JP4995133B2 - Imaging apparatus and control method - Google Patents

Description

The present invention relates to an imaging apparatus and a control how that can be taken by the flash.

  Conventionally, various techniques relating to flash emission control when performing flash photography with an imaging device (camera, digital still camera) have been proposed. Prior to the exposure operation, flash pre-emission (preliminary emission) is performed, and the reflected light of the subject by pre-emission is measured for each of the divided areas in the imaging screen (subject image observed by the viewfinder or display). This is a method for determining the main light emission amount. This is because an appropriate light emission amount can be determined for various shooting scenes by determining the main light emission amount by a predetermined algorithm based on the photometric results for each divided area.

  Regarding the above flash emission control, the following imaging method has been proposed so that an appropriate exposure amount can be obtained stably (see, for example, Patent Document 1). First, the ratio R (i) between the photometric value P (i) of each photometric area immediately before the pre-flash is emitted and the photometric value H (i) of each photometric area when the pre-flash is executed is measured by Calculate for each area. The largest R (i) obtained is extracted as the reference value baseR, and the reference value baseR is compared with the value of R (i) of each photometric area to obtain the weighting coefficient W (i) for each photometric area. decide. Next, the actual light emission amount is calculated based on the weighted average result obtained by weighted averaging of the reflected light amount at the time of pre-emission in each photometry area according to the weighting coefficient W (i).

Further, the following imaging method has been proposed in order to detect a human face region and obtain a good exposure even when the luminance of the subject is not sufficient (see, for example, Patent Document 2). First, it is detected whether or not a human face area exists in an image based on an image captured by pre-emission. Next, a light control area is determined according to the detected face area, and the main light emission amount is calculated according to a photometric value at the time of pre-emission in the determined light control area.
JP 2005-275265 A JP 2005-184508 A

  According to the technique described in Patent Document 1, a stable exposure can be obtained in many shooting scenes, and an imaging result with little change in exposure can be obtained even when the same shooting scene is shot with a slight composition change. It is done. However, as a rule of thumb, among the photometric areas, the largest R (i) satisfying the predetermined condition is regarded as the main subject area, and the reference value baseR is extracted from the amount of reflected light in that area. For this reason, the weighting coefficient W (i) tends to increase when it is present at a relatively short distance in the imaging screen or when the reflectance is high. Therefore, if the real main subject does not meet the predetermined condition, the exposure may not be as expected by the photographer.

  Further, according to the technique described in Patent Document 2, when the main subject is a person and the face of the person is reliably detected, the possibility of good exposure increases. However, when the resolution of the sensor that measures the reflected light during pre-emission is not sufficient for the size of the face area occupied on the imaging screen, the following problem occurs. Even if it is attempted to determine the main light emission amount using only the face area as the light control area, the influence of other areas such as the background of the person cannot be excluded and the exposure may not be good.

An object of the present invention is to provide a possibility as the imaging device and controls how that increase the probability of exposure as expected by the photographer.

In order to achieve the above-described object, an imaging apparatus according to the present invention is an imaging apparatus capable of photographing using a light emitting unit that emits light to a subject, and has a plurality of photometric areas, and each photometric area A photometric unit that performs photometry on the subject, an acquisition unit that acquires face information of the subject based on an image signal obtained by imaging, and a photometric unit that performs photometry when the light emitting unit is not emitting light. The ratio between the obtained first luminance value and the second luminance value obtained by photometry by the photometry means when the light emitting means is emitting is calculated for each photometry area of the plurality of photometry areas. Extraction for extracting a ratio value serving as a reference from the ratio between the first luminance value and the second luminance value in each photometric area calculated by the luminance ratio calculating means Means and the reference by the extracting means The target metering area for which to extract the value of that ratio, and setting means for setting, based on the face information acquired by the acquisition unit to a plurality of photometric areas including metering area other than the target metering area based on the result of comparing the value of the calculated ratio by the value before Symbol luminance ratio calculating means of the ratio to be the reference extracted by the extraction means, said target photometric obtained by photometry by the photometric means A weighting calculation means for performing weighting calculation of luminance values of a plurality of photometry areas including a photometry area other than the area, and a light emission amount calculation for calculating a main light emission amount of the light emitting means based on a result of the weighting calculation by the weighting calculation means And means.

According to the present invention, it becomes possible to increase the probability of exposure expected for shooting person.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a configuration diagram showing internal configurations of a camera body, an interchangeable lens, and a flash device as an imaging device according to a first embodiment of the present invention.

  In FIG. 1, the camera is a so-called single-lens reflex type capable of exchanging lenses, and an interchangeable lens 2 and a flash device 3 are detachably attached to the camera body 1. The camera body 1 includes a mechanical shutter (hereinafter referred to as shutter) 10, a low-pass filter 11, an image sensor 12, a main mirror 13, a first reflection mirror 14, a second reflection mirror 16, an infrared cut filter 17, and a diaphragm 18. Yes. The camera body 1 further includes a secondary imaging lens 19, a focus detection sensor 20, a focus plate 21, a pentaprism 22, an eyepiece lens 23, a third reflection mirror 24, a condenser lens 25, and a photometric sensor 26. ing.

  The image sensor 12 is composed of an area storage type photoelectric conversion element (for example, CMOS or CCD). The main mirror 13 is a semi-transmissive main mirror. Both the main mirror 13 and the first reflecting mirror 14 are flipped upward from the illustrated position by a drive mechanism (not shown) during photographing. The paraxial imaging plane 15 exemplifies an imaging plane conjugate with the imaging plane of the imaging device 12 by the first reflection mirror 14. The diaphragm 18 has two openings.

  The focus detection sensor 20 is composed of area-storage photoelectric conversion elements (for example, CMOS or CCD), and includes a light receiving sensor unit 20A and a light receiving sensor unit 20B arranged in two areas as shown in FIG. I have. The light receiving sensor unit 20A and the light receiving sensor unit 20B correspond to the two openings of the diaphragm 18, respectively, and are divided into a number of sections. In addition to the light receiving sensor unit 20A and the light receiving sensor unit 20B, the focus detection sensor 20 includes a signal storage unit, a signal processing peripheral circuit, and the like as an integrated circuit on the same chip.

  The configuration from the first reflecting mirror 14 to the focus detection sensor 20 is an image shift method at an arbitrary position in the imaging screen, as described in detail in, for example, Japanese Patent Application Laid-Open No. 9-184965. This makes it possible to detect the focus.

The photometric sensor 26 is composed of a photoelectric conversion element such as a silicon photodiode, for example, and is a sensor for obtaining information related to the luminance of the subject. The photometric sensor 26 includes a light receiving sensor unit 26A divided into a plurality of grids as shown in FIG. In this embodiment, the light receiving sensor section 26A is divided into 35 columns of 7 columns × 5 rows in the light receiving field. The light receiving parts divided into 35 are denoted as PD1 to PD35. In the photometric sensor 26, in addition to the light receiving sensor portion 26A, a signal amplifying portion, a peripheral circuit for signal processing, and the like are built as an integrated circuit on the same chip.

  The focus plate 21, the pentaprism 22, and the eyepiece lens 23 constitute a finder optical system. Of the light beam reflected by the main mirror 13 and diffused by the focus plate 21, a part outside the optical axis is incident on the photometric sensor 26.

  FIG. 4 is a diagram illustrating a corresponding positional relationship between the focus detection position in the imaging screen by the focus detection sensor 20 and the 35 photometric sensors 26 divided into 35 parts. In the present embodiment, focus detection is performed at, for example, three focus detection positions S0 to S2 in the imaging screen. The focus detection position S0 corresponds to the light receiving unit PD18 of the photometric sensor 26. The focus detection position S1 corresponds to the light receiving unit PD16 of the photometric sensor 26. The focus detection position S2 corresponds to the light receiving unit PD20 of the photometric sensor 26. The number of divisions 35 of the light receiving sensor unit 26A in the photometric sensor 26 and the three focus detection positions S0 to S2 are merely examples, and the present invention is not limited thereto.

  Returning to the description of FIG. In the camera body 1, the mount portion 27 is a member for attaching the interchangeable lens 2 to the camera body 1. The contact portion 28 is used for information communication between the camera body 1 and the interchangeable lens 2. The connection portion 29 is a member for attaching the flash device 3 to the camera body 1.

  The interchangeable lens 2 includes optical lenses 30 a to 30 e constituting a photographing lens, a diaphragm 31, a contact portion 32 for performing information communication with the camera body 1, and a mount portion 33 for attaching the interchangeable lens 2 to the camera body 1. Yes. The flash device 3 includes a light emitting unit (xenon tube in this example) 34, a reflective shade 35, a condensing Fresnel lens 36, a light emission amount sensor (monitor sensor) 37 that detects the light emission amount of the light emitting unit 34, and the flash device 3. An attachment portion 38 for attaching to the camera body 1 is provided.

  FIG. 5 is a block diagram illustrating a configuration example of an electric circuit of the camera body, the interchangeable lens, and the flash device.

  In FIG. 5, the camera body 1 further includes a control unit 41, a shutter drive unit 42, a signal processing circuit 43, a storage unit 44, a first motor driver 45, a first motor 46, a display 47, a release switch 48, A live view start switch 49 and a storage unit 50 are provided.

The control unit 4 1 controls the entire camera. The control unit 41 is composed of a one-chip microcomputer incorporating an A / D converter 41a, a timer 41b, an arithmetic logic unit (ALU) 41c, a ROM 41d, a RAM 41e, a serial communication port (SPI) 41f, and the like. Further, the control unit 41 executes the processes shown in the flowcharts of FIGS. 6a, 6b, and 7 based on the program stored in the ROM 41d. The ROM 41d stores a later-described LVL0 determination table (FIG. 8) and a W (i) value determination table (FIG. 10).

  The shutter 10, the image sensor 12, the focus detection sensor 20, and the photometry sensor 26 are the same as those illustrated in FIG. Output signals of the focus detection sensor 20 and the photometry sensor 26 are input to the input terminal of the A / D converter 41a of the control unit 41. The shutter drive unit 42 is connected to the output terminal of the control unit 41 and drives the shutter 10.

The signal processing circuit 4 3 controls the imaging device 12 according to an instruction of the control section 41 performs signal processing an image signal output from the imaging device 12 to input while converting A / D, to obtain an image signal. Further, the signal processing circuit 43 extracts features such as the eyes and mouth of the subject (human) from the obtained image signal to detect a human face and obtain face information (face position information and face size information) as face information. It also has a function. Further, the signal processing circuit 43 performs necessary image processing such as compression when recording the obtained image signal in the storage unit 50.

  The storage unit 44 is configured as a DRAM, for example, and is used as a work memory when the signal processing circuit 43 performs various signal processing or as a VRAM when displaying an image on the display unit 47. . The first motor driver 45 is connected to the output terminal of the control unit 41, and based on the control of the control unit 41, the main mirror 13 and the first reflection mirror 14 are up / down, and the shutter 10 is charged (shutter 10 To return to the initial position. The display 47 is composed of a liquid crystal panel, and displays various captured images and the like when the lighting is controlled by the control unit 41.

  The release switch 48 is operated by an operator at the time of shooting. The live view start switch 49 is operated when starting a live view function (a function for performing composition confirmation and focusing while displaying a through image captured by the image sensor 12 on the display 47 in real time). The storage unit 50 is configured as a flash memory or an optical disc, for example, and stores captured image signals.

  The contact portion 28 is in contact with the contact portion 32 of the interchangeable lens 2 and is connected with an input / output signal via the serial communication port 41 f of the control portion 41. Thereby, information communication between the camera body 1 and the interchangeable lens 2 is possible. The connection unit 29 is connected to the connection unit 38 of the flash device 3 and is connected to an input / output signal via the serial communication port 41 f of the control unit 41. Thereby, information communication between the camera body 1 and the flash device 3 is possible.

  The interchangeable lens 2 further includes a lens control unit 51, a second motor driver 52, a second motor 53, a third motor driver 54, a third motor 55, a distance encoder 56, and a zoom encoder 57. The lens control unit 51 includes a one-chip microcomputer incorporating a serial communication port (SPI) 51a, an arithmetic logic unit (ALU) 51b, a ROM 51c, a RAM 51d, a timer 51e, and the like.

  The second motor driver 52 is connected to the output terminal of the lens control unit 51 and drives the second motor 53 for performing focus adjustment based on the control of the lens control unit 51. The third motor driver 54 is connected to the output terminal of the lens control unit 51, and drives a third motor 55 for controlling the diaphragm 31 based on the control of the lens control unit 51.

  The distance encoder 56 is connected to the input terminal of the lens control unit 51, and measures the amount of extension of the focus adjustment lens in the interchangeable lens 2, that is, information on the subject distance. The zoom encoder 57 is connected to the input terminal of the lens control unit 51 and measures focal length information at the time of shooting when the interchangeable lens 2 is a zoom lens. The contact unit 32 is connected to an input / output signal via the serial communication port 51 a of the lens control unit 51.

  When the interchangeable lens 2 is attached to the camera body 1, the respective contact portions 32 and the contact portions 28 are connected. As a result, the lens control portion 51 of the interchangeable lens 2 performs data communication with the control portion 41 of the camera body 1. Is possible. Information required by the control unit 41 of the camera body 1 is output from the lens control unit 51 to the control unit 41 by data communication. The information includes optical information unique to the lens necessary for focus detection and exposure calculation, information on the subject distance measured by the distance encoder 56, and focal length information measured by the zoom encoder 57.

  Information processed by the control unit 41 of the camera body 1 is output from the control unit 41 to the lens control unit 51 by data communication. The information includes focus adjustment information and aperture information obtained as a result of the focus detection and exposure calculation performed by the control unit 41. The lens control unit 51 controls the second motor driver 52 according to the focus adjustment information output from the control unit 41 of the camera body 1 and controls the third motor driver 54 according to the aperture information.

  The flash device 3 further includes a flash controller 61 and a booster 62. The light emitting unit 34 and the light emission amount sensor 37 are the same as those illustrated in FIG. The flash control unit 61 is composed of a one-chip microcomputer incorporating an arithmetic logic unit (ALU), ROM, RAM, A / D converter, serial communication port (SPI) (not shown) and the like. The step-up unit 62 has a function of generating a high voltage of about 300 V necessary for light emission of the light emitting unit 34 and charging the high voltage.

  When the flash device 3 is attached to the camera body 1, the respective connection units 38 and 29 are connected. As a result, the flash control unit 61 of the flash device 3 performs data communication with the control unit 41 of the camera body 1. Is possible. The flash control unit 61 controls the boosting unit 62 according to the communication content from the control unit 41 of the camera body 1 to start / stop the light emission of the light emitting unit 34, and the detected amount of the light emission amount sensor 37 is set to the camera body 1. To the control unit 41.

  Next, the operation of the camera of the present embodiment having the above configuration will be described with reference to FIGS.

  6a and 6b are flowcharts showing a specific operation sequence related to the present invention in the camera.

  6a and 6b, when a power switch (not shown) of the camera is turned on by the operator, the control unit 41 of the camera body 1 becomes operable and this processing is started.

  In step S101, the control unit 41 communicates with the flash control unit 61 of the flash device 3, operates the boosting unit 62, and performs charging to generate a high voltage sufficient for light emission of the light emitting unit 34 (flash). To instruct.

  In step S102, the control unit 41 communicates with the lens control unit 51 of the interchangeable lens 2 to obtain information on various lenses constituting the interchangeable lens 2 necessary for distance measurement and photometry.

  In step S103, the control unit 41 checks whether the live view start switch (LVSW) 49 is turned on by the operator. If the live view start switch 49 is not turned on, the process proceeds to step S104.

  Next, in step S104, the control unit 41 detects face position information indicating the coordinates of the face position of the human subject on the imaging screen stored in the RAM 41e during the previous shooting, and a face size indicating the face size of the human subject. Clear information. The reason is that the face position information and the face size information are effective information when the live view start switch 49 is turned on and the live view operation is started, but otherwise, there is no meaning.

  Next, in step S <b> 105, the control unit 41 outputs a control signal to the focus detection sensor 20, and accumulates signals in the signal accumulation unit associated with focus detection in the focus detection sensor 20. When the signal accumulation is completed, the control unit 41 performs A / D conversion while reading the signal accumulated in the signal accumulation unit of the focus detection sensor 20. Furthermore, the control unit 41 performs various necessary data corrections such as shading correction on each A / D converted digital data.

  In step S106, the control unit 41 inputs lens information and the like necessary for focus detection from the lens control unit 51, and performs imaging based on the lens information and digital data obtained from the focus detection sensor 20. The focus state of each part of the screen is calculated. Further, the control unit 41 determines a region to be focused in the imaging screen from the focus detection positions S0 to S2 (FIG. 4). If there is an area designated in advance by an operator using an operation member or the like, the area may be followed. The control unit 41 calculates a lens movement amount for focusing according to the focus state in the determined area, and outputs the calculated lens movement amount to the lens control unit 51.

  The lens control unit 51 drives the second motor 53 by outputting a drive signal to the second motor driver 52 so as to drive the focus adjustment lens according to the lens movement amount. As a result, the photographing lens is brought into focus with respect to the subject. Since the information measured by the distance encoder 56 is changed by driving the focus adjustment lens, information on various lenses is also updated.

  Next, in step S107, the control unit 41 performs A / D conversion while reading the signals of the light receiving units PD1 to PD35 (FIG. 3) divided into 35 from the photometric sensor 26, and inputs luminance information of each part of the imaging screen. To do. Further, the control unit 41 inputs necessary lens information and the like from the lens control unit 51, corrects luminance information of each part of the imaging screen, and obtains subject luminance information for each light receiving unit of the photometric sensor 26.

  Next, in step S108, the control unit 41 uses the obtained subject luminance information for each light receiving unit of the photometric sensor 26 to determine each light receiving unit of the photometric sensor 26 corresponding to the focus detection portion by the focus detection sensor 20. The brightness of the entire imaging screen is calculated by weighting the brightness information. Based on the luminance information of the entire imaging screen calculated in this way, the control unit 41 determines the charge accumulation time (that is, shutter speed) and aperture value of the imaging device 12 suitable for imaging from a prescribed program diagram (not shown). It is determined and displayed on the display 47. When one of the shutter speed and the aperture value is preset in advance, the other factor that provides good exposure is determined in combination with the preset value.

  The exposure value based on the apex value between the determined shutter speed and aperture value is referred to as EVT. The exposure value EVT is expressed by the following formula.

EVT = Tv + Av
Here, Tv is the apex value of the shutter speed, and Av is the apex value of the aperture value.

  Next, in step S109, the control unit 41 waits for the release switch 48 to be turned on by the operator. If the release switch 48 is not turned on, the process returns to step S102. If the release switch 48 is turned on, the process proceeds to step S117.

  On the other hand, if the live view start switch 49 is turned on in step S103, the process proceeds to step S110. In step S <b> 110, the control unit 41 drives the first motor 46 by outputting a control signal to the first motor driver 45, and flips the main mirror 13 and the first reflection mirror 14 upward.

  Next, in step S111, the control unit 41 outputs a control signal to the shutter drive unit 42 to open the shutter 10. As a result, a light beam from the photographing lens is incident on the image sensor 12 and imaging is possible. Subsequently, the control unit 41 instructs the signal processing circuit 43 to perform an imaging operation with the imaging element 12. When the imaging operation is started, the control unit 41 performs control so that the obtained captured image is displayed on the display unit 47. Thus, the live view operation is started.

  Next, in step S112, the control unit 41 performs exposure (AE) control and white balance (WB) from the captured image data so that the brightness and color of the live view image displayed on the display device 47 are appropriate. ) Get control data. Further, the control unit 41 corrects the charge accumulation time and color processing of the image sensor 12 based on the obtained data. An exposure value EVT at the time of actual imaging is also calculated from the exposure control data. Exposure control data such as shutter speed and aperture value is calculated as necessary in the same manner as in step S108.

  Next, in step S <b> 113, the control unit 41 performs face detection processing from the captured image by the signal processing circuit 43. In face detection processing, as described in Japanese Patent Application Laid-Open No. 2005-184508, feature edges of eyes and mouth are extracted from image data to detect the position of a person's face and further include eyes and mouth. The contour is detected, the position of the center of gravity is obtained, and the luminance of the region in the contour is calculated. Further, face position information in the imaging screen is obtained based on the calculated barycentric position, and face size information is obtained from the contour information.

  Next, in step S114, the control unit 41 obtains the face position information and face size information obtained by the signal processing circuit 43, and stores them in the RAM 41e. The face position information may be x-coordinate and y-coordinate with the origin at a predetermined point such as the center or the upper left corner in the imaging screen. The face size information may be data indicating the radius of a circle centered on the face position information or length data of one side of the square as data indicating the range in which the face area extends.

  Next, in step S115, the control unit 41 waits for the release switch 48 to be turned on by the operator. If the release switch 48 is not turned on, the process returns to step S112, and the processes of steps S112 to S114 are repeated. If the release switch 48 is on, the process proceeds to step S116.

  Next, in step S116, the control unit 41 outputs a control signal to the shutter drive unit 42, thereby closing the shutter 10 and ending the live view operation. Subsequently, the control unit 41 drives the first motor 46 by outputting a control signal to the first motor driver 45, and once lowers the main mirror 13 and the first reflecting mirror 14 from the flip-up state. The shutter 10 is charged.

  Next, in step S117, the control unit 41 performs A / D conversion while reading the signals of the light receiving units PD1 to PD35 divided into 35 from the photometric sensor 26, and immediately before pre-emission (preliminary emission) of each part of the imaging screen. Enter brightness information. Here, the luminance information (luminance value) immediately before the pre-emission for each light receiving unit of the photometric sensor 26 is referred to as P (i). Subsequently, the control unit 41 communicates with the flash control unit 61 to instruct pre-emission of the light emitting unit 34 (flash).

  Accordingly, the flash control unit 61 causes the light emitting unit 34 to emit light based on the output signal of the light emission amount sensor 37 so that the light emitting unit 34 emits light for a preset pre-emission amount. In order to obtain the luminance information of the subject during the pre-emission, the control unit 41 performs A / D conversion while reading the signals of the light receiving units PD1 to PD35 divided into 35 from the photometric sensor 26. The luminance information at the time of pre-emission of each part of the imaging screen is input. Here, luminance information (luminance value) at the time of pre-emission for each light receiving unit of the photometric sensor 26 is referred to as H (i). Here, i is 1 to 35 corresponding to each of the 35 light receiving portions.

  Next, in step S118, the control unit 41 performs a calculation to determine the main light emission amount (main light emission gain) of the light emitting unit 34 (flash). Specific calculation processing will be described later with reference to the flowchart of FIG.

  Next, in step S119, the control unit 41 drives the first motor 46 by outputting a control signal to the first motor driver 45, and flips the main mirror 13 and the first reflection mirror 14 upward. Subsequently, the control unit 41 outputs the aperture value information calculated in step S <b> 107 to the lens control unit 51 of the interchangeable lens 2.

  The lens control unit 51 drives the third motor 55 by outputting a control signal to the third motor driver 54 so as to drive the diaphragm 31 according to the diaphragm value information. As a result, the photographing lens is brought into a narrowed state.

  In step S120, the control unit 41 outputs a control signal to the shutter driving unit 42 to open the shutter 10. As a result, a light beam from the photographing lens is incident on the image sensor 12 and imaging is possible. Subsequently, the control unit 41 instructs the signal processing circuit 43 to set the charge accumulation time of the image sensor 12 according to the shutter time calculated in step S <b> 107 and perform imaging by the image sensor 12. . In addition, the control unit 41 gives a light emission instruction of the light emitting unit 34 (flash) to the flash control unit 61 of the flash device 3 in synchronization with the imaging timing.

  The flash control unit 61 emits the light emitting unit 34 based on the output signal of the light emission amount sensor 37 so that the light emission amount corresponds to the main light emission amount (main light emission gain) calculated in step S118 according to the light emission instruction. Let Thereby, imaging with flash emission is performed. When the imaging is completed, the control unit 41 outputs a control signal to the shutter drive unit 42 to place the shutter 10 in a light-shielding state. Thereby, the light beam from the photographing lens with respect to the image sensor 12 is blocked.

  Next, in step S <b> 121, the control unit 41 outputs information to the lens control unit 51 of the interchangeable lens 2 so as to open the diaphragm 31. The lens control unit 51 drives the third motor 55 by outputting a control signal to the third motor driver 54 so as to drive the diaphragm 31 according to this information. As a result, the photographing lens is in a fully open state. Furthermore, the control unit 41 drives the first motor 46 by outputting a control signal to the first motor driver 45, and lowers the main mirror 13 and the first reflection mirror 14.

  Next, in step S122, the control unit 41 reads the captured image information from the image sensor 12 while performing A / D conversion, and instructs the signal processing circuit 43 to perform necessary correction processing and interpolation processing.

  Next, in step S123, the control unit 41 instructs the signal processing circuit 43 to perform white balance adjustment on the captured image information. Specifically, in the captured image information, one screen is divided into a plurality of areas, and the white area of the subject is extracted from the color difference signal for each area. Further, the white balance adjustment is performed by correcting the gain of the red channel and the blue channel of the entire imaging screen based on the extracted white region signal.

  In step S <b> 124, the control unit 41 instructs the signal processing circuit 43 to compress and convert the captured image information subjected to white balance adjustment into a recording file format and store it in the storage unit 44. In steps S101 to S124, a series of shooting sequences is completed.

  Next, calculation processing for determining the main light emission amount (main light emission gain) of the light emitting unit 34 (flash) performed in step S118 of FIG. 6B will be described with reference to the flowchart of FIG.

  FIG. 7 is a flowchart showing details of a calculation process for determining the main light emission amount (main light emission gain) of the light emitting unit.

  In FIG. 7, in step S151, the control unit 41 calculates the luminance value P (i) immediately before the pre-emission and the luminance value H (i) at the time of the pre-emission for each photometric area (photometric area) of the photometry sensor 26. Then, a luminance value (subject reflected light amount) D (i) for only the reflected light during pre-emission is calculated. Since the luminance value P (i) immediately before the pre-light emission and the luminance value H (i) at the time of the pre-light emission are values in the compression system, respectively, P (i) and H (i) The power is expanded by taking the power, and then the difference is taken and the difference value is logarithmically compressed.

D (i) = log ₂ (2 ^{H (i)} −2 ^{P (i)} )
Here, i is 1 to 35 corresponding to each light receiving portion (photometric area) of the photometric sensor 26 divided into 35.

  Next, in step S152, the control unit 41 uses the luminance value P (i) immediately before the pre-light emission and the luminance value H (i) at the time of the pre-light emission for each photometry area of the photometry sensor 26 as shown in the following equation. The luminance value ratio R (i) is calculated.

R (i) = H (i) -P (i)
Since the luminance value P (i) immediately before the pre-emission and the luminance value H (i) at the time of the pre-emission are values in the compression system, taking this difference is equivalent to taking the ratio of the luminance values. .

  The reason for obtaining the ratio of the luminance values is that, as described in Japanese Patent Application Laid-Open No. 2005-275265, the photometric area in which the ratio of the luminance values matches in each photometric area of the photometric sensor 26 divided into 35 is the subject. This is because it can be regarded as a photometric area with the same distance.

  Next, in step S153, the control unit 41 calculates predetermined values LVL0 and LVL1 from the information regarding the distance of the subject as shown by the following equation. LVL0 is obtained from the information of the distance encoder 56 (distance information D related to the object distance to the subject) obtained from the lens control unit 51 in step S102 or step S106 and the information C2 related to the amount of emitted light during pre-emission. Calculate as follows. That is, the calculation is performed in consideration of the reflection luminance in the case of a subject having a standard reflectance at the distance.

  LVL0 is determined to be slightly higher than the reflection luminance of the subject having the standard reflectance in the distance information D. In consideration of the fact that the distance information D actually has some errors, LVL0 is increased by an amount corresponding to the error, and the reflected light at the time of pre-emission in the subject having the actual standard reflectance is LVL0. This is to prevent the height from becoming higher.

LVL0 = −log ₂ (D) × 2 + C2
On the other hand, LVL1 is determined by subtracting C3 from LVL0. C3 is determined in consideration of an error of the distance information D and the like so that the reflected light at the time of pre-emission of the subject having an actual standard reflectance does not fall below LVL1.

LVL1 = LVL0-C3
As described above, the following calculation for determining the flash main light emission amount is performed on the assumption that the reflected light during the pre-emission of the subject normally falls between the predetermined values LVL0 and LVL1 from the distance information D.

  In the case of a single-lens reflex camera with interchangeable lenses, the distance information D may not be obtained because the distance encoder 56 is not provided depending on the lens attached to the camera body. Here, a calculation method of the predetermined values LVL0 and LVL1 in that case will be described.

  First, LVL0 is determined with reference to the LVL0 determination table (table1) shown in FIG. 8 based on the focal length information of the taking lens.

LVL0 = table1 (f)
The LVL0 determination table is a table showing the correspondence between the focal length (f) of the photographic lens and LVL0.

  For example, if the focal length (f) of the photographic lens is 28 mm (f <40 mm), the reflection luminance (standard reflected light at 0.5 m) when a subject having a standard reflectance is located at a distance of 0.5 m. LVL0. In general, when photographing using a photographing lens having a focal length of 28 mm, the frequency of photographing a subject at a short distance of 0.5 m is extremely low. Becomes lower than LVL0.

  Similarly, the LVL0 determination table in FIG. 8 is configured based on the idea that the reflection luminance is LVL0 when an object with a standard reflectance is located at a distance of 0.8 m in the case of a photographing lens with a focal length of 50 mm. Has been. Since it is more reasonable to divide the focal length of the photographic lens in a certain amount of steps, the focal length is divided as such in the LVL0 determination table.

  On the other hand, LVL1 when distance information D is not obtained is calculated by subtracting C1 from LVL0. As a rule of thumb, C1 is determined so that the amount of pre-reflected light from the subject does not fall below LVL1. For example, when flash photography is performed with a photographing lens having a focal length of 50 mm, if the probability of photographing farther than 6.4 m from the subject is extremely low, the subject is compared to the case where the distance is 0.8 m when determining LVL0. Since the reflected light from the light source is 6 steps lower, C1 is set to 6.

LVL1 = LVL0-C1
Both LVL0 and LVL1 are values in the compression system.

  In step S154, the control unit 41 checks whether face position information and face size information are available from the signal processing circuit 43. When the live view operation is started and step S114 is executed, face position information and face size information are available. If not, the face position information and the face size information are cleared in step S114, so that the face position information and the face size information are not available. If face position information and face size information are not available, the process proceeds to step S155.

  Next, in step S155, the control unit 41 sets a coefficient K (i) that limits an option area for selecting a reference value BaseR, which will be described later, to a specified default value. The coefficient K (i) is set for each of the 35 photometric areas divided by the photometric sensor 26 as shown in FIG. The specified default values are K (1) to K (8), K (14), K (15), K (21), K (22), K (28) as shown in FIG. , K (29), K (35) are 0, and the other values are 1.

  On the other hand, if face position information and face size information are available in step S154, the process proceeds to step S156. In step S156, the control unit 41 changes or sets a coefficient K (i) for limiting an option area for selecting the reference value BaseR from a specified default value according to face position information.

  For example, when a human face exists near the center of the imaging screen as shown in FIG. 9C from the face position information, the coefficient K (i) remains at the default value. As shown in FIG. 9D from the face position information, when a person's face exists at a position close to the left end of the imaging screen, the coefficient K (i) is K (8), K (15) Four values of K (22) and K (29) are changed from 0 to 1.

  Although not shown, similarly, when a human face is present at a position near the right end of the imaging screen from the face position information, the coefficient K (i) is K (14) with respect to a specified default value. The values at four locations K (21), K (28), and K (35) are changed from 0 to 1. When a person's face is present at a position close to the upper part of the imaging screen from the face position information, the coefficient K (i) has five values K (2) to K (6) with respect to the specified default value. Change from 0 to 1.

  That is, the control unit 41 obtains the coefficient for limiting the photometric area to be extracted when extracting the reference value BaseR (reference ratio value), the face position information / face size information obtained by the signal processing circuit 43. Set according to (Face Information).

  As shown in FIG. 9F, when the face size information shows a considerably large value and almost the entire area of the imaging screen is a person's face, the coefficient K ( Even if the value of i) is changed, the calculation result of the actual light emission amount has no significant meaning. This is because, as a result, the face area covers many sensor portions in the photometry area of the photometry sensor 26 near the center of the imaging screen. Therefore, when the face size information is larger than a predetermined value, the coefficient K (i) may be kept at the default value shown in FIG.

  Next, in step S157, the control unit 41 sets the luminance value D (i) to the predetermined value LVL0 from the photometric areas in which the coefficient K (i) is 1 in the 35 photometric areas divided by the photometric sensor 26. And an area between LVL1 and LVL1 are extracted. Accordingly, the luminance value D (i) is abnormally high due to specular reflection from a specular object such as glass, or the luminance value D (i) is so far away that the flash light of the light emitting unit 34 does not reach. Photometric areas where i) is very low are excluded. As a result, a photometric area where the main subject is likely to exist is extracted.

  Note that the value of the luminance value H (i) at the time of pre-light emission is not much different from the value of the luminance value D (i) (because the luminance value P (i) immediately before the pre-light emission is often small), In step S157, the luminance value H (i) at the time of pre-emission may be used instead of the luminance value D (i).

  Since the extraction is performed only from the photometric area having the coefficient K (i) of 1, the main subject such as the upper end and the left and right ends of the imaging screen is normally arranged under the condition that K (i) remains at the specified default value. Metering areas that are not likely are also excluded from extraction targets. The photometric area in which the coefficient K (i) is changed from 0 to 1 according to the face position information is changed to an extraction candidate as an area where a main subject called a human face may exist.

  Next, in step S158, the control unit 41 selects the reference area as follows because the subject closest to the extracted photometric area is likely to be the main subject. That is, the luminance value P (i) (first luminance value) immediately before the pre-light emission (before the preliminary light emission operation) and the luminance value H (i) (second luminance) at the time of pre-light emission (during the preliminary light emission operation). The photometric area where the ratio R (i) to the luminance value is the maximum value is selected as the reference area. The value of R (i) in the reference area is referred to as a reference value BaseR (reference ratio value), and a photometric area in which the values of the reference values BaseR and R (i) indicate the same value is referred to as a main subject area. To do.

  Next, in step S159, the control unit 41 determines the difference RR () between the ratio R (i) of the luminance value and the reference value BaseR as shown in the following formula in all photometric areas of i = 1 to 35 in the photometric sensor 26. i) is calculated.

RR (i) = baseR−R (i)
Since both the luminance value ratio R (i) and the reference value BaseR are values in the compression system, RR (i) calculates the ratio of R (i) in the reference area and R (i) in the other photometric areas. Will be. The photometric area in which the value of RR (i) is small is a photometric area in which the subject exists at a distance approximately equivalent to the subject in the photometric area that is assumed to be the main subject area and has the reference value BaseR.

  On the other hand, the photometric area where the value of RR (i) increases in the positive direction is assumed to be the main subject area, and there is a subject that is farther away than the subject in the photometric area that has the reference value BaseR. This is a photometric area that can be regarded as Conversely, the photometric area in which the value of RR (i) increases in the negative direction is a photometric area that is assumed to be the main subject area and can be regarded as being closer to the subject in the photometric area having the reference value BaseR. is there.

  That is, such a photometric area is considered to be a photometric area in which an object has an obstacle in front of it other than the main subject, or a photometric area in which specular reflection by a mirror surface such as glass occurs and an abnormally high amount of reflected light is obtained. It is done.

  Next, in step S160, the control unit 41 determines the weighting coefficient W (i) according to RR (i) calculated in all photometry areas of i = 1 to 35 in the photometry sensor 26. Specifically, W (i) is obtained from the value of RR (i) in each photometric area with reference to the W (i) value determination table (table2) shown in FIG.

W (i) = table2 (RR (i))
The W (i) value determination table is a table showing the correspondence between RR (i) and W (i).

  According to the W (i) value determination table, the photometric area in which the value of RR (i) becomes the reference value BaseR is given the maximum value 12 on weighting as W (i). A photometric area in which the value of RR (i) is the same as or very close to the reference value BaseR is given a higher value for W (i). This is because such a region is regarded as a main subject region or a subject having substantially the same distance as the main subject. As the absolute value of the RR (i) value increases from 0, the weighting coefficient W (i) given to the photometric area gradually decreases. This is because there is a high possibility that the subject area is different from the subject in the photometry area assumed to be the main subject.

  In this way, the main light emission amount calculation is performed in the subsequent steps by giving a weighting coefficient according to the distance to the subject existing in each photometric area. As a result, even when the main subject position in the imaging screen is moved every time shooting is performed, or when the same scene is shot with a slightly different composition, the same amount of main light emission can be calculated. It is possible to prevent different exposure results from being obtained.

  Note that the value of RR (i) is close to the reference value BaseR even in the photometric area where the value of K (i) is set to 0 and the reference value BaseR is not selected in step S155 or step S156. If it is a value, a large weighting coefficient W (i) is given. This point of the present embodiment is a method for detecting a face area as described in Japanese Patent Laid-Open No. 2005-184508, and setting the detected face area as a dimming area and calculating a main light emission amount. Is different.

  Next, in step S161, the control unit 41 performs a weighting calculation of the reflected light of the subject in all photometry areas of i = 1 to 35 in the photometry sensor 26 as shown by the following equation.

AVE = Σ (D (i) × W (i)) / ΣW (i)
By this weighting calculation, the average value AVE of the reflected light of the entire imaging screen in which the weighting is larger in the photometric area that is assumed to be the subject having the same distance as the photometric area regarded as the main subject area is calculated.

  Next, in step S162, the control unit 41 emits the main light emission from the exposure value EVT based on the apex value between the shutter speed and the aperture value determined in step S108 or step S112 and the AVE calculated in step S161. The amount G is calculated.

G = EVT-AVE
That is, the control unit 41 determines the reference value BaseR (reference ratio value) extracted according to the coefficient, the luminance value immediately before the pre-light emission and the luminance value at the time of the pre-light emission in each photometric area of the photometric sensor 26. And the light emission amount of the light emitting unit 34 during the exposure operation is calculated based on the comparison result.

  The light emission amount G of the main light emission is a relative value of the main light emission with respect to the flash light emission amount at the time of the pre-light emission. The value of the light emission amount G is transmitted from the control unit 41 of the camera body 1 to the flash control unit 61 of the flash device 3 by communication. Thereby, desired flash imaging is performed by performing the main light emission with the light emission amount according to the light emission amount G in step S120.

[Second Embodiment]
The second embodiment of the present invention differs from the first embodiment in the following points. Since the other elements of the present embodiment are the same as the corresponding ones of the first embodiment (FIGS. 1 to 5), description thereof will be omitted.

  In the first embodiment, the coefficient K (i) for limiting the option area for selecting the reference value BaseR is shown in FIG. 9B when the face position information and face size information are not available. Set to the default value shown. In addition, when face position information and face size information are available, some of the default values are changed. In contrast, in the present embodiment, the following settings are made.

  FIG. 11A to FIG. 11E are diagrams showing examples of setting combination tables of coefficients K (i) that limit option areas for selecting the reference value BaseR according to the present embodiment.

11 (a) to 11 (e), the coefficient K (i) is K (1) to K (8), K (14), K (15), K in the table of FIG. 11 (a). Each value of (21), K (22), K (28), K (29), K (35) is 0, and each other value is 1. The coefficient K (i) is K (1) to K (7), K (13), K (14), K (20), K (21), K (27) in the table of FIG. , K (28), K (34), K (35) are 0, and the other values are 1.

The coefficient K (i) is K (1) to K (9), K (15), K (16), K (22), K (23), K (29) in the table of FIG. , K (30) is 0, and all other values are 1. The coefficient K (i) is K (1), K (7), K (8), K (14), K (15), K (21), K (22) in the table of FIG. , K (28) to K (35) are 0, and the other values are 1. In the table of FIG. 11E, the coefficient K (i) is 0 for each value of K (1), K (7), K (29), K (35), and 1 for the other values. is there.

  In the setting combination table (coefficient value table) of the five types of coefficients K (i) described above, coefficients that limit the photometric area (photometric area) are set in advance for each photometric area (each photometric area). The control unit 41 selects a suitable coefficient from the set combination table of the five types of coefficients K (i) based on face information (face position information and face size information).

Since the face position information and the face size information are cleared in step S155 of FIG. 7, the table of FIG. 11A which is a standard K (i) value table is selected. In step S156, if the input face position information is information indicating the left end of the imaging screen, the table in FIG. 11B is selected. If the input face position information is information indicating the right end of the imaging screen, the table in FIG. 11C is selected.

If the input face position information is information indicating the upper end of the imaging screen, the table in FIG. 11D is selected. If the input face position information is information indicating the vicinity of the center of the imaging screen or the bottom of the imaging screen, the table of FIG. 11A is selected. If the input face size information is larger than a predetermined value, the table shown in FIG. 11E is selected regardless of the face position information. All other configurations and flowcharts can be applied to those described in the first embodiment.

  Note that the number of setting combination tables for the coefficient K (i) is set to 5 as an example, and the present invention is not limited to this. It is also possible to adopt a configuration in which options are switched in a matrix manner by a combination of face position information and face size information.

  As described above, according to the first and second embodiments, various effects can be achieved by performing the following control. The control unit 41 of the camera body 1 instructs a pre-light emission (preliminary light emission) operation of the light emitting unit 34 of the flash device 3 toward the subject prior to the exposure operation. At each of the first timing immediately before the pre-light emission and the second timing during the pre-light emission operation, the photometric sensor 26 measures the subject luminance in the plurality of photometry areas. Further, the control unit 41 inputs face information (face position information, face size information) of a person from the signal processing circuit 43 prior to the exposure operation.

  The control unit 41 uses the first photometric information (luminance value immediately before the pre-emission) P (i) measured at the first timing and the second photometric information (the luminance during the pre-emission operation) measured at the second timing. Value) Ratio R (i) with H (i) is calculated for each photometric area. Next, the control unit 41 extracts a reference BaseR (reference ratio value) from the ratio R (i) in each photometric area.

  Next, the control unit 41 sets a coefficient K (i) that limits a photometric area that is symmetrically extracted when extracting the reference BaseR according to the face information of the person. Next, the control unit 41 compares the reference BaseR with the ratio value R (i) of each photometric area according to the value of the coefficient K (i), and the flash device during the exposure operation based on the comparison result. The light emission amount of the three light emitting units 34 is calculated.

  As described above, appropriate limitation is applied to the photometric area from which the reference value BaseR is extracted (the photometric area) depending on whether the main subject (person's face) is near the center of the imaging screen or near the periphery of the imaging screen. Narrow down). This makes it possible to further increase the probability that the exposure will be as expected by the photographer.

  In any of the configuration examples described in the first and second embodiments, a coefficient that limits an option area (photometric area) for selecting the reference value BaseR in a shooting situation where face position information is not available K (i) is set as follows. That is, the coefficient K (i) is set to 0 in the peripheral area of the imaging screen where the probability of the presence of the main subject is usually very low as shown in FIG. 9B or 11A.

  Therefore, it is possible to reduce the possibility that the flash emission level becomes inappropriate because an area where an object that has entered the periphery of the imaging screen is not related to the shooting intention is selected as the reference value BaseR area. Become. As a result, the accuracy of extracting the main subject area intended by the photographer, that is, the probability of the exposure as expected by the photographer can be further increased.

  On the other hand, in a shooting situation in which face position information is available, the coefficient K (i) as shown in FIG. 9 (e) or FIGS. 11 (b) to 11 (d) is changed according to the face position information. Then, by setting the K (i) value of the area including the face of the person who is very likely to be the main subject to 1, the area of the peripheral area of the imaging screen is set as the selection area of the reference value BaseR. The K (i) value of the peripheral area where no human face exists remains 0.

  Therefore, similarly to the above, it is less likely that the area where the object that has entered the periphery of the imaging screen is not related to the shooting intention is selected as the reference value BaseR area and the flash emission level becomes inappropriate. It becomes possible to do. As a result, the accuracy of extracting the main subject area intended by the photographer, that is, the probability of the exposure as expected by the photographer can be further increased.

  Similarly to Japanese Patent Application Laid-Open No. 2005-275265, it is possible to perform imaging by flash light emission in which the main light emission amount is determined with high weighting on the main subject region and a region at an equivalent distance. As a result, it is possible to maintain the effect of preventing the exposure of the imaging result from varying due to the flash emission amount changing when the subject moves or changes the composition in the same shooting scene.

[Other Embodiments]
In the first and second embodiments, the case where the face position information and the face size information are used as the face information of the present invention has been described as an example. However, the present invention is not limited to this. The present invention is also applicable when only face position information is used as face information.

  The object of the present invention is achieved by executing the following processing. That is, a storage medium in which a program code of software that realizes the functions of the above-described embodiments is supplied to a system or apparatus, and a computer (or CPU, MPU, etc.) of the system or apparatus is stored in the storage medium. This is the process of reading the code.

  In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code and the storage medium storing the program code constitute the present invention.

  Moreover, the following can be used as a storage medium for supplying the program code. For example, floppy (registered trademark) disk, hard disk, magneto-optical disk, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW, magnetic tape, nonvolatile memory card, ROM or the like. Alternatively, the program code may be downloaded via a network.

  Further, the present invention includes a case where the function of the above-described embodiment is realized by executing the program code read by the computer. In addition, an OS (operating system) running on the computer performs part or all of the actual processing based on an instruction of the program code, and the functions of the above-described embodiments are realized by the processing. Is also included.

  Furthermore, a case where the functions of the above-described embodiment are realized by the following processing is also included in the present invention. That is, the program code read from the storage medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Thereafter, based on the instruction of the program code, the CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing.

It is a block diagram which shows the internal structure of the camera main body, interchangeable lens, and flash apparatus as an imaging device which concerns on the 1st Embodiment of this invention. It is a figure which shows the structural example of the sensor for focus detection of a camera. It is a figure which shows the structural example of the sensor for photometry of a camera. It is a figure which shows the corresponding positional relationship of the focus detection position in the imaging screen by a focus detection sensor, and the sensor for photometry divided into 35. It is a block diagram which shows the structural example of the electric circuit of a camera main body, an interchangeable lens, and a flash apparatus. It is a flowchart which shows the specific operation | movement sequence in connection with this invention in a camera. It is a flowchart which shows the specific operation | movement sequence in connection with this invention in a camera. It is a flowchart which shows the detail of the arithmetic processing which determines the main light emission amount (main light emission gain) of a light emission part. It is a figure which shows the example of the table for LVL0 determination. (A)-(f) is a figure which shows K (i) value. It is a figure which shows the example of the table for W (i) value determination. (A)-(e) is a figure which shows the example of the setting combination table of the coefficient K (i) which limits the choice area for selecting the reference value BaseR which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera main body 2 Interchangeable lens 3 Flash apparatus 12 Image pick-up element 20 Focus detection sensor 26 Photometric sensor 34 Light emission part 37 Light emission amount sensor 41 Control part 43 Signal processing circuit 61 Control part

Claims (5)

An imaging apparatus capable of photographing using a light emitting means for emitting light to a subject,
A photometric means having a plurality of photometric areas and performing photometry on each photometric area;
Acquisition means for acquiring face information of the subject based on an image signal obtained by imaging;
A first luminance value obtained by photometry by the photometry means when the light emission means is not lit, and a second luminance value obtained by photometry by the photometry means when the light emission means is lit. A luminance ratio calculating means for calculating a ratio with a luminance value for each photometric area of the plurality of photometric areas ;
Extraction means for extracting a ratio value serving as a reference from the ratio between the first luminance value and the second luminance value in each photometric area calculated by the luminance ratio calculating means;
A setting unit configured to set a target photometric area to be a target for extracting the reference ratio value by the extracting unit based on the face information acquired by the acquiring unit;
Result of the comparison between the values of the ratio computed by the reference a ratio of the value before Symbol luminance ratio calculating unit extracted by said extraction means to a plurality of photometric areas including metering area other than the target metering area A weighting calculation means for performing weighting calculation of luminance values of a plurality of photometry areas including a photometry area other than the target photometry area obtained by photometry by the photometry means,
A light emission amount calculating means for calculating a main light emission amount of the light emitting means based on a result of the weighting calculation by the weight calculating means;
An imaging apparatus comprising:   The imaging apparatus according to claim 1, wherein the setting unit sets a predetermined photometric area as the target photometric area when the acquiring unit cannot acquire the face information.   The imaging apparatus according to claim 1, wherein the face information includes face position information indicating a position of a person's face included in a subject on an imaging screen of the imaging apparatus.   The face information includes face position information indicating a position of a face of a person included in a subject on an image pickup screen of the image pickup apparatus, and face size information indicating a size of the face of the person. The imaging apparatus according to 1 or 2. A method for controlling an imaging apparatus capable of photographing using a light emitting means for emitting light to a subject,
A photometric step having a plurality of photometric areas and performing photometry on each photometric area;
An acquisition step of acquiring face information of the subject based on an image signal obtained by imaging;
A first luminance value obtained by photometry in the photometry step when the light emitting means is not emitting light, and a second luminance value obtained by photometry in the photometry step when the light emitting means is emitted. A luminance ratio calculating step of calculating a ratio with a luminance value for each photometric area of the plurality of photometric areas ;
An extraction step of extracting a reference ratio value from a ratio between the first luminance value and the second luminance value in each photometric area calculated in the luminance ratio calculating step;
A setting step of setting a target photometry area to be a target for extracting the reference ratio value by the extraction step based on the face information acquired by the acquisition step;
Result of the comparison between the value of the ratio calculated by the value before Symbol luminance ratio calculating step of the ratio to be the reference extracted by the extraction step for a plurality of photometric areas including metering area other than the target metering area A weighting calculation step for performing a weighting calculation of luminance values of a plurality of photometric areas including a photometric area other than the target photometric area obtained by photometry in the photometric step,
A light emission amount calculating step for calculating a main light emission amount of the light emitting means based on a result of the weighting calculation by the weighting calculation step;
A control method characterized by comprising:

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