JP6727920B2 - Imaging device and control method - Google Patents

Description

The present invention relates to light emission control of a lighting device used during photography.

Conventionally, when an illuminating device is used during shooting, the illuminating device is pre-flashed prior to shooting (exposure), and the light emission intensity of the flash (main flash) during shooting is determined based on the photometric value of the pre-emission subject reflected light. A method of controlling the light emission time is known. A method is also known in which the emission intensity of main emission and the emission time are controlled so that the face area detected by face detection has good brightness. Patent Document 1 proposes a technique for determining the degree of consideration of a face in determining the flash emission amount based on the movement of a digital camera or a subject.

JP, 2008-104156, A

However, in the technique described in Patent Document 1, even if it is desired to increase the degree of consideration of the face in determining the flash emission amount, the degree of consideration may be reduced.

Therefore, an object of the present invention is to make it possible to determine a favorable light emission amount for a face area detected by face detection.

In order to achieve the above-mentioned object, the image pickup apparatus according to the present invention is an image pickup apparatus capable of photographing using an illuminating device, and performs face detection using an image acquired before pre-lighting the illuminating device. Face detection means, brightness calculation means for calculating the reflection brightness corresponding to the reflection component of the pre-emission reflected by the subject when the lighting device is pre-lighted, and the face detection calculated by the brightness calculation means Discriminating means for discriminating whether or not the reflected luminance in the area corresponding to the face area detected by the means is within a predetermined luminance range; and an area in which the reflected luminance is discriminated by the judging means within the predetermined luminance range. And a determination unit that determines the amount of light emitted from the lighting device by setting the weighting of the lighting device greater than the weighting of other regions, and the determination unit determines the predetermined luminance range according to the state of the lighting device. It is characterized by changing.

According to the present invention, it is possible to determine a favorable light emission amount for a face area detected by face detection.

It is a block diagram which shows the structure of the imaging device concerning embodiment of this invention. It is a figure for demonstrating the imaging process in the imaging device which concerns on the form of this invention. It is a figure for demonstrating the light emission amount determination process in the imaging device which concerns on the form of this invention. It is a figure for demonstrating the brightness range according to the state of the illuminating device in the imaging device which concerns on the form of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a camera system according to the present embodiment. The camera system according to the present embodiment includes a camera body 100 that is an imaging device, a lens unit 200 that is attachable to and detachable from the camera body 100, and a strobe device 300 that is an illumination device that is attachable to and detachable from the camera body 100.

First, the configuration of the camera body 100 will be described. A camera CPU (hereinafter referred to as CPU) 101 controls each unit of the camera body 100. The memory 102 is a memory such as a RAM or a ROM connected to the CPU 101, and the CPU 101 performs various processes according to various programs stored in the memory 102.

The image pickup device 103 is an image pickup device such as a CCD or a CMOS including an infrared cut filter, a low pass filter, etc., and photoelectrically converts a light flux incident via the lens unit 200 to output an image signal.

The shutter 104 travels so as to be in a light-shielding state in which the image pickup element 103 is shielded from a light flux incident via the lens unit 200 and a retracted state in which the light flux incident via the lens unit 200 is guided to the image pickup element 103.

The half mirror 105 is movable to a position (a mirror-up state) in which a light beam incident through the lens unit 200 is guided to the image sensor 103 and a position (a mirror-down state) to guide the light beam to the photometric sensor 107. That is, the half mirror 105 changes the optical path of the light flux incident through the lens unit 200, depending on whether it is guided to the image sensor 103 or to the photometric sensor 107. Further, when it is at the position where it is guided to the photometric sensor 107, the light flux incident through the lens unit 200 is imaged on the focusing plate 106.

As the photometric sensor (AE sensor) 107, a charge storage type image pickup element such as CCD, CMOS or the like for accumulating charges according to the amount of incident light is used. Based on the output image signal, the CPU 101 can perform not only photometry, but also subject face detection, subject tracking, light source detection, flicker detection, and the like. The pentaprism 108 guides the light flux incident on the half mirror 105 through the lens unit 200 to the photometric sensor 107 and the optical finder 109.

The AF mirror 110 guides a part of the light flux that has entered through the lens unit 200 and passed through the half mirror 105 to a focus detection circuit (AF circuit) 111 that performs focus detection for AF control.

Next, the configuration of the lens unit 200 will be described. A lens CPU 201 (hereinafter, referred to as LCPU) controls each unit of the lens unit 200, for example, a focus lens, a zoom lens, a diaphragm driving unit, and the like, and transmits information about the lens to the CPU 101. The information regarding the lens includes information regarding the subject distance such as focus position information corresponding to the focus lens position and focal length information corresponding to the zoom lens position.

Next, the configuration of the flash device 300 will be described. The strobe device 300 includes a main body portion 300a that is detachably attached to the camera main body 100, and a movable portion 300b that is rotatably held in the vertical and horizontal directions with respect to the main body portion 300a. In the present embodiment, the side of the main body 300a connected to the movable portion 300b is the upper side, and the left and right sides viewed from the optical finder 109 side in FIG. 1 are the left side and the right side, respectively.

A strobe CPU (hereinafter referred to as SCPU) 301 controls each unit of the strobe device 300. The SCPU 301 has a microcomputer built-in one-chip IC circuit configuration including, for example, a CPU, a ROM, a RAM, an input/output control circuit (I/O control circuit), a multiplexer, a timer circuit, an EEPROM, an A/D, and a D/A converter. There is.

The light emission control circuit 302 includes a booster circuit for boosting the battery voltage to light the discharge tube 305, which will be described later, and a current control circuit for controlling the start and stop of light emission. Note that the booster circuit and the current control circuit may be known circuits, and detailed description thereof will be omitted.

The zoom optical system 303 including an optical panel and the like is held so that the relative position between the discharge tube 305 and the discharge tube 305 can be changed. By changing the relative position between the discharge tube 305 and the zoom optical system 303, the guide of the strobe device 300 can be obtained. The number and irradiation range can be changed. The reflector 304 reflects the light emitted from the discharge tube 305 and guides it toward the optical panel of the zoom optical system 303. The light emitting section of the flash device 300 is mainly composed of a discharge tube 305, a reflector 304, and a zoom optical system 303, and the irradiation range of the light emitting section is changed by the movement of the zoom optical system 303, and the light emitting section is irradiated. The direction is changed by the rotation of the movable part 300b. As the light source, an LED or the like may be used instead of the discharge tube 305.

Next, the operation of the camera body 100 will be described with reference to the flowchart shown in FIG. Here, it is assumed that the camera body 100 is powered on and is in a standby state for image capturing.

In step S101, the CPU 101 determines whether the first stroke (hereinafter, referred to as SW1) of the shutter switch provided in the camera body 100 is on or off. If it is on, the process proceeds to step S102, and if it is off, step S101 is repeated. In step S102, the CPU 101 drives the photometric sensor 107 and performs photometric calculation, face detection calculation, subject tracking calculation, light source detection calculation, flicker detection calculation, etc. based on the output image signal (hereinafter referred to as image). .. Then, the CPU 101 stores each calculation result in the memory 102.

In step S103, the CPU 101 uses the focus detection circuit 111 to perform a phase-difference AF (autofocus) process. For example, in step S102, face detection calculation is performed to detect the defocus amount of the focus detection point corresponding to the detected face area. Then, the CPU 101 transmits the lens drive amount according to the defocus amount detected by the LCPU 201, and the LPU 201 drives the focus lens based on the received lens drive amount.

In step S104, the CPU 101 determines whether the second stroke of the shutter switch (hereinafter referred to as SW2) is on or off. If it is on, the process proceeds to step S105, and if it is off, the process proceeds to step S101. In step S105, the CPU 101 drives the photometric sensor 107 and the strobe device 300 to perform photometry before pre-flash (non-flash photometry) and pre-flash photometry (pre-flash photometry) to determine the amount of light emission during actual shooting. Determine the (main light emission amount). The details of step S105 will be described later.

In step S106, the CPU 101 performs main shooting (main exposure) based on the exposure control value (shutter speed, aperture value, shooting sensitivity) determined in the photometric calculation of step S102 and the main light emission amount determined in step S105. ..

FIG. 3 is a flowchart showing details of the light emission amount determination processing executed in step S105 of FIG.

In step S201, the CPU 101 drives the photometric sensor 107 to acquire an image signal before pre-emission (hereinafter referred to as a non-emission image). Further, the CPU 101 stores the obtained non-emission image in the memory 102.

In step S202, the CPU 101 transmits a pre-flash instruction to the SCPU 301 to cause the strobe device 300 to pre-flash, and drives the photometric sensor 107 in accordance with the pre-flash to drive an image signal at the time of pre-flash (hereinafter referred to as a pre-flash image. Get). Further, the CPU 101 stores the obtained pre-emission image in the memory 102.

In step S203, the CPU 101 subtracts the non-emission image from the pre-emission image to generate an image signal indicating a reflection component of the pre-emission (hereinafter referred to as a pre-emission reflection image). Further, the CPU 101 stores the pre-emission reflection image in the memory 102.

In step S204, the CPU 101 performs pre-emission reflection luminance calculation using the pre-emission reflection image generated in step S203 to calculate the pre-emission reflection luminance AVE. For example, if the light control mode is the center-weighted light control mode, the image is divided into a plurality of light measurement areas, the brightness is calculated for each light measurement area, and the weighting coefficient for the light measurement area near the center of the image is calculated for the periphery of the image. The weighted average is made larger than the weighting coefficient. Further, in the case of having the characteristic region detecting function, in the imaging mode using the characteristic region detecting function, the weighted average is set so that the weighting coefficient for the photometric area corresponding to the characteristic region is larger than the weighting coefficients for the other photometric areas. In addition, the method for determining the weighted average weighting coefficient at the time of brightness calculation may be appropriately set.

In step S205, the CPU 101 acquires face area information (coordinates in the image and size W[n] of the face area) of the human subject in the image acquired in step S102 or the non-emission image acquired in step S201. Here, in order to acquire the face information of the human subject in the image acquired in step S102, the calculation result stored in the memory 102 may be read. Further, when acquiring the face information of the human subject in the non-emission image acquired in step S201, the CPU 101 may perform the face detection calculation in this step. A known method may be used for the face detection calculation method, and detailed description thereof will be omitted.

In step S206, the CPU 101 calculates the luminance (hereinafter, referred to as face area reflection luminance) F[n] in the area indicated by the face area information acquired in step S205 for the pre-emission reflection image generated in step S203. To do. Here, the face area reflection brightness F for n persons indicated by the face area information acquired in step S205 is calculated.

In step S207, the CPU 101 sets a brightness range for determining whether or not the area indicated by the face area information acquired in step S205 is an actual person's face area even during pre-emission. Then, the CPU 101 calculates the average face area reflection brightness FAVE using the face area reflection brightness F[n] that is within the set brightness range. The method of setting the brightness range and calculating the average face area reflection brightness FAVE will be described later.

In step S208, the CPU 101 calculates the correction value FC based on the average face area reflection brightness FAVE by the expression (1).
FC=(FAVE-AVE)×0.5...(1)

In step S209, the CPU 101 calculates the difference DF between the target brightness value Yt and the sum of the pre-emission reflection brightness AVE calculated in step S204 and FC calculated in step S208, according to equation (2). Here, the target brightness value Yt is a target brightness value at the time of actual shooting.
DF=(AVE+FC)-Yt... (2)

From the difference DF and the light emission amount during the pre-light emission, the CPU 101 determines the light emission amount during the main light emission (main light emission amount) FLASH by the formula (3).
FLASH=(emission amount during pre-emission)-DF...(3)

When determining the main light emission amount by the formulas (1), (2), and (3), the weighting of the area within the predetermined brightness range set by the face area reflection brightness F[n] is performed by the weighting of other areas. Will be larger than.

The CPU 101 transmits the light emission amount FLASH during the main light emission to the SCPU 301.

The above is the light emission amount determination processing executed in step S105.

Next, the method of setting the brightness range and calculating the average face area reflection brightness FAVE executed in step S207 will be described.

There is a method of setting the brightness range using either the subject distance Df calculated from the face area information or the distance information D based on the subject distance information received from the lens unit 200.

First, a method of setting the brightness range using the face area information and calculating the average face area reflection brightness FAVE will be described.

The CPU 101 calculates the object distance Df to the subject based on the size W[n] of the face area acquired in step S205 and the focal length information received from the LCPU 201.

Here, if the focal length information is FL, the size of the face area is Wf[n], and the conversion coefficient determined by the actual size of the face of the person is K1, the subject distance Df can be calculated by equation (4). It is calculated.
Df[n]=FL×K1÷Wf[n] (4)

Although the actual size of the person's face varies with age and individual differences, the conversion factor K1 is determined for the actual size of the person's face (width) assuming the standard size of 150 mm.

Next, the CPU 101 calculates the reflection luminance LVL1 in the case of the subject having the standard reflectance (18%) at that distance from the subject distance Df and the information C1 regarding the light emission amount at the time of the pre-light emission by the formula (5). To do.
LVL1[n]=−log ₂ (Df[n])×2+C1 (5)

Here, the actual reflectance of the face is about 7% to 46%, although there are individual differences depending on race, sex, and age. That is, it has a width of ±1.4 steps in APEX value with respect to LVL1[n].

The actual face size is about 120 mm to 185 mm, although there are individual differences depending on race, sex, and age. That is, with respect to the standard size LVL of 150 mm, the APEX value changes ±0.6 steps.

That is, it is assumed that the actual reflection luminance of the face is within the range of LVL1[n]±2.0 steps with respect to the reflection luminance LVL1[n] of the standard reflectance of 18% and the standard size of 150 mm. , LVL1[n]±2.0 steps is set as a standard brightness range for each face area.

However, in the standard brightness range, the reflected brightness of the actual face may not be within the brightness range depending on the state of the strobe device 300. Therefore, in the present embodiment, the CPU 101 receives information regarding the state of the strobe device 300 from the SCPU 301 and changes the brightness range according to the state of the strobe device 300. The information on the state of the strobe device 300 is information indicating the rotating state of the movable part 300b of the strobe device 300 with respect to the main body part 300a, information indicating whether or not the strobe device 300 is used in a strobe multi-lamp system, and mounting an optical accessory. It includes information indicating whether or not there is an item.

FIG. 4 is a diagram showing a brightness range according to the state of the flash device 300. Note that one memory on the vertical axis of FIG. 4 corresponds to one stage of the APEX value.

As shown in FIG. 4A, in the normal time, the standard brightness range, which is ±2.0 steps with respect to LVL1, is set as the brightness range. Here, what kind of state the normal time is will be described. First, the rotation angle of the movable portion 300b of the strobe device 300 in the vertical direction and the horizontal direction with respect to the main body portion 300a is 0° (normal position). In addition, it is not used in a multi-strobe system. Furthermore, optical accessories such as a color filter and a bounce adapter are not attached to the front of the optical panel of the movable portion 300b. As described above, the normal state is a state in which the movable portion 300b of the strobe device 300 is not rotated from the normal position with respect to the main body portion 300a, and the strobe device 300 is used alone without mounting an optical accessory.

As shown in FIG. 4B, during bounce photography in which the movable portion 300b of the strobe device 300 is rotated from the normal position with respect to the main body portion 300a, the brightness range is made different from that in the normal state. Bounce shooting is a shooting method in which light is emitted toward a ceiling or a wall and the subject is irradiated with indirect light reflected by the ceiling or the wall. Since the distance and reflectance of the ceiling or wall used for bounce shooting are unknown, it is unknown how much the amount of light that reaches the subject will actually decrease with respect to the amount of light emitted by the strobe device 300. Therefore, during bounce shooting, the lower limit side of the brightness range is widened compared to the normal time. Increasing the lower limit of the brightness range with respect to the normal time includes making the lower limit value of the brightness range lower than that of the normal time and not providing the lower limit value of the brightness range. If light emission toward the ceiling or a wall is performed before the light emission amount determination processing and the subject brightness at that time is calculated to estimate the degree of light amount reduction during bounce shooting, FIG. As shown in, the luminance range may be offset from the normal time according to the estimated degree of decrease in light amount. FIG. 4C shows an example in which the reduction in the light amount is five steps as compared with the normal time. As described above, as long as it is possible to estimate how much the amount of light decrease during bounce shooting can be estimated, not only the lower limit value of the luminance range but also the upper limit value of the luminance range is made different from the normal state.

As shown in FIG. 4D, when used in a strobe multi-flash system, the brightness range is made different from that in normal time. The strobe multi-flash system is a system in which a plurality of strobe devices simultaneously emit light by wireless communication or the like. In such a strobe multi-light system, since a strobe device other than the strobe device mounted on the image pickup device is arranged and used at an arbitrary position apart from the image pickup device, the strobe device 300 actually emits light. It is unknown how much the amount of light reaching the subject will increase. Therefore, when used in a strobe multi-flash system, the upper limit side of the luminance range is widened as compared with the normal state. Increasing the upper limit of the brightness range from the normal time includes making the upper limit value of the brightness range higher than that of the normal time and not providing the upper limit value of the brightness range.

As in the case of bounce shooting, if you want to estimate the amount of light increase by flashing simultaneously with multiple flash units and calculating the subject brightness at that time before the flash output determination process, estimate The brightness range may be offset from the normal time according to the degree of increase in the amount of light.

As shown in FIG. 4E, when an optical accessory such as a color filter or a bounce adapter is attached, the amount of light decreases due to the influence of the optical accessory, so the lower limit side of the brightness range is widened compared to the normal time. Increasing the lower limit of the brightness range with respect to the normal time includes making the lower limit value of the brightness range lower than that of the normal time and not providing the lower limit value of the brightness range. If the dimming characteristic of the optical accessory is known, the brightness range may be offset by the optical accessory according to the degree of decrease in the light amount. If the dimming characteristic of the optical accessory is stored in the strobe device 300 in advance, information about the dimming characteristic of the optical accessory may be received from the strobe device 300 and used for setting the brightness range. Alternatively, before the light emission amount determination processing, the degree of decrease in the light amount may be estimated by emitting light with a strobe device equipped with an optical accessory and calculating the subject brightness at that time. The above is an example of the luminance range according to the state of the flash device 300.

After setting the brightness range, the CPU 101 determines whether each face area reflection brightness F[n] is within the brightness range according to the state of the flash device 300, and the face area reflection brightness within the brightness range is determined. The average face reflection brightness FAVE using only the above is calculated. In other words, it is determined whether or not the reflection brightness in the area corresponding to the detected face area, which corresponds to the reflection component of the pre-emission reflected by the subject when the strobe device 300 is pre-emitted, is within a predetermined brightness range. The average brightness of the areas determined to be within the brightness range is calculated.

Next, a method of setting the brightness range using the distance information D based on the information about the subject distance received from the lens unit 200 and calculating the average face area reflection brightness FAVE will be described.

The CPU 101 calculates the reflection luminance LVL2 for the subject having the standard reflectance (18%) at that distance from the distance information D and the information C1 regarding the amount of light emission at the time of pre-emission according to the equation (6).
LVL2=−log ₂ (D)×2+C1 (6)

As mentioned above, the actual facial reflectance is about 7% to 46%. That is, it has a width of ±1.4 steps in APEX value with respect to LVL2.

That is, since it is assumed that the actual reflection brightness of the face falls within LVL2±1.4 steps with respect to the reflection brightness LVL2 having the standard reflectance of 18%, the CPU 101 sets the LVL2±1.4 steps to the standard brightness range. Set to. When this calculation method is used, a brightness range is not set for each face area, but a common brightness range is set for all face areas.

Even when this calculation method is used, as described above, the CPU 101 receives information regarding the state of the strobe device 300 from the SCPU 301 and changes the brightness range according to the state of the strobe device 300.

After setting the brightness range, the CPU 101 determines whether each face area reflection brightness F[n] is within the brightness range according to the state of the flash device 300, and the face area reflection brightness within the brightness range is determined. The average face reflection brightness FAVE using only the above is calculated.

As described above, in the present embodiment, in the face detection area detected by the face detection calculation using the image acquired before the pre-emission, in order to determine whether or not the face area is present even during the pre-emission, The reflection component of the pre-emission and the threshold value (the upper limit value and the lower limit value of the brightness range) are compared. By comparing this reflection component with the threshold value, it is possible to reduce that the area other than the face area (the area where there are no high-reflecting objects or subjects) is regarded as the face area, and it is possible to obtain good light emission for the face detected by the face detection. The quantity can be calculated. Further, since the threshold value is changed according to the state of the lighting device, it is possible to accurately calculate a favorable light emission amount for the face detected by the face detection.

It should be noted that in the present embodiment, among the face detection areas detected by the face detection calculation using the image acquired before the pre-emission, the area that may be considered to have the face area even during the pre-emission is determined, and based on the determination result. Equation (1), (2), and (3) are used to determine the main light emission amount. However, in the face detection area detected by the face detection calculation using the image acquired before the pre-emission, the main light emission amount determination process other than the area in which the face area may be considered to exist even during the pre-emission is determined. The processing is not limited to the above. For example, the difference DF′ between the average face area reflection brightness FAVE and the target brightness value Yt may be calculated, and the main light emission amount may be determined from the difference DF′ and the light emission amount at the time of pre-light emission. Alternatively, the pre-emission reflection brightness AVE and the target brightness value are calculated by calculating the pre-emission reflection brightness AVE without performing the calculation of the average face area reflection brightness FAVE and performing the weighted average calculation in which the determined area is weighted more than other areas. The main light emission amount may be determined based on the difference DF″ from Yt.

Further, in the present embodiment, the pre-emission reflection brightness AVE is calculated using the pre-emission reflection image generated by subtracting the non-emission image from the pre-emission image. However, the brightness is calculated between the pre-emission image and the non-emission image. The pre-emission reflection brightness AVE may be calculated by subtracting the calculated brightnesses.

Further, in the present embodiment, the pre-emission reflection brightness AVE is calculated using the pre-emission reflection image generated by subtracting the non-emission image from the pre-emission image, but if the influence of the ambient light is ignored. The luminance calculated using the pre-emission image may be used as the pre-emission reflection luminance AVE.

Further, in the present embodiment, the main light emission amount is determined based on the image acquired by the AE sensor 107. However, at least a part of the image used for determining the main light emission amount including the image used for face detection has an imaging element. You may use the image acquired by 103.

Further, in the present embodiment, an example in which the main light emission amount of the strobe device 300 attached to the camera body 100 is determined, but the main light emission amount of the illumination device incorporated in the imaging device is determined according to the above determination method. You may.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist thereof.

100 camera body 101 CPU
102 memory 103 image sensor 107 photometric sensor 111 AF sensor 200 lens unit 201 LCPU
300 Strobe device 301 SCPU

Claims (19)

An imaging device capable of photographing using an illumination device,
Face detection means for performing face detection using an image acquired before pre-lighting the lighting device,
Luminance calculation means for calculating the reflection luminance corresponding to the reflection component of the pre-emission reflected by the subject when the illuminating device is pre-emitted,
A determining unit that determines whether or not the reflected brightness in a region corresponding to the face region detected by the face detecting unit, which is calculated by the brightness calculating unit, is within a predetermined brightness range;
Determining means for determining the amount of light emitted from the lighting device by increasing the weighting of the area in which the reflection luminance is determined to be within the predetermined luminance range by the determining means as compared with the weighting of other areas,
Have
The image pickup apparatus, wherein the determination unit changes the predetermined brightness range according to a state of the illumination device. The image pickup apparatus according to claim 1, wherein the determination unit changes the predetermined luminance range based on information about a state of the lighting device received from the lighting device. It said discriminating means includes a feature that in accordance with the rotation state with respect to the main body portion of the movable portion in the illumination device having a movable portion and a body portion having a light emission unit, changes the predetermined luminance range The imaging device according to claim 1 or 2. Said discriminating means, in accordance with the rotation state with respect to the main body portion of the movable portion in the illumination device having a movable portion and a body portion having a light emission portion, by changing the lower limit of the predetermined luminance range The image pickup apparatus according to claim 3, wherein: The determining means sets the lower limit value to a lower value when the movable portion is rotating with respect to the body portion than when the movable portion is in the normal position with respect to the body portion. The image pickup apparatus according to claim 4, wherein. Said discriminating means, in accordance with the rotation state with respect to the main body portion of the movable portion in the illumination device having a movable portion and a body portion having a light emission portion, by changing the upper limit value of the predetermined luminance range The image pickup apparatus according to claim 3, wherein the image pickup apparatus is an image pickup apparatus. The determining means sets the upper limit value to a lower value when the movable portion is rotating with respect to the body portion than when the movable portion is in the normal position with respect to the body portion. The image pickup apparatus according to claim 6, wherein. The discriminating means offsets the predetermined luminance range downward when the movable portion is rotating with respect to the body portion, rather than when the movable portion is in the normal position with respect to the body portion. The imaging device according to claim 3, wherein The discriminating means provides the lower limit value when the movable portion is in the normal position with respect to the main body portion, and does not provide the lower limit value when the movable portion is rotating with respect to the main body portion. The image pickup apparatus according to claim 4, wherein The image pickup apparatus according to claim 1, wherein the determination unit changes the predetermined luminance range according to whether or not the illumination device is used in a strobe multi-flash system. The image pickup apparatus according to claim 10, wherein the determination unit changes an upper limit value of the predetermined brightness range according to whether or not the illumination device is used in a strobe multi-flash system. 12. The determination means sets the upper limit value to a higher value when the lighting device is used in the strobe multi-flash system than when the lighting device is not used in the strobe multi-flash system. The imaging device according to. The image pickup apparatus according to claim 1, wherein the determination unit changes the predetermined luminance range according to whether or not the illumination device is equipped with an optical accessory. 14. The image pickup apparatus according to claim 13, wherein the determination unit changes the lower limit value of the predetermined brightness range according to whether or not the illumination device is equipped with an optical accessory. 15. The determination means sets the lower limit value to a lower value when the lighting device is equipped with an optical accessory than when the lighting device is not equipped with an optical accessory. The imaging device according to. The said discrimination|determination means changes the upper limit of the said predetermined|prescribed brightness|luminance range according to whether the said illuminating device is equipped with the optical accessory, The any one of Claim 13 thru|or 15 characterized by the above-mentioned. Imaging device. 17. The determination unit sets the upper limit value to a lower value when the lighting device is equipped with an optical accessory than when the lighting device is not equipped with an optical accessory. The imaging device according to. The discriminating means offsets the predetermined luminance range downward when the illumination device is equipped with an optical accessory rather than when the illumination device is not equipped with an optical accessory. Item 14. The imaging device according to item 13. A method for controlling an imaging device capable of shooting using an illumination device, comprising:
A face detection step of performing face detection using an image acquired before pre-lighting the lighting device;
A brightness calculation step of calculating a reflection brightness corresponding to a reflection component of pre-emission reflected by the subject when the illumination device is pre-emitted;
A determining step of determining whether or not the reflected brightness in the area corresponding to the face area detected in the face detecting step, which is calculated in the brightness calculating step, is within a predetermined brightness range;
A determination step of determining the light emission amount of the lighting device by increasing the weighting of the area determined to have the reflected luminance within the predetermined luminance range in the determination step as compared with the weighting of other areas,
The control method, wherein the determining step changes the predetermined brightness range according to a state of the lighting device.

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