JPH03252636A - Camera provided with learning function - Google Patents

Abstract

PURPOSE:To make a camera automatically learn a final exposure correction value which is set by a photographer by making the camera learn only the exposure correction value which is used for exposing only in the case of actually exposing. CONSTITUTION:A proper correction value EV is decided by the camera by using an exposure arithmetic means 2 based on a photometry value BV which is obtained by a photometry means 1, and the photographer manually corrects an exposure value EV by using an exposure correction value setting means 3 if necessary. An exposure correction value BV4 is not always learned, only the exposure correction value BV4 which is used for exposing is stored in an exposure correction value storing means 4 only in the case of actually exposing, and it is learned. Thus, the final exposure correction value which is set by the photographer can be automatically learned by the camera.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a camera having a learning function, and is put to practical use as a camera having an automatic exposure correction function.

[Prior Art] Conventionally, there are cameras on the market that have an automatic exposure control function that measures the light of a photographic screen in various ways and determines an appropriate exposure value using a predetermined algorithm based on the photometered value. However, some photographers may want to overexpose or underexpose the exposure value determined by the camera. In order to deal with such cases, an exposure correction function is provided that allows the exposure value determined by the camera to be manually corrected.

[Problems to be Solved by the Invention] However, it is troublesome to operate the exposure compensation every time you take a picture, and if you forget to operate the exposure compensation or prioritize the photo opportunity and change the exposure compensation If this is omitted, there is a problem in that the finish intended by the photographer cannot be obtained. Therefore, it may be possible to have the camera learn past exposure correction trends and automatically perform exposure correction based on the learning results. However, if the exposure compensation value is learned each time an exposure compensation operation is performed, a problem arises in that a value other than the final exposure compensation value is learned. In order to solve this problem, it may be possible to provide an operation member to memorize the final exposure compensation value, but this would require an additional operation member, which would result in an increase in the level from 1 to 1, and the operation would also be cumbersome. A problem arises.

The present invention has been made in view of these points, and its purpose is to provide a camera with a learning function that can automatically perform exposure compensation based on past exposure compensation trends. To enable a camera to automatically learn the final exposure compensation value set by a user.

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the camera having a learning function according to the present invention, as shown in FIG. an exposure calculation means 2 for calculating an exposure value E based on the photometric value BV; and an exposure compensation value B.
exposure compensation value setting means 3 for setting the exposure compensation value BV4, exposure compensation value storage means 4 for storing the exposure compensation value BV4 set by the exposure compensation value setting means 3 at the end of exposure, and the exposure compensation value set by the exposure compensation value setting means 3. It is characterized by having an exposure correction means 5 which corrects the exposure value EV based on the exposure correction value used for the past exposure stored in the exposure correction value storage means 4 when there is no setting of BV4. It is.

Note that, when the exposure correction value BV4 is set by the exposure correction value setting means 3, the exposure correction means 5 is preferably a means for correcting the exposure value E2 based on the set exposure correction value BV4.

However, FIG. 1 is an explanatory diagram showing the present invention in functional blocks, and in the embodiments described later, all or part of means 1 to 5 are realized by a microcomputer program. The photometry means 1 uses #20 to #45, the exposure calculation means 2 uses #165, and the exposure compensation value setting means 3 uses #11o to #165.
In #135, the exposure compensation value storage means 4 stores #], 85. #]
, 95, the exposure compensation means 5 #50 to #60 (and #1
35) respectively.

[Effect] Hereinafter, the present invention will be explained in detail with reference to FIG.

A photometer 1 measures the light of the object field to obtain a photometer value BV. The exposure calculation means 2 calculates the exposure value EV based on the photometry value BV obtained by the photometry means 1. Therefore, the photographer does not need to determine the exposure value EV, and the camera automatically determines the exposure value EV.

If the photographer wants to slightly overexpose or underexpose the exposure value EV determined by the camera, depending on his or her own personality, use the exposure compensation value setting means 3 to set the exposure compensation value BV4, The exposure value EV is manually corrected by the exposure correction means 5. That is, based on the photometric value BV obtained by the photometry means 1, the exposure calculation means 2 determines an appropriate exposure value EV, and the photographer manually sets the exposure value EV using the exposure compensation value setting means 3 as necessary. This is corrected by This exposure compensation value BV4 is not always learned, but only when exposure control is actually performed, only the exposure compensation value BV4 used for that exposure is stored in the exposure compensation value storage means 4, and is learned. It is something that will be done. When exposure is repeated multiple times, the exposure compensation value storage means 4 stores a plurality of exposure compensation values BV4 used for past exposures. In the exposure compensation means 5, when the exposure compensation value BV4 is not set by the exposure compensation value setting means 3,
Based on the plurality of exposure compensation values BV4 stored in the exposure compensation value storage means 4, the exposure compensation value △ is determined according to the personality of the photographer.
To predict BVc and automatically correct exposure value EV. The algorithm for predicting the exposure correction value ΔBVc is not particularly limited, but for example, the average value of the most recent N values among the past exposure correction values BV4, or the intermediate value (the average value of the maximum value and the minimum value), Alternatively, an algorithm that uses the mode value (the most frequently used value) as the predicted value is relatively simple and practical. If the personality of the photographer does not change over time, the exposure correction value ΔBVc predicted by the exposure correction means 5 will converge to the exposure correction value desired by the photographer. Therefore, as you learn more about the camera, it will automatically adjust the exposure compensation according to the photographer's personality, so the camera's automatic exposure determination function will become familiar with the photographer's personality, and there will be no need for exposure compensation. There are many cases where this happens.

[Embodiment] FIG. 2 shows a circuit configuration of a camera as an embodiment of the present invention. In the figure, μC is a microcomputer (hereinafter referred to as "microcomputer"), which performs exposure calculations, exposure control, and sequence control of the entire camera. Microcomputer μC
is connected to various peripheral circuits and can exchange information with these peripheral circuits.

The LMC is a photometry circuit that performs TTL photometry, and its photometry range is divided into two areas: the center SP of the shooting screen and the entire screen AM excluding the center of the shooting screen, as shown in Figure 3. The area ratio of the two regions is set to 1:8. The photometry circuit LMC has a sub-I~photometry function that measures the center part SP of the shooting screen to obtain a spot photometry value BVsP, and a peripheral photometry function that measures the entire screen AM excluding the center part of the shooting screen to obtain a peripheral photometry value BVAM. It has a function.

Information on the spot photometric value BVsP and the surrounding photometric value BVAM is converted into digital quantities and then transmitted to the microcomputer μC.

The DSP is a display circuit that receives display data from the microcomputer μC and displays the necessary information in the viewfinder. The display contents will be described later.

DDR is an exposure control circuit, which controls the aperture and shutter as well as film winding based on the aperture value and shutter speed calculated by the microcomputer μC.

The LEC is a lens circuit built into the photographic lens, and transmits lens data unique to the photographic lens to the camera body. The contents of the lens data include, for example, the maximum aperture value A
There are Vo, focal length f, distance data Dv, etc.

ISO is a film sensitivity reading circuit, which reads film sensitivity information recorded in the film cartridge or a semiconductor memory attached to the cartridge and transmits it to the microcomputer μC. This information is used for AE calculation in the microcomputer μC. Note that this circuit ISO may be equipped with a manual operation member (push button, dial, etc.) so that the film sensitivity can be set and changed manually.

Each of the input ports PO to P10 of the microcomputer μC is pulled up to "'High" level by a resistor (not shown), and is connected to the ground level through a separate switch. When any switch is turned on, the corresponding input port becomes 'Loud' level, and the microcomputer μC can determine whether each switch is ON10F or F.Each switch will be explained below.

Sl is a photographing preparation switch that is turned on by pressing down the first stroke of a release button (not shown), and when this switch is turned on, light metering and exposure calculation operations are started.

S AEL is a state switch (A
AE flock switch), and AE flock is performed only when this switch is ON.

SQ is a learning mode switch, which is a normally open switch, and is operated to feed back the current exposure correction value to the exposure value independently determined by the camera at the next exposure.

Srf is a status switch (photometry standard selection switch) for selecting whether the reference value for photometry display is the average photometry value or the spot photometry value, and when this switch is ON, the average photometry value is selected; When it is OFF, the spot photometry value is selected.

S2 is O by pressing down on the second stroke of the release button.
This is the release switch that is turned on, and this switch is turned on.
Then, the exposure control operation is started.

S is an up switch, Sdn is a down switch, and both are normally open switches.
<When it is ON, it becomes an up/down switch for setting the override amount.

ssp is a status switch (spot photometry switch) operated to perform spot photometry; when this switch is ON, the camera is in spot photometry mode, and when it is OFF, it is in automatic photometry mode. In automatic metering mode, the scene of the subject is determined from the reference metering value BVrf, shooting magnification β, peripheral metering value BVAM, and spot metering value BVsP, and the exposure value is automatically set based on past exposure compensation trends for each gene. It is corrected to

Sov is an override switch for manually performing exposure compensation, and when the up/down switches S up and S do are operated while this switch Sov is ONL, the override amount is increased/rerun operated. Note that when this switch Sov is OFF, the up/down switches Sul+ and Sdn can be used to operate other violets up/down, but since they are not related to the present invention, their explanation will be omitted.

SM is the main switch, and this switch sM or ON
When OFF, the camera becomes operational, and when OFF, the camera becomes inoperable.

Among the above switches, when the main switch SM is turned ON or OFF, 'Hi' is output from the pulse generator PG.
A signal that changes from the LO level to the LO level is input to the interrupt input terminal lNTl, and the microcomputer μC
Execute the SMTN'r flow shown in the figure. #] Then,
The state of the input port P9 is detected and it is determined whether the main switch SM is ON or OFF. Main switch SM is O
If it is FF, the microcomputer μC stops. Further, if the main switch SM is ON, the flags, registers, etc. of the microcomputer μC are all reset in step #2, and for example, the exposure correction value BV4, which will be described later, is also reset here. However, E2FROM, which will be described later, is not reset. When the reset process #2 is completed, the microcontroller μC stops.

Among the above switches, when any of the shooting preparation switch s1, AE flock switch S AFL, and learning mode switch SQ is turned on, the output of the AND circuit AN becomes "'H".
``high'' level changes to ``Loud'' level, and this signal is input to the interrupt input terminal INT2, and the microcontroller μC
S] shown in FIG. 5 executes the INT flow. First, the flag AE1 LP indicating the AE block is reset to 1 to 1 (#5). Next, the lens circuit LE
Load lens data specific to the shooting lens from C (#
], O). This lens data includes at least the open aperture value A V o, the focal length r, and the distance data Dv. Then, the imaging magnification β is calculated from the input focal length f and distance scene Dv (#15).

Next, the spot photometric value BVsP and peripheral photometric value BVAM are input from the photometric circuit LMC, and the open aperture value A V o is added to each photometric value (#20.#22).

Then, switch Srf detects whether the standard photometric value is to be a spot photometric value or an average photometric value, and if it is to be a spot photometric value, the spot photometric value BVsP is substituted for the standard photometric value BVrf, and the average photometric value is If so, the average photometric value B V Av-(B V
sp+ 8 B V AM) / Substitute 9 (#2
5 to #35). Next, the difference (B V AM BV 6p) between the peripheral photometric value BVAM and the spot photometric value BVsP is determined and set as the brightness difference ΔBV (#40). Then, the multi-division photometry value BVI is determined from the photographing magnification β, the spot photometry value BVsP, and the peripheral photometry value BVAM using the following formula (#2 45).

BV 1 = kBVsp + (1k) BVAM" In the formula 1, the coefficient k (<1) is a coefficient that weights the spot photometry value BVsP and the peripheral photometry value BVAM, and the size of the main subject estimated from the shooting magnification β. Taking this into consideration, the settings are as follows.

If β≧1/10, it is assumed that the main subject occupies the frame, and center-weighted metering is performed, k=0.5
shall be.

If 1/10>β≧1/40, it is assumed that the main subject is a little smaller than the above, and the ratio of the part included in the center to the part included in the peripheral area is higher, and k=0.6.

If 1/40>β≧1/100, it is assumed that the main subject is smaller and more likely to be included in the center, and k=
It is set to 0.8.

1 / ], if OO>β≧1−/150,
Although the main subject becomes smaller, it does not necessarily fall within the central spot photometry area, and in order to slightly reduce the weighting at the center, k = 0.4.

If 1/150>β, it is assumed that there is a high possibility that landscape photography is being taken, and k=0, 2 is set for average photometry.

Next, the scene of the subject is determined from the reference photometric value BVrf, the shooting magnification β, and the brightness difference BV, and the N exposure compensation values ΔB V c i stored for that scene are not read out (#50). . That is, for one combination of the reference photometric value BVrf, the photographing magnification β, and the brightness difference ΔBV, one scene c (BVrf, β.

△BV) is determined, and each scene c (BVrf
.

N exposure compensation values ΔB for each of β, ΔBV)
Vci (i=1, . . . , N) is stored.

This exposure correction value ΔBVci is stored in an E2PROM built into the microcomputer μC (or an E2PROM built into an IC card attached to the camera), and is not erased even if the main switch SM of the camera is turned off. #
55, the average of the N exposure compensation values ΔB Vci (i=1,...,N) read from the E2PROM is calculated, and this is used as the compensation value ΔB learned for that scene.
Let it be Vc. Then, the correction value △B is added to the photometric value BV1 above.
Vc is added to make the automatic photometry value B■2 (#60). This automatic light metering value BV2 is a light metering value that is predicted to provide an appropriate exposure for that scene, reflecting the learning results for the scene of the subject at that time.

Here, the scene of the subject will be explained. The camera of the present invention learns past exposure compensation trends, predicts the photographer's desired exposure compensation value ΔBVc, and adds this predicted exposure compensation value ΔBVc to the photometric value BVI to determine the appropriate exposure. The exposure correction value ΔBVc varies depending on the scene of the subject. For example, the direction of exposure correction may be reversed between frontlit scenes and backlit scenes.

Therefore, the spot photometric value BVsP and the peripheral photometric value BVAM
The brightness difference ΔBV is used to discriminate between a frontlit scene and a backlit scene. Further, it is thought that the tendency of exposure compensation is different for landscape scenes, portrait scenes, and close-up scenes. Therefore, these scenes are discriminated using the imaging magnification β. Furthermore, between a snowy mountain shooting scene with high brightness = 15 degrees and a night shooting scene with low brightness,
It is thought that the trends in exposure compensation are different. Therefore, the reference photometric value BVr4 is used to distinguish between high-brightness scenes and low-brightness scenes. Note that by dividing the photographic screen into a plurality of regions and combining the subject distance information and subject brightness information obtained for each region, it is also possible to determine a more complex scene of the subject.

Next, it is determined whether the spot photometry switch Ssp is ON or OFF (#65). If the switch SSP is ON, it is spot photometry, so the spot photometry value BVsP is substituted for the final photometry value BV3. If the switch SSP is OFF, it is automatic photometry, so the automatic photometry value BV2 is substituted for the final photometry value BV3. (#70.

#75). Next, it is determined whether a flag AELF indicating AE flow is set (#80).

If the flag AELF is not set, the final photometric value BV3 is substituted for the photometric value BV6 before correction in #85, and if the flag AELF is set, #85 is skipped and the process proceeds to #90.

16 In #90, is the AE flock switch S AEL ON or O?
Determine whether it is FF. If this switch SAEL is ON, it is determined whether or not a flag AELF indicating an AE block is set (#95). Flag AEL
If F is set, proceed to #135.

Also, if flag AELF is not set, #1
The process advances to 00 to set the flag AELF, and in #102, the correction value BV5 is calculated as (BV2-BV6), and the process advances to #135.

At #90, AE flock switch S AEL is OF
If F, the flag AELF indicating the AE block is reset, and it is determined whether the override switch Sov is ON or OFF (#1.05.#110).

If the override switch Sov is ON, it is determined whether the up switch Sup has changed from OFF to ON (#115). If the up switch Sup changes from OFF to ON, the predetermined value BVk (for example, '
/ e EV ) to the correction value BV4, and #13
Proceed to step 5 (#120). Up switch Sup is OFF
If the down switch Sdn has not changed from OFF to ON, it is determined whether the down switch Sdn has changed from OFF to ON (#125). Down switch Sdn is OFF
If it changes from to ON, the predetermined value BVk is subtracted from the correction value BV4, and the process proceeds to #135 (#1:30). #
When the override switch Sov is OFF in #110, or #115. #125 up switch Sup
Alternatively, if the down switch Sdn has not changed from OFF to ON, the process directly proceeds to #135 without changing the correction value BV4. #135 is the obtained correction value BV
4 to the photometric value BV6 before correction, and the photometric value B for control.
■.

Here, the difference between the correction values BV4 and BV5 will be explained. The correction value BV4 is an override amount that is manually set, and the up/down switch Sup is set while the override 1 to switch Sov is ONL.

By operating Sdn, it can be increased or decreased in BVk units. Since this correction value BV4 depends on the individuality and preference of the photographer, it generally varies depending on the photographer and the scene of the subject.

On the other hand, the correction value BV5 is a correction value that depends on the reflectance of the subject, and may vary depending on the photographer, but mainly varies depending on the scene of the subject. This correction value BV5 is set by performing AE measurement in the spot photometry mode, and corresponds to the brightness difference between the spot photometry value BVsP and the automatic photometry value BV2 when performing AE measurement. Automatic photometry value BV2
Since this is a photometric value that has been automatically compensated for by exposure based on scene discrimination, it is desirable that the photometric value is appropriate for any given scene. However, the fact that the photographer selects the spot metering mode and performs AE photography for a certain scene means that the automatic metering value BV2 determined by the camera is not suitable for that scene. Therefore, in such cases, if the photographer wishes, AE
It is necessary to learn the brightness difference between the spotted spot photometric value B V sp and the automatic photometric value BV2 as an exposure correction value for that scene. For example, if you use the automatic metering mode to photograph a person in a backlit scene before learning, the background will be brighter, so the person will often appear in black. In such a case, select the sub/soto metering mode, place the person in the spot metering area, obtain the spot metering value BVsp, and use it for exposure control using AE measurement, so that the person will be properly exposed. It is photographed like this. If the brightness difference between the spot metering value BVsP used for exposure at this time and the automatic metering value BV2 is learned as the correction value BV5 for backlit scenes, the person can be properly exposed even in backlit scenes using automatic metering mode. The possibility of being photographed becomes higher. In addition, when using AE flash in automatic metering mode, the metered value B before correction
Since V6 is equal to the automatic photometry value BV2, the correction value BV
5 becomes 0.

Next, the process proceeds to #140 in FIG. 6, where it is determined whether the learning mode switch SQ has changed from OFF to ON. This switch S. If it changes from OFF to ON, it is determined whether flags L and MP indicating learning mode are set (#145). And flag L
If MF is set, reset it; if it is reset, set it to 0, and proceed to #165 (#1.50.#15
5). Also, the learning mode switch So is turned from OFF to ON.
If it has not changed, proceed to #165 without doing anything.

In #165, a predetermined calculation is performed from the photometric value BV and the film sensitivity SV to obtain the exposure value EV [that is, the shutter speed TV
and aperture value AV), and in #170,
Execute the display subroutine (described later). When the display is finished, it is determined whether the release switch S2 is ON or OFF (#175). If release switch S2 is OFF, input capo-1-P 1. Determine whether O is at the "High" level or the ゛°■-〇〇　 level (#205). If the input capo-1-P10 is at the "'High" level, the shooting preparation switch S1 and the AE flash switch sA day are set. However, since both learning mode switches S0 are OFF, the camera advances to #2°O, erases the display, and stops.If P1.0 is at the 'Loud' level, it is ready for shooting. This means that any one of the switch S1, the AE flow switch SAEL, and the learning mode switch S0 is turned on, and the process returns to #10 in FIG. In #175, if the release switch S2 is ON, the shutter speed TV and aperture value AV determined in #165 above are
Exposure control is performed based on (#180). after that,
It is determined based on the flag LMF whether the learning mote is set (#185).

If the flag LMF is not set, it is assumed that the learning mode has not been set, and the process proceeds to #200.

If the flag LMF is set, the learning mode is set, so this flag LMF is reset to cancel the learning mode (#190). Then, it is determined whether the spot photometry switch ssp is ON or OFF (#19
],). If the switch SSP is OFF, it is assumed that the spot metering mode is not set, and the process proceeds to #195, where learning is performed, and the process proceeds to #20o. If the switch SSP is ON, it is assumed that the spot metering mode is on, and the process proceeds to #192, where the AE
Flok Switch SAE! - determines whether it is ON or OFF. If the switch SAEL is OFF, the process proceeds to #200 and learning is not performed. If the switch S AEL is ON, the above correction value BV5 (-BV2-BV6
) is set as the exposure correction value BV4, and the process proceeds to #195. #]95
Then, the reference photometric value BVrf, the photographing magnification β, and the brightness difference Δ
The scene of the subject is determined from the BV, the N correction values ΔBVci stored for the scene are called, and the contents are updated by one. In other words, for i-2,...,N, by substituting ΔBVci into ΔBVc++-+) in the same order, the oldest input correction value ΔB V
C+ is deleted and the above exposure correction value BV4 is input as the newest correction value ΔBVcN. Then, the process proceeds to #200, the display is erased, and the process is stopped.

Next, the content displayed by the display circuit DSP is shown in FIG. 8(a).
This will be explained by (f). FIG. 8(a) shows the display circuit D
This shows the state when all the segments that can be displayed within the field of view of the finder are displayed by SP. In the figure, 10
shows the shooting screen seen when looking through the viewfinder of a single-lens reflex camera. In order to display on the photographic screen 10, the focus and focus of the finder optical system are
A guest post type transmissive LCD (liquid crystal 3 display board) is placed above the screen. The display within this shooting screen will be explained. ]1 is a mark that is displayed when learning mode is set. Reference numeral 12 denotes a spot photometry area, which is the same as the central part SP of the photographing screen shown in FIG. 13 is a numerical value that represents the deviation from the reference value as an EV value, with the reference value being 0. If the sign of the numerical value is positive, it indicates overexposure, and if it is negative, it indicates either exposure or underexposure. 14 is ('/,)
This is a scale bar provided for each EV. Reference numeral 15 indicates indicators for displaying deviations, and 13 indicators are arranged at ('/2) EV intervals along the scale bar 14, as shown in FIG. 8(b) to (f). Display the indicator of △′″ or
You can individually select whether to display or not display the black triangular "Pam" indicator.Next, 20 is a display section in the finer that is displayed at the bottom of the photographing screen 10, and the control shutter It consists of a speed display section 21, a control aperture value display section 22, and an override display section 23.The override display section 23 displays a 4-square "10" when exposure compensation is being performed. or -'' symbol is displayed, and is not displayed when exposure compensation is not performed.

Hereinafter, various cases will be explained while showing specific display examples. FIG. 8(1)) is a display example in a normal photometry state (only the photographing preparation switch S1 is ON), and since the mode is automatic photometry, the spot photometry area is not displayed. Reference photometric value BVrf (spot photometric value BVsP or average photometric value (BVsp+8B V AM)/9)
is the origin of the scale bar (the point where the numerical value is 0), and the light metering value in automatic metering mode is displayed as the deviation from there with a black triangular indicator. At the bottom of the exterior, the controlled shutter speed and controlled aperture value based on the photometric value in automatic photometry mode are displayed.

The eighth diagram c) is a display example when the spot photometry switch ssp is turned on and the spot photometry mode is selected, and the spot photometry area is displayed in the center of the photographic screen. When the reference photometry value BVrf is set as the origin of the scale bar, the spot photometry value is displayed as a black triangular indicator as a deviation therefrom, and the photometry value in automatic photometry mode is displayed as a white square. It is displayed as a triangle ゛△'' indicator. At this time, the standard photometric value BV+ (the average photometric value is selected, and if the spot photometric value is selected, the black triangle "' indicator will be displayed at the origin of the scale bar. Note that the control shutter speed and control aperture value based on the spot photometry value are displayed at the bottom of the shooting screen.

Figure 8(d) shows an example of the display when the learning mode is set in the spot metering state and the AE flock switch S AEL is turned ON, and a mark indicating the learning mode is displayed at the upper right corner of the shooting screen. ing.

When exposure control is performed in this state, the difference between the photometry value in automatic photometry mode and the spot photometry value is learned and fed back to the next photometry value in automatic photometry mode.

Figure 8(e) shows override (
There is an example of the display when applying exposure compensation), and the reference metering value is B.
When Vrf (average photometry value here) is the origin of the scale bar, the overridden control value (exposure value used for control) is displayed as a deviation from there using a black triangular indicator. The spot metering value before applying the override is displayed by blinking the white triangular 8" indicator.Here, the white triangular ゛△" indicator is blinking. What is important is that this index is not the photometric value in automatic metering mode, but
This is because it indicates a spot photometry value.

It should be noted that at the bottom right of the outside of the photographing screen, a mark l\<゛ is displayed, indicating that override is applied to the minus side.

Figure 8 <f> is a display example when override is applied in automatic metering mode. When the standard photometry value BVrf (spot photometry value or average photometry value) is set as the origin of the scale bar, the deviation from there is shown. , the overridden control value is displayed as a black triangular parameter, and the metering value in automatic metering mode before override is displayed as a white square symbol. Note that in automatic metering mode, when learning mode is set,
AE7 0 switch S A mark indicating the learning mode is displayed regardless of whether AEI- is ON or FF.

In Figure 8 (b) to (f), the shutter speed and aperture value for exposure control are all the same value, but these change depending on the exposure compensation and changes in the brightness of the subject. It goes without saying that you should.

Next, the subroutine (#], 70) shown above is executed in the seventh
It is shown and explained in the figure. When this subroutine is called, the shutter speed TV and aperture value AV are displayed, and BV7 (
-BV-BVrf) is displayed, and the exposure compensation value BV7! Determine whether I is 0 (#
250~#300). If the exposure compensation value BV4 is 0,
Erase the override display of “10” or “°−”,
It is determined whether the spot photometry switch SsP is ON or OFF (#302.#305).

If the spot photometry switch SSP is OFF, the above-mentioned °゛m'° indicator indicates the deviation of the automatic photometry value from the standard photometry value, so use #3] O to erase the △'' indicator. Then, proceed to #335/\.If the spot metering switch SSP is ON in #305, the above-mentioned "mu" index indicates the deviation of the spot metering value from the reference metering value, so it will automatically In order to also display the deviation of the photometric value from the standard photometric value, #315 and BV8
Display the index of °゛Δ°' at the location where (-=BV2-BVrf), and proceed to #335. If the exposure compensation value BV4 is not 0 in #300, an override of '10' (over) or ' (under) is displayed according to the value of the exposure compensation value BV4 (#320).Then, in #32
In Step 5, it is determined whether the spot photometry switch SsP is ON or OFF. Spot photometry switch Ssp is OFF at #325
If it is F, the above-mentioned ゛'△'' indicator indicates the deviation of the automatic light metering value after exposure compensation from the reference metering value, so the automatic metering value before exposure compensation is the deviation from the standard metering value. In order to display the deviation of , proceed to #315 described above.

Also, if the spot metering switch ssp is ON in #325, the above-mentioned "mu" indicator indicates the deviation of the exposure-compensated spot metering value from the reference metering value, so the exposure is compensated. In order to display the deviation of the previous spot photometric value from the reference photometric value, proceed to 0 #330 and display the parameter Δ'' indicator without blinking at the point where BV8 (=BV3-BVrf) becomes.
Proceed to step 5. As is clear from the above explanation, the ``mm'' index indicates the deviation of the photometric value used for final control from the reference photometric value, and the Δ'' index indicates the standard photometric value of the automatic photometric value. The blinking display of the indicator "Pa" indicates the deviation of the spot photometry value before exposure compensation from the reference photometry value.

In #335, it is determined whether learning mode 1 is set or not based on flag LMF. If the flag LMF is 1, the learning mode is set, and in #340 it is determined whether the spot photometry switch SSP is ON or OFF. If the spot metering switch SSP is ON, A is set in #345.
Determine whether E floc switch SAF is L, ON or OFF. AE floc switch S If AEL is ON, #
A mark indicating the learning mode is displayed in step 350, and if the AE floc switch S AEL is OFF, the mark indicating the learning mode is erased in step #355, and each
Proceed to 60. Also, with #340, spot metering switch S
When SP is OFF', AE flow switch 5AEL
Regardless of the state of , the process proceeds to #350 to display a mark indicating the learning mode, and when the flag LMF is not [ ] in #335, the process proceeds to #355 to erase the display of the mark indicating the learning mode. In #360, it is determined whether the spot photometry switch SSP is ON or OFF, and if it is ON, #3
At step 65, the spot photometry area is displayed, and if it is OFF, the display of the photometry area is erased to subbox 1, and the process returns.

Finally, among the variables used in this example, variables related to photometric values are restored below.

BV... Control photometric value BVsP... Spot photometric value BVAM... Surrounding photometric value B V Av"'Average photometric value - (B Vsp 188
VAN)/9ΔBVei...N exposure correction values ΔBVc learned for a certain scene...Average value of the above 1 B V 1. −Multi-segment photometry value−k B V sP+ (
], k) B V AMBV2...Automatic light metering value =
BVl+ΔBVcB V3 ・=Final photometric value (B V
2 or BVsp) BV4...Correction value that depends on the personality of the photographer BV5...Correction value B that depends on the reflectance of the subject
V6...Photometric value before manual exposure compensation BV7...
・Deviation BV8 for displaying black index ゛△''...White index ゛△''
Deviation BVrf for display...Reference photometric value for deviation display (
BVsp or BVAV) BVk...Minimum unit of overtized amount setting ('/1
lEV) [Effects of the Invention] In the present invention, in a camera that has a learning function that automatically performs exposure compensation based on past exposure compensation trends, the exposure is adjusted only when the exposure is actually performed. Since the camera is made to learn only the exposure compensation value used for the exposure compensation value, there is no need to provide a special operation member to store the exposure compensation value, and the operation of that operation member can also be used for the release operation. This has the advantage that the camera can automatically learn the final exposure 2 correction value set by the photographer.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of the present invention, FIG. 2 is a block circuit diagram of a camera as an embodiment of the present invention, FIG. 3 is an explanatory diagram of the photometry area of the same, and FIGS. The diagrams are flowcharts I~ for explaining the operation of the same as above, and Figure 8 (a).
) to (f) are explanatory diagrams of the display in the finder same as above. 1 is a photometry means, 2 is an exposure calculation means, 3 is an exposure compensation value setting means, 4 is an exposure compensation value storage means, and 5 is an exposure compensation means.

Claims (2)

[Claims] (1) A photometry means, an exposure calculation means for calculating an exposure value based on the photometry value obtained by the photometry means, an exposure compensation value setting means for setting an exposure compensation value, and an exposure set by the exposure compensation value setting means. Exposure compensation value storage means for storing the compensation value at the end of exposure, and exposure compensation value used for past exposures stored in the exposure compensation value storage means when no exposure compensation value is set by the exposure compensation value setting means. What is claimed is: 1. A camera having a learning function, comprising: an exposure correction means for correcting an exposure value based on . (2) The exposure compensation means is a means for compensating the exposure value based on the set exposure compensation value when the exposure compensation value is set by the exposure compensation value setting means. A camera with a learning function.