JP2010268134A - Imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate control of an exposure amount when the dynamic range of luminance is wide, and a high-luminance object such as the sun is included in a screen. <P>SOLUTION: The imaging device includes: a calculation means to calculate luminance corresponding to each of a plurality of photometric regions included in an imaging region; a first exclusion means to exclude a photometric region corresponding to ultrahigh luminance as an ultrahigh luminance region when the calculated luminance is ultrahigh luminance not smaller than predetermined luminance; a first extraction means to extract maximum luminance out of luminance values corresponding to the photometric regions other than the ultrahigh luminance region excluded by the first exclusion means as first maximum luminance; and a first control means to control an exposure amount based on the extracted first maximum luminance. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an imaging apparatus.

  2. Description of the Related Art Conventionally, there has been known an imaging apparatus configured such that an exposure control method can be selected by an operation such as dialing (for example, Patent Document 1).

JP 2008-104209 A

  However, when the luminance dynamic range is wide and a high-luminance subject such as the sun is included in the screen, there is a problem that it is difficult to control the exposure amount.

The imaging apparatus according to the first aspect of the present invention includes a calculating unit that calculates a luminance corresponding to each of a plurality of photometric areas included in the imaging area, and a super high luminance that is higher than a predetermined luminance when the calculated luminance is higher than a predetermined luminance. A first exclusion means for excluding a photometry area corresponding to high brightness as an ultra-high brightness area, and a maximum brightness among the brightnesses corresponding to photometry areas other than the ultra-high brightness area excluded by the first exclusion means is a first maximum It is characterized by comprising first extraction means for extracting as luminance and first control means for controlling the exposure amount with reference to the extracted first maximum luminance.
An image pickup apparatus according to a fifth aspect of the invention includes an image pickup device that picks up a subject image and outputs an image pickup signal, and a first calculation unit that calculates a luminance corresponding to each of a plurality of photometry areas included in the image pickup area. And a second calculation means for calculating an exposure value based on a peak of the luminance calculated by the calculation means, and an exposure value based on the statistical average luminance is defined as Ev_mean, corresponding to the standard exposure at the statistical average luminance The luminance value to be used is Ymean, the maximum luminance value of the luminance is Ymax, the luminance value of the output image corresponding to the sensitivity reference point for standard exposure is Ym, and the luminance value corresponding to the maximum value of the output image is Ys. In this case, the second calculation means uses the following conditional expression to depend on the luminance value Ym and the luminance value Ys for converting the imaging signal into the output image, thereby exposing the exposure value with reference to the peak. Is calculated as Ev_peak.
Ev_peak = Ev_mean + log ₂ {(Ymax / Ymean) / (Ys / Ym)}

According to the present invention, the maximum brightness is extracted as the first maximum brightness among the brightnesses corresponding to the photometry areas other than the photometry area corresponding to the ultrahigh brightness of the predetermined brightness or higher, and the exposure amount is determined based on the first maximum brightness. Can be controlled.
Furthermore, according to the present invention, the exposure value based on the peak can be calculated using the following conditional expression.
Ev_peak = Ev_mean + log ₂ {(Ymax / Ymean) / (Ys / Ym)}

The figure explaining the principal part structure of the electronic camera in embodiment of this invention Block diagram of control system of electronic camera according to embodiment Block diagram explaining the image processing unit The figure which shows an example of the gamma curve used with the electronic camera in 1st Embodiment The block diagram explaining the exposure amount calculation part in embodiment The figure explaining an example when a super-high-intensity subject is contained in a field area Histogram showing the luminance distribution of the subject in the first embodiment The block diagram explaining the maximum brightness | luminance calculation part in 2nd Embodiment Histogram showing the luminance distribution of the subject in the second embodiment

-First embodiment-
A camera according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a main configuration of the electronic camera 100. An interchangeable lens 200 including a photographing lens L1 and a diaphragm 201 is detachably mounted on the body of the electronic camera 100. On the body side of the electronic camera 100, a quick return mirror 101, a focusing screen 102, a pentaprism 103, a photometric sensor 104, a photometric lens 105, a shutter 106, an image sensor 107, an eyepiece lens 108, and a display unit 120 are provided.

  FIG. 2 is a block diagram of a control system of the electronic camera 100 to which the interchangeable lens 200 is attached. In FIG. 2, the components shown in FIG. The control system of the electronic camera 100 includes a photometric sensor 104, a shutter 106, an image sensor 107, a control circuit 117, a display unit 120, an operation unit 121, and a memory card interface 122.

  Referring to FIG. 1, subject light that has passed through the interchangeable lens 200 and entered the electronic camera 100 is guided upward by a quick return mirror 101 positioned as indicated by a solid line in FIG. 1 before the shutter release. An image is formed on the focusing screen 102. The subject light further enters the pentaprism 103. The pentaprism 103 guides the incident subject light to the eyepiece lens 108 and causes the subject light to enter the photometric sensor 104 via the photometric lens 105.

  The photometric sensor 104 is disposed at a position optically equivalent to the imaging element 107 with respect to the interchangeable lens 200. The photometric sensor 104 is configured so as to be able to perform well-known divided photometry capable of measuring light by dividing a subject field area to be measured into a plurality of areas. The photometric sensor 104 includes an image sensor 104a (FIG. 5) and an A / D conversion circuit 104b (FIG. 5). The imaging element 104a is a photoelectric conversion element such as a CCD or CMOS that captures a subject image formed on the imaging surface and outputs a photoelectric conversion signal corresponding to the brightness of the subject image. The A / D conversion circuit 104b converts the photoelectric conversion signal output from the image sensor 104a into a digital photometry signal and outputs the digital photometry signal to the control circuit 117. The photometric sensor 104 according to the present embodiment is assumed to have 100 or more pixels in the vertical and horizontal directions, that is, several hundred pixels or more (for example, about QVGA). In addition, R (red), G (green), and B (blue) color filters are provided on the imaging surface of the imaging element 104a so as to correspond to the pixel positions. Since the image sensor 104a captures a subject image through the color filter, the image signal output from the image sensor 104a has RGB color system color information.

  After the release, the quick return mirror 101 is rotated to a position indicated by a broken line in FIG. 1, and subject light is guided to the image sensor 107 through the shutter 106, and a subject image is formed on the imaging surface. The image sensor 107 is a photoelectric conversion element such as a CCD or a CMOS that converts received light of an object into an image signal corresponding to its intensity. The image signal output from the image sensor 107 is converted into a digital image signal by an A / D conversion circuit (not shown) and the like and input to the control circuit 117. Note that R (red), G (green), and B (blue) color filters are provided on the imaging surface of the imaging element 107 so as to correspond to the pixel positions, respectively. Since the image sensor 107 captures the subject image through the color filter, the image signal output from the image sensor 107 has color information of the RGB color system.

  The control circuit 117 is an arithmetic circuit that includes peripheral circuits such as a CPU, a ROM, and a RAM, controls each component of the electronic camera 100, and executes various data processing. The control circuit 117 functionally includes an exposure amount calculation unit 117a, an exposure control unit 117b, an image processing unit 117c, a display control unit 117d, and a recording control unit 117e. The exposure amount calculation unit 117a calculates the brightness of the subject based on the photometric signal output from the photometric sensor 104, and calculates the shutter speed and the aperture value. The exposure amount calculation unit 117a will be described in detail later. The exposure control unit 117b controls the driving of the shutter 106 and the driving of the aperture 201 based on the shutter speed and the aperture value calculated by the exposure amount calculating unit 117a. The aperture 201 is controlled by the exposure control unit 117b via an interface (not shown). This interface is provided for performing various types of information communication between the electronic camera 100 and the interchangeable lens 200.

  The image processing unit 117c performs image processing such as interpolation processing, color conversion processing, and white balance processing on the image signal input from the image sensor 107 to generate image data (RAW data). As shown in FIG. 3, the image processing unit 117c functionally includes a captured image memory 151, a gradation conversion unit 152, and a γ curve recording unit 153. The captured image memory 151 is a volatile memory that temporarily stores an image signal input from the image sensor 107. As will be described later, the gradation conversion unit 152 performs γ conversion processing on linear image data corresponding to an image signal to generate image data. The γ curve recording unit 153 records the γ curve for converting the input luminance (the luminance of the input image data) shown in FIG. 4 into an image output value in the LUT format (conversion LUT). When the gradation conversion unit 152 performs γ conversion processing on the linear image data, the conversion LUT is referred to. The γ curve shown in FIG. 4 is an index that converts, for example, the saturation level Ys of the input luminance into the pixel output value 255 and converts the luminance value (sensitivity reference point level) Ym corresponding to the standard exposure amount into the pixel value 118. It shall have characteristics. In general, this γ curve can be set to an arbitrary shape. When the shape of the γ curve is determined, the ratio of the saturation level Ys to the sensitivity reference point level Ym (= Ys / Ym) becomes a constant value. Determined.

  The display control unit 117d is a circuit that drives the display unit 120. The display unit 120 is a liquid crystal display panel, for example, and displays the display data created by the image processing unit 117c based on the image data recorded on the memory card 123 in the playback mode. The display unit 120 is configured to display a so-called live view image. The live view is a display form in which the image captured by the image sensor 107 is displayed on the display unit 120 in real time by flipping up the quick return mirror 10 before release.

  The recording control unit 117e generates an image file in which additional information such as header information is added to the image data generated by the image processing unit 117c, and records the image file in a memory card 123 described later.

  The memory card interface 122 is an interface to which the memory card 123 can be attached and detached. The memory card interface 122 writes image data to the memory card 123 and reads image data recorded on the memory card 123 based on the control of the recording control unit 117e. The memory card 123 is a semiconductor memory card such as a compact flash (registered trademark) or an SD card.

  The operation unit 121 is a switch that receives a user operation. The operation unit 121 includes a power switch, a release switch, a luminance setting switch 121a for setting a threshold for removing ultra-high luminance described later, a sensitivity setting switch 121b for setting ISO sensitivity, and the like.

Next, the exposure amount calculation process will be described with reference to the drawings.
As shown in FIG. 5, the exposure amount calculation unit 117 a includes a white balance adjustment unit (hereinafter referred to as a WB adjustment unit) 13, a pixel luminance value calculation unit 14, a predetermined luminance setting unit 141, a super high luminance part removal unit 142, A conversion information creation unit 15, a normal photometric luminance calculation unit 16, a maximum luminance calculation unit 17, an ISO sensitivity setting unit 18, and an exposure value calculation unit 19 are provided.

  The WB adjusting unit 13 receives a photometric signal converted into a digital signal by the A / D conversion circuit 104b of the photometric sensor 104, and performs weighted addition of each color of R, G, and B on the photometric signal and corresponds to visibility. An image signal is generated. The pixel luminance calculation unit 14 calculates a luminance value according to the signal intensity of the image signal input from the WB adjustment unit 13. At this time, the pixel luminance calculation unit 14 refers to a conversion table that converts the signal intensity of each pixel into a luminance value. This conversion table is created by the conversion information creation unit 15. In the conversion table, different correction values are recorded for each pixel in accordance with the diffusibility of the focusing screen 102 and the F value and exit pupil position (PO value) of the photographic lens L1 when imaging is performed by the imaging element 104a. ing. This conversion table is created based on the results of experiments conducted under various conditions. Note that the F value and PO value of the photographic lens L1 are input to the exposure amount calculation unit 117a as lens information via an interface (not shown). This interface is provided for performing various types of information communication between the electronic camera 100 and the interchangeable lens 200 as described above.

  The predetermined luminance setting unit 141 sets a luminance threshold Yth. This luminance threshold value Yth is a predetermined value (for example, 56000 Cd / m ^ 2 if it is equivalent to Bv14), and is used when an ultrahigh luminance portion removing unit 142 described later removes an ultrahigh luminance pixel luminance value. It is done. Note that the luminance threshold Yth may be a value corresponding to the Bv value set by the user. In this case, the user operates the brightness setting switch 121a of the operation unit 121 to set, for example, a Bv value included in the range of Bv14 to Bv16. The predetermined luminance setting unit 141 may select a luminance threshold Yth corresponding to the set Bv value with reference to a table or the like recorded in advance in a predetermined memory (not shown).

  The super high luminance part removing unit 142 removes the super high luminance pixel luminance value equal to or higher than the above luminance threshold Yth from the luminance value (pixel luminance value) for each pixel calculated by the pixel luminance calculating unit 14. For example, as shown in FIG. 6 (a), when the field area includes an ultra-high brightness area such as the sun, the brightness is set such that the sun or the area Re including the sun and its immediate vicinity is removed. A threshold Yth is set. As a result, a high luminance region indicated by diagonal lines in the histogram of FIG. 6B, that is, a pixel luminance value equal to or higher than the luminance threshold Yth is removed.

  As will be described later, the normal photometric luminance calculation unit 16 uses a luminance value other than the luminance value removed by the super high luminance part removal unit 142 from the luminance value calculated by the pixel luminance calculation unit 14, and uses a known center weight. The normal photometric luminance value Ymean is calculated by photometry, multi-photometry, etc. (hereinafter referred to as normal photometry). The maximum luminance calculation unit 17 calculates a maximum luminance value Ymax from luminance values other than the luminance value removed by the super high luminance part removal unit 142 from the luminance value calculated by the pixel luminance calculation unit 14. The exposure value calculator 19 calculates a normal photometric exposure value Ev_mean based on the normal photometric luminance value Ymean calculated by the normal photometric luminance calculator 16. Further, the exposure value calculation unit 19 calculates a peak reference exposure value Ev_peak based on the normal photometric exposure value Ev_mean and the maximum luminance value Ymax calculated by the maximum luminance calculation unit 17. The ISO sensitivity setting unit 18 calculates the Sv value based on the operation of the ISO sensitivity setting switch 121b of the operation unit 121 by the user.

-Normal metering-
The normal photometric luminance calculation unit 16 calculates the normal photometric luminance Ymean using a method based on a statistical average luminance value such as known center-weighted photometry or multi-photometry as described above. The normal photometric luminance Ymean is a value corresponding to the standard reflection of the subject or a value corresponding to a reference close to the standard reflection. As described above, the normal luminance calculation unit 16 calculates a luminance value for each area (divided area) divided into a plurality of object areas of the photometric sensor 104. For example, when center-weighted photometry is used, the normal photometric luminance calculation unit 16 multiplies a luminance value corresponding to an area located at the center of the object field area among a plurality of divided areas by a predetermined weighting coefficient. Then, the normal photometric luminance calculation unit 16 obtains the normal photometric luminance Ymean by calculating the average of the luminance values of the entire field area.

  When multi-photometry is used, the normal photometric luminance calculation unit 16 calculates the average luminance value of the entire field area. Then, the normal photometric luminance calculation unit 16 follows a predetermined logic, for example, based on the average luminance value and the maximum luminance value of the luminance values of the divided areas, the average luminance value, the average luminance value, and the minimum luminance value. Is calculated as a normal photometric luminance value Ymean. Which of the above luminance values is used as the normal photometric luminance value Ymean depends on the size of the average luminance value and the luminance value of the divided region, the position of the divided region in the object field region, the maximum luminance value, and the maximum It is determined based on the difference between the luminance value and the minimum luminance value.

The exposure value calculator 19 calculates the exposure value Lv using the following exposure relational expression (1).
Av + Tv = Ev = Lv = Sv + Bv (1)

  Note that Sv is a value input from the ISO sensitivity setting unit 18, and the value of Sv is 5 when the ISO sensitivity setting switch 121 b is set to, for example, ISO 100 by the user. Bv is a value determined by the logarithm of luminance B (B = 3.4 × 2 ^ Bv). Av is a value determined by the logarithm of the F value (F = 1.4 ^ Av). Tv is a value determined by the logarithm of the exposure time T (T = 1/2 ^ Tv).

  The exposure value calculation unit 19 uses the Bv value determined corresponding to the normal photometric luminance Ymean and the Sv value input from the ISO sensitivity setting unit 18 to calculate the normal photometric exposure value Ev_mean (= Lv = Sv + Bv) is calculated.

-Highlight standard metering-
In highlight reference photometry, exposure control is performed so that the maximum luminance value of the input pixel becomes the saturation level Ys, that is, with reference to the peak of input luminance. The maximum luminance calculation unit 17 calculates (extracts) the maximum luminance value Ymax from the pixel luminance values from which the ultra high luminance is removed (excluded) based on the image signal corresponding to the photometric signal. The exposure value calculation unit 19 calculates the exposure value Ev_peak so that the maximum luminance value Ymax matches the saturation level Ys. As described above, since the shape of the γ curve recorded in the γ curve recording unit 153 is fixed, that is, the ratio (Ys / Ym) is fixed, the normal photometric exposure value Ev_mean and the peak reference exposure When the ratio to the value Ev_peak is R, the following relational expression (2) is established.
R = (Ymax / Ymean) / (Ys / Ym) = 2 ^ {(Ev_peak) / (Ev_mean)} (2)

In a subject having a wide luminance dynamic range, the relationship (Ymax / Ymean)> (Ys / Ym) is established. Therefore, in the above equation (2), the exposure amount ratio R is larger than 1, that is, (Ev_peak> Ev_mean). The relationship is established. Therefore, the exposure value calculation unit 19 calculates the peak reference exposure value Ev_peak so that the exposure value Ev of the subject having a wide dynamic dynamic range is large, that is, the exposure amount is reduced. The exposure value calculation unit 19 calculates the peak reference exposure value Ev_peak using the following relational expression (3) based on the above relational expression (2) based on the normal photometric luminance value Ymean and the normal photometric exposure value Ev_mean. To do.
Ev_peak = Ev_mean + log ₂ {(Ymax / Ymean)> (Ys / Ym)} (3)

  When the peak reference exposure value Ev_peak is calculated, the exposure value calculator 19 determines the aperture value and shutter speed, and controls the exposure controller 117a to drive the aperture 201 and the shutter 106. Then, an image signal is acquired by the image sensor 107 and stored in the captured image memory 153. The image processing unit 117c performs known interpolation processing and color conversion processing on the stored image signal to generate linear image data of the R plane, the G plane, and the B plane. Then, the luminance plane image data is synthesized with the luminance Y (= αR + βG + γB) by the image processing unit 117c. That is, the tone conversion unit 152 refers to the conversion LUT recorded in the γ curve recording unit 153 and performs γ conversion processing on the linear image data using the γ curve shown in FIG. As a result, image data in which the maximum luminance value Ymax is associated with the saturation level Ys (the image output value 255 for an 8-bit image) is obtained.

  This will be described with reference to the luminance frequency distribution (histogram) shown in FIG. FIG. 7A shows a histogram of a subject with a narrow luminance dynamic range, and FIG. 7B shows a histogram of a subject with a relatively wide luminance dynamic range. FIG. 7C shows a histogram of luminance plane image data corresponding to a subject with a narrow luminance dynamic range, and FIG. 7D shows a histogram of luminance plane image data corresponding to a subject with a relatively wide luminance dynamic range. Show. In the histograms shown in FIGS. 7C and 7D, the maximum luminance value of the luminance plane image data is represented by “4095”.

  The frequency peak P1 in the histogram of FIG. 7A corresponds to the frequency peak P4 in the histogram of FIG. That is, the luminance gradation of the subject is stored in the image data. Moreover, the frequency peaks P2 and P3 in the histogram of FIG. 7B correspond to the frequency peaks P5 and P6 in the histogram of FIG. 7D, respectively. Further, in FIGS. 7C and 7D, the maximum luminance value Ymax of the subject corresponds to the maximum luminance value “4095” of the luminance plane image data. Therefore, high luminance gradation can be preserved even for a subject having a wide luminance dynamic range.

  The display control unit 117d causes the display unit 120 to display an image corresponding to the image data generated as described above. Further, the recording control unit 117e causes the memory card 123 to record the image data generated as described above via the memory card interface 122.

According to the electronic camera of the first embodiment described above, the following operational effects can be obtained.
The pixel luminance value calculation unit 14 calculates the luminance corresponding to each of a plurality of photometry areas included in the imaging region by multi-photometry, and the ultra-high luminance part removal unit 142 exceeds the predetermined luminance exceeding the predetermined luminance. In the case of high luminance, pixels corresponding to super high luminance are excluded as the super high luminance region. Then, the maximum luminance calculation unit 17 extracts the maximum luminance value Ymax from the luminances corresponding to the pixels other than the super high luminance region excluded by the super high luminance part removing unit 142, and the exposure value calculation unit 19 The exposure amount was controlled based on the value Ymax. Therefore, the super-brightness such as the sun can be excluded from the photometric object, and the exposure amount can be controlled based on the maximum luminance value for the remaining areas in the object field region. Image data that preserves the gradation of luminance can be acquired.

-Second Embodiment-
An electronic camera 100 according to a second embodiment of the present invention will be described with reference to the drawings. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be mainly described. Points that are not particularly described are the same as those in the first embodiment. In the present embodiment, when an image of a high-brightness subject close to a point light source or a specular reflection point is included in the imaging angle of view in addition to a super-bright subject such as the sun, a slight whiteout is allowed and the luminance is reduced. It differs from the first embodiment in that a saturation level is set.

  As shown in FIG. 8, the maximum luminance calculation unit 17 includes a histogram creation unit 20 and an allowable whiteout ratio setting unit 21. The histogram creation unit 20 creates a histogram based on the photometric signal input from the photometric sensor 104. In this histogram, the horizontal axis represents the luminance value of the pixel, and the vertical axis represents the frequency. The allowable whiteout ratio setting unit 21 sets a value of whiteout ratio δ (for example, a fixed value such as 0.01%). Note that the value of the whiteout ratio δ may be set by the user. In this case, the user operates the operation unit 121 to set the value of the whiteout ratio δ.

  The maximum brightness calculation unit 17 calculates the corrected maximum brightness value Ymax_h using the histogram created by the histogram creation unit 20 and the whiteout ratio δ set by the whiteout ratio setting unit 21. That is, the maximum luminance calculation unit 17 selects pixels corresponding to the frequency obtained by multiplying the sum of the frequencies of all the pixels other than the pixels removed by the super high luminance unit removing unit 142 by the whiteout ratio δ in descending order of the luminance value. Excluded as a high brightness area. Then, the maximum luminance calculation unit 17 calculates the maximum luminance value among the luminance values of the remaining pixels that are not excluded as the corrected maximum luminance value Ymax_h. FIG. 9B shows the relationship between the maximum luminance value Ymax and the corrected maximum luminance value Ymax_h. The area represented by the oblique lines in FIG. 9B indicates pixels that are excluded according to the whiteout ratio δ. When the whiteout ratio δ is 0, the corrected maximum luminance value Ymax_h and the maximum luminance value Ymax are equal.

  The exposure value calculator 19 calculates the peak reference exposure value Ev_peak by replacing the maximum luminance value Ymax with the corrected maximum luminance value Ymax_h in the relational expression (3) described in the first embodiment. Thereafter, similarly to the first embodiment, the exposure value calculation unit 19 determines the aperture value and the shutter speed, and the exposure control unit 117a controls the driving of the aperture 201 and the shutter 106. As a result, the histogram of luminance plane image data corresponding to a subject with a relatively wide luminance dynamic range is a histogram as shown in FIG. That is, the corrected maximum luminance value Ymax_h corrected according to the whiteout ratio δ is associated with the saturation level Ys shown in FIG.

According to the electronic camera of the second embodiment described above, the following functions and effects can be obtained in addition to the functions and effects obtained by the electronic camera of the first embodiment.
The maximum brightness calculation unit 17 excludes pixels corresponding to high brightness as a high brightness area based on the maximum brightness value Ymax and the white skip ratio δ, and excludes pixels other than the high brightness area excluded based on the white skip ratio δ. The maximum luminance among the luminances corresponding to the pixels is extracted as the corrected maximum luminance value Ymax_h. The exposure value calculation unit 19 controls the exposure amount based on the corrected maximum luminance value Ymax_h. Therefore, by calculating the exposure amount based on a slight light intensity regularly reflected by a point light source, for example, a car bumper or the like, it is possible to prevent the image from appearing as an undertone as a whole.

  The electronic camera 100 in the first and second embodiments described above can be modified as follows.

(1) The exposure amount calculation unit 117a may not include the predetermined luminance setting unit 141 and the super high luminance part removing unit 142. In this case, the maximum luminance calculation unit 17 calculates the maximum luminance value Ymax using the luminance calculated by the pixel luminance value calculation unit 14, and the exposure value calculation unit 19 uses the above-described equation (3) to calculate the peak reference value. The exposure value Ev_peak may be calculated.

(2) The exposure value calculation unit 117a may calculate the exposure value using the image signal from the image sensor 107 instead of calculating various exposure values using the photometry signal from the photometry sensor 104. Good. As a result, even when the live view mode is set, that is, when the quick return mirror 101 is rotated to the position indicated by the broken line in FIG. 1, the exposure value calculation unit 117a can calculate the exposure value. It becomes.

  In addition, the present invention is not limited to the above-described embodiment as long as the characteristics of the present invention are not impaired, and other forms conceivable within the scope of the technical idea of the present invention are also within the scope of the present invention. included. The embodiments and modifications used in the description may be configured by appropriately combining them.

16 Normal photometric luminance calculation unit, 17 Maximum luminance calculation unit, 19 Exposure value calculation unit,
104 photometric sensor, 117a exposure amount calculation unit, 121 operation unit,
141 Predetermined luminance setting unit, 142 Ultra-high luminance unit removing unit

Claims (5)

Calculating means for calculating the luminance corresponding to each of the plurality of photometric areas included in the imaging area;
A first excluding unit that excludes the photometric area corresponding to the ultra-high brightness as an ultra-high brightness area when the calculated brightness is an ultra-high brightness of a predetermined brightness or higher;
First extraction means for extracting the maximum brightness among the brightnesses corresponding to the photometric areas other than the ultra-high brightness area excluded by the first exclusion means as first maximum brightness;
An imaging apparatus comprising: a first control unit configured to control an exposure amount based on the extracted first maximum luminance. The imaging device according to claim 1,
Second exclusion means for excluding the photometric area corresponding to high brightness as a high brightness area based on the first maximum brightness and a predetermined exclusion rate;
Second extraction means for extracting the maximum brightness among the brightness corresponding to the photometric areas other than the high brightness area excluded by the second exclusion means as second maximum brightness;
An image pickup apparatus, further comprising: a second control unit that controls an exposure amount on the basis of the extracted second maximum luminance. The imaging device according to claim 1 or 2,
An imaging apparatus, further comprising a first operation member for receiving an operation for setting the predetermined exclusion rate. In the imaging device according to any one of claims 1 to 3,
An imaging apparatus, further comprising: a setting unit having a second operation member for receiving the setting operation of the predetermined luminance. An image sensor that captures a subject image and outputs an image signal;
First calculating means for calculating luminance corresponding to each of a plurality of photometric areas included in the imaging area;
Second calculating means for calculating an exposure value based on a peak of the luminance calculated by the calculating means;
Let Ev_mean be the exposure value based on the statistical average brightness,
The luminance value corresponding to the standard exposure at the statistical average luminance is Ymean,
The maximum luminance value among the luminances is Ymax,
The luminance value of the output image corresponding to the sensitivity reference point for the standard exposure is Ym,
When the luminance value corresponding to the maximum value of the output image is Ys, the second calculation means uses the following conditional expression to convert the imaging signal into the output image, the luminance value Ym and the luminance value. An imaging apparatus characterized by calculating the exposure value based on the peak as Ev_peak by making it depend on Ys.
Ev_peak = Ev_mean + log ₂ {(Ymax / Ymean) / (Ys / Ym)}

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