JPH11326980A - Camera system provided with camera-shake correcting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a failure in picking up an image caused by a camera-shake and the blur of a main object, in the case that a camera-shake limit shutter speed becomes low to such a degree that the blur of the main object occurs. SOLUTION: In this camera system, a camera-shake amount is detected by using an angular velocity sensor, etc., for a camera-shake detector 252, the camera-shake limit shutter speed TVHh is calculated on the basis of the detected camera-shake amount and a main object blur limit shutter speed TVHs is calculated with the blurring amount of main object 2 detected by an image surface sensor 180, etc., to calculate an optimum stop value AVS and a shutter speed TVS by using either one of the camera-shake limit shutter speed TVHh or the main object blur limit shutter speed TVHs which is faster, as a blur limit shutter speed TVH. A diaphragm driving device 211 and a shutter unit 130 are driven by using those values. Further, a correcting lens driving device 251 is driven to correct the camera-shake.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to exposure control in a camera system having a camera shake correction function.

[0002]

2. Description of the Related Art In a conventional 35 mm camera having no camera shake correction function, it is generally said that the reciprocal of the focal length of a lens is a limit shutter speed at which camera shake does not occur (shake limit shutter speed). For example, in the case of a standard lens having a focal length f _L = 50 mm, the camera shake limit shutter speed is 1 / f _L = 1/50 sec (in the case of a manually controlled camera, the closest shutter speed is 1/60 sec: A
In the PEX display, it is TV6). Similarly, the focal length f _L
In the case of a telephoto lens of = 500 mm, the camera shake limit shutter speed is 1 / f _L = 1/500 second (TV9).

On the other hand, in a camera having a camera shake correction function that has been put into practical use in recent years, for example, when optically correcting camera shake, the amount and direction of movement of the lens due to camera shake are calculated by an angular velocity sensor or the like, and correction is performed in the opposite direction. 2. Description of the Related Art Moving an optical system cancels the movement of an image on a film surface. Therefore, even if the camera is photographed at a slower shutter speed than a camera without a camera shake correction function, it is possible to prevent failure due to camera shake or the like. In the above specific example, in the case of a standard lens having a focal length f _L = 50 mm, camera shake does not occur even when photographing at a shutter speed slower by two or three steps such as 1/15 second (TV4) or 1/8 second (TV3). Rarely occurs. In the case of a telephoto lens having a focal length f _L = 500 mm, camera shake hardly occurs even when photographing is performed at 1/125 second (TV7).

[0004]

Generally, since a lens having a long focal length has a large open F-number (ie, is dark),
The range of selection of the combination of the aperture value and the shutter speed is narrow, with the subject brightness kept constant. Therefore, if it becomes possible to shoot at a slower shutter speed, the degree of freedom of the combination of the aperture value and the shutter speed is widened, and the camera shake correction function is effective. Also, if the shutter speed can be reduced, a larger aperture value can be selected accordingly, and the depth of focus can be increased. Therefore, in a camera system having a conventional camera shake correction function, when the camera shake correction function is operating, an exposure program is set so as to select the shutter speed to a lower speed side.

However, in the case of a standard lens or a wide-angle lens having a short focal length, if a shutter speed as slow as 1/15 second (TV4) or 1/8 second (TV3) is selected as the camera shake limit shutter speed, the exposure is stopped. Of the main subject (main subject shake) becomes noticeable.

In the case of camera shake detection using an angular velocity sensor, a gyro sensor, or the like, it is possible to detect camera shake due to camera shake or the like, but it is impossible to detect main subject shake due to movement of the main subject. In the case of shake detection using an image sensor (image plane sensor) such as a CCD such as a digital camera or a video camera, it is possible to detect the movement of an image in which the shake of the photographer and the shake of the main subject are combined. However, the two could not be separated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and sets a shake limit shutter speed in consideration of both a camera shake and a main subject shake, and determines the main subject shake. It is an object of the present invention to provide a camera system in which the possibility of photographing failure is reduced.

[0008]

To achieve the above object, a first camera system having a camera shake correction function according to the present invention calculates a camera shake limit shutter speed using focal length information and camera shake correction information of an imaging lens. And an exposure calculation means for correcting the camera shake limit shutter speed using the main subject shake information. According to this configuration, when the camera shake limit shutter speed is reduced by the camera shake correction function,
Since the camera shake limit shutter speed is corrected in consideration of whether or not the main subject shake occurs, it is possible to perform the camera shake correction and prevent the main subject shake from occurring, thereby reducing the possibility of failure in photographing. Further, this camera system can be applied to all types of cameras having a camera shake correction function, and the imaging lens may be a type that is fixed integrally with the camera, or a type in which the imaging lens is replaceable. There may be. Further, the camera shake correction mechanism may be provided on the camera side, or may be provided on the lens side. Further, a camera using a silver halide film or a camera using a solid-state imaging device may be used. The same applies to the following configurations.

A camera system having a second camera shake correction function according to the present invention detects at least the camera shake amount, corrects the camera shake based on the camera shake amount, measures the subject brightness, and outputs brightness information. Photometry means, camera shake limit shutter speed calculation means for calculating a camera shake limit shutter speed that causes camera shake when the speed becomes slower, and a main subject for calculating a main subject shake limit shutter speed which causes a main subject shake when the speed becomes slower Using a shake limit shutter speed calculating means, a shake limit shutter speed selecting means for selecting a higher one of a camera shake limit shutter speed and a main subject shake limit shutter speed as a shake limit shutter speed, and using shake limit shutter speed and luminance information. And an exposure calculating means for calculating an optimum exposure value. According to this configuration, the higher of the camera shake limit shutter speed and the main subject shake limit shutter speed is set as the shake limit shutter speed, so that camera shake correction can be performed and occurrence of main subject shake can be prevented. .

In the camera system having the second camera shake correction function, the camera shake limit shutter speed calculation means includes a focal length detection means for detecting a focal length of the imaging lens, and the camera shake correction information output from the camera shake correction means and the camera shake correction information. The camera shake limit shutter speed is calculated using the detected focal length information, and the main subject shake limit shutter speed calculation means includes main subject shake detection means for detecting the main subject shake amount, and the main subject shake limit calculation means uses the detected shake amount information. The subject shake limit shutter speed may be calculated. According to this configuration, even when the imaging lens is a variable focal length lens such as a zoom lens or when the imaging lens is replaceable, the main subject shake on the image plane according to the focal length of the lens is the same. Detection can be performed under conditions, and a constant shake correction effect can be obtained regardless of the focal length of the imaging lens.

Further, the main subject shake detecting means includes an image plane sensor provided at a position relatively equal to the focal plane of the imaging lens to detect the image shake, and detects the detected image shake information and the camera shake from the camera shake correcting means. The difference from the information may be configured as the main subject shake amount. According to this configuration, since the absolute amount of the main subject shake is obtained, the main subject shake limit shutter speed can be accurately calculated.

Alternatively, the main subject shake detecting means includes an image plane sensor provided at a position relatively equal to the focal plane of the imaging lens to detect image shake, and divides the screen into a plurality of areas by the image plane sensor. Alternatively, the image shake amount may be calculated for each of the divided regions, and the difference between the image shake amount of the region where the main subject exists and the average image shake amount of the other regions may be set as the main subject shake amount. good. According to this configuration, the main subject shake amount can be obtained only by the image plane sensor without using the camera shake information from the camera shake correction unit. In a camera such as a digital camera or a video camera in which camera shake is corrected by image processing using a solid-state image sensor, the image plane sensor and the image sensor can be used in combination, which is particularly effective.

Alternatively, in the camera system having the second camera shake correcting function, the camera shake limit shutter speed calculating means includes a focal length detecting means for detecting a focal length of the imaging lens, and the camera shake correction output from the camera shake correcting means is provided. The camera shake limit shutter speed is calculated using the information and the detected focal length information, and the main subject shake limit shutter speed calculating means is a distance measuring means for measuring the distance to the main subject, and the focus distance information and the main subject An image magnification calculator for calculating an image magnification using the distance information may be included, and the main subject shake limit shutter speed may be selected based on the image magnification. According to this configuration, the main subject shake limit shutter speed is selected from the predicted numerical values in advance according to the image magnification without actually obtaining the main subject shake amount, so that the image plane sensor becomes unnecessary. In particular, it is effective for a camera using a silver halide film without using an imaging device such as a CCD.

The main subject shake limit shutter speed calculating means may be configured to select the main subject shake limit shutter speed based on the image magnification and the focal length of the imaging lens. Alternatively, the main subject shake limit shutter speed calculation means may be configured to select the main subject shake limit shutter speed based on image magnification and luminance information. According to these configurations, it is possible to increase the accuracy of the main subject shake limit shutter speed.

In the camera system having the second camera shake correction function, the exposure calculation means calculates main subject brightness using brightness information from the photometry means, a shake limit shutter speed, A shake limit luminance calculating means for calculating a shake limit luminance using an open aperture value of the imaging lens, and a flash light emission determining means for comparing the main subject luminance and the shake limit luminance to determine flash light emission or non-light emission, A control exposure calculation means for calculating a control aperture value and a control shutter speed used for photographing using the determination result of the flash emission determination means and the main subject luminance may be included. According to this configuration, when the main subject luminance is lower (dark) than the shake limit luminance, the automatic flash emission control can be performed, and it is possible to prevent a photographing failure due to camera shake or main subject shake.

When the main subject luminance is lower than the shake limit luminance and flash emission is possible, the control aperture value is set to the open aperture value of the imaging lens, and the control shutter speed is set using the main subject luminance and the open aperture value. May be calculated, and the flash emission control may be performed using the lower limit value of the control shutter speed as the shake limit shutter speed. If the main subject brightness is lower than the shake limit brightness and flash emission is not possible, the control aperture value is set to the open aperture value of the imaging lens, and the control shutter speed is set to the shake limit shutter speed to perform steady light control. It may be configured as follows. Further, when the main subject luminance is higher than the shake limit luminance and the flash is forcibly fired, the control shutter speed is set to a predetermined shutter speed capable of synchronizing synchronization and higher than the shake limit shutter speed, and the main subject luminance and the shutter speed are set. May be used to calculate the control aperture value, and control the flash emission using the upper limit value of the control aperture value as the minimum aperture value of the imaging lens. According to these configurations, it is possible to arbitrarily select each of the control modes of the forced light emission of the flash, the forced non-light emission, and the automatic light emission according to the photographer's will, and to minimize the influence of camera shake in any of the control modes. It is possible to do.

The exposure calculating means includes a control mode discriminating means. When the camera shake correction priority mode is set, the exposure calculating means sets the camera shake limit shutter speed to the lower limit value of the control shutter speed regardless of the camera shake limit shutter speed. You may comprise. According to this configuration, when the photographer selects the camera shake correction priority mode, the camera shake correction can be prioritized without considering the main subject shake, and the shake of the main subject can be reduced, such as in panning or still life shooting. Can be taken at a lower shutter speed if little consideration is needed.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of a camera system having a camera shake correction function according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a schematic configuration of a camera having a camera shake correction function according to the first embodiment.

At the approximate center of the camera 100, a main mirror 111 and a main mirror 111 which are inclined at about 45 degrees with respect to the optical axis L are provided.
Of the main mirror 111,
A mirror box 110 including an auxiliary mirror 112 inclined at 0 degrees is provided. Mirror box 110
A finder 120 composed of a reticle, a prism, an eyepiece, and the like is provided at an upper part of the finder. Finder 1
A light emitting unit 150 for emitting flash light is provided on the upper part of the light emitting unit 20.

At the bottom of the mirror box 110 (the side opposite to the finder 120), there are provided a focus position detecting device 140, an image plane sensitivity detecting device 160, an AF driving mechanism (not shown), and the like. A shutter unit 130 is provided on the rear surface of the mirror box 110 (the side opposite to the imaging lens 200).
Is provided. In the case of a silver halide photographic camera, a film is loaded on the focal plane 1 of the imaging lens 200. Also,
In the case of a digital camera, an image sensor such as a CCD is provided. The image plane sensitivity detecting device 160 refers to a film sensitivity setting device in the case of a silver halide photographic camera or a reading device such as a film sensitivity display code provided in a film cartridge.

On the optical axis L of the imaging lens 200, a shake correction lens 250 for correcting camera shake and a diaphragm 210 are provided.
Is provided. The shake correction lens 250 is driven by the correction lens driving mechanism 251 in the direction indicated by the arrow Y in the figure and in the X direction perpendicular to the paper surface. An aperture driving device 211, a focal length detection device 212 of the imaging lens 200, and a camera shake detection device 252 such as an angular velocity sensor and a gyro sensor are provided near the imaging lens 200.

In the vicinity of the eyepiece of the finder 120, there are provided a photometric device 170 including a condensing lens and a photoelectric conversion element such as a photodiode, and an image plane sensor 180 such as a CCD. Further, the control device 300 including the CPU and the like is provided between the body and the outer cover constituting the camera 100 and the like. The switches S1 and S2 are switches which are turned on in conjunction with the operation of the shutter release button. The switch S1 is turned on when a finger is put on the shutter release button (so-called half-pressed state), and the switch S2 is turned on when the shutter release button is pressed. Turn on with the button fully pressed.

Next, FIG. 2 shows a block configuration of the exposure control section in the first embodiment. CPU of control device 300
The camera shake limit shutter speed calculation unit 301, the main subject shake limit calculation unit 302, the shake limit shutter speed selection unit 3
03, functions as an exposure calculation unit 304, a camera shake correction unit 305, and a main subject shake detection unit 306. The focal length detection device 212 detects the focal length when the imaging lens 200 attached to the camera 100 is a single focus lens,
When the imaging lens 200 is a zoom lens, the current focal length is detected and input to the camera shake limit shutter speed calculation unit 301 of the control device 300. The camera shake correction unit 305
The correction lens driving device 251 is controlled based on the camera shake amount and the camera shake direction detected by the camera shake detection device 252. Here, it is determined whether or not the camera shake correction function is selected by the photographer, and the determination result is determined. Output to the limit shutter speed calculation unit 301.

The camera shake limit shutter speed calculation unit 301 calculates the camera shake limit shutter speed TVHh as follows. First, a camera shake limit shutter speed TVHo (APEX display) in a camera having no conventional camera shake correction function is obtained from the focal length f _L of the imaging optical system 200 detected by the focal length detection device 212. Next, TVHo
The camera shake limit shutter speed TVHh is determined in consideration of the correction value ΔTVb. TVHo, TVHh, and ΔTVb are represented by the following equations (1) to (3), respectively.

[0025]

(Equation 1)

C1 and C2 are arbitrary coefficients, respectively.
Normally, C1 = 0 and C2 = 1. f (B) is a function of the shake correction amount B calculated using the camera shake amount detected by the camera shake detection device 252 or the focal length of the imaging lens 200, and is, for example, stepwise according to the value of the shake correction amount B. Is an integer that changes to When ΔTVb = 3, the camera shake limit shutter speed TVHh when camera shake correction is performed is set to the camera shake limit shutter speed TVHo when camera shake correction is not performed.
Means three steps later. When the camera shake correction function is not selected, ΔTVb = 0.

The image plane sensor 180 is located at a position relatively equal to the focal plane 1 of the imaging lens 200, and detects an image shake obtained by adding a camera shake and a main subject shake. Therefore, the main subject shake detection unit 306 detects the image shake amount (image shake vector) Vcs and the camera shake amount (camera shake vector) Vc using both the image plane sensor 180 and the camera shake detection device 252, and calculates the image shake vector Vcs from the image shake vector Vcs. The main subject shake amount (main subject shake vector) Vs is obtained by subtracting the camera shake vector Vc. That is, Vs = Vcs-Vc is calculated. Each of the shake amounts Vs, Vc, and Vcs is a moving distance per unit time, and the unit is μm / sec.

Main subject shake limit shutter speed calculator 30
2 is a main subject shake limit shutter speed TV based on the main subject shake amount Vs detected by the main subject shake detection unit 306.
Hs is calculated. First, a ratio Ts = K1 / Vs (second) of a main subject shake amount Vs to a preset allowable limit shake amount K1 (for example, K1 = 50 μm) is obtained. The allowable limit shake amount K1 = 50 μm means that Vs =
If it is 50 μm or less, it means that the main subject shake is not recognized. Therefore, Vs> K1. Next, TVHs is calculated by the following equation (4).

[0029]

(Equation 2)

The shake limit shutter speed selection unit 303 includes a camera shake limit shutter speed TVHh for preventing camera shake.
Is compared with the main subject shake limit shutter speed TVHs for preventing main subject shake, and the faster value is set as the shake limit shutter speed TVH. If the slower (smaller) value of TVHh and TVHs is set as the shake limit shutter speed TVH, either camera shake or main subject shake can be prevented, but the other shake occurs. , Shooting may fail. On the other hand, the faster (larger) of TVHh or TVHs
Is set as the shake limit shutter speed TVH,
It is possible to prevent both camera shake and main subject shake.

When the control mode of the camera is set to the automatic flash mode or the forced flash mode of the flash, the exposure control unit 304 compares the shake limit shutter speed TVH with a preset synchro tuning speed TVX. , The slower (smaller) value is defined as the flash shooting shake limit shutter speed TVH2. Then, the control aperture value AVS and the control shutter speed TVS are determined according to a predetermined program according to the subject luminance measured by the photometric device 170, and the aperture drive device 211 and the shutter unit 130 are controlled.

FIG. 3 shows an example of a program diagram. FIG.
(A) shows a program diagram in the case of a flash automatic light emission mode. In the figure, AV0 represents the open F value of the imaging lens 200, AVmax represents the maximum F value (minimum aperture value) of the imaging lens 200, and TVmax represents the highest shutter speed of the shutter unit 130. In an area on the right side of the shutter speed TVH2, that is, an area where the control exposure value EVT (EV = subject luminance BV + film sensitivity SV) calculated by the image plane sensitivity detection device 160 and the photometry device 170 is larger than the camera shake limit exposure value EVH, Exposure control (steady light control) is performed without emitting flash light. When the control exposure value EVT is smaller than the camera shake limit exposure value EVH, the flash light control is performed while the shutter speed is fixed at TVH2. As the flash light control, the flash emission amount may be controlled by fixing the aperture value AV, or both the aperture value and the flash emission amount may be controlled in consideration of the distance to the main subject 2. .

FIG. 3 (b) shows the flash photographing limit shutter speed according to the magnitude of the main subject shake amount Vs.
H1, TVH2, TVH3 (provided that TVH1 <TVH2
FIG. 9 shows a program diagram in a case where any one of <TVH3 ≦ TVX) is selected.

Since the present invention is intended to prevent a photographing failure due to a camera shake or a main subject shake, when the control mode of the camera is set to the forced off mode of the flash (no flash), the control exposure is performed. Value EVT
When the camera shake limit exposure value EVH or less, the shutter release button may be locked, a warning sound or the like may be generated, and the photographer may be prompted to use the flash.

Next, the operation of the first embodiment will be described. 4 and 5 show a main routine of the imaging operation.
When a main switch (not shown) of the camera 100 is turned on, the control device 300 determines whether the switch S1 is on (step S100). When switch S1 is turned on (YES in step S100), control device 300 determines whether or not the camera shake correction function is on (step S105). If the camera shake correction function is ON (YES in step S105), control device 30
In step S110, information about the camera shake correction such as the focal length of the imaging lens 200 detected by the focal length detection device 212 and the camera shake amount and direction detected by the camera shake detection device 252 is read (step S110).

When the camera shake correction function is not turned on in step S105 and when the camera shake correction information is read in step S110, the control device 300 calculates the distance to the main subject 2 using the focus position detection device 140 and the like. An image pickup lens 200 is controlled by controlling an image pickup lens driving device (not shown).
Is focused (step S115). In parallel with this,
The luminance BV of the main subject 2 is measured using the photometric device 170 (step S120). Further, the control device 300
A combination of the control aperture value AVS and the control shutter speed TVS is determined (AE calculation) using the photometric main subject luminance BV and the film sensitivity SV detected by the image plane luminance detection device 160 (step S125). The details of the AE calculation subroutine will be described later.

Control aperture value AVS and control shutter speed T
When VS is determined, control device 300 determines whether or not switch S2 has been turned on (step S130). When the switch S2 is turned on, the shutter release button has been fully depressed, so that the main mirror 111 and the auxiliary mirror 11 of the mirror box 110 are mechanically or electrically connected by the control device 300 in conjunction with the shutter release button.
2 is retracted (mirror up) to prepare for exposure (step S135). In parallel with the mirror-up operation, the control device 300 controls the diaphragm driving device 211 to control the imaging lens 2.
The aperture 210 of 00 is set to the calculated control aperture value AVS (aperture driving) (step S140).

Further, in the present embodiment, since the camera 100 is provided with a camera shake correction function, the control device 300 controls the correction lens driving mechanism 251 to move the correction lens 250 in a predetermined direction by a predetermined amount, thereby correcting the camera shake. The operation is performed (step S145). When the camera shake correction operation is started, the control device 300 controls the shutter unit 130, opens the shutter, and starts exposure (step S15).
0). It should be noted that a camera shake detection device, a correction lens driving mechanism, and a camera shake correction control circuit may be provided on the lens side in order to enable camera shake correction by mounting the camera on a camera having no camera shake correction function. Therefore, when such a lens is mounted, the camera shake correction operation in step S145 is not performed on the camera 100 side, and the process proceeds to step S150, where the shutter is opened and exposure is started. At the same time, the counting of the shutter open time ΔT is started.

Next, the control device 300 proceeds to step S12.
It is determined whether or not the flash should be fired based on the result of the AE operation in step 5 (step S155). If the flash is to be fired (YES in step S155),
The control device 300 controls the light emitting unit 150 to emit a flash. Further, control device 300 determines whether or not shutter opening time ΔT has reached control shutter speed TVS (step S165). When shutter opening time ΔT reaches control shutter speed TVS (YES in step S165), control device 300 controls shutter unit 130 to close the shutter and terminate exposure (step S165).
170). When the exposure is completed, preparations for the next imaging such as returning of the main mirror 111 and the auxiliary mirror 112 of the mirror box 110, winding of the film, charging of the shutter unit 130 and the like are performed (step S175), and the imaging operation is ended.

Next, A in step S125 in FIG.
FIG. 6 shows the E operation subroutine. The control device 300
On / off information of the camera shake correction function read in steps S105 and S110, information on camera shake correction such as camera shake amount and camera shake direction, focal length information of the imaging lens 200, distance information to the main subject 2 measured in step S115, and the like. Read data used for calculation (step S2
00), the image magnification β is calculated using these data (step S205). The image magnification β is a function of the focal length f _L of the imaging lens 200 and the distance D to the main subject 2 (β = f
(F _L , D)).

Next, the control device 300 proceeds to step S12.
At 0, the photometric data measured using the photometric device 170 is read (step S210), and the luminance data of the subject is calculated using the photometric data (step S215).
Here, when the photometry device 170 performs multi-segment photometry, the main subject luminance BVS and the background luminance BVA at the center of the screen are calculated. Then, the control device 300 calculates the shake limit shutter speed using the calculated luminance data (step S22).
0), it is determined whether the light emitting unit 150 is set to automatic light emission, forced light emission, or non-light emission of the flash, and whether or not the flash needs to be emitted (steps S225, S230). The details of the shake limit shutter speed calculation subroutine and the flash emission / non-emission determination subroutine will be described later.

In the case of flash emission control (step S2)
30 (YES), control device 300 calculates control aperture value AVS and control shutter speed TVS for flash emission control (step S235). On the other hand, in the case of the flash non-emission control, that is, the steady light control (NO in step S230), control device 300 sets control aperture value A for the steady light control.
VS and control shutter speed TVS are calculated (step S240). The details of the AVS and TVS calculation subroutine for flash light emission control and the AVS and TVS calculation subroutine for steady light control will be described later.

Next, FIG. 7 shows a shake limit shutter speed calculation subroutine of step S220 in FIG. The controller 300 calculates the main subject shake amount Vs by subtracting the camera shake amount Vc obtained by the camera shake detection device 252 from the image shake amount Vcs obtained by the image plane sensor 180 as described above (step S300). Next, the allowable limit shake amount K1 is set to 50 μm (step S305), and Ts =
K1 / Vs is obtained (step S310), and the main subject shake limit shutter speed TVHs is further calculated according to the above equation (4).
Is calculated (step S315). Next, the above equation (1)
Are set (step S320), and the camera shake limit shutter speed TVHo is calculated according to equation (1) (step S325).

When the main subject shake limit shutter speed TVHs and the camera shake limit shutter speed TVHo are obtained, the control device 300 determines whether or not the camera shake correction function is on (step S330). If the camera shake correction function is ON (YES in step S330), the correction value ΔTV
b = f (B) is set (step S335). on the other hand,
When the shake correction function is off (N in step S330)
O), the correction value ΔTVb = 0 is set (step S34)
0). Next, the control device 300 determines whether TVHo and ΔTVb
Is used to calculate the camera shake limit shutter speed TVHh according to the above equation (2) (step S345).

When the main subject shake limit shutter speed TVHs and the camera shake limit shutter speed TVHh are obtained, the controller 300 compares the magnitudes of TVHs and TVHh (step S350). If TVHs is greater than TVHh (YES in step S350), control device 300 sets the value of main subject shake limit shutter speed TVHs as shake limit shutter speed TVH (step S35).
5). On the other hand, if TVHh is larger than TVHs (NO in step S350), control device 300 sets camera shake limit shutter speed TVH as shake limit shutter speed TVH.
The value of h is set (step S360). Further, the control device 300 determines which one of the synchro synchronizing speed TVX and the shake limit shutter speed TVH of the shutter unit 130 is the slower, the shake limit shutter speed TV for flash photography.
H2 is set (step S365).

Next, FIG. 8 shows a subroutine for judging whether or not to emit a flash in step S225 in FIG.
First, the control device 300 determines the shake limit shutter speed TVH2 for flash photography, and the open F value AV of the imaging lens 200.
0, and using the film sensitivity SV, a shake limit brightness BVH for flash emission determination is calculated according to the following equation (5) (step S400).

[0047]

(Equation 3)

Next, the control device 300 controls the main subject brightness BV.
S and the magnitude of the shake limit luminance BVH are compared (step S
405). The main subject luminance BVS is the shake limit luminance BV
H (darker) than Y (YE in step S405)
S), the main subject luminance BVS is low, the shutter speed becomes slow without the auxiliary light, and there is a very high possibility that photographing may fail due to camera shake or main subject shake. Therefore, the control device 300 sets the value of the shake limit luminance BVH as the control luminance BVT in order to emit the flash (step S41).
0). Further, the control device 300 controls the light emitting unit 150
It is determined whether or not is turned off (step S41)
5). When the light emitting unit 150 is on (NO in step S415), the control device 300 turns on a flash light emission request flag of the CPU (step S420) in order to perform photographing with flash light (light emission control in the dark).
On the other hand, when the light emitting unit 150 is off (step S4)
Since the photographer does not want to emit light from the flash (YES in 15), the control device 300 turns off the flash emission request flag to perform steady light imaging (step S42).
5).

In step S405, the main subject luminance B
If VS is higher (brighter) than shake limit luminance BVH (NO in step S405), control device 300 determines that control luminance BV is not necessary because flash is not required to be emitted.
The value of the main subject luminance BVS is set as T (step S430). Further, control device 300 determines whether light emitting unit 150 is set to automatic light emission or turned off (step S435). Light emitting unit 1
If 50 is the automatic light emission or off (Y in step S435)
ES), the control device 300 turns off the flash emission request flag to perform the steady light imaging (step S44).
0). When the light emitting unit 150 is on (step S4)
Since the photographer desires the forced light emission of the flash, the control device 300 turns on the flash light emission request flag (step S445).

Step S420, 425, 440 or S
When the flash emission request flag is turned on or off at 445, control device 300 calculates control exposure value EVT by adding film sensitivity SV to control brightness BVT (step S450).

Next, the control aperture value AVS and the control shutter speed T for the steady light control in step S240 in FIG.
FIG. 9 shows the VS calculation subroutine. The control device 300 determines whether the preset control mode of the camera 100 is a program automatic exposure control (Auto Exposure).
re: AE), aperture priority AE, shutter speed priority AE
Is determined (step S500).
In the case of manual exposure control, the main subject luminance BVS
Regardless of the control aperture value AVS and the control shutter speed TVS, the photographer determines the control aperture value AVS and the control shutter speed TVS.
In accordance with S, the aperture driving device 211 and the shutter unit 130 are controlled.

Next, the control device 300 controls the control exposure value EV.
It is determined whether T is higher than a value obtained by adding the open F value AV0 of the imaging lens 200 and the shake limit shutter speed TVH (step S505). Normally, when performing steady light imaging, the main subject luminance BVT is larger than the shake limit luminance BVH (NO in step S405 in FIG. 8), and step S4 is performed.
05, S430, S435, and S440 are executed in this order. In this case, EVT> AV0 + TVH
(YES in step S505), and assuming that the control mode is set to the program AE, the controller 300 sets the control aperture value AV according to the following equation (6).
S is calculated (step S510). Expression (6) is an example of a program, and is not limited to this.

[0053]

(Equation 4)

Next, the control device 300 controls the control exposure value EV.
The control shutter speed TVS is calculated by subtracting the calculated control aperture value AVS from T (step S51).
5). In the case of the aperture priority AE or the shutter speed priority AE, since the control aperture value AVS or the control shutter speed TVS is set in advance by the photographer, the step S510 is skipped, and the control shutter speed TVS or the unset control shutter speed TVS is skipped in the step S515. The control aperture value AVS is calculated.

Control aperture value AVS and control shutter speed T
When the VS is obtained, the control device 300 performs a limit process (step S520). The control aperture value AVS is a maximum F value (minimum aperture value) from the open F value AV0 of the imaging lens 200.
Only values between AVmax can be selected. Similarly, the control shutter speed is changed from the lowest shutter speed TVmin controllable by the shutter unit 130 to the highest shutter speed TV.
Only values between max can be selected. Therefore, step S
As an example of the limit process of 520, when the calculated control aperture value AVS becomes larger than the maximum F-number AVmax, the control aperture value AVS is fixed to AVmax, and the control shutter speed TVS in step S151 is corrected.
Further, when the control shutter speed TVS exceeds the highest shutter speed, the control shutter speed TVS is fixed to TVmax. In general, since a film has latitude, it is possible to obtain a proper photograph even if the film is slightly overexposed.

In step S505, EVT ≦ AV0
In the case of + TVH (NO in step S505), the main subject luminance BVS is lower (darker) than the shake limit luminance BVH.
(YES in step S405 in FIG. 8), and the flash is set to non-emission (YE in step S415).
S), steps S405, S410, S425, S45
The flowchart is executed in the order of 0. In this case, the control device 300 fixes the control aperture value AVS of the imaging lens 200 to the open F value AV0 (step S525), and calculates the control shutter speed TVS by subtracting the control aperture value AVS = AV0 from the control exposure value EVT. (Step S
530).

Control aperture value AVS and control shutter speed T
When the VS is obtained, the control device 300 performs a limit process (step S535). In this case, since EVT ≦ AV0 + TVH in step S505, step S530
The control shutter speed TVS obtained by the following equation: ≦ the shake limit shutter speed TVH. In other words, if you shoot as it is,
There is a very high possibility that photographing will fail due to camera shake or main subject shake. Therefore, as an example of the limit process in step S535, the control shutter speed TVS = TVH is fixed or the shutter release button is locked, and a warning sound or the like is generated, and Encourage the use of flash.

Next, FIG. 10 shows a subroutine for calculating the control aperture value AVS and the control shutter speed TVS for controlling the flash emission in step S235 in FIG. The control device 300 determines whether the preset control mode of the camera 100 is any of the program AE, the aperture priority AE, and the shutter speed priority AE (step S600). Note that the following processing is effectively performed by the program A
Only available when set to E, aperture priority A
If E and the shutter speed priority AE are set, the program AE may be forcibly switched, or a warning sound or the like may be generated to urge the photographer to change the set control mode. Good.

Next, the controller 300 sets the control exposure value EV
It is determined whether or not T is higher than a value obtained by adding the open F value AV0 of the imaging lens 200 and the shake synchro tuning speed TVX (step S605). Normally, when flash photography is performed, the main subject luminance BVT is smaller than the shake limit luminance BVH (YES in step S405 in FIG. 8), and the flowchart is executed in the order of steps S405, S410, S415, and S420. In this case, EVT ≦ AV0
Since it is + TVX (NO in step S605), the control device 300 fixes the control aperture value AVS = AV0 (step S610), and changes the control aperture value AV from the control exposure value EVT.
S = Control shutter speed TV by subtracting AV0
S is calculated (step S615).

When the control shutter speed TVS is determined, the control device 300 performs limit processing (step S62).
0). In this case, in step S605, EVT ≦ AV0 +
Since it is TVX, the calculated control shutter speed TVS
<= Synchro tuning speed TVX, and flash emission is possible. In recent years, a focal plane shutter in which the synchro tuning speed TVX is increased to about 1/250 second (TV8) has been put to practical use. 1/250 second (TV
The shutter speed of 8) belongs to a high speed even in steady light photographing, and is 1/1 which is an example of the above-mentioned camera shake limit shutter speed.
It is much faster than 5 seconds (TV4) or 1/8 seconds (TV3). Therefore, as an example of the limit processing in step S620, the control device 300 compares the control shutter speed TVS with the shake limit shutter speed TVH,
When TVS ≦ TVh, the control shutter speed TVS
= Fixed to TVH.

In step S605, EXT> AV0
In the case of + TVX, since the photographer wants to forcibly emit the flash light even though the constant light shooting is possible, the control device 300 fixes the control shutter speed TVS to the synchro tuning speed TVX (step S625), and sets the control exposure. Value E
The control aperture value AVS is calculated by subtracting the control shutter speed TVS = TVX from VT (step S63).
0).

When the control aperture value AVS is determined, the control device 3
00 performs limit processing (step S635). In this case, the proper exposure is obtained with the steady light, and the steady light has an overwhelmingly large amount of light compared with the flash light. Therefore, the shutter speed is substantially set to the synchro tuning speed in the shutter speed priority AE. The same is true. Step S63
As an example of the limit processing in 5, the control device 300
Compares the control aperture value AVS with the maximum F value (minimum aperture value) AVmax of the imaging lens 200, and AVS ≧ AVmax
At this point, the control aperture value AVS is fixed at AVmax.

As described above, according to the configuration of the first embodiment, the camera shake limit shutter speed TVHh and the main subject shake limit shutter speed T
Since the larger (faster) of the VHs is selected, it is possible to prevent a failure in imaging due to both main subject shake and hand shake.

(Second Embodiment) Next, a second embodiment of a camera system having a camera shake correction function according to the present invention will be described. The basic configuration of the second embodiment is substantially the same as that of the first embodiment. In the first embodiment, the main subject shake amount Vs is obtained by subtracting the camera shake amount Vc output from the camera shake detection device 252 from the image shake amount Vcs output from the image plane sensor 180. Then, the main subject shake amount Vs is obtained from the output of the image plane sensor 180.

FIG. 11 shows a screen shot by the image plane sensor 180 such as a two-dimensional CCD. As an example, the vertical and horizontal directions of the screen are each divided into three equal parts, and the screen is divided into regions 1 to 9
Divide into two. In general, the main subject is predominantly located in the area 5 in the center of the screen, so that the image of the area 5 is used as the main subject image, and the other areas 1 to 4 and 6 to 9
Is set as a background image.

When camera shake occurs in the camera 100, camera shake occurs uniformly in the images of all the areas 1 to 9. On the other hand, when a main subject shake occurs in the main subject located in the area 5 in the center of the screen, an image shake in which the hand shake and the main subject shake are combined occurs in the image in the area 5. Therefore, the main subject shake is obtained by subtracting the camera shake vector Vc obtained by averaging the image shake vectors of the images in the areas 1 to 4 and 6 to 9 in the peripheral part of the screen from the image shake vector Vcs obtained from the image in the area 5 in the center of the screen. The amount (main subject shake vector) Vs can be obtained.

The method of calculating the image blur vector of each image in each of the regions 1 to 9 is described in, for example,
As described in Japanese Patent No. 4371 and Japanese Unexamined Patent Publication No. Hei 4-326679, when calculating the center of luminance for each of the regions 1 to 9 and comparing the images in time series, the image is shifted up, down, left and right. Any method may be used as long as it is a method of calculating the correlation of the images at the time of the correlation, and calculating the motion vector from the shift amount when the correlation is the highest, and comparing the images in the respective regions 1 to 9 in time series. There is no particular limitation.

The main subject shake amount (main subject shake vector) Vs is only referred to when determining the shake limit shutter speed TVH, and is not corrected like the hand shake amount (hand shake vector) Vc. Therefore, even if the detection accuracy is slightly low, there is no significant effect on the photographing.

In the second embodiment, the image sensor 1
Since the screen imaged by the image 80 is divided into a plurality of parts, a certain area is required as a detection area of the image plane sensor 180. Therefore, compared to a camera that records an image on a silver halide film that requires an optical finder as shown in FIG. 1, an image is recorded on a magnetic recording medium using a solid-state imaging device without the need for an optical finder. This is particularly advantageous for a digital camera, a video camera, or the like that records a video.

(Third Embodiment) Next, a third embodiment of a camera system having a camera shake correction function according to the present invention will be described. In the first and second embodiments, the image plane sensor 180 is used. In the third embodiment, the main subject shake amount Vs is estimated from the image magnification β without using the image plane sensor. Note that the configuration of the camera according to the third embodiment is basically the same as that of the first embodiment shown in FIG. 1, and the point that the image plane sensor 180 is unnecessary and the block configuration of the exposure control unit shown in FIG. Are different. The operation of the third embodiment is basically the same as that of the first embodiment.
Are different in the method of calculating the shake limit shutter speed in step S220 in the AE calculation program shown in FIG. Other operations are substantially the same as those in the first embodiment.

As shown in FIG. 12, C
The PU and the like function as a camera shake limit shutter speed calculation unit 301, a main subject shake limit calculation unit 302, a shake limit shutter speed selection unit 303, an exposure calculation unit 304, a camera shake correction unit 305, and an image magnification calculation unit 307. The focal length detection device 212 is provided with the imaging lens 2 attached to the camera 100.
When 00 is a single focus lens, the focal length is detected. When the imaging lens 200 is a zoom lens, the current focal length is detected. The camera shake limit shutter speed calculation unit 301 and the image magnification calculation unit 307 of the control device 300 are detected. To enter. The focus position detection device 140 measures the distance to the main subject 2 and inputs the distance to the image magnification calculation unit 307.

The image magnification calculator 307 is provided with an image pickup lens 200
From the focal length f _L and the distance D to the main subject, the image magnification β on the focal plane 1 is calculated using, for example, the following approximate expression (7). Note that a is the height of the main subject, and b is the height of the image.

[0073]

(Equation 5)

Further, the main subject shake limit shutter speed TVHs is used to calculate the main subject shake limit shutter speed TVHs from a table stored in a memory or the like in advance.
F (β), which is a function of the image magnification β, a function f (β, f _L ) of the image magnification β and the focal length f _L of the imaging lens 200, and a function f (β, BVS)
Select one of

FIG. 13 shows an example of the table. FIG.
(A) is used when determining the main subject shake limit shutter speed TVHs based only on the image magnification β. FIG.
(B) is used to determine the main subject shake limit shutter speed TVHs based on the image magnification β and the focal length f _L of the imaging lens 200. FIG. 13C shows the image magnification β.
And the main subject luminance limit BVS is used to determine the main subject shake limit shutter speed TVHs. Based on this image magnification β, the main subject shake limit shutter speed TVH
In the method of determining s, the type of the main subject is specified to some extent from those involving the movement of a person, an animal, a vehicle, or the like, and the average moving speed is estimated. The above table is set on the assumption that the main subject is a person, and the numerical value is not limited to this. When the main subject is a race car or the like that moves at a high speed, a table that makes the main subject shake limit shutter speed TVHs even higher may be used.

As described above, since the main subject shake amount Vs cannot be corrected on the camera side, the present invention sets the shake limit shutter speed TVH to one of the main subject shake limit shutter speed TVHs and the camera shake limit shutter speed TVHh. By setting the value to a large (fast) value, it is intended to prevent both camera shake and main subject shake from occurring.
Therefore, even if the main subject shake limit shutter speed TVHs is set using such a rough selection method, no particular problem occurs.

FIG. 14 shows a shake limit shutter speed calculation subroutine of the third embodiment. Since the image magnification β, the focal length f _L of the imaging lens 200, and the main subject luminance BVS have already been obtained before the process reaches step S220 in the AE calculation program of FIG. 6, the control device 300 From the tables stored in the table, etc., as the main subject shake limit shutter speed TVHs, f (β), which is a function of the image magnification β, and a function f _L (β, f _L ) and one of the function f (β, BVS) of the image magnification β and the main subject luminance BVS (step S700).

When the main subject shake limit shutter speed TVHs is set, the control device 300 sets the coefficients C1 = 0 and C2 = 1 in the above equation (1) (step S70).
5) Calculate the camera shake limit shutter speed TVHo when there is no camera shake correction according to equation (1) (step S71).
0). Further, control device 300 determines whether or not the camera shake correction function is on (step S715), and if the camera shake correction function is on (YE in step S715).
S), the correction value ΔTVb = f (B) is set (step S720). On the other hand, when the camera shake correction function is off (NO in step S715), a correction value ΔTVb = 0 is set (step S725). Next, the control device 300
Using Ho and ΔTVb, the camera shake limit shutter speed TVHh is calculated according to the above equation (2) (step S73).
0).

Further, the control device 300 controls the TVHs and the TV
The magnitude of Hh is compared (step S735), and if TVHs is greater than TVHh (YE in step S735).
S), the value of the main subject shake limit shutter speed TVHs is set as the shake limit shutter speed TVH (step S).
740). On the other hand, when TVHh is greater than TVHs (NO in step S735), control device 300 sets camera shake limit shutter speed TH as shake limit shutter speed TVH.
The value of VHh is set (step S745). further,
The control device 300 sets the slower of the synchro tuning speed TVX and the shake limit shutter speed TVH of the shutter unit 130 to the shake limit shutter speed TVH2 for flash photography (step S750).

As described above, according to the third embodiment, an image plane sensor is not required as compared with the first or second embodiment, so that the configuration of the camera system is simplified and the cost can be reduced. become.

(Fourth Embodiment) Next, a camera system having a camera shake correction function according to a fourth embodiment of the present invention will be described. In the first to third embodiments, the larger (faster) value of the camera shake limit shutter speed TVHh and the main subject shake limit shutter speed TVHs is automatically set as the shake limit shutter speed TVH. In the fourth embodiment, the shake limit shutter speed can be set according to the photographer's will. Note that the configuration of the camera of the fourth embodiment is basically the same as that of the first embodiment shown in FIG. 1, and the block configuration of the exposure control unit shown in FIG. 15 is different. The operation of the fourth embodiment is basically the same as that of the first embodiment, and the method of calculating the shake limit shutter speed in step S220 in the AE calculation program shown in FIG. 6 is different. Other operations are substantially the same as those in the first embodiment.

FIG. 15 shows a block configuration of an exposure control unit according to the fourth embodiment. The CPU or the like of the control device 300 functions as a camera shake limit shutter speed calculation unit 301, a main subject shake limit calculation unit 302, a control mode selection unit 308, an exposure calculation unit 304, a camera shake correction unit 305, and a main subject shake detection unit 306. The configuration other than the control mode selection unit 308 is the same as that of the first embodiment shown in FIG. 2, and a description thereof will be omitted.

When the photographer selects the camera shake correction priority control mode, the control mode selection unit 308
Camera shake limit shutter speed TV without considering main subject shake
Let Hh be the final shake limit shutter speed TVH. When the other control mode is selected, the larger (faster) of the camera shake limit shutter speed TVHh and the main subject shake limit shutter speed TVHs is set as the final shake limit shutter speed TVH.

FIG. 16 shows a shake limit shutter speed calculation subroutine of the fourth embodiment. The control device 300 performs, for example, steps S300 to S315 of the shake limit shutter speed calculation subroutine in the first embodiment shown in FIG.
The same processing as that described above is performed, and the main subject shake limit shutter speed T
VHs is calculated (step S800). Next, the control device 300 performs the same processing as in steps S320 to S325, and calculates the camera shake limit shutter speed TVHo when there is no camera shake correction (step S805). Further, control device 300 determines whether or not the camera shake correction function is on (step S810). If camera shake correction function is on (YES in step S810), correction value ΔT
Vb = f (B) is set (step S815). On the other hand, when the camera shake correction function is off (NO in step S810), a correction value ΔTVb = 0 is set (step S8).
20). Next, the control device 300 sets the TV Ho and the ΔTV
Using b, the camera shake limit shutter speed TVHh is calculated according to the above equation (2) (step S825).

Further, control device 300 determines whether or not the camera shake correction priority mode has been set (step S830). If the camera shake correction priority mode is not set (NO in step S830), control device 300 sets T
The magnitudes of VHs and TVHh are compared (step S83).
5). If TVHs is greater than TVHh (YES in step S835), control device 300 sets main subject shake limit shutter speed TV as shake limit shutter speed TVH.
The value of Hs is set (step S840). On the other hand, TV
If Hh is greater than TVHs (NO in step S835), control device 300 causes shake limit shutter speed TVH.
The value of the camera shake limit shutter speed TVHh is set (step S845).

If the camera shake correction priority mode is set (YES in step S830), control device 300 sets camera shake limit shutter speed TVHh as camera shake limit shutter speed TVH without considering main subject shake limit shutter speed TVHs. (Step S845). Further, the control device 300 sets the slower of the synchro tuning speed TVX and the shake limit shutter speed TVH of the shutter unit 130 as the shake limit shutter speed TVH2 for flash photography (step S850).

As described above, according to the fourth embodiment, when it is not necessary to consider the main subject shake much, for example, in panning shot or still life shooting, the camera shake correction is prioritized and the slower shutter speed is set. It is possible to shoot with.

Note that the main subject shake detection method by the main subject shake detection unit 306 is not limited to the case where the image plane sensor 180 and the camera shake detection device 252 are used as in the first embodiment, but the second embodiment. The method using only the image plane sensor 180 as described above may be used. Needless to say, the same function can be obtained by using the image magnification detecting unit 307 of the third embodiment shown in FIG. 12 instead of the main subject shake detecting unit 306.

(Other Embodiments) In each of the above embodiments, a 35 mm camera has been exemplified as the camera 100. Therefore, the camera shake limit shutter speed T when there is no camera shake correction.
When calculating VHo, the coefficient C1 = 0 in equation (1),
C2 = 1 was set. However, in other four-cut cameras such as an APS camera, the camera shake limit shutter speed is not always the reciprocal of the focal length f _L of the imaging lens 200. In this case, it goes without saying that the values of C1 and C2 are appropriately adjusted. No.

Further, it is needless to say that the present invention is not limited to a camera using a silver halide film, but can be applied to a digital camera or a video camera using a solid-state image sensor.

[0091]

As described above, according to the present invention, the amount of camera shake is detected using the angular velocity sensor or the like of the camera shake detection device.
The camera shake limit shutter speed T based on the detected camera shake amount
VHh is calculated, and the main subject shake limit shutter speed TVHs is calculated using the main subject shake amount detected using the image plane sensor or the like, and the camera shake limit shutter speed TVH is calculated.
h or the main subject shake limit shutter speed TVHs, whichever is higher, calculates the optimal exposure value as the shake limit shutter speed TVH, so that it is possible to perform camera shake correction and prevent main subject shake from occurring. It is possible to reduce the probability of failure in shooting.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a camera having a camera shake correction function according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a block configuration of an exposure control unit according to the first embodiment.

FIGS. 3A and 3B are diagrams illustrating an example of a program diagram according to the first embodiment, in which FIG. 3A is a program diagram in a flash automatic light emission mode, and FIG. 3B is a main subject shake amount Vs;
FIG. 9 shows a program diagram in a case where the shake limit shutter speed for flash photography is selected in accordance with the magnitude of.

FIG. 4 is a flowchart illustrating a main routine of an imaging operation according to the first embodiment.

FIG. 5 is a flowchart continued from FIG. 4;

FIG. 6 is a flowchart showing an AE calculation subroutine of step S125 in FIG. 4;

FIG. 7 is a flowchart illustrating a shake limit shutter speed calculation subroutine of step S220 in FIG. 6;

FIG. 8 is a flowchart showing a flash light emission / non-light emission determination subroutine of step S225 in FIG. 6;

9 is a flowchart showing a control aperture value AVS and control shutter speed TVS calculation subroutine for steady light control in step S240 in FIG.

10 is a diagram showing a control aperture value AVS and a control shutter speed T for flash light emission control in step S235 in FIG. 6;
It is a flowchart which shows a VS calculation subroutine.

FIG. 11 is a diagram illustrating a shooting screen by an image plane sensor according to a second embodiment of the present invention.

FIG. 12 is a diagram illustrating a block configuration of an exposure control unit according to a third embodiment of the present invention.

13A and 13B are diagrams illustrating an example of a table illustrating a relationship between an image magnification and a main subject shake limit shutter speed TVHs according to the third embodiment. FIG. 13A illustrates a main subject shake limit shutter based on only the image magnification β. (B) is used when determining the main subject shake limit shutter speed TVHs based on the image magnification β and the focal length fL of the imaging lens 200, and (c) is used when determining the speed TVHs.
And the main subject luminance limit BVS is used to determine the main subject shake limit shutter speed TVHs.

FIG. 14 is a flowchart illustrating a shake limit shutter speed calculation subroutine according to a third embodiment.

FIG. 15 is a diagram illustrating a block configuration of an exposure control unit according to a fourth embodiment of the present invention.

FIG. 16 is a flowchart illustrating a shake limit shutter speed calculation subroutine according to a fourth embodiment.

[Explanation of symbols]

1: focal plane of imaging lens 2: main subject 100: camera 110: mirror box 111: main mirror 112: auxiliary mirror 120: finder 130: shutter unit 140: focal position detecting device 150: light emitting unit 160: image plane sensitivity detecting device 170: photometric device (photometric device) 180: image plane sensor 200: imaging lens 210: aperture 211: aperture drive device 212: focal length detecting device (focal length detecting device) 250: shake correction lens (camera shake correcting device) 251: correction Lens driving device (camera shake correction unit) 252: camera shake detection device (camera shake correction unit) 300: control device 301: camera shake limit shutter speed calculation unit (camera shake limit shutter speed calculation unit) 302: main subject shake limit shutter speed calculation unit (main Subject shake limit shutter speed calculation means) 30 : Shake limit shutter speed selection unit (shake limit shutter speed selection unit) 304: exposure calculation unit (exposure calculation unit) 305: hand shake correction unit (hand shake correction unit) 306: main subject shake detection unit (main subject shake detection unit) 307 : Image magnification calculator (image magnification calculator) 308: Control mode selector (control mode selector)

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 18, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

Claims (13)

[Claims] 1. A camera shake correction function comprising an exposure calculation means for calculating a camera shake limit shutter speed using focal length information of an imaging lens and camera shake correction information, and correcting the camera shake limit shutter speed using main subject shake information. Camera system. 2. A camera shake correction means for detecting at least a camera shake amount and correcting the camera shake based on the camera shake amount, a photometric means for measuring subject brightness and outputting brightness information, and causing a camera shake at a lower speed. A camera shake limit shutter speed calculating means for calculating a camera shake limit shutter speed; a main subject shake limit shutter speed calculating means for calculating a main subject shake limit shutter speed which causes a main subject shake when the shutter speed is lower than the camera shake limit shutter speed; A shake limit shutter speed selecting means for selecting a higher one of the main subject shake limit shutter speeds as a shake limit shutter speed, and an exposure calculating means for calculating an optimal exposure value using the shake limit shutter speed and luminance information. A camera system having a camera shake correction function. 3. The camera shake limit shutter speed calculation means includes a focal length detection means for detecting a focal length of the imaging lens, and uses the camera shake correction information output from the camera shake correction means and the detected focal length information to perform a camera shake limit shutter. The main subject shake limit shutter speed calculating means for calculating the speed includes main subject shake detection means for detecting the main subject shake amount, and calculating the main subject shake limit shutter speed using the detected shake amount information. A camera system having a camera shake correction function according to claim 2. 4. The main subject shake detecting means includes an image plane sensor provided at a position relatively equal to the focal plane of the imaging lens, for detecting image shake, and detects the detected image shake information and the camera shake from the camera shake correcting means. 4. The camera system having a camera shake correction function according to claim 3, wherein a difference from the information is used as a main subject shake amount. 5. The main subject shake detection means includes an image plane sensor provided at a position relatively equal to a focal plane of an imaging lens and detecting an image shake, and divides a screen into a plurality of regions by the image plane sensor. Calculating an image shake amount for each of the divided areas, and using a difference between the image shake amount of the area where the main subject exists and the average image shake amount of the other areas as the main object shake amount. Item 4. A camera system having a camera shake correction function according to Item 3. 6. The camera shake limit shutter speed calculation means includes a focal length detection means for detecting a focal length of the imaging lens, and uses the camera shake correction information output from the camera shake correction means and the detected focal length information to perform a camera shake limit shutter. A main subject shake limit shutter speed calculating unit that calculates a speed; a distance measuring unit that measures a distance to the main subject; and an image magnification calculation that calculates an image magnification using the focal length information and the distance information to the main subject. 3. A camera system having a camera shake correction function according to claim 2, further comprising means for calculating a main subject shake limit shutter speed based on an image magnification. 7. The camera shake correction function according to claim 6, wherein the main subject shake limit shutter speed calculating means calculates the main subject shake limit shutter speed based on the image magnification and the focal length of the imaging lens. Camera system. 8. A camera system having a camera shake correction function according to claim 6, wherein said main subject shake limit shutter speed calculating means calculates a main subject shake limit shutter speed based on image magnification and luminance information. 9. An exposure calculating means for calculating main subject luminance using luminance information from the photometric means, and a shake limit luminance using a shake limit shutter speed and an open aperture value of the imaging lens. , A flash limit determining means for comparing the main subject brightness with the shake limit brightness to determine flash emission or non-flash, and a determination result of the flash limit determining means and the main subject brightness. 3. A camera system having a camera shake correction function according to claim 2, further comprising a control exposure calculating means for calculating a control aperture value and a control shutter speed used for photographing. 10. When the main subject luminance is lower than the shake limit luminance and flash emission is possible, the control aperture value is set to the open aperture value of the imaging lens, and the control shutter speed is set using the main subject luminance and the open aperture value. 10. The camera system according to claim 9, wherein the flash light emission control is performed by calculating the lower limit value of the control shutter speed as a shake limit shutter speed. 11. When the main subject brightness is lower than the shake limit brightness and flash emission is impossible, the control aperture value is set to the open aperture value of the imaging lens, and the control shutter speed is set to the shake limit shutter speed. 10. The camera system having a camera shake correction function according to claim 9, wherein light is controlled. 12. When the main subject luminance is higher than the shake limit luminance and the flash is forcibly fired, the control shutter speed is set to a predetermined shutter speed capable of synchronizing synchronization and faster than the shake limit shutter speed. 10. A camera system having a camera shake correction function according to claim 9, wherein a control aperture value is calculated by using the shutter speed and the control value, and a flash emission control is performed using an upper limit value of the control aperture value as a minimum aperture value of the imaging lens. 13. The exposure calculating means includes a control mode determining means, and when the camera shake correction priority mode is set,
3. The camera system having a camera shake correction function according to claim 2, wherein the camera shake limit shutter speed is set to the lower limit value of the control shutter speed regardless of the camera shake limit shutter speed.