JPH03252642A - Camera provided with learning function - Google Patents

Abstract

PURPOSE:To learn the correction quantity necessary for exposure without the need of manually setting an exposure correcting quantity by learning a difference between a proper exposure value which is based on a spot photometry value which is obtained by performing AE locking by a photographer and an automatic exposure value which is decided by a camera. CONSTITUTION:In the case that an automatic photometry value BV2 is improper, the spot photometry value BVSP is selected, and then, the AE-locking of the spot photometry value BVSP is performed by an AE-locking operating means 6, and then, the exposure is performed at the exposure value EV which is decided by the camera based on the spot photometry value BVSP. In this case, a brightness difference between the spot photometry value BVSP and the automatic photometry value BV2 which is decided by the camera is stored in a correction value storing means 7 as a correction value BV5. Thereafter, a correction value DELTABVC is predicated by a correction value predicating means 8 based on the contents stored in the correction value storing means 7. By adding the correction value to a multi-divided photometry value BV1 by a photometry value correcting means 3, the following automatic photometry value BV2 is corrected so as to properly expose. Thus, the correction quantity necessary for the exposure can be learned without the need of manually setting the exposure correcting quantity.

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, cameras have an automatic exposure control function that divides the shooting screen into multiple photometric areas and determines an appropriate exposure value using a predetermined algorithm based on the multiple photometric values obtained for each photometric area. is commercially available. 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.

[Problem 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 jack-chance and operate the exposure compensation. If this is omitted, there is a problem in that the finished look intended by the photographer cannot be obtained. Therefore, it is conceivable to have the camera learn the past exposure correction trends and automatically perform exposure correction based on the learning results. The correction values to be learned are mainly the override amounts set manually, but it is also necessary to learn the AE-locked spot metering values6. Selecting a mote and AE locking means that the automatic exposure value determined by the camera is not appropriate for that scene. Therefore, in such cases, if the photographer wishes, AE
It is considered necessary to learn the brightness difference between the appropriate exposure value based on the locked spot photometry value and the automatic exposure value determined by the camera as the exposure correction value for that scene.

The present invention has been made in view of the above points, and its purpose is to detect the difference between the appropriate exposure value based on the metering value of the camera with the AE locked by the photographer, and the automatic exposure value determined by the camera. The object of the present invention is to provide a camera having a learning function that allows learning.

[Means for Solving the Problems] In order to solve the above problems in the camera having a learning function according to the present invention, as shown in FIG. Spot photometric value BVs
A spot photometer 1 that outputs P, a multi-segment photometer 2 that measures multiple areas of the photographic screen and outputs a multi-segment photometry value BVI, and a multi-segment photometry value obtained by the multi-segment photometer 2. a photometric value correction means 3 for calculating an automatic photometric value BV2 by adding a correction value ΔBVc to BVI; and an automatic photometric value BV
2 or an exposure calculation means 4 for calculating an exposure value EV used for control based on the spot photometry value BVsP, and an exposure value EV
Whether to use the automatic photometry value BV2 for the calculation or to use the spot photometry value B
A selection means 5 for selecting whether to use VsP, an AE lock operation means 6 that is manually operated, and a selection means 5 for selecting whether to use VsP, an AE lock operation means 6 that is operated manually, and a selection means 5 for selecting whether to use VsP, and a selection means 5 for selecting whether to use VsP, and an AE lock operation means 6 for selecting whether to use VsP. and a correction value storage means 7 for storing the brightness difference between the spot photometry value BVsP and the automatic photometry value BV2 as a correction value BV5, and a multi-division photometry value BV by the photometry value correction means 3 based on the stored contents of the correction value storage means 7] The correction value prediction means 8 predicts the correction value ΔBVc to be added to the correction value ΔBVc.

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 8 are realized by a microcomputer program. Spot photometry means 1 is #20. #22,
The multi-division photometry means 2 is set to #45, and the photometry value correction means 3 is set to #6.
0, the exposure calculation means 4 sets it to #165, and the selection means 5 sets it to #6.
5 to #75, and the AE lock operation means 6 is #80 to #10.
0, the correction value storage means 7 reads #102. #191~#19
5, the correction value prediction means 8 uses #50. #55 corresponds to each.

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

The spot photometer 1 measures the light of a small area in the center of the photographic screen and outputs a spot photometry value BVsP.

Further, the multi-segment photometry unit 2 measures light in a plurality of areas of the photographic screen, and outputs a multi-segment photometry value BVI based on the photometry value in each area using a predetermined algorithm. The photometric value correction means 3 adds a correction value ΔBVc to this multi-division photometric value BVI.
is added to obtain the automatic photometry value BV2. The exposure calculation means 4 calculates the automatic light metering value BV2 or the spot light metering value BVsP.
The exposure value EV used for control is calculated based on. Whether to use the automatic light metering value BV2 to calculate the exposure value EV or not
The selection means 5 can select whether to use the photometric value BVsP. Normally, the automatic light metering value BV2 is selected and exposure is performed using the exposure value E2 determined by the camera based on the automatic light metering value BV2. If the automatic photometry value BV2 is inappropriate, the spot photometry value BVsP is selected, the spot photometry value BVsP is AE-locked by the AE lock operation means 6, and the camera is determined based on this spot photometry value BVsP. Exposure is performed using the exposure value EV. At this time, the spot photometry value BVsP and the automatic photometry value B determined by the camera are
The brightness difference with V2 is stored as a correction value BV5 in the correction value storage means 7.
is memorized. Thereafter, the correction value ΔB is calculated by the correction value prediction means 8 based on the stored contents of the correction value storage means 7.
Predict Vc. By adding this correction value to the multi-segment photometry value BVI by the photometry value correction means 3, the subsequent automatic photometry value BV2 is corrected so as to provide proper exposure.

[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 has 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 spot 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. have 6
The information on the photometric values BvsP and the peripheral photometric values BVAM of the chamber 1 is converted into digital quantities and then transmitted to the microcomputer μC.

The DSP has 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.
The microcomputer μC reads the FILNO and sensitivity information recorded in the semiconductor memory etc. installed in the Rone and Patrone.
to communicate. This information is used for AE calculation in the microcomputer μC. Note that this circuit ISO has a manual operation member (
A push button, dial, etc.) may be provided so that the film sensitivity can be set and changed manually.

Each of the input ports PO to PLO of the microcontroller μC is pulled up to the "High" level by a resistor (not shown), and each is connected to the ground level through a separate switch.When any switch is turned on, , the corresponding input port becomes 'Low' level, and the ON10FF of each switch can be determined by the microcomputer μC. 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.

sAεL is a state switch (AE
(Flota switch), and AE lock 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 a release switch that is turned on by pressing down the second slide of the release button, and this switch is turned on when the second slide of the release button is pressed down.
When N is selected, the exposure control operation is started.

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

SSP is a status switch (spot photometry switch) that is operated to perform photometry on the Spora 1. When this switch is ON, the SSP is in the Spora 1 photometry mode, and when it is OFF, it is in the automatic photometry mode. In automatic metering mode, the reference metering value BVrf, the shooting magnification β, and the peripheral metering value BVAM are used.
, Spora I and photometric value BVsp to determine the scene of the subject, and the exposure value is automatically corrected based on the past exposure correction trends for each scene.

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 turned on, the override amount is increased or decreased. Note that when this switch Sov is OFF, the up/down switches Sup and Sdn can be used to operate up/down other quantities, but since they are not related to the present invention, their explanation will be omitted.

S4 is the main switch, and this switch SM is 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, the pulse generator PG outputs “Hi”.
A signal changing from the Hh" level to the 'Lou+" level is input to the interrupt input terminal lNTl, and the microcomputer μC executes the SMTNT flow shown in FIG. #1 detects the state of input port P9 and switches main switch SM
Determine whether it 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 to 1 in step #2, and for example, the exposure correction value BV4, which will be described later, is also reset at this time. Tatashi,
The E2P ROM, which will be described later, is not reset. When the reset I-processing of #2 is completed, the microcomputer μC stops.

When any of the above switches, shooting preparation switch S1, AE lock switch S AEL, and learning mode switch SQ, is turned on, the output of the AND circuit AN goes high.
1+'" level changes to "Lou+" level, this signal is input to the interrupt input terminal INT2, and the microcomputer μC
executes the flow of 5ITNT shown in FIG. first,
Reset the flag AELF indicating AE lock (#5
). Next, lens data specific to the photographing lens is read from the lens circuit LEC (#10). This lens data includes at least the open aperture value AVo, focal length f, and distance data Dv. Then, the input focal pressure @f
and the distance data Dν to calculate the photographing magnification β (#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, the switch Srf detects whether the reference photometric value is a spot photometric value or an average photometric value, and
If the photometric value is set as the standard photometric value BVrf, Spora 1 is added.
If the photometric value BVsP is substituted into the average photometric value, the average photometric value B V AV= (
Substitute BV sp+ 8 BV AM)/9 (#25 to #35). Next, the difference between the peripheral photometric value BVAM and the spora ■/photometric value B V sp (B V AM B
V43P) 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 spora 1-photometry value BVsP, and the peripheral photometry value BVAM using the following equation (#45).

BVI = kBVsp + (1-k) BVAM In the above formula, the coefficient k (< 1) is a coefficient that weights the spot photometry value BVsP and the peripheral photometry value BVAM, and the imaging magnification β
The following settings are made in consideration of the size of the main subject estimated from .

If β≧1/10, it is assumed that the main subject occupies the frame, and k=0.5 is set to perform center-weighted photometry.

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.
．． Set it to 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.

]-/ 100 >β≧1/150, the main subject becomes even smaller, but it does not necessarily mean that the center spot 1 enters the metering area, so in order to make the center weighting a little smaller, It is set to 0.4.

], / i 50 >β, it is assumed that it is likely to be a landscape photograph, and in order to obtain average photometry, I(0
,2.

Next, the reference photometric value BVrf, the photographing magnification β, and the brightness difference Δ
The scene of the subject is determined from the BV, and the N exposure correction values ΔBVci stored for the scene are not read out (#50). In other words, the reference photometric value BVrf and the shooting magnification β
, and one combination of brightness difference ΔBV, one scene c(BVrf, β.

△BV) is determined, and each scene c (BVrf
N exposure compensation values △B for each of β, ΔBV)
Vci (i-1, ., N) is stored. This exposure compensation value △BVci is the E2PR built in the microcontroller μC.
It is stored in the OM (or the E2P ROM built into the IC card installed in the camera), and will not be erased even if the main switch SM of the camera is turned to ○ or F. #5
5, find the average of the N exposure compensation values ΔB Vci (i = 1, . . . , N) read from the E2PROM, and use this as the compensation value ΔBVc learned for that scene.
shall be. Then, a correction value ΔBVc is added to the photometric value BVI above.
is added to obtain 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 for front-lit scenes and back-lit scenes.

Therefore, the spot photometric value BVsP and the peripheral photometric value BVAM
The brightness difference ΔBV is used to distinguish between front-lit scenes and back-lit scenes. 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, it is thought that the tendency of exposure correction is different between a high-brightness snowy mountain shooting scene and a low-brightness night shooting scene. Therefore, the reference photometric value BVr4 is used to discriminate 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 photometry for spot 1, so the spot photometry value E3vsp is assigned to the final photometry value BV3.If the switch ssp is OFF, it is automatic photometry, so the automatic photometry value BV2 is assigned to the final photometry value BV3. Substitute (#70° #75). Next, A.E.
It is determined whether the flag AELF indicating lock 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.

#90 Is the AE lock switch S AEL ON or O?
Determine whether it is FF. If this switch 5AIEL is ON, it is determined whether a flag AELF indicating an AE floater is set (#95). If the flag AELF is set to 1-, the process advances to #]35.

Also, if flag AELF is not set, #1
Proceed to 00, set the flag AELF to Sera 1, find the correction value BV5 by (BV2-BV6) in #102, and proceed to #135.
Proceed to.

At #90, AE lock switch S AEL is OFF
If F, the flag AELF indicating AE lock is reset, and it is determined whether the override switch Sov is ON or OFF (#105.#11.O).

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, '
/8EV) to the correction value BV4 and proceed to #135 (
11, 20). Up switch Sup goes from OFF to ON
If the down switch Sdn or OF has not changed.
It is determined whether the state has changed from F to ON (#125).

If the down switch Sdn changes from OFF to ON, the predetermined value BVk is subtracted from the correction value BV4, and #1
Proceed to step 35 (#130). #110 override 1~
When Suitsuji Sov is OFF or #1.15.
#125 Up switch Sup or down switch S
If dn has not changed from OFF to ON, the process directly proceeds to #135 without changing the correction value BV4.

In #135, the obtained correction value BV4 is converted to the photometric value B before correction.
In addition to V6, the control photometric value B■ is used.

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 override 1 to switch Sov is ONL while the up/down switch Sup is set.

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 differs depending on the photographer and also depending on the subject's genealogy.

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 lock in the spot photometry mode, and corresponds to the brightness difference between the spot photometry value BVsP and the automatic photometry value BV2 when the AE lock is performed. 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 locks the AE 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
Photometric value BVsP and automatic photometric value B to locked Spora 1
It is necessary to learn the luminance difference with V2 as an exposure correction value for that scene. For example, if you use automatic metering mode to take a picture of a person in a backlit scene before learning, the background will be brighter, so the person will often appear too dark. In such a case, select the spot metering mode, place a person in the metering area of Spora 1, obtain the spot metering value B V sp, lock the AE, and use this for exposure control to ensure that the person is properly exposed. The photograph will be taken as follows.

And the spot photometry value BV used for exposure at this time
If the brightness difference between sP and the automatic light metering value BV2 is learned as the correction value BV5 for backlit scenes, there is a possibility that people will be photographed with proper exposure even in backlit scenes in the automatic metering mode thereafter. It gets expensive. Note that when AE lock is performed in automatic metering mode, the uncorrected photometric value BV6 is equal to the automatic photometric value BV2, so the correction value BV5 is 0.
becomes.

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. If the switch SQ changes from OFF to ON, it is determined whether the flag LMF indicating the learning mode is set or not (#145). Then, if the flag LMF is set, reset it, if it has been reset, set it, and proceed to #165 (# ],
50. #1-55). In addition, the learning mode switch SQ
Unless it has changed from OFF to ON, proceed to #165 without doing anything. In #165, a predetermined calculation is performed from the photometric value BV and the film sensitivity S to calculate the exposure value EV (that is, the combination of shutter speed TV and aperture value AV), and in #]70, a display subroutine (described later) is executed. Execute. When the display is finished, the release switch S2 is turned from ON to OFF.
The FF is determined (#175). Release switch S2
If is OFF, the input port PLO determines whether the "HiHh" level is the "Loui" level (#205).

If input port P1o is at “High” level,
Shooting preparation switch s1, AE lock switch S AEL
, learning mode switch SQ are both OFF, and the process proceeds to #200 to erase the display and stop.

If the camera input level is O or 'Lour', it means that one of the shooting preparation switch SL, AE lock switch S AEL, and learning mode I to switch SQ is turned on. Returning to #10 in the figure.If the release switch S2 is ON in #175, the shutter speed T determined in #165 above
Exposure control is performed based on V and aperture value AV (#18
0). Thereafter, it is determined whether the learning mode is set or not based on the flag "LMF"(#185).

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

If the flag LMF is set, the learning mode is set, and the flag LMF is reset to cancel the learning mode (#190). Then, determine whether the spot photometry switch SSP is ON or OFF (#
191). If the switch SSP is OFF, it is assumed that the spot metering mode is not in effect, and the process proceeds to #195, where learning is performed, and the process proceeds to #200. If switch ssp is ON,
Assuming that it is spot metering mode, proceed to #192 and select A.
Determine whether E-lock switch S AEL is ON or OFF. If switch S AEI- is OFF, #200
Go on and do no learning. If switch S AEL is ON, #193 sets the above correction value BV5 (-BV2-B
V6) is set as the exposure correction value BV4, and the process proceeds to #195. #1
95, the scene of the subject is determined from the reference photometric value BVrf, the photographing magnification β, and the brightness difference Δ13V, the N correction values ΔBV c i stored for the scene are called, and the contents are updated by one. . That is, i-2,・
..., N, ΔBVci is ΔBVct+- in the same order
11, the oldest input correction value ΔBVc is deleted, and the above exposure correction value BV4 is input as the newest correction value ΔBV(!N. Then, #2
Proceed to 00, erase the display, and stop.

Next, the content displayed by the display circuit DSP is shown in FIG. 8(a).
This will be explained by (f). Figure 8 (,) 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
Guess I/Pos 1~ type transmissive LCD on the screen
(A liquid crystal display board is arranged. The display on this shooting screen will be explained.) 1 is a mark that is displayed when learning mode is set. 12 is a spot metering area; It is the same as the central part SP of the photographing screen shown in the figure. 13 is a value that represents the deviation from this reference value as an EV value, with the reference value being 0. If the sign of the value is positive, the exposure is overexposed. , and if it is negative, it means that the exposure is underexposed. 14 is ('
/2) It is a scale bar provided for each EV. 15 is an index for displaying the deviation, along the scale bar 14 ('/2)
There are 13 EVs arranged in each EV position, as shown in Fig. 8(b) to (f).
), you can individually select whether to display a white triangular 8" index, a black triangular Pam "' index, or no display. Next, reference numeral 20 denotes an in-finder display section displayed at the bottom of the photographing screen 10, which includes a control shutter speed display section 21, a control aperture position display section 22, and an override display section 23.

In the override display section 23, when exposure compensation is being performed, a symbol '-1-' or 'par-' surrounded by a square is displayed, and when exposure compensation is not being performed, it is not displayed.

Hereinafter, various cases will be explained while showing specific display examples. FIG. 8(b) is a display example in normal photometry mode B (only the photographing preparation switch S1 is ON), and since it is automatic photometry mode, the spot photometry area is not displayed. When the standard photometric value BVr (spot photometric value BVsP or average photometric value (BVsP+8B V AM)/9) is set as the origin of the scale bar (the point where the value is O), the deviation from there is the deviation in automatic photometry mode. The photometric value is displayed as a black triangular index.Furthermore, the controlled shutter speed and controlled aperture value based on the photometric value in automatic photometry mode are displayed at the bottom of the outside of the photographic screen.

FIG. 8(c) shows an unusual table when the spot photometry switch SsP is turned on and the spot photometry mode is selected, and the photometry area for spot 1 is displayed in the center of the photographic screen. When the standard photometry value BVrf is set as the origin of the scale bar, the spot photometry value is displayed as a deviation from it with a black triangular mark, and the photometry value in automatic photometry mode is displayed in white. It is displayed as an open triangle ゛△゛ index.At this time, the average photometry value is selected as the reference photometry value BVrf, and if the spot photometry value is selected, the black triangle ゛△゛The index will be displayed at the origin of the scale bar. In addition, at the bottom of the shooting screen,
The control shutter speed and control aperture value based on the photometric value are displayed on pants 1.

Figure 8(d) shows an example of the display when the learning mode is set in spot metering mode and the AE lock switch S AEL is turned on. 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) is a display example when override (exposure compensation) is applied to spot 1 in the photometry state, and when the reference photometry value BVrf (here, the average photometry value) is set as the origin of the scale bar, As a deviation from this, the overridden control value (exposure value used for control) is displayed as a black triangular indicator, and the spot metering value before overriding or the white triangle ゛′Δ゛°
This is displayed by blinking the indicator. Here, the reason why the white triangle ΔPa indicator is blinking is because only at this time, this indicator indicates the spot photometry value, not the photometry value in the automatic photometry mode.

Note that on the outside bottom right of the shooting screen, a mark is displayed to indicate that override is applied to the minus side.

Figure 8(f) is an example of the display when override is applied in automatic metering mode, and the deviation from the reference metering value BVr4 (spot metering value or average metering value) is set as the origin of the scale bar. , the overridden control value is displayed at the 7-8 mark in the black triangle, and the metered value in automatic metering mode before override is shown at the white triangle "Δ". is displayed. In addition, in automatic metering mode 1~,
When learning mode 1~ is set, AE lock switch 5A
A mark indicating the learning mode is displayed regardless of whether IEL is ON or FF.

In Figure 8 (1) to (f), the shutter speed and aperture value for exposure control are all the same value, or do they change depending on the exposure compensation or changes in the brightness of the subject? Needless to say.

Next, the display subroutine (#170) described above is shown in FIG. 7 and will be explained. When this subroutine is called,
Shutter speed TV and aperture value AV are displayed, and BV7 (-
BV-BVrf) is displayed, and it is determined whether the exposure compensation value BV/l is 0 or not (#25
0 to #300). If the exposure compensation value is BV4 or O,
Clear the 10” or -”’ override display and determine whether the spot photometry switch Ssp is ON or OFF (
#302. #305).

If the spot I~photometering switch ssp is OFF, the index "Pam" mentioned above indicates the deviation of the automatic metering value from the standard metering value, so use #310 to delete the index "Δ". , proceed to #335. If the spot metering switch ssp is ON in #3゜5, the above-mentioned ゛mm'' indicator indicates the deviation of the spot metering value from the reference metering value, so automatic metering is started. In order to also display the deviation of the value from the standard photometric value, BV8 (= BV, 2-BV
rf), and display the “△”′ index at the location where #33
Proceed to step 5. If the exposure compensation value BV4 is not O in #300, an override of °+'' (over) or °'' (under) is displayed according to the value of the exposure compensation value BV4 (#320). Then, in #325, it is determined whether the spot 1 photometry switch SSP is ON or OFF. #325
If the spot metering switch SSP is OFF, the ゛゛゛' index above indicates the deviation of the exposure-compensated automatic metering value from the reference metering value. In order to display the deviation of the photometric value from the reference photometric value, the process proceeds to #315 described above.

Also, if the spot metering switch ssp in #325 is set to ○N, the index of ゛゛゛' indicates the deviation of the exposure-compensated spot 1 metering value from the reference metering value. , to display the deviation of the spot metering value before exposure compensation from the standard metering value, proceed to #330 and set BV.
8 (= BV3 - BVrf) is displayed with a blinking '△' indicator, and the process proceeds to #335.As is clear from the following explanation, the '' MP indicator is the final control. The △" indicator shows the deviation of the automatic light metering value from the standard light metering value. The flashing △" indicator indicates the exposure compensation. Indicates the deviation of the previous spot photometric value from the reference photometric value.

In #335, it is determined whether the learning mode is set or not based on the flag LMF. If the flag LMF is 1, learning mode 1 is set, and #340 is set to spot 1.
~Determine whether the photometry switch Ssp is ON or OFF. If the spot metering switch SSP is ON, #345
to determine whether the AE lock switch 5ALL is ON or OFF. AE float switch S If AEI- is ON, a mark indicating the learning mode is displayed with #35o, and A
E-lock switch S If AEL is OFF, #35
In Step 5, the display of the mark indicating the learning mode is erased, and the process proceeds to #360. Also, when the spot metering switch SSP is OFF in #340, the AE lock switch 5AE
Regardless of the state of L, proceed to #350 and display a mark indicating learning mode, and if flag LMF is not 1 in #335, proceed to #355 and erase display of the mark without indicating learning mode 1. . In #360, determine whether the spot photometry switch SSP is ON or OFF. If it is ON, display the spot photometry area in #365, and if it is OFF, erase the display of the spot I/photometering area and return. .

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

BV... Control photometric value B V sp... Spot photometric value BVAM... Surrounding photometric value 1 2 BVAV Average photometric value - (B V sp+ 8 B
V AM)/9ΔBVci N exposure compensation values ΔBVc learned for a certain scene...Average value B V 1 of the same as above, multi-segment photometry value −k B V sp+
(], −k) B V AMBV2 Automatic photometry value =
BVl+ΔBVcBV3 ・Final photometric value (BV2 or B
VS), ) BV4 ・Correction value BV5 that depends on the personality of the photographer ・Correction value BV6 that depends on the reflectance of the subject
・Photometric value before manual exposure correction [Effect of the invention] In the camera having the learning function according to the present invention, when the photographer has AE-locked the spot photometric value, the appropriate exposure value based on the spot photometric value By learning the difference between the automatic exposure value determined by the camera and the automatic exposure value determined by the camera, the subsequent automatic exposure value is brought closer to the appropriate exposure value, and the necessary exposure compensation can be made without having to manually set the exposure compensation amount. It has the effect of being able to learn quantities.

[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 figures are flowcharts 1 to 8 (,
) to (f) are explanatory diagrams of the display in the finder same as above. 1 is a spot photometry means, 2 is a multi-segment photometry means, 3 is a photometry value correction means, 4 is an exposure calculation means, 5 is a selection means, and 6 is A
E-lock operation means, 7 is correction value storage means, and 8 is correction value prediction means.

Claims (1)

[Claims] (1) A spot photometer that measures a small area in the center of the shooting screen and outputs a spot photometry value, and a multi-segment photometer that measures multiple areas of the shooting screen and outputs a multi-segment photometry value; A photometric value correction means that calculates an automatic photometric value by adding a correction value to the multi-segment photometric value obtained by the multi-segment photometric value, and an exposure that calculates an exposure value used for control based on the automatic photometric value or the spot photometric value. a calculation means, a selection means for selecting whether to use the automatic photometry value or the spot photometry value for calculating the exposure value, an AE lock operation means operated manually, and a selection means for selecting whether to use the automatic photometry value or the spot photometry value for calculating the exposure value; a correction value storage means for storing the brightness difference between the spot photometry value and the automatic photometry value in accordance with the operation of the AE lock operation means; 1. A camera having a learning function, comprising: correction value prediction means for predicting a correction value to be added to the correction value.