Imaging apparatus

Abstract

To provide an imaging apparatus capable of performing exposure control having a wide dynamic range while having low power consumption.SOLUTION: An imaging apparatus has: an imaging section that captures an image of a subject; a photometry section that obtains environmental luminescence in the imaging; and a setting section that sets an exposure value of the imaging section for the imaging. The setting section sets an exposure value at a second time based on luminescence distribution information on a luminescence distribution of the subject obtained from the image captured at a first time and a value of a ratio of the environmental luminescence at the second time later than the first time to the environmental luminescence at the first time.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an imaging device. [Background technology]

[0002] In recent years, diagnostic systems that monitor plants while monitoring their growth, disease, and pests have become widespread. In particular, to precisely measure changes in leaf color and other characteristics that accompany plant growth, it is necessary to capture images that maximize the luminance distribution of the subject relative to the dynamic range of the imaging device.

[0003] Patent Document 1 discloses a configuration for determining exposure during normal imaging based on information indicating the distribution of brightness of each pixel obtained by evaluating the brightness of each pixel of a previously captured image divided into multiple brightness areas. Patent Document 2 discloses a configuration for setting exposure control conditions according to the brightness of an image. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-118520 A [Patent Document 2] JP 2009-273050 A Summary of the Invention [Problem to be solved by the invention]

[0005] In outdoor photography, there are cases where the power supply method is limited to solar batteries, and there are limitations on the amount of power that can be supplied. The configuration of Patent Document 1 is not preferable because it is necessary to photograph the subject twice for each photograph, which requires a large amount of power. In the configuration of Patent Document 2, since the exposure setting conditions are set using only the image, it is necessary to continue photographing, which results in a large amount of power consumption.

[0006] An object of the present invention is to provide an imaging apparatus capable of performing exposure control to obtain a wide dynamic range while consuming low power. [Means for solving the problem]

[0007] An imaging device according to one aspect of the present invention has an imaging section that images a subject, a photometry section that acquires ambient light luminance during imaging, and a setting section that sets an exposure value of the imaging section during imaging, and the setting section is characterized in that it sets the exposure value at a second time based on luminance distribution information regarding the luminance distribution of the subject acquired by imaging at a first time and a value of a ratio of the ambient light luminance at the first time to the ambient light luminance at a second time later than the first time. Effect of the Invention

[0008] According to the present invention, it is possible to provide an imaging apparatus capable of performing exposure control that can obtain a wide dynamic range while consuming low power. [Brief description of the drawings]

[0009] [Figure 1] 1 is a configuration diagram of an imaging device according to a first embodiment. [Diagram 2] 1 is a diagram illustrating an application example of the imaging device according to the first embodiment. [Diagram 3] FIG. 4 is a diagram showing an imaging flow of the imaging apparatus of the first embodiment. [Figure 4] FIG. 4 is a diagram showing an exposure control flow in the first embodiment. [Diagram 5] 4A to 4C are diagrams illustrating an example of a photographing result obtained by the imaging device of the first embodiment. [Figure 6] FIG. 11 is a configuration diagram of an imaging device according to a second embodiment. [Figure 7] 11 is a diagram illustrating an application example of the imaging device according to the second embodiment. [Figure 8] FIG. 11 is a diagram showing an imaging flow of the imaging apparatus according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to refer to the same components, and duplicated descriptions will be omitted. EXAMPLES

[0011] 1 is a configuration diagram of an imaging device 1 of this embodiment. The imaging device 1 has a camera unit (imaging unit) 11, a photometry unit 12, and a control unit 14, and captures and diagnoses the growth state of plants outdoors.

[0012] The camera unit 11 includes a lens 112 for capturing a light beam from a subject to form a subject image, and an image sensor 111 for converting and amplifying an optical signal into an electrical signal. The image sensor 111 is, for example, a CCD or a CMOS. The image sensor 111 may be equipped with an electronic shutter and configured to vary the shutter speed by rewriting a register value from the outside, so as to be controllable to a desired exposure time. The image sensor 111 may also have a function of amplifying the value of an analog / digital converted signal. The lens 112 may have a variable aperture mechanism (not shown) that is controllable from the outside, and may have a function of controlling the aperture state during imaging. By having this function, it is possible to control the light beam transmitted to the image sensor 111 and freely change the brightness and depth of field of the image. In addition, when the ambient light is too bright, for example, an ND (Neutral Density) filter or the like may be attached to the camera unit 11.

[0013] When imaging a plant and diagnosing its color, it is necessary to perform white balance adjustment on the captured image to correspond to a predetermined standard white color. The photometry unit 12 is a means for making the ambient light color correspond to the standard white color, and is a color sensor for taking in the ambient light luminance and selectively receiving each of the ambient light of red (R band), green (G band), and blue (B band). The separation of each band is appropriately performed using a color filter or the like, and the R, G, and B luminance output values ​​are respectively extracted according to the acquired ambient light luminance. In this embodiment, as a typical example, a color filter is assumed to acquire the luminance output values ​​of each color of R wavelength 590 nm to 640 nm, G wavelength 530 to 570 nm, and B wavelength 440 nm to 480 nm, but it can be arbitrarily selected according to the use. The photometry unit 12 needs to be configured so that the luminance output value of each color is not saturated even in daytime conditions when the acquired ambient light luminance is strongest. In addition, it is preferable to reduce the influence of reflection and scattering of the peripheral members of the photometry unit 12 as much as possible. Therefore, it is preferable to appropriately introduce light adjustment means such as a milky white diffusion plate or an ND filter as necessary. For example, the conversion from the luminance output value of each color acquired by the photometry unit 12 to standard white may be performed by the image processing unit 142 described later, for example, by performing a white balance adjustment corresponding to a gray having a specific reflectance on the maximum value of the luminance output value of each color. However, the present invention is not limited to this, and a different method may be used.

[0014] The control unit 14 includes an exposure control parameter calculation unit (setting unit) 141, an image processing unit 142, an image collection unit 143, a CPU 144 that controls the entire calculation, and a recording unit 145 that records and outputs image-related information such as image information and exposure values. The subject image formed by the camera unit 11 is sent to the image collection unit 143, where it is A / D converted and stored as digital image data such as RAW or JPEG. The image processing unit 142 performs various image processing and calculations on the digital image data collected by the image collection unit 143, such as cutting out a predetermined portion of the image, adjusting the white balance, and extracting a luminance value. The exposure control parameter calculation unit 141 calculates and instructs the camera unit 11 on the exposure value for imaging, which is composed of imaging gain (Gain), aperture (Fno), and shutter speed (S / S).

[0015] The camera unit 11 and the photometry unit 12 are applied in the state shown in FIG. 2, for example. FIG. 2 shows an application example of the imaging device 1, which is installed in a field, and monitors the growing crops (e.g., rice, wheat, vegetables, etc.) 2 by taking fixed-point images, and diagnoses information such as grass height information and color information as an index of the growth state. In the imaging device 1, as an example, a pole-shaped support member 13 is inserted into the ground so as to rise from the ground at a predetermined position in the field. The support member 13 is made of a corrosion-resistant material such as aluminum or stainless steel, and has an L-shaped bracket structure. The camera unit 11 is attached to the tip of the bracket structure, and a specific target plant that is the subject of the image can be imaged. The structure of the support member 13 may be changed as appropriate as long as it is functionally sufficient and efficient as the imaging device 1, and various structures such as a rail structure and a hanging structure may be incorporated, but it is preferable that it does not enter the shooting angle of the camera unit 11.

[0016] The photometry unit 12 is attached to the support member 13 and collects the ambient light luminance. The position where the photometry unit 12 is attached does not necessarily have to be in the immediate vicinity of the camera unit 11, and may be near the base of the support member 13 or at another position in the field away from the support member 13. In order to collect the ambient light luminance, the photometry unit 12 is preferably installed so that the light receiving surface faces vertically upward in the direction of the celestial sphere, and even if not, it needs to be positioned so that the incident ambient light is not blocked by itself, surrounding structures, or the crop 2. In addition, if the light receiving surface faces the same side as the camera unit 11 (the crop side), the illumination light cannot be detected correctly due to reflection from the water surface, etc., so the photometry unit 12 is preferably installed so that the normal direction of the light receiving surface is different from the viewing angle of the camera unit 11.

[0017] A control unit 14 may also be attached to the support member 13. The control unit 14 may be disposed in a position close to the camera unit 11, for example by being attached to the support member 13, but may also be disposed in a remote location, for example via a communication facility not shown. In this case, for example, a plurality of camera units 11 and photometry units 12 may be disposed in remote locations, and the control unit 14 may be disposed in a data center or the like to input and output data via cloud technology or the like.

[0018] A power source 15 may be attached to the support member 13. The power source 15 may be one that supplies power via natural energy such as a solar panel or a wind power generator. The power source 15 may be a replaceable battery, or may share power via an external electric wire or the like.

[0019] The imaging flow of the imaging device 1 of this embodiment will be described below. Here, as a hypothetical situation for the purpose of the description, the progress of imaging over three days will be considered as shown in Table 1. Each cell in Table 1 indicates a parameter corresponding to a variable according to the present invention on each day.

[0020] [Table 1]

[0021] 3 is a diagram showing an imaging flow of the imaging device 1 of this embodiment. The imaging device 1 captures images according to the processing of each step. The imaging device 1 starts the imaging flow using a time determination function (not shown) or when an operator instructs the imaging device 1 to capture images at a specific time.

[0022] In step S11, the imaging device 1 uses the photometry unit 12 to obtain the current (second time) ambient light luminance CS2.

[0023] In step S12, the imaging device 1 determines whether or not a reference luminance distribution (luminance distribution information) Yb1 is stored in the recording unit 145. The reference luminance distribution Yb1 is array data (histogram) obtained by extracting the luminance distribution of a subject captured at a first time in the same time period (including substantially the same time period (approximately the same time period)) on the previous day or earlier (past). If the imaging device 1 determines that the reference luminance distribution Yb1 is stored in the recording unit 145, it executes the process of step S13, and if it determines that the reference luminance distribution Yb1 is not stored in the recording unit 145, it executes the process of step S121.

[0024] In step S121, the imaging device 1 performs auto exposure setting so that there is no brightness saturation area in the image. In the process of this step, the brightness in the image may be adjusted by capturing images twice or the like. The exposure value is set and recorded as AE2 (= (Gain2, Fno2, S / S2)), which is a 1×3 array of combinations of gain (Gain), aperture (Fno), and shutter speed (S / S). For simplicity, the exposure value is explained here using the above three elements, but in some cases, further configurations such as inserting and removing filters may be added. The exposure value used when capturing an image and the exposure variable that is the parameter indicated by the exposure value are expressed in a one-to-one correspondence. Table 2 shows the correspondence between each exposure value of Gain, Fno, and S / S and the exposure variables Ga, F, and SS. For example, the exposure value of Fno in column C corresponds to Fno5.6, and the corresponding exposure variable F is 4.

[0025] [Table 2]

[0026] In step S13, the exposure control parameter calculation section 141 sets an exposure value AE2. Fig. 4 is a diagram showing a flow (exposure control flow) for setting the exposure value AE2 by the exposure control parameter calculation section 141.

[0027] In step S131, the exposure control parameter calculation unit 141 acquires a reference exposure value AE1, which is an exposure value set during past imaging, a reference luminance distribution Yb1, and a past ambient light luminance CS1 acquired during past imaging, from the recording unit 145. Here, the reference exposure value AE1 is a one-dimensional three-element array, the reference luminance distribution Yb1 is a two-dimensional array, and the ambient light luminance CS1 is a one-dimensional three-element array of R, G, and B. In this embodiment, the ambient light luminance CS1 (G), which is a single variable obtained by extracting the G element from the ambient light luminance CS1, is used.

[0028] In step S132, the exposure control parameter calculation unit 141 obtains an ambient light function B, which is a ratio of the ambient light luminance CS2(G) to the ambient light luminance CS1(G). The ambient light function B is obtained using the following formula.

[0029] B=CS2(G) / CS1(G) The ambient light function B may be any value that is a ratio of the ambient light luminance CS2 to the ambient light luminance CS1, and may be configured as a linear function or a quadratic curve using coefficients.

[0030] In step S133, the exposure control parameter calculation unit 141 determines whether the product Yb1(max)×B of the maximum value Yb1(max) of the reference luminance distribution Yb1 and the ambient light function B satisfies the following conditional expression (1).

[0031] Ym <Yb1(max)×B<YM (1) If the exposure control parameter calculation section 141 determines that the value Yb1(max)×B satisfies the conditional expression (1), it executes the process of step S134, and if it determines that this is not the case, it executes the process of step S135.

[0032] Although the maximum luminance threshold YM and the minimum luminance threshold Ym are set arbitrarily, it is preferable that the ratio of the maximum luminance threshold YM to the saturation luminance value YMAX of the pixels included in the camera unit 11 satisfies the following conditional expression (2).

[0033] 0.7 <YM / YMAX<0.9 (2) If the lower limit of conditional expression (2) is exceeded, the captured image becomes dark and the luminance range becomes narrow, making it difficult to capture an image with a high dynamic range.If the upper limit of conditional expression (2) is exceeded, the luminance change of the subject and the measurement error of the photometer 12 cannot be absorbed, and the luminance value of the captured image becomes saturated, which may make it impossible to capture a correct image.

[0034] It is preferable that the range of conditional expression (2) is set to the numerical range of the following conditional expression (2a).

[0035] 0.75 <YM / YMAX<0.85 (2a) It is further preferable that the range of conditional expression (2) be the numerical range of the following conditional expression (2b).

[0036] 0.78 <YM / YMAX<0.82 (2b) In step S134, the exposure control parameter calculation section 141 sets the exposure value AE2 to the same value as the reference exposure value AE1.

[0037] In step S135, the exposure control parameter calculation unit 141 sets the exposure function A (=AEP2 / AEP1) so that the determined maximum luminance Ybx(max) (=Yb1(max)*A*B) satisfies the conditional expression (1), where AEP1 and AEP2 are the products of the exposure variables corresponding to the reference exposure value AE1 and the exposure value AE2, respectively.

[0038] In step 136, the exposure control parameter calculation section 141 sets an exposure value AE2 corresponding to a product AEP2 of the exposure function A and the exposure variable. Note that the combination of exposure values ​​AE2 may be changed arbitrarily.

[0039] In step S137, the exposure control parameter calculation unit 141 stores the exposure value AE2 in the recording unit 145.

[0040] In step S14, the imaging device 1 captures an image in accordance with the exposure value AE2.

[0041] In step S15, the image processing unit 142 adjusts the white balance of the image sent from the camera unit 11 to the image collecting unit 143 by using the ambient light luminance CS2 (=(CS2(R), CS2(G), CS2(B))) acquired by the photometry unit 12. One example of a method for adjusting the white balance is to reduce the sensitivity of the camera unit 11 to each RGB component to a sensitivity ratio equivalent to, for example, gray with a reflectance of 18%, which is set as standard white in response to the ambient light luminance CS2 acquired by the photometry unit 12.

[0042] In step S16, the image processing unit 142 performs a subject region extraction process. The subject region extraction process is a process for extracting only subject regions such as leaves and spikes from the captured image and setting the remaining pixels to black (0), and may include work such as trimming the image to focus on the stump to be diagnosed in some cases. Note that, as a method of extracting pixels, for example, when extracting a region corresponding to leaves, there is a method of determining a green region using the RGB values ​​corresponding to each pixel.

[0043] In step S17, the CPU 144 acquires only the luminance of the object region.

[0044] In step S18, the CPU 144 collects the luminance of the object region, obtains it as a luminance distribution Yb2, and stores it. The luminance distribution Yb2 is, for example, a two-dimensional array corresponding to the luminance value and the frequency.

[0045] In step S19, the CPU 144 stores the luminance distribution Yb2 in the reference luminance distribution Yb1 as a luminance distribution update process for use in the next shooting. Therefore, at this time, the maximum values ​​Yb1(max) and Yb2(max) of the reference luminance distribution Yb1 and the luminance distribution Yb2 are the same. The CPU 144 also stores the ambient light luminance CS2 in the ambient light luminance CS1.

[0046] The case where the above flow is executed at the same time on the first, second, and third days of the shooting in Table 1 will be described.

[0047] On the first day of shooting, in step S12, the reference luminance distribution Yb1 is not stored in the recording unit 145, so the processes of steps S121 and S14 are executed. In the process of step S14, the exposure variables Ga2, F2, and SS2 corresponding to the exposure value AE2 are 8, 4, and 4, respectively, and the product AEP2 of the exposure variables is calculated to be 128. After the process of step S14 is executed, the processes of steps S15 to S19 are executed.

[0048] On the second day of shooting, since the reference luminance distribution Yb1 is stored in the recording unit 145 in step S12, the process of step S13 (exposure control flow) is executed. In step S132, the second day is sunny like the first day, and if the obtained ambient light luminance CS2(G) is the same as the ambient light luminance CS1(G) which is the ambient light luminance on the first day, the ambient light function B is calculated to be 1. In step S133, in this embodiment, the saturation luminance value YMAX and the maximum luminance threshold YM are set to 255 and 225, respectively, and the value YM / YMAX is 0.88. In addition, the value Yb1(max)×B is 50, which is smaller than the minimum luminance threshold Ym (=180), and does not satisfy the conditional formula (1). Therefore, after the process of step S133 is executed, the process of step S135 is executed. In step S135, if the exposure function A is set to 4, the determined maximum luminance Ybx(max) is 200, and the conditional formula (1) is satisfied. The product AEP2 of the corresponding exposure variables is 512. In step S136, in this embodiment, the setting priority of the aperture (Fno) that affects the depth of field is set low, and the imaging gain is changed from "4" to "6", thereby changing the exposure variable Ga2 from "8" to "32". This makes the exposure setting four times brighter. After the process of step S13 is executed, the processes of steps S14 to S19 are executed.

[0049] 5 is a diagram showing an example of the result of shooting with the imaging device 1, and shows the concept of the change in luminance distribution between the first and second days of shooting when the above flow is executed. The luminance distribution Yb2 on the second day is about four times brighter than the reference luminance distribution Yb1 on the first day, and it is possible to obtain a luminance distribution with a wide dynamic range on the second day.

[0050] On the third day of shooting, the weather is cloudy, and the ambient light luminance CS2(G) is reduced to about 50% of that of the second day. At this time, in step S132, the ambient light function B is calculated as 0.5. In step S133, in this embodiment, the value Yb1(max)×B is 105, which is smaller than the minimum luminance threshold Ym (=180), and does not satisfy the conditional formula (1). In step S135, the exposure function A is set, and then in step S136, the exposure value AE2 is set. In this embodiment, for example, in order to reduce an increase in noise, the exposure variable SS2 is changed from "4" to "8" by changing the shutter speed S / S from "20" to "40" while maintaining the same values ​​as the previous day for the imaging gain and the aperture. This makes it possible to maintain the luminance distribution Yb2 having a wide dynamic range even when the ambient light luminance CS2(G) is reduced to about half of that of the previous day. After the process of step S13 is executed, the processes of steps S14 to S19 are executed. EXAMPLES

[0051] In this embodiment, only the configuration different from the first embodiment will be described, and a description of the common configuration will be omitted.

[0052] 6 is a configuration diagram of the imaging device 3 of this embodiment. The imaging device 3 has an illumination means 20 as an illumination device in addition to the configuration of the imaging device 1. The illumination means 20 is preferably configured to be low power consumption, bright, and long-lasting, such as an LED. The illumination color may be selected arbitrarily, but it is preferable to select a color temperature close to daylight of about 6000K, since this makes it easier to correct the white balance.

[0053] 7 is a diagram showing an application example of the imaging device 3. The imaging device 3 is intended to be used in environments with little or limited ambient light, such as at night, in a twilight environment, or in a booth. The imaging device 3 is configured to automatically determine the ambient brightness using an ambient light sensor and switch to shooting using the lighting means 20.

[0054] 8 is a diagram showing an imaging flow of the imaging device 3 of this embodiment. The processes of steps S11 to S19 and step S121 have been described in the first embodiment, and therefore description thereof will be omitted in this embodiment.

[0055] In step S20, the imaging device 1 determines whether the ambient light luminance CS2 is less than the threshold ambient light luminance CSth at which illumination light is required. If the imaging device 1 determines that the ambient light luminance CS2 is less than the threshold ambient light luminance CSth, it executes the process of step S21, and if it determines that the ambient light luminance CS2 is not less than the threshold ambient light luminance CSth, it executes the process of step S13.

[0056] In step S21, the imaging device 1 activates the illumination means 20. By executing the process of step S21, it is possible to capture an image with a high dynamic range by taking into account not only changes in the luminance of environmental light such as moonlight or twilight, but also reductions in the luminance of the illumination means 20 and changes in the reflectance of plants as the imaging subject.

[0057] Also, in the imaging device 3, by carrying out the exposure correction flow of FIG. 4, it is possible to set an appropriate exposure value by referring to the reference luminance distribution and the ambient light luminance at the time of previous shooting.

[0058] The disclosure of this embodiment includes the following configuration. (Configuration 1) An imaging unit that captures an image of a subject; a photometry unit for acquiring an environmental light luminance in the image capturing; a setting unit that sets an exposure value of the imaging unit in the imaging; the setting unit sets the exposure value at a second time based on luminance distribution information regarding the luminance distribution of the subject acquired by the imaging at a first time and a value of a ratio of the ambient light luminance at the first time to the ambient light luminance at a second time that is later than the first time. (Configuration 2) 2. The imaging device according to configuration 1, wherein the first time and the second time are times in the same time zone on different days. (Configuration 3) 3. The imaging device according to configuration 1 or 2, wherein the photometry section is provided so that a normal direction of a light receiving surface is different from a viewing angle of the imaging section. (Configuration 4) The imaging device described in any one of configurations 1 to 3, characterized in that the luminance distribution information is determined by correcting white balance using the past ambient light luminance and a preset standard white as parameters. (Configuration 5) The imaging device described in any one of configurations 1 to 4, characterized in that the setting unit sets the exposure value at the second time to the exposure value at the first time when information based on the luminance distribution information and the ratio value is within a predetermined range, and sets the exposure value at the second time to a value different from the exposure value at the first time when the information is not within the predetermined range. (Configuration 6) Let YM be the maximum value of the predetermined range, and YMAX be the saturation luminance value of a pixel included in the imaging unit. 0.7 <YM / YMAX<0.9 6. The imaging device according to configuration 5, wherein the following condition is satisfied: (Configuration 7) 7. The imaging device according to any one of configurations 1 to 6, further comprising a recording unit that records the luminance distribution information and the ambient light luminance at the first time. (Configuration 8) 8. The imaging device according to any one of configurations 1 to 7, wherein the setting section transmits the exposure value at the second time to the imaging section. (Configuration 9) 9. The imaging device according to any one of configurations 1 to 8, wherein the photometry unit acquires ambient light luminance for each color.

[0059] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0060] 1,3 Imaging device 2. Subject 11 Imaging unit 12 Photometry section 141 Exposure control parameter calculation unit (setting unit)

Claims

1. An imaging unit that captures an image of a subject; a photometry unit for acquiring an environmental light luminance in the image capturing; a setting unit that sets an exposure value of the imaging unit in the imaging; an exposure value setting unit that sets the exposure value at a second time based on luminance distribution information regarding the luminance distribution of the subject obtained by the imaging at a first time and a value of a ratio of the ambient light luminance at the first time to the ambient light luminance at a second time that is later than the first time.

2. 2. The imaging device according to claim 1, wherein the first time and the second time are times in the same time zone on different days.

3. 3. The imaging device according to claim 1, wherein the photometry section is provided so that a normal direction of a light receiving surface is different from a viewing angle of the imaging section.

4. 3. The imaging apparatus according to claim 1, wherein the luminance distribution information is determined by correcting white balance using an ambient light luminance at the first time and a preset standard white color as parameters.

5. 3. The imaging device according to claim 1, wherein the setting unit sets the exposure value at the second time to the exposure value at the first time when information based on the values ​​of the luminance distribution information and the ratio is within a predetermined range, and sets the exposure value at the second time to a value different from the exposure value at the first time when the information is not within the predetermined range.

6. Let YM be the maximum value of the predetermined range, and YMAX be the saturation luminance value of a pixel included in the imaging unit. 0.7<YM / YMAX<0.9 6. The imaging apparatus according to claim 5, wherein the following condition is satisfied:

7. 3. The imaging apparatus according to claim 1, further comprising a recording unit that records the luminance distribution information and the ambient light luminance at the first time.

8. 3. The image capture apparatus according to claim 1, wherein the setting section transmits the exposure value at the second time to the image capture section.

9. 3. The imaging apparatus according to claim 1, wherein the photometry unit acquires an ambient light luminance for each color.

Images