JP2015099257A - Illumination device, imaging device, illumination method, and reflection area determination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To estimate an area where a quantity of light of reflected light is large due to actual light emission without being influenced by a factor other than pre-light emission even if brightness of an object changes by the factor other than the pre-light emission between time before the preliminary light emission and time during the pre-light emission.SOLUTION: Differences in a luminance value of each color component (dR, dG, and dB) between illumination areas A11 and A21 are calculated on the basis of photometric information acquired before pre-light emission and that acquired during the pre-light emission. Likewise, differences in a luminance value of each color component between person areas A12 and A22 are calculated. A first ratio dR/dG and a second ratio dB/dG of the illumination areas A11 and A21 and those of the person areas A12 and A22 are calculated, and it is determined whether each calculation result is within a range from a lower limit to an upper limit acquired from ratios of the color components of the pre-light emission. As a result, it is determined that a person area is a reflected area where a quantity of light of reflected light by the pre-light emission is large.

Description

  The present invention relates to an illumination device that emits light to a subject in order to determine the amount of light of a flash.

  Conventionally, pre-emission is performed to determine the amount of main emission of the flash. When determining the amount of light, first, the photometric sensor acquires photometric information of each area in the subject before and during pre-emission. By comparing the photometric information before and during pre-emission, an area where the amount of reflected light due to pre-emission is large is specified. The identified area is estimated to be an area where the amount of reflected light by main light emission is large.

  However, the above-described technique has a problem that proper estimation cannot be performed when, for example, a blinking illumination is included in the subject. For example, when the illumination is not lit before pre-emission and is lit during pre-emission, it is erroneously determined that the illumination area is an area where the amount of reflected light due to pre-emission is large. For this reason, the light quantity of this light emission is not determined appropriately.

  On the other hand, a camera disclosed in Patent Document 1 is known as a camera that detects a region in which pre-emission is regularly reflected by comparing the color of reflected light by pre-emission and the color of pre-emission. In this camera, the region where the color of the reflected light by the pre-emission is the same as the color of the pre-emission is determined to be an abnormal region where the pre-emission is regularly reflected.

JP 2005-134468 A

  However, even if the camera disclosed in Patent Document 1 is used, the color of the reflected light due to the pre-emission varies from subject to subject, so that regions other than the regular reflection region cannot be detected, and the above problem cannot be solved.

  In the present invention, even when the brightness of the subject changes between before the pre-flash and during the pre-flash due to a factor other than the pre-flash, the reflected light of the pre-flash is not affected by the factor. It is an object of the present invention to provide an illumination device, an imaging device, an illumination method, and a reflection region determination device that determine a region with a large amount of light.

  An illumination device according to the present invention includes a pre-flash unit that emits light toward a subject before shooting the subject, a photometric unit that acquires photometric information in a state where the subject is divided into a plurality of areas, and a subject at the time of shooting. The illumination means for irradiating the illumination light, and the light quantity calculation means for calculating the illumination light amount of the illumination light based on the photometric information acquired by the photometry means. Based on the luminance information of each color component for each area included in the first photometry information acquired by the photometry means when there is not and the second photometry information acquired by the photometry means while the pre-light emission means is emitting light Calculating the amount of change in the luminance information of each color component for each region, specifying the region in which the amount of change in the luminance information of each color component is within a predetermined range as the reflective region, and lighting means so that the reflective region is properly exposed Irradiation intensity It is characterized by computing.

  Preferably, the predetermined range is set for each color component in accordance with the color of light emitted by the pre-light emitting means. Preferably, the predetermined range is set for each color component, and an upper limit value and a lower limit value are provided. Preferably, when there are a plurality of reflection areas, the light amount calculation means determines a reflection area to be appropriately exposed based on the amount of change in the reflection area and / or the size of the area of the reflection area. To calculate the irradiation light quantity of the irradiation means.

  Preferably, the light amount calculation unit calculates the irradiation light amount of the irradiation unit so that a reflection region having a large amount of change is appropriately exposed. Preferably, the light amount calculation means calculates the irradiation light amount of the irradiation means so that the reflection area having the maximum area is properly exposed. Preferably, the apparatus further includes a photometric area setting unit that sets, as a photometric area, an area in which the photometric means acquires photometric information from a plurality of areas in the subject, and the light amount calculation unit specifies a reflection area in the photometric area. Preferably, the light amount calculation means calculates the irradiation light amount of the irradiation means so as to perform photographing with the maximum light amount when the reflection area cannot be specified.

  Preferably, the color of the luminance information includes either R / G / B or Y / M / C combination.

  In addition, an imaging apparatus according to the present invention is characterized in that any one of the above-described illumination devices can be incorporated or externally attached. Preferably, in a state where the movable mirror is disposed in the optical path from the photographing optical system to the image sensor and the movable mirror is disposed in the optical path, the subject image is formed on the finder screen, and in the state where the movable mirror is retracted from the optical path, The apparatus further includes a single-lens reflex configuration in which a subject image is formed on an image sensor and photographing data can be acquired, and the photometric means acquires photometric information from the subject image formed on the finder screen.

  Preferably, the subject image via the photographing optical system is formed on the image sensor and the photographing data can be acquired, and the photometric means is photometric by the subject image via a photometric optical system different from the photographing optical system. It is arranged at a position to acquire information.

  The illumination method according to the present invention includes a pre-flash method that emits light toward a subject before shooting the subject, a photometric method that acquires photometric information in a state where the subject is divided into a plurality of regions, A first light metering information acquired when no light emission is performed, including a lighting method for irradiating a subject with illumination light, and a light amount calculation method for calculating an irradiation light amount of the illumination light based on the acquired photometric information; Based on the luminance information of each color component for each area included in the second photometric information acquired in the area, the amount of change in the luminance information of each color component for each area is calculated, and the change in the luminance information of each color component An area where the amount is in a predetermined range is specified as a reflection area, and the amount of irradiation light is calculated so that the reflection area is properly exposed.

  The reflection area determination apparatus according to the present invention includes a light emitting unit that emits light toward a subject before photographing the subject, and a photometric unit that acquires photometric information in a state where the subject is divided into a plurality of regions. Each color component for each area included in the first photometric information acquired by the photometric unit when the light emitting unit does not emit light and the second photometric information acquired by the photometric unit while the light emitting unit emits light On the basis of the luminance information, the amount of change in the luminance information of each color component for each region is calculated, and the region in which the amount of change in the luminance information of each color component is within a predetermined range is specified as the reflection region.

  According to the present invention, even when the brightness of the subject changes due to a factor other than the pre-flash before and during the pre-flash, the reflection due to the pre-flash is not affected by the factor. It is possible to determine an area where the amount of light is large.

It is a side view which shows the structure of the digital camera which concerns on embodiment of this invention. 1 is a system configuration diagram of a digital camera. It is a conceptual diagram which shows the light quantity adjustment process in CPU of FIG. It is a figure which shows an example for demonstrating a reflection area specific process. It is a flowchart which shows the operation | movement of light quantity adjustment control. FIG. 5 is a diagram showing a flash photographed image when the reflection area specifying process of the present embodiment is not performed in the example of FIG. 4. It is a figure which shows another example for demonstrating a reflection area specific process. It is a figure for demonstrating the continuation of the reflective area | region identification process in FIG. It is a figure for demonstrating the detail of the reflective area | region identification process in FIG. It is a figure which shows the determination result of the reflective area | region when not performing the reflective area | region specific process of this embodiment in the example of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of the camera 10 with the photographing lens removed. The camera 10 is a single lens reflex camera. That is, in the camera 10, the movable mirror is disposed in the optical path from the photographing optical system to the image sensor. Further, when the movable mirror is disposed on the optical path, the subject image is formed on the finder screen, and when the movable mirror is retracted from the optical path, the subject image is formed on the image sensor, and photographing data can be acquired. In addition, the photometric means acquires photometric information from the subject image formed on the finder screen. As shown in FIG. 1, a flash 11 is provided on the upper surface of the camera body, and a flash pop-up button 13 for popping up the flash 11 is provided below the flash 11.

  FIG. 2 shows a system configuration diagram of the digital camera. The photometric sensor (photometric means) 21, the image sensor 23, and the AF sensor 25 are connected to the signal processing unit 30. The photometric sensor 21 acquires photometric information of the subject, and the AF sensor 25 acquires information indicating the focused state of the subject. The image sensor 23 acquires image data of the subject. The signal processing unit 30 controls the function of each part of the camera 10. The signal processing unit 30 is provided with a CPU (light amount calculation means) 31. The CPU 31 generates pre-flash control information and main flash control information for the flash (pre-flash means, illumination means) 11, and the control information is sent to the flash 11. An LCD display 51, an operation unit 52, a motor driver 53, and an SDRAM 54 are connected to the signal processing unit 30, and a memory card 55 is detachably attached.

  Before the subject is photographed, the flash 11 performs pre-light emission with a predetermined amount of light toward the subject by a control signal from the CPU 31. The photometric sensor 21 acquires photometric information of the subject. The acquired photometric information is sent to the CPU 31, and the CPU 31 determines the amount of main light emission of the flash 11 based on the photometric information input during flash photography. The control information of the determined light quantity is sent to the flash 11, and based on this control information, the flash 11 irradiates the subject with illumination light while adjusting the light quantity of the main light emission at the time of photographing. A focus control signal acquired by the AF sensor 25 is input to the signal processing unit 30. At the time of photographing, the signal processing unit 30 inputs a driving signal to the motor driver 53, and the motor driver 53 drives a photographing optical system (not shown), a mechanical shutter (not shown) and the like based on this driving signal. Thereby, the image sensor 23 acquires image data of the subject.

  The image data acquired by the image sensor 23 is sent to the signal processing unit 30 and is temporarily stored in the SDRAM 54 in the RAW format. The signal processing unit 30 can compress the image data in the RAW format into image data in the JPEG format or the like. The LCD display 51 displays a captured image based on the image data output from the signal processing unit 30. The memory card 55 stores the image data output from the signal processing unit 30. The operation unit 52 is a flash pop-up button 13 provided on the camera body, a release button, a shooting mode switching dial, or the like. An operation instruction signal generated by operating the operation unit 52 is input to the CPU 31.

  FIG. 3 is a conceptual diagram showing light amount calculation processing for determining the light amount of main light emission in the CPU 31. In the present embodiment, photographing is performed by causing the flash 11 (see FIG. 2) to emit light. The luminance value change amount calculation unit 101 receives the first photometric information obtained in the state of only external light before pre-emission during photographing. The light receiving surface of the photometric sensor 21 (see FIG. 2) is divided into 77 regions of 7 rows and 11 columns, and photometric information is obtained for the 77 regions. A photoelectric conversion element is provided in each region of the photometric sensor 21, and luminance values R1 (x, y) and G1 (x, x, y) of R (red), G (green), and B (blue) components are provided. y) and B1 (x, y) (x = 1, 2,... 11, y = 1, 2,... 7) are acquired for each region. That is, the photometric information includes luminance information of each color component for each divided area.

The luminance value change amount calculation unit 101 receives the second photometric information obtained during pre-emission during shooting. Similarly to the first photometric information, the second photometric information is also divided into a plurality of areas, and the luminance values R2 (x, y), G2 (x, y), and B2 (x, y) of each color component are areas. Acquired every time. The luminance value change amount calculation unit 101 is based on the first and second photometric information, and the luminance value difference dR (x, y), dG (x, y), dB (x, y) of each color component for each region. Is calculated. dR (x, y), dG (x, y), and dB (x, y) are obtained by the following equations (1) to (3).
dR (x, y) = R2 (x, y) -R1 (x, y) (1)
dG (x, y) = G2 (x, y) -G1 (x, y) (2)
dB (x, y) = B2 (x, y) -B1 (x, y) (3)

  Differences in luminance values dR (x, y), dG (x, y), and dB (x, y) of each color component for each region are input to the reflection region determination unit 103, and the reflection region determination unit 103 performs the process for each region. A ratio dR / dG of 1 and a second ratio dB / dG are calculated. This is for determining whether the ratio of each color component in the amount of change in luminance value is equal to the ratio of the color components of pre-emission. The reflection area determination unit 103 determines whether the first ratio dR / dG and the second ratio dB / dG are close to the ratio of the pre-light emission color components for each area. That is, it is determined whether or not each of the upper limit value and the lower limit value is obtained from the ratio of the color components of the pre-light emission. Further, the upper limit value and the lower limit value are set with respect to the ratio between any one color component and any other color component in the amount of change in the luminance value in accordance with the color development of the light emitted by the flash 11. . Specifically, it is determined whether m1 ≦ dR / dG ≦ M1 and m2 ≦ dB / dG ≦ M2.

  When the first ratio dR / dG and the second ratio dB / dG are within the respective upper limit value and lower limit value, the reflection area determination unit 103 sets the area to an area where the amount of reflected light by pre-emission is large. It is determined that the reflection area is. When the determination of whether or not all the regions are reflective regions is completed, the determination result is input to the light amount calculation unit 105. When the reflection region is detected, the light amount calculation unit 105 calculates the amount of light with which the reflection region is properly exposed. That is, the light amount calculation unit 105 calculates the irradiation light amount of illumination light of the flash 11 (see FIG. 2) based on the photometric information acquired by the photometric sensor 21 (see FIG. 2).

  The process for specifying the reflection area will be described with reference to the example of FIG. In this example, the subject includes blinking illumination and a person. A conceptual diagram P1 of the first photometric information acquired before the pre-emission by the photometric sensor 21 (see FIG. 2) shows an illumination area A11 and a person area A12. The luminance value of the illumination area A11 is (R1, G1, B1) = (0, 0, 50). The luminance value of the person area A12 is (R1, G1, B1) = (100, 50, 0). On the other hand, in the conceptual diagram P2 of the second photometric information acquired during the pre-emission by the photometric sensor 21, both the luminance value of the illumination area A21 and the luminance value of the person area A22 are (R2, G2, B2) = ( 200, 150, 100). In this specification, the luminance value is 256 gradations and is represented by a numerical value of 0 to 255.

  The difference between the luminance values of the illumination areas A11 and A21 is calculated as (dR, dG, dB) = (200, 150, 50). On the other hand, the difference between the luminance values of the person areas A12 and A22 is calculated as (dR, dG, dB) = (100, 100, 100). The lower limit value and upper limit value of the first ratio dR / dG determined from the ratio of the color components of the pre-emission are m1 = 0.8 and M1 = 1.2, respectively, and the lower limit value of the second ratio dB / dG The upper limit values are m2 = 0.8 and M2 = 1.2, respectively. In the example of FIG. 4, in the illumination region, dR / dG = 200/150> 1.2 (= upper limit value M1) and dB / dG = 50/150 (<lower limit value m2). It is determined that the region is not a reflection region. On the other hand, in the person area (lower limit value m1 ≦) dR / dG = 1 (≦ upper limit value M1) and (lower limit value m2 ≦) dB / dG = 1 (≦ upper limit value M2), It is determined that the region is a reflection region.

  With reference to FIG. 5, the light amount adjustment control for adjusting the light amount of the main light emission using the reflection region determination process will be described. In step S1, the photometric sensor 21 (see FIG. 2) acquires first photometric information before pre-emission. Further, the photometric sensor 21 acquires the second photometric information during the pre-emission in step S2. In step S3, the luminance value change amount calculation unit 101 (see FIG. 3) calculates the change amounts dR, dG, and dB of the luminance value of each color component for each region based on the first and second photometric information. Based on the amount of change in the luminance value of each color component, in step S4, the reflection area determination unit 103 (see FIG. 3) calculates a first ratio dR / dG and a second ratio dB / dG for each area. Next, in step S5, is the first ratio dR / dG within the range between the lower limit value m1 and the upper limit value M1, and is the second ratio dB / dG within the range between the lower limit value m2 and the upper limit value M2? The reflection area determination unit 103 determines whether each area. In step S6, the reflection region determination unit 103 determines that the region satisfying the condition in step S5 is a reflection region. On the other hand, in step S7, it is determined that the region that does not satisfy the condition in step S5 is not a reflection region.

  When the determination in step S5 is completed for all regions, in step S8, the light amount calculation unit 105 (see FIG. 3) determines whether or not there is a reflection region based on the information input from the reflection region determination unit 103. If it is determined that there is a reflection area, that is, if there is even one reflection area, in step S9, the light amount calculation unit 105 uses a known technique to make the reflection area be properly exposed (see FIG. 2). ) Is calculated. On the other hand, if it is determined that there is no reflection area, in step S10, the light amount calculation unit 105 determines the light amount of the main light emission of the flash 11 to full light emission, that is, the maximum light amount by a known method.

  As described above, in this embodiment, the difference between the luminance value of each color component for each area acquired before the pre-light emission and the luminance value of each color component for each area acquired during the pre-light emission is calculated, and the calculated difference is calculated. A first ratio dR / dG and a second ratio dB / dG, which are ratios of luminance values in the respective color components, are calculated. When the first ratio dR / dG and the second ratio dB / dG are within the range of the lower limit value and the upper limit value determined by the color of the pre-light emission, respectively, this is a reflection region where the amount of reflected light due to the pre-light emission is large. It is determined. That is, an area in which the amount of change in luminance information of each color component is within a predetermined range is specified as a reflection area. When the reflection area exists, the light amount is calculated based on the reflection area. When the reflection area does not exist, full light emission is set. Therefore, even when the brightness of the subject changes between pre-flash and pre-flash due to brightness factors other than pre-flash, the color of the brightness factor approximates the pre-flash color. Unless this is done, the factor of brightness does not affect the process of specifying the reflection area. Therefore, even when the brightness of the subject changes between before the pre-flash and during the pre-flash, it is possible to estimate an area where the amount of reflected light due to the main flash is large. .

  On the other hand, a case where the reflection area specifying process of the present embodiment is not performed will be described with reference to FIG. In this case, the person area A32 is darker than the illumination area A31 in the image P3 acquired by the imaging device during flash photography in the example of FIG. This is because it is determined that the illumination area A31 and the person area A32 are reflection areas. This determination occurs because the conventional reflection area specifying process does not calculate the difference in luminance value of each color component for each area before and during pre-light emission. On the other hand, in this embodiment, since the difference in luminance value of each color component for each area is calculated, it is determined that only the person area A32 is a reflection area, and an image in which the person area A32 has appropriate brightness is obtained.

  The process of specifying the reflection area will be further described with reference to the example of FIG. In this example, it is assumed that the subject includes a person and a lighted object, but a camera shake has occurred between the acquisition of the first photometric information and the acquisition of the second photometric information. In the conceptual diagram P4 of the first photometric information acquired before the pre-emission by the photometric sensor 21 (see FIG. 2), the sky region A43 and the ground region A44 are shown in addition to the light-up object region A41 and the person region A42. . The brightness values of the light-up object area A41, the person area A42, the sky area A43, and the ground area A44 are (R1, G1, B1) = (200, 150, 100), (100, 50, 0), (0, 0,0), (100,50,25). On the other hand, as shown in FIG. 8, in the conceptual diagram P5 of the second photometric information acquired during the pre-emission by the photometric sensor 21, the light-up object area A51, the person area A52, the sky area A53, the ground area The luminance values of 54 are (R2, G2, B2) = (200, 150, 100), (200, 150, 100), (0, 0, 0), (100, 50, 25), respectively. On the other hand, between the conceptual diagram P4 and the conceptual diagram P5, the light-up object region and the person region are displaced rightward due to camera shake.

  In the example of FIG. 7, the calculation of the difference in luminance value between the conceptual diagram P4 and the conceptual diagram P5 will be described in detail with reference to FIG. Conceptual diagram P6 is obtained by superposing conceptual diagram P4 (see FIG. 7) and conceptual diagram P5 (see FIG. 8). In the light-up object region and the person region, a solid line Lc indicates a position during pre-light emission (conceptual diagram P5), and a broken line Ld indicates a position before pre-light emission (conceptual diagram P4). The difference in the brightness value of the light-up object region is calculated for each of the five regions A60, A61, A62, A63, and A64 shown in the figure. For each of the five regions, (dR, dG, dB) = (0, 0, 0), (200, 150, 100), (100, 100, 75), (−200, −150, −100), ( -100, -100, -75). On the other hand, the difference in luminance value of the person area is also calculated for each of the five areas A65, A66, A67, A68, A69 shown in the figure. For each of the five regions, (dR, dG, dB) = (100, 100, 100), (200, 150, 100), (100, 100, 75), (−100, −50, 0), (0 , 0, 25).

  Therefore, when the lower limit value and the upper limit value of the first ratio dR / dG and the second ratio dB / dG are the same as in the example of FIG. 4, the first of the five regions A60, A61, A62, A63, A64 The ratio dR / dG and the second ratio dB / dG are not included in the range from the lower limit value to the upper limit value. On the other hand, the first ratio dR / dG and the second ratio dB / dG in the region A65 are included in the range of the lower limit value and the upper limit value. For this reason, it is determined that only the area A65 of the person area is a reflection area.

  As described above, according to the present embodiment, even when a camera shake occurs between the acquisition of the first photometry information and the acquisition of the second photometry information, the main area A65 in the person area can be specified as the reflection area. For this reason, it is possible to appropriately specify a region where the amount of reflected light by pre-emission is large.

  On the other hand, the case where the reflection area specifying process of the present embodiment is not performed in the example of FIG. 7 will be described with reference to FIG. In this case, in the conceptual diagram P7 showing the difference between the luminance values acquired before the pre-light emission and during the pre-light emission, both the partial area A71 and the person area A72 of the light-up object are specified as the reflection areas.

  In FIG. 1, the illumination unit is described as the built-in flash, but the present invention is not limited to this. That is, the illumination means includes a flash externally attached to the camera and continuous illumination means such as LED illumination. The illumination unit that performs the main emission and the pre-emission unit that performs the pre-emission may be separate members. The photometric means may be the image sensor 23 (see FIG. 2). When the photometric means is a photometric sensor, the light passing through the photographing optical system and the finder screen may be measured, or the light passing through the photometric optical system may be measured. The photometric sensor may be a CCD having several tens of thousands (hundreds of several hundreds) pixels.

  In the present embodiment, since the xenon tube used for the flash of the normal camera is white light, the lower limit value m1 and the upper limit value M1 of the first ratio dR / dG, and the lower limit value m2 of the second ratio dB / dG. And the upper limit M2 are all set to about 1, but the present invention is not limited to this. That is, even when the color of the light source for pre-light emission is a little red or a little blue, the upper limit value and the lower limit value are set based on the color of the light source.

  In the present embodiment, the reflection region is specified depending on whether the first ratio dR / dG and the second ratio dB / dG are within a predetermined range. However, the change amounts dR, dG, and dB of the respective color components are predetermined. The reflection region may be specified depending on whether it is in the range of. For example, when the pre-light emission is performed by the AF auxiliary light that emits red light, it may be determined whether the change amount dR of the R component is within a predetermined range.

  Moreover, although this embodiment demonstrated the case where one reflection area was specified, a some reflection area may be specified. In this case, the reflection area to be properly exposed is determined based on the magnitudes of the change amounts dR, dG, dB of the color components in the reflection area and / or the size of the area of the reflection area, and the amount of irradiation light of the flash is calculated. Is done. In this case, the amount of irradiation light of the flash may be calculated so that the reflection area where the change amounts dR, dG, and dB of each color component are large is appropriate exposure. Further, the amount of light emitted from the flash may be calculated so that the reflection area having the maximum area is properly exposed.

  In the present embodiment, the case of full-surface photometry for measuring the entire area of the subject has been described. However, partial photometry for measuring a partial area of the subject may also be used. The partial region is, for example, a central portion having an area of 10% of the whole. The selection between full face metering and partial metering may be based on an input from the operation unit 52 (see FIG. 2) by the photographer or may be automatically performed according to the focal length of the photographing lens. In the case of partial photometry, the photometry area may be narrowed in the case of a wide-angle lens with a short focal length, and the photometry area may be widened in the case of a telephoto lens with a long focal length. This is because in the case of a wide-angle lens, various objects such as the sky, the ground, and personal objects easily enter the angle of view for shooting. In the case of partial photometry, the CPU (photometry area setting means) 31 (see FIG. 2) sets, as a photometry area, an area in which the photometry sensor 21 (see FIG. 2) acquires photometry information from a plurality of areas in the subject. In the set photometry area, the light amount calculation unit 105 (see FIG. 3) identifies the reflection area.

  In the present embodiment, the case where the color component of the luminance information is a combination of R / G / B has been described. However, the present invention is not limited to this, and the combination of R / G / B or Y / M / C is used. Any one may be included.

  The camera to which the present invention is applied may be a compact camera or a mirrorless single-lens reflex camera having a dedicated photometric optical system and no lens exchange. That is, in a camera to which the present invention is applied, a subject image via a photographing optical system is formed on an image sensor, and photographing data can be acquired. The photometric means is disposed at a position where photometric information is acquired from a subject image via a photometric optical system different from the photographing optical system.

DESCRIPTION OF SYMBOLS 10 Camera 11 Flash 21 Photometric sensor 23 Image pick-up element 30 Signal processing part 31 CPU
DESCRIPTION OF SYMBOLS 101 Luminance value variation | change_quantity calculation part 103 Reflection area | region determination part 105 Light quantity calculating part P1, P2, P4-P7 Conceptual diagram P3 Image A11, A21, A31 Illumination area A41, A51 Light-up object area A12, A22, A32, A42, A52 , A72 Person area A60-A69, A71 area

Claims (14)

Pre-flash means for emitting light toward the subject before photographing the subject;
Photometric means for obtaining photometric information in a state where the subject is divided into a plurality of areas;
Illumination means for illuminating the subject with illumination light during photographing;
A light amount calculating means for calculating an irradiation light amount of illumination light of the illuminating means based on the photometric information acquired by the photometric means,
The light amount calculation means includes first photometry information acquired by the photometry means when the pre-light emission means does not emit light, and second photometry obtained by the photometry means while the pre-light emission means emits light. On the basis of the luminance information of each color component for each region included in the information, the amount of change in luminance information for each color component for each region is calculated, and the amount of change in luminance information for each color component is within a predetermined range. An illumination device characterized in that a certain area is specified as a reflection area, and an irradiation light amount of the illumination unit is calculated so that the reflection area is appropriately exposed.   The lighting device according to claim 1, wherein the predetermined range is set for each color component in accordance with color development of light in light emission performed by the pre-light-emitting unit.   The lighting device according to claim 1, wherein the predetermined range is set for each color component, and an upper limit value and a lower limit value are provided.   When there are a plurality of reflection areas, the light amount calculation means determines a reflection area to be properly exposed based on the amount of change in the reflection area and / or the size of the area of the reflection area. The illumination device according to claim 1, wherein an irradiation light amount of the irradiation unit is calculated.   5. The illumination apparatus according to claim 4, wherein the light amount calculation unit calculates an irradiation light amount of the irradiation unit so that a reflection region having a large change amount is appropriately exposed.   5. The illumination apparatus according to claim 4, wherein the light amount calculating unit calculates the irradiation light amount of the irradiating unit so that the reflection area having the maximum area is appropriately exposed. A photometric area setting means for setting, as a photometric area, an area where the photometric means acquires the photometric information from a plurality of areas in the subject;
The illumination apparatus according to claim 1, wherein the light amount calculation unit specifies the reflection area in the photometry area.   The illumination according to any one of claims 1 to 7, wherein the light amount calculation unit calculates the irradiation light amount of the irradiation unit so that photographing is performed with the maximum light amount when the reflection region cannot be specified. apparatus.   9. The lighting device according to claim 1, wherein the color component of the luminance information includes one of a combination of R / G / B and Y / M / C.   An imaging apparatus, wherein the illumination apparatus according to claim 1 can be built in or externally attached. When the movable mirror is disposed in the optical path from the imaging optical system to the image sensor, and the movable mirror is disposed in the optical path, the subject image is formed on the finder screen, and the movable mirror is retracted from the optical path. , Further comprising a single-lens reflex configuration in which a subject image is formed on the image sensor and photographing data can be acquired;
The imaging device according to claim 10, wherein the photometric unit acquires the photometric information from a subject image formed on the finder screen. The subject image via the photographic optical system is imaged on the image sensor, and photographic data can be acquired.
The imaging apparatus according to claim 10, wherein the photometric unit is arranged at a position where the photometric information is acquired from a subject image via a photometric optical system different from the photographing optical system. A pre-flash method that emits light toward the subject before shooting the subject;
A photometric method for obtaining photometric information in a state where the subject is divided into a plurality of areas;
An illumination method for illuminating the subject with illumination light during shooting;
A light amount calculation method for calculating an irradiation light amount of the illumination light based on the acquired photometric information,
Each color for each region based on the luminance information of each color component for each region included in the first photometric information acquired when light emission is not performed and the second photometry information acquired during light emission, respectively. Calculating the amount of change in the luminance information of the component, specifying the region where the amount of change in the luminance information of each color component is within a predetermined range as the reflective region, and calculating the amount of irradiation light so that the reflective region is properly exposed A lighting method characterized by: Light emitting means for emitting light toward the subject before photographing the subject;
Photometric means for obtaining photometric information in a state where the subject is divided into a plurality of areas,
The areas respectively included in the first photometric information acquired by the photometric means when the light emitting means does not emit light and the second photometric information acquired by the photometric means while the light emitting means emits light. Based on the luminance information of each color component, the amount of change in the luminance information of each color component for each region is calculated, and the region in which the amount of change in the luminance information of each color component is within a predetermined range is specified as the reflection region A reflection region determination apparatus characterized by the above.

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