 4. The method according to claim 3,
Camera. 5. The control means synthesizes an image having an effect equivalent to a set exposure time by combining output signals of a plurality of times of the image pickup device when the shutter speed is lower than a predetermined value. 4. The camera according to claim 3, which has a function of displaying on a display device. 6. An image pickup device on which a subject image is formed during finder observation, a display device for displaying an output signal of the image pickup device, and an image pickup device of the image pickup device so as to have a storage time equivalent to a set exposure time. An exposure time that is set only when the operating member is operated, has a control means for controlling and processing the output signal, and an operating member provided for causing the controlling means to perform a predetermined operation. A camera which controls the image pickup device and processes an output signal so as to obtain a time effect equivalent to. 7. The camera according to claim 6, wherein the same image is displayed as a still image on the display device while the operation member is being operated.