JP2969740B2 - Camera with learning function - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a camera having a learning function, and is put into practical use as a camera having an automatic exposure compensation function.

2. Description of the Related Art Conventionally, cameras having an automatic exposure control function for measuring a photo-taking screen in various ways and determining an appropriate exposure value by a predetermined algorithm based on the photometric value are commercially available. However, some photographers do not provide exposure slightly over or slightly under the exposure value determined by the camera. In order to cope with such a case, an exposure correction function is provided that enables the exposure value determined by the camera to be corrected by manual operation.

[Problems to be Solved by the Invention] However, it is troublesome to perform an exposure correction operation every time shooting is performed. If it is omitted, there is a problem that the finish feeling intended by the photographer cannot be obtained.

The present invention has been made in view of such a point,
It is an object of the present invention to provide a camera having a learning function capable of automatically performing exposure correction based on a past tendency of exposure correction.

[Means for Solving the Problems] In a camera having a learning function according to the present invention, in order to solve the above-described problems, an exposure calculating means for calculating an exposure value, and correcting the exposure value by a manual operation. First correcting means, means for determining a subject scene, second correcting means for correcting an exposure value based on past exposure correction according to the determined subject scene, and the first and second corrections Control means for controlling the operation based on the exposure value based on the correction by any of the means.

It should be noted that when there is exposure correction by the first exposure correction means 3, the first exposure correction means 3 performs the first exposure correction more
It is preferable that the exposure correction by the exposure correction means 3 be given priority.

However, FIG. 1 is an explanatory diagram showing the present invention in a functionally-blocked manner. In the embodiments described later, all or a part of the units 1 to 4 is realized by a program of a microcomputer. The photometry means 1 is in # 20 to # 45, the exposure calculation means 2 is in # 165, and the first exposure correction means 3 is in # 110 to # 135.
The second exposure correction means corresponds to # 50 to # 60 and # 185 to # 195.

[Operation] Next, the operation of the above configuration will be described. The exposure calculation means calculates the exposure value EV. Therefore, the photographer can
There is no need to determine the EV, and the camera automatically determines the exposure value EV. If the photographer wants to expose slightly more or less than the exposure value EV determined by the camera according to his / her personality, the exposure value EV is manually corrected using the first exposure correction means 3. I do. That is, based on the photometric value BV obtained by the photometric means 1, the camera determines an appropriate exposure value EV by the exposure calculating means 2, and the photographer sets the exposure value EV by the first exposure correcting means 3 as necessary. It is a manual correction. Further, even when the first exposure correction unit 3 does not perform the exposure correction, the second exposure correction unit 4 automatically corrects the exposure value EV based on the past exposure correction amount.
Therefore, if the personality of the photographer does not change over time,
Since the exposure compensation desired by the photographer is automatically performed by the second exposure compensating means 4, the automatic exposure determining function of the camera is adapted to the personality of the photographer, and the first exposure compensating means 3 In many cases, exposure correction due to is unnecessary. In the case where the photographer's personality changes or in a special shooting situation, it is desirable to leave room for manual exposure correction. Therefore, when the exposure correction by the first exposure correction unit 3 is performed, Has priority on manual exposure compensation by the first exposure compensation means 3 over automatic exposure compensation by the second exposure compensation means 3.

Embodiment FIG. 2 shows a circuit configuration of a camera as one embodiment of the present invention. In the figure, μC denotes a microcomputer (hereinafter referred to as “microcomputer”), which performs exposure calculation and exposure control, and sequence control of the entire camera. Microcomputer μ
C is connected to various peripheral circuits, and can exchange information with these peripheral circuits.

LMC is a photometric circuit that performs TTL photometry, and its photometric range is divided into two areas, a central part SP of the photographing screen and an entire screen AM excluding the central part of the photographing screen, as shown in FIG. The area ratio of the two regions is set to 1: 8. Light measuring circuit LMC, the peripheral photometry to seek and spot metering function of finding a spot photometric value BV _SP and photometry of the central part SP of the shooting screen, the peripheral photometric value BV _AM and photometry of the entire screen AM except for the central part of the shooting screen Has a function. The information of the spot photometric value BV _SP and the peripheral photometric value BV _AM is converted into a digital quantity and then transmitted to the microcomputer μC.

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

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

The LEC is a lens circuit built in the taking lens, and transmits lens data unique to the taking lens to the camera body. As the contents of the lens data, for example, the open aperture value AV
₀ , focal length f, distance data Dv, and the like.

ISO is a film sensitivity reading circuit which reads film sensitivity information recorded in a film cartridge or a semiconductor memory mounted on the cartridge, and transmits the information to the microcomputer μC. This information is used for the AE calculation in the microcomputer μC. The circuit ISO may be provided 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 P0 to P10 of the microcomputer μC is pulled up to “High” level by a resistor (not shown), and is connected to the ground level via another switch. When one of the switches is turned on, the corresponding input port goes to the “Low” level, and the ON / OFF of each switch can be determined by the microcomputer μC. Hereinafter, each switch will be described.

S1 is a shooting preparation switch which is turned on when a first stroke of a release button (not shown) is pressed down. When this switch is turned on, each operation of photometry and exposure calculation is started.

S _AEL is a status switch (AE lock switch) for performing AE lock, and AE lock is performed only when this switch is ON.

_SQ is a learning mode switch, which is a normally open switch, which is operated so that the camera can feed back the exposure correction value at that time to the exposure value determined independently by the camera at the next exposure.

Srf is a status switch (photometric reference selection switch) for selecting whether the reference value of the photometric display is an average photometric value or a spot photometric value. When this switch is ON, the average photometric value is selected. When OFF, the spot metering value is selected.

S2 turns on when the second stroke of the release button is pressed down
When the switch is turned on, an exposure control operation is started.

Sup is an up switch, Sdn is a down switch,
Both are normally open switches, and serve as an up / down switch for setting an override amount when a switch Sov described later is ON.

S _SP is a status switch (spot metering switch) operated to perform spot metering.
When set to ON, the spot metering mode is set; when set to OFF, the mode switches to automatic metering mode. In automatic metering mode, the reference metering value
BVrf, magnification β, peripheral photometric value BV _AM , spot photometric value
The scene of the subject is determined from the BV _SP, and the exposure value is automatically corrected based on the past tendency of exposure correction for each scene.

Sov is an override switch for manually Dae-ho correction, up while ON the switch S _ov /
When the down switches Sup and Sdn are operated, the override amount is up / down operated. This switch Sov
Is OFF, the up / down switches Sup, Sdn
Can be used to up / down other amounts, but is not relevant to the present invention, and its description is omitted.

_SM is a main switch. When the switch _SM is ON, the camera can operate, and when OFF, the camera cannot operate.

Of the above switch, the main switch S _M is either or OFF is turned ON, the signal changes to "Low" level from "High" level from the pulse generator PG is inputted to the interrupt input terminal INT1, the microcomputer μC Executes the SMINT flow shown in FIG. In # 1, the state of the input port P9 is detected, and it is determined whether the main switch _SM is ON or OFF. If the main switch S _M is OFF, the microcomputer μC stops. Also,
If the main switch S _M is ON, the flag of the microcomputer μC in # 2, registers, etc. are all reset, for example, is reset here also exposure correction value BV4 below. However, the E ² PROM described later is not reset. When the reset process of # 2 is completed, the microcomputer μC stops.

Of the above switches, one of the shooting preparation switch S1, the AE lock switch S _AEL and the learning mode switch S _Q is turned on.
The output of the AND circuit AN changes from “High” level to “L”.
ow "level, this signal is input to the interrupt input terminal INT2, and the microcomputer μC executes the flow of SINT shown in Fig. 5. First, the flag AELF indicating AE lock is reset (# 5). Next, lens data specific to the photographing lens is read from the lens circuit LEC (# 10), and includes at least the open aperture value AVo, the focal length f,
Distance data Dv is included. Then, the input focal length f
The photographing magnification β is calculated from the distance data Dv (# 15).
Next, the spot metering value BV _SP and the peripheral metering value BV _AM are input from the metering circuit LMC, and the aperture value AV ₀ is assigned to each metering value.
(# 20, # 22). Then, whether the reference photometric value and the average photometric value or a spot metering value detected by the switch Srf, as long as the spot photometric value to the reference photometric value BVrf substituting the spot metering value BV _SP, average photometric value If the average photometry value BV _AV = (BV _SP
+ 8BV _AM ) / 9 is substituted (# 25 to # 35). Next, a difference (BV _AM −BV _SP ) between the peripheral photometric value BV _AM and the spot photometric value BV _SP is obtained, and is set as a luminance difference ΔBV (# 40). Then, from the photographing magnification β, the spot photometric value BV _SP and the peripheral photometric value BV _AM , a multi-division photometric value BV1 is obtained by the following equation (# 45).

BV1 = kBV _SP (1-k) BV _{AM In the} above equation, the coefficient k (<1) is the spot photometric value BV _SP
And the peripheral photometric value BV _AM.
Is set in consideration of the size of the main subject estimated from the following.

If β ≧ 1/10, it is considered that the main subject occupies the entire screen, and k = 0.5 in order to perform center-weighted photometry.

If 1/10> β ≧ 1/40, it is assumed that the main subject is slightly smaller than the above and the ratio of the portion included in the center to the portion included in the peripheral region is larger, and k = 0.6.

If 1/40> β ≧ 1/100, it is considered that the main subject is smaller and the ratio included in the center is larger, and k = 0.8
And

If 1/100> β ≧ 1/150, the main subject becomes even smaller, but it does not always enter the central spot metering area, and k = 0.
And 4.

If 1/150> β, it is considered that the possibility of landscape shooting is high, and k is set to 0.2 in order to perform average photometry.

Next, the reference photometric value BVrf, the photographing magnification β, and the luminance difference ΔBV
, The N scenes and the exposure correction value ΔBVci stored for the scene are read out (# 5).
0). That is, for one combination of the reference photometric value BVrf, the imaging magnification β, and the luminance difference ΔBV, one scene c
(BVrf, β, ΔBV) is determined, and each scene c
N exposure correction values ΔBVci (i = 1,..., N) are stored for (BVrf, β, ΔBV). This exposure correction value ΔBVci is stored in the E ² PROM incorporated in the microcomputer [mu] C (or E ² PROM incorporated in the IC card that is attached to the camera), erased OFF the main switch S _M of the camera Not done. In # 55, an average of N exposure correction values ΔBVci (i = 1,..., N) read from the E ² PROM is obtained, and this is set as a correction value ΔBVc learned for the scene.
Then, the correction value ΔBVc is added to the photometric value BV1 to obtain an automatic photometric value BV2 (# 60). The automatic photometric value BV2 is a photometric value that reflects the learning result of the scene of the subject at that time and is predicted to give an appropriate exposure for that scene.

Here, the scene of the subject will be described. The camera of the present invention learns the past tendency of exposure correction, predicts the exposure correction value ΔBVc desired by the photographer, adds the predicted exposure correction value ΔBVc to the photometric value BV1, and performs appropriate correction. Although the photometric value BV2 automatically corrected to be given is obtained, the exposure correction value ΔBVc differs depending on the scene of the subject. For example, it is conceivable that the direction of exposure correction is reversed between a forward light scene and a backlight scene. Therefore, a forward light scene and a back light scene are discriminated using the brightness difference ΔBV between the spot photometric value BV _SP and the peripheral photometric value BV _AM . In addition, it is considered that the tendency of the exposure correction is different in a landscape scene, a person scene, and a close-up scene. Therefore, these scenes are determined using the photographing magnification β. Further, it is considered that the exposure correction tendency is different between a high-brightness snowy mountain shooting scene and a low-brightness nighttime shooting scene. Therefore, the reference metering value BV
A high-luminance scene and a low-luminance scene are distinguished using rf. Note that a more complicated scene of a subject can be determined by dividing the shooting screen into a plurality of regions and combining the subject distance information and the subject luminance information obtained for each region.

Next, it is determined whether the spot metering switch _SSP is ON or OFF (# 65). Since the switch S _SP is a spot metering if it is ON, the final photometric value BV3 substituting the spot photometric value BV _SP, because the switch S _SP is an automatic photometric if OFF, automatic photometric value to the final photometric value BV3 Substitute BV2 (# 70, # 7
Five). Next, it is determined whether or not the flag AELF indicating the AE lock is set (# 80). If the flag AELF is not set, the final metering value BV3 is substituted into the metering value BV6 before correction in # 85, and if the flag AELF is set, # 8
Skip 5 and go to # 90 respectively. In # 90, AE
_Judge whether the lock switch A _AEL is ON or OFF. If the switch S _AEL is ON, it is determined whether or not a flag AELF indicating AE lock is set (# 95). Flag AE
If the LF has been set, go to # 135. Also, flag A
If ELF is not set, go to # 100 and flag AE
LF is set, the correction value BV5 is obtained by (BV2−BV6) in # 102, and the process proceeds to # 135.

If the AE lock switch S _AEL is OFF at # 90, the flag AELF indicating the AE lock is reset, and it is determined whether the override switch Sov is ON or OFF (# 105, # 11).
0). 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 has changed from OFF to ON, a predetermined value BVk (for example, 1/8 EV) is added to the correction value BV4, and the process proceeds to # 135 (# 120). Up switch Sup is O
Unless it changes from FF to ON, down switch Sdn
It is determined whether or not has changed from OFF to ON (# 125). If the down switch Sdn has changed from OFF to ON, the predetermined value BVk is subtracted from the correction value BV4, and the process proceeds to # 135 (# 13).
0). When the override switch Sov is OFF at # 110,
Alternatively, when the up switch Sup or the down switch Sdn has not changed from OFF to ON in # 115 and # 125, the process directly proceeds to # 135 without changing the correction value BV4. # 135
Then, add the obtained correction value BV4 to the photometry value BV6 before correction,
The photometric value for control is BV.

Here, the difference between the correction values BV4 and BV5 will be described. The correction value BV4 is a manually set override amount,
By operating the up / down switches Sup and Sdn while turning on the override switch Sov, it can be increased or decreased in BVk units. Since the correction value BV4 depends on the personality and preference of the photographer, it generally differs depending on the photographer and also depending on the scene of the subject. On the other hand, the correction value BV5
Is a correction value depending on the reflectance of the subject, and may vary depending on the photographer, but mainly depends on the scene of the subject. This correction value BV5 is AE in spot metering mode.
This is set by locking, and corresponds to the luminance difference between the spot metering value BV _SP and the automatic metering value BV2 when the AE lock is performed. Since the automatic photometric value BV2 is a photometric value whose exposure has been automatically corrected by scene discrimination, it is desired that the photometric value is appropriate for an arbitrary scene. However, for a scene, the photographer selects the spot metering mode
AE lock means that the automatic photometry value BV2 determined by the camera is not suitable for the scene. Therefore, in such a case, if the photographer desires, it is necessary to learn the brightness difference between the AE-locked spot metering value BV _SP and the automatic metering value BV2 as an exposure correction value for the scene. is there. For example, when a person is photographed using an automatic photometry mode before learning in a backlight scene, the person is often crushed in black because the background is brighter. In such a case, select the spot metering mode, enter a person in the spot metering area, and
If the BV _SP is obtained, and this is used for exposure control after AE lock, the person is photographed so that it has the proper exposure. And
If the brightness difference between the spot metering value BV _SP and the automatic metering value BV2 used for the exposure at this time is learned as the correction value BV5 for the backlighting scene, then in the automatic metering mode, the person will be properly exposed even in the backlighting scene. Is more likely to be taken. When the AE lock is performed in the automatic photometry mode, the photometry value BV6 before correction becomes equal to the automatic photometry value BV2, and thus the correction value BV5 becomes zero.

Next, proceeding to # 140 in FIG. 6, the learning mode switch S
_It is determined whether _Q has changed from OFF to ON. If this switch S _Q has changed to ON from OFF, it is determined whether the flag LMF showing a learning mode is set (# 145). If the flag LMF is set, the flag LMF is reset. If the flag LMF is reset, the flag LMF is set, and the process proceeds to # 165 (# 150, # 155). In addition, the learning mode switch S _Q is unless the changes to nO from OFF, nothing proceed to # 165 without. In # 165, photometric value BV, film sensitivity
Exposure value EV (that is, a combination of shutter speed TV and aperture value AV) is calculated by performing a predetermined calculation from SV, and in # 170, a display subroutine (described later) is executed. When the display is completed, it is determined whether the release switch S2 is ON or OFF (# 175). If the release switch S2 is OFF, it is determined whether the input port P10 is at a "High" level or a "Low" level (# 205). If the input port P10 is at “High” level,
Photographing preparation switch S1, AE lock switch S _AEL, none of the learning mode switch S _Q is that the OFF, proceed to # 200, and stopped to erase the display. Input port P10 is “L”
If ow "level, photographing preparation switch S1, AE locking switch S _AEL, it means that either the learning mode switch S _Q is ON, the flow returns to # 10 of FIG. 5. # 175
, If the release switch S2 is ON,
Exposure control is performed based on the shutter speed TV and the aperture value AV obtained in 165 (# 180). Thereafter, it is determined whether or not the learning mode is set by the flag LMF (# 185). If the flag LMF is not set, it is determined that the learning mode is not set, and the process proceeds to # 200. If the flag LMF is set, the learning mode has been set, so the flag LMF is reset and the learning mode is released (# 190). And spot metering switch S
_It is determined whether the _SP is ON or OFF (# 191). Switch S _SP is OFF
Then, it is not the spot metering mode, and # 195
To learn and go to # 200. If the switch _SSP is ON, it is determined that the mode is the spot metering mode, and the process advances to # 192 to determine whether the AE lock switch S _AEL is ON or OFF. If the switch S _AEL is OFF, the process proceeds to # 200 and learning is not performed. If the switch S _AEL is ON, the above-described correction value B is set at # 193.
V5 (= BV2-BV6) is set as the exposure correction value BV4, and the process proceeds to # 195.
In # 195, the scene of the subject is determined from the reference photometric value BVrf, the photographing magnification β, and the luminance difference ΔBV, N correction values ΔBVci stored for the scene are called, and the content is updated by one. That, i = 2, ..., N for, by substituting ΔBVci the same order ΔBVc _(i-1), erases the correction value DerutaBVc ₁ which is oldest input newest corrected exposure correction value BV4 above Enter as value ΔBVc _N. Then, the process proceeds to # 200, where the display is erased and stopped.

Next, FIG. 8 (a) shows the contents of the display by the display circuit DSP.
This will be described with reference to (f). FIG. 8A shows a display circuit DS.
P shows a state in which all displayable segments are displayed in the field of view of the finder. In the figure, reference numeral 10 denotes a photographing screen that can be seen when looking through the viewfinder of the single-lens camera. In order to display the image on the photographing screen 10, a guest-host type transmissive LCD (liquid crystal display panel) is arranged on the focus screen of the finder optical system. The display in the shooting screen will be described. 11 is a mark displayed when the learning mode is set. Reference numeral 12 denotes a spot metering area, which is the same as the central part SP of the photographing screen shown in FIG. Numeral 13 is a numerical value representing a deviation from this reference value as an EV value, with the reference value being 0. If the sign of the numerical value is plus, it indicates that the exposure is over, and if it is minus, it indicates that the exposure is under. 14 is a scale bar provided for each (1/2) EV. 15 is an index for displaying the deviation, and the scale bar
Thirteen are arranged at (1/2) EV locations along 14
As shown in FIGS. 8B to 8F, it is individually determined whether to display an index with a white triangle “△”, to display an index with a black triangle “▲”, or not to display. You can choose. Next, reference numeral 20 denotes a display unit in the finder displayed at a lower portion of the photographing screen 10, and includes a control shutter speed display unit 21, a control aperture value display unit 22, and an override display unit 23. In the override display section 23, a sign “+” or “−” surrounded by a square is displayed when the exposure correction is being performed, and is blank when the exposure correction is not being performed.

Hereinafter, various cases will be described with reference to specific display examples. FIG. 8B shows a display example in a normal photometry state (only the photographing preparation switch S1 is ON). Since the automatic photometry mode is set, the spot photometry area is not displayed. When the reference photometric value BVrf (spot metering value BV _SP or the average light measurement value _{(BV SP + 8BV AM) /} 9) ( numeric point 0) the scale bar origin was, as a deviation therefrom, in an automatic light measuring mode Is indicated by a black triangle “▲”. In addition, a control shutter speed and a control aperture value based on a photometric value in the automatic photometric mode are displayed below the outside of the shooting screen.

Figure 8 (c) is in the ON spot metering switch S _SP, a display example when selecting a spot metering mode, spot metering area is displayed in the center of the shooting screen. When the reference metering value BVrf is used as the origin of the scale bar,
As deviations therefrom, the spot photometric value is indicated by a black triangle “▲” index, and the photometric value in the automatic photometric mode is indicated by a white triangle “Δ” index. At this time, the average photometric value is selected as the reference photometric value BVrf. If the spot photometric value is selected, the black triangle “▲” is displayed at the origin of the scale bar. . Note that a control shutter speed and a control aperture value based on the spot metering value are displayed at the lower part of the shooting screen.

FIG. 8D is a display example when the learning mode is set in the spot metering state and the AE lock switch S _AEL is turned on, and a mark indicating the learning mode is displayed at the upper right end of the shooting screen. I have. When exposure control is performed in this state, the difference between the photometry value in the automatic photometry mode and the spot photometry value is learned, and is fed back to the next photometry value in the automatic photometry mode.

FIG. 8E is a display example when an override (exposure correction) is applied in the spot metering state, and the reference metering value is shown.
When BVrf (here, average photometric value) is set as the origin of the scale bar, the deviation from that is the control value that has been overridden (the exposure value used for control) is a black triangle “▲”
In addition, the spot metering value before the override is applied is displayed by blinking a white triangle “△” index. Here, the reason why the white triangle “Δ” is blinking is that only at this time, the index indicates the spot photometry value, not the photometry value in the automatic photometry mode. At the lower right of the outside of the photographing screen, a “−” mark is displayed on the minus side to indicate that the override is being performed.

FIG. 8 (f) is a display example when the override is applied in the automatic metering mode. When the reference metering value BVrf (spot metering value or average metering value) is set as the origin of the scale bar,
As a deviation therefrom, the control value that has been overridden is indicated by a black triangle “▲”, and the photometry value in the automatic metering mode before the override is applied is indicated by a white triangle “△”. It is displayed by the index of. In the automatic metering mode, when the learning mode is set,
A mark indicating the learning mode is displayed irrespective of ON / OFF of the AE lock switch S _AEL .

8 (b) to 8 (f), the shutter speed and the aperture value for the exposure control are all the same value, but these may be changed by the correction of the exposure amount or the change of the luminance of the object scene. Needless to say.

Next, the subroutine (# 170) of the above-mentioned display will be described with reference to FIG. When this subroutine is called,
The shutter speed TV and aperture value AV are displayed, and BV7 (= BV-BVr
f) The index of “▲” is displayed at the point where becomes, and the exposure compensation value BV4
Is determined to be 0 (# 250 to # 300). Exposure compensation value BV
If 4 is 0, the display of "+" or "-" override is erased, and it is determined whether the spot metering switch _SSP is ON or OFF (# 302, # 305). Spot metering switch S _SP
If it is OFF, the above-mentioned "▲" indicates the deviation of the automatic photometric value from the reference photometric value.
Then, the index of “△” is deleted, and the process proceeds to # 335. If the spot metering switch _SSP is ON in # 305, the above-mentioned "▲" indicates the deviation of the spot metering value from the reference metering value. In order to also display the deviation, an index of “△” is displayed at a location where BV8 (= BV2−BVrf) at # 315, and the process proceeds to # 335. If the exposure correction value BV4 is not 0 at # 300, an override of "+" (over) or "-" (under) is displayed according to the value of the exposure correction value BV4 (# 320). And # 325
To determine whether the spot metering switch _SSP is ON or OFF. #
If the spot metering switch _SSP is OFF at 325, the above-mentioned “▲” indicates the deviation of the exposure-corrected automatic metering value from the reference metering value. The process proceeds to step # 315 to display the deviation of the automatic photometric value from the reference photometric value. Also, if the spot metering switch _SSP is ON at # 325, the above-mentioned index of “▲” indicates the deviation of the exposure corrected spot metering value from the reference metering value. In order to display the deviation of the spot metering value from the reference metering value before the reference, the process proceeds to # 330, where the indicator of “点 滅” is displayed while blinking at the point of BV8 (= BV3−BVrf), and then to # 335. move on. As is clear from the above description, the index of “▲” indicates the deviation of the photometric value used for the final control from the reference photometric value,
The indicator of “△” indicates the deviation of the automatic metering value from the reference metering value, and the blinking display of the indicator of “△” indicates the deviation of the spot metering value before exposure correction from the reference metering value. .

In # 335, whether or not the learning mode is set is determined by the flag LMF. If the flag LMF is 1, the learning mode is set, and it is determined at # 340 whether the spot photometry switch _SSP is ON or OFF. Spot metering switch S
_{If SP} is ON, AE lock switch S _AEL is ON or O at # 345
Determine whether it is FF. If the AE lock switch S _AEL is ON,
At step # 350, a mark indicating the learning mode is displayed. If the AE lock switch S _AEL is OFF, the display of the mark indicating the learning mode is deleted at # 335, and the process proceeds to step # 360. When the spot metering switch _SSP is OFF at # 340, A
Regardless of the state of the E lock switch S _AEL , the process proceeds to step # 350 to display a mark indicating the learning mode, and the flag L is set in step # 335.
If the MF is not 1, the process proceeds to step # 355, where the display of the mark indicating the learning mode is deleted. In # 360, it is determined whether the spot metering switch _SSP is ON or OFF. If ON, the spot metering area is displayed in # 365, and if OFF, the display of the spot metering area is deleted and the process returns.

Finally, among the variables used in this embodiment, variables relating to the photometric value are listed below.

BV: Metering value for control BV _SP : Spot metering value BV _AM : Perimeter metering value BV _AV : Average metering value = (BV _SP + 8BV _AM ) / 9 ΔBVci: N exposure correction values learned for a scene ΔBVc ... Same as above Average value BV1 Multi-segment metering value = kBV _SP + (1-k) vB _AM BV2 Automatic metering value = BV1 + ΔBVc BV3 Final metering value (BV2 or BV _SP ) BV4 Correction value depending on individuality of photographer BV5: Correction value that depends on the reflectance of the subject BV6: Metering value before manual exposure correction BV7: Deviation for displaying black index "▲" BV8: Deviation for displaying white index "△" BVrf: For displaying deviation Reference metering value of (BV _SP or BV _AV ) BVk: Minimum unit of override amount setting (1/8 EV) [Effect of the Invention] In the camera having the learning function of the present invention, the subject scene is determined and determined. Exposure compensation is automatically performed based on the past tendency of exposure compensation according to the subject scene In, there is an effect that when the intended finish feeling even photographer without manual intervention exposure compensation every time shooting is obtained increases.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of the present invention, FIG. 2 is a block circuit diagram of a camera as one embodiment of the present invention, FIG. FIG. 8 is a flowchart for explaining the operation of the above, and FIG.
(F) to (f) are explanatory views of the display in the finder. Reference numeral 1 denotes a photometer, 2 denotes an exposure calculator, 3 denotes a first exposure corrector, and 4 denotes a second exposure corrector.

Continuing from the front page (72) Kotaro Hayashi 2-3-13 Azuchicho, Chuo-ku, Osaka-shi, Osaka Prefecture Osaka International Building Minolta Camera Co., Ltd. (72) Inventor Akihiko Fujino 2-chome Azuchicho, Chuo-ku, Osaka-shi, Osaka No.3-13 Osaka Kokusai Building Minolta Camera Co., Ltd. (72) Inventor Hiroshi Otsuka 2-3-13 Azuchicho, Chuo-ku, Osaka City, Osaka Prefecture Osaka Kokusai Building Minolta Camera Co., Ltd. (56) References −84528 (JP, A) Japanese Utility Model 2-58728 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) G03B 7/00-7/28

Claims (4)

(57) [Claims] 1. Exposure calculation means for calculating an exposure value; first correction means for correcting an exposure value by manual operation; means for determining a subject scene; and past exposure correction according to the determined subject scene. Learning means for correcting the exposure value based on the correction value, and control means for controlling the operation based on the exposure value based on the correction by one of the first and second correction means. Camera with functions. 2. A camera having a learning function according to claim 1, wherein a subject scene is determined based on a luminance difference between a spot photometric value and a peripheral photometric value. 3. The camera having a learning function according to claim 1, wherein the subject scene is determined based on a photometric value or a photographing magnification. 4. A camera having a learning function according to claim 1, wherein the past exposure correction is stored at the end of the exposure according to the determined subject scene.