JPH01239536A - Electronic camera - Google Patents

Abstract

PURPOSE:To always attain the desired control of exposure by correcting exposure according to an appropriate exposure condition computed based on a signal outputted from an image pickup element after performing provisional exposure to the image pickup element, and inhibiting the correction of exposure by means of the provisional exposure in the case where the exposure is manually set. CONSTITUTION:An arithmetic means 2 is provided, which computes the appropriate exposure condition based on the signal outputted from the image pickup element 1 after performing the provisional exposure to the image pickup element 1. Moreover, a correction means 3 for correcting the exposure according to the computed condition and a correction inhibiting means 4 for inhibiting the correction of exposure by means of the provisional exposure in the case where the exposure is manually set are also provided. Thus, erroneous correction caused by inverse correction, etc., can be prevented and the desired appropriate control of exposure where photographer's intention is established can be always performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic camera that allows exposure correction using temporary exposure and manual exposure setting.

(Prior Art) Electronic cameras that record images on magnetic disks using image sensors such as CCDs require higher exposure precision than general silver halide photography cameras that use silver halide. For this reason, various proposals have been made.For example,
Exposure control is performed such that preliminary exposure is performed on the image sensor before the main exposure, and the amount of exposure is corrected based on the level of a signal output from the image sensor at that time. In addition, if the photographer is an experienced photographer, the exposure may be set manually, and proper exposure can be obtained by controlling the stiffness.

(Problem to be solved by the invention) However, in conventional electronic cameras, when temporary exposure is performed, exposure compensation is always performed according to the output level of the image sensor at that time. Even when the exposure is set, IIg-correction is sometimes performed using temporary exposure, which poses a problem in that desired exposure control cannot be performed.

The present invention has been made in view of these problems, and provides an electronic camera that prohibits re-correction using temporary exposure when exposure is manually set, and allows desired exposure control at all times. It is something to do.

[Means to solve the problem]

The electronic camera of the present invention includes a calculation means for calculating appropriate exposure conditions based on a signal output from the image sensor after performing temporary exposure on the image sensor, and a correction means for correcting the exposure according to the calculation conditions. In addition, when the exposure is manually set, a correction prohibiting means is provided for prohibiting exposure correction using the recorded temporary exposure.

Further, the electronic camera of the present invention is provided with the above-mentioned one-stage operator and a correction means, and is also provided with a correction prohibition means for prohibiting exposure correction by provisional exposure during flash photography.

[Function] In the electronic camera of the present invention, when the exposure is manually set, the exposure correction by provisional exposure is M and V, so that the desired exposure control is always +7 degrees.

Further, in another electronic camera of the present invention, exposure correction by temporary exposure is prohibited during flash photography, so desired exposure control is similarly possible.

[Fruit’es example]

FIG. 1 is a block diagram showing one embodiment of the present invention.

In the figure, 1 is a CCD which is an image sensor, 2 is this CC
Calculating means for calculating appropriate exposure conditions based on the signal output from the CCD 1 after performing temporary exposure on the CCD 1, 3
4 is a correction means that corrects the exposure according to the calculation conditions, and 4 is a correction prohibition means that prohibits exposure correction using the provisional exposure when the exposure is manually set. It is designed to stop calculation. 5.
6 is a shutter and an aperture for controlling the exposure, and 7 is a driver for driving these shutters 5 and 6.

The electronic camera with the above configuration is capable of exposure correction using provisional exposure and manual exposure setting as described in (2) above, and, although not shown, the image signal from the CCD 1 is transmitted to the magnetic field contained in the jacket. It can be recorded onto a disc. The signal processing circuit 8 that processes the image signal also includes the operator stage 2, and the system controller 9 that controls the entire system includes the correction means 3 and the correction prohibition means 4.

FIG. 2 shows the overall structure of an electronic camera having the above structure. In the figure, 10 is an imaging lens, 11 is a modulation/recording circuit that records the image signal from the CCD 1 read out by the signal processing circuit 8 onto the above-mentioned magnetic disk 13 via the head 12, and 14 rotates the magnetic disk 13. A seat motor, 15 is a driver that drives the seat motor 14, 16 is a flash that illuminates the subject, and 17 is an AE sensor that performs photometry. When the photometry switch 18h) is turned on, photometry is performed. 19 is a switch for shooting, 20 is a switch for temporary light (EXP, C), and 21 is a switch for manual setting (I
NST-EXP, C) Switch, 22.23 is a switch for manually adjusting exposure (UP, DOWN), 24
is an LCD that displays the operating status of each part.

Next, the operation will be explained.

First, during normal shooting, the switch 18 is turned on to perform photometry using the AE sensor 17, and then the switch 19 is turned on.
Start the first cedar. When the system controller 9 detects that the switch 19 is turned on, the system controller 9 drives the seat motor 14 via the driver 15 to rotate the magnetic disk 13. At the same time, the aperture value of the lens lO and the shutter speed (speed) from the AE sensor 17 (based on the
The shutter 5 and the aperture 6 are driven via the driver 7 according to the exposure conditions. This results in
The image signal of the subject will be stored in the CCDI. The image signal from the CCD 1 is read out and processed by the signal processing circuit 8, and then sent to the head 12 by the modulation/recording circuit 11.
The data is recorded on the disc 13 via the.

Next, a case will be described in which exposure correction using temporary exposure, that is, re-exposure correction is performed. At this time, for example, if the upper half of the subject is very bright, shutter 5 will cause the CCD to
The upper half of the camera 1 is shielded from light, and exposure is performed according to the shutter speed determined (calculated) in advance based on a signal from the AE sensor 17. Then, the signal processing circuit 8 integrates the output of the CCD 1 only in the portion corresponding to the effective angle of view (viewing angle),
The integrated (averaged) signal is A/D (analog/digital) converted by the system controller 9 to check the exposure level. At this time, if the level of the A/D converted signal has not reached a sufficient level, the shutter speed is corrected accordingly to prepare for the main exposure for actual photographic recording.

By using the above exposure compensation, it is possible to prevent the phenomenon of underexposure due to the influence of very bright subjects such as the sky or the sun above the above angle of view, and to perform appropriate exposure control for the part of the subject that you originally want to photograph. I can do it.

When the photographer manually sets the exposure, the switch 22 or 23 is pressed once with the switch 21 in FIG. 2 turned on. At this time, press the UP switch 22 every 1-! The system controller 9 determines the shutter speed and aperture value so that the exposure is over-exposed in steps 4e and each time the DOWN switch 23 is pressed, the exposure is corrected in steps e-v or under-exposed. Ru.

This exposure control allows the user, that is, the photographer, to finely adjust the exposure according to the subject, and to obtain more appropriate exposure for each scene.

Here, when photographing is performed according to a normal sequence, when an exposure amount of +1.5ev is set by the above-mentioned manual setting, the system controller 9 adds +1.5ev to the photometric value by the AE sensor 17. Determine the shutter speed and aperture value. In this case, since manual setting is being performed, the re-calculation based on the temporary exposure is prohibited, and the process proceeds directly to the actual exposure. After that, the closest shadow recording is performed according to the normal sequence. Therefore, after the photographer manually sets an appropriate exposure, re-correction using temporary exposure is not performed, and reverse correction is prevented. Therefore, desired exposure control can always be performed while respecting the photographer's intention.

Note that prohibition of exposure compensation using temporary exposure is not limited to manual settings as described above, but also when using flash I! using the flash 16. It may also be prohibited when taking pictures.

FIG. 3 is a flowchart showing the above-mentioned operation.

Hereinafter, details of the operation of this embodiment will be explained according to this flowchart.

First, in step S1, it is determined whether or not the photographing switch (release) 19 is turned on, and when it is turned on, the shutter time (Tv) and aperture value (AV) that have been set manually or automatically are read (step S2). .

Next, in step S3, it is determined whether the manual mode is set using the manual setting switch 21, and if it is not the manual mode, it is further determined whether the flash mode using the flash 16 is set using the flash mode switch (not shown). It is determined in step S4.

If it is not the flash mode in step S4, the process advances to step S5 and provisional exposure is performed. That is, the aperture is moved to the aperture value corresponding to the AV, and in that state, the shutter 5 or the CCD 1
Temporary exposure equivalent to that of a TV is performed by electronic storage time control.

Thereafter, in step S6, actual aperture photometric data of the subject is obtained from the image signal obtained by the CCD 1 at this time, and Tv is corrected to TV+ΔTv based on the kneading.

On the other hand, if it is determined in step S4 that the flash mode is set, in step S7 the predetermined flash mode is set to a certain aperture value AV (e.g. aperture value), shutter speed TV (
For example, set it to full-open seconds).

If it is determined in step S3 that the motor is a manual mote, the process directly advances to step S8.

In step Sa, when in manual mode, the exposure is based on T v and A v set in step S2, when in flash mode, it is based on TV and AV for flash mode, and when it is neither manual mode nor flash mode, it is based on temporary exposure. , the shutter 5 and the aperture 6 are started to be driven based on the corrected Tv and the AV set in step S2.

Thereafter, it is checked again in step S9 whether or not the flash mode is on, and if it is not the flash mode, it is checked in step Sll whether the TV has elapsed, and if it has elapsed, the shutter 5 is closed in step 512, and the shutter 5 from the driver 7 is released in step S13. CCD in synchronization with the vertical synchronization signal of the standard television signal
1, and this signal is recorded on a magnetic sheet 13 which also rotates in synchronization with the synchronization signal.

On the other hand, if it is determined in step 5 that the flash mode is selected, a flash light is emitted in step SIO and a dimming operation is performed, and then the process proceeds to step Sl+.

(Effects of the Invention) As explained above, according to the present invention, exposure compensation using provisional exposure is prohibited when manually setting the exposure or during flash photography, thereby preventing erroneous compensation due to reverse compensation, etc. This has the advantage that it is possible to always perform desired and appropriate exposure control that takes into account the photographer's intentions.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an overall configuration diagram of an electronic camera having the configuration shown in FIG. 1, and FIG. 3 is a flowchart showing the operation of exposure control. 1...COD (imaging floor-f)2...
Calculating means 3... Correction means 4... Correction inhibiting means 5... Shutter 6... Aperture 8... Signal processing circuit 9... ...System controller 10 ... Lens 17 ... AE sensor

Claims (2)

[Claims] (1) It is equipped with a calculation means for calculating appropriate exposure conditions based on a signal output from the image sensor after preliminary exposure to the image sensor, and a correction means for correcting the exposure according to the calculation conditions, and a manual 1. An electronic camera characterized in that an electronic camera is provided with a correction prohibiting means for prohibiting exposure correction based on the provisional exposure when an exposure is set. (2) A calculation means for calculating appropriate exposure conditions based on a signal output from the image sensor after performing temporary exposure on the image sensor, and a correction means for correcting the exposure according to the calculation conditions, and a flash photography An electronic camera characterized in that an electronic camera is provided with a correction prohibiting means for prohibiting exposure correction based on the provisional exposure at times.