JP2021019314A - Image processing apparatus, control method thereof, and program - Google Patents

Abstract

To allow users to adjust an exposure adjustment when capturing video in consideration of a luminance range of a monitor for viewing.SOLUTION: An image processing apparatus is configured to present information to a user for adjusting an exposure of an imaging unit. The image processing apparatus includes: a detection unit configured to detect a representative luminance value of a bright portion and a dark portion on the basis of a luminance distribution of image data imaged and obtained by an imaging unit on the basis of initial exposure setting; a setting unit configured to set a display dynamic range indicating a luminance range of a target display apparatus; a comparator unit configured to compare an input dynamic range indicating a luminance range when being imaged by the imaging unit with the display dynamic range; and a processing unit configured to determine, on the basis of a comparison result of the comparator unit, an adjustable range of the exposure by using the representative luminance value of the bright portion and the dark portion detected by the detection unit, and to present a user interface for adjusting the exposure within the determined range.SELECTED DRAWING: Figure 3

Description

The present invention relates to a technique for adjusting exposure at the time of imaging.

In an HDR (High Dynamic Range) video signal system such as ITU-R BT.2100 (Non-Patent Document 1), which has been proposed in recent years, the gradation of a high-luminance portion can be reproduced with a contrast close to the appearance of the subject. On the other hand, the reproducible luminance gradation may change depending on the peak luminance of the output monitor. Therefore, when shooting and developing an HDR video signal with a camera, if it is possible to check how the subject being shot is reproduced on the final viewing monitor, the user's drawing intention is reflected. It will be easier to make. Conventionally, as an exposure determination method for an image processing device compatible with HDR, a method of determining a reference exposure at the time of shooting has been proposed based on an absolute luminance value obtained by converting a representative luminance value in an image based on the input / output characteristics of an output device. (For example, Patent Document 1).

JP-A-2018-56702

Recommendation ITU-R BT.2100-2 (07/2018)

In Patent Document 1, when the user wants to change the reference exposure according to the dynamic range of the shooting scene or the drawing intention, it is grasped which exposure range is appropriately reproduced in the brightness reproduction range of the final output monitor. You can't. Also, in order to confirm the appropriate exposure setting value, even when taking exposure bracketing shots, if the brightness range of the in-camera display device is different from the brightness range reproducible on the ornamental output monitor, shooting is in progress. It is difficult to confirm whether the camera settings are appropriate from the displayed image of.

The present invention is intended to provide a technique for allowing a user to adjust the exposure in consideration of the brightness range of an ornamental monitor when shooting an image.

In order to solve this problem, for example, the image processing apparatus of the present invention has the following configuration. That is,
An image processing device that presents information to the user for adjusting the exposure of the imaging means.
A detection means that detects representative brightness values of bright and dark areas based on the brightness distribution of image data obtained by imaging with the imaging means based on the initial exposure setting.
A setting means for setting a display dynamic range that represents the brightness range of the target display device, and
A comparison means for comparing the input dynamic range representing the brightness range imaged by the imaging means with the display dynamic range, and
Based on the comparison result of the comparison means, the adjustable range of the exposure is determined using the representative luminance values of the bright and dark areas detected by the detection means, and the user interface for adjusting the exposure in the determined range. It has a processing means for presenting.

According to the present invention, when a user shoots an image, the exposure can be adjusted in consideration of the brightness range of an ornamental monitor.

The block block diagram of the image processing apparatus of embodiment. The flowchart which shows the processing procedure of the image processing apparatus of embodiment. The flowchart which shows the processing procedure of the exposure adjustment range determination part. The figure for demonstrating the processing content of the exposure compensation range determination part. The figure for demonstrating the processing content of the exposure compensation range determination part. The figure for demonstrating the processing content of the exposure compensation range determination part. The figure which shows the display example of the user interface of exposure compensation. A histogram showing the brightness distribution of the input image.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiment, not all of the plurality of features are essential to the invention, and the plurality of features may be arbitrarily combined. Further, in the attached drawings, the same or similar configurations are designated by the same reference numbers, and duplicate description is omitted.

[First Embodiment]
The present embodiment relates to an image processing apparatus that records an image having a wide dynamic range by performing development processing corresponding to an HDR standard such as ITU-R BT.2100 and encoding a video signal on a captured image. Therefore, it is assumed that the video signal captured and developed by this image processing device is reproduced and displayed on an external monitor compatible with the HDR standard. Further, it is assumed that the brightness reproduction range of the internal display unit (rear liquid crystal panel, electronic viewfinder, etc.) for confirming an image during shooting by the image processing device may be different from that of the external monitor.

FIG. 1 is a block configuration diagram of an image processing apparatus according to an embodiment, and shows a configuration when applied to an imaging apparatus.

In FIG. 1, the optical system 101 includes a lens group composed of a zoom lens and a focus lens, an aperture adjusting device, and a shutter device. The optical system 101 adjusts the magnification, focus position, or amount of light of the subject image imaged on the image sensor 102. The image sensor 102 is composed of a photoelectric conversion element such as a CCD or a CMOS sensor, and photoelectrically converts the luminous flux of the imaged subject that has passed through the optical system 101 into an electric signal and outputs the light flux. The A / D conversion unit 103 converts the video signal per pixel input from the image sensor 102 into a digital image with a predetermined number of bits (for example, 14 bits) and outputs the digital image.

The image processing unit 104 performs development processing on the output signal from the A / D conversion unit 103. Specifically, the image processing unit 104 performs development processing including noise suppression, demosaic, gradation conversion, color correction, contour compensation, etc. on the signal from the A / D conversion unit 103, and performs a luminance signal, a color signal, and the like. To generate. Further, the image processing unit 104 can perform the same image processing not only on the signal output from the A / D conversion unit 103 but also on the image data read from the recording unit 110.

The input image analysis unit 105 analyzes the signal level of the input image and generates an evaluation value for controlling the control parameters of the optical system 101, the image pickup unit 102, and the image processing unit 104.

The assumed luminance reproduction range determination unit 106 determines the luminance range that can be reproduced when the HDR-compatible video signal recorded by the image processing apparatus is displayed on an external monitor as a user's target.

The exposure adjustment range determination unit 107 determines an exposure adjustable range for the scene being photographed based on the determination result of the assumed luminance reproduction range determination unit 106 and the evaluation value of the analysis result from the input image analysis unit 105. To do.

The display processing unit 109 functions as an electronic viewfinder (EVF) by sequentially displaying the video signal output from the image processing unit 104 on a display member such as a liquid crystal panel. The recording processing unit 108 has a function of recording a video signal output from the image processing unit 104, and may include, for example, an information recording medium such as a memory card equipped with a semiconductor memory. The user instruction unit 110 includes a touch panel and buttons, and is a user interface for the user to specify processing contents of the image processing device such as exposure setting and development setting.

The system control unit 111 includes a CPU, a ROM in which a program executed by the CPU is stored, and a RAM that functions as a work area of the CPU. Then, the system control unit 111 is connected to each processing unit of the image processing device of the embodiment, and controls the operation of the entire image processing device via the image signal and the control signal.

Next, the processing flow of the image processing apparatus of this embodiment will be described with reference to the flowchart of FIG.

In S100, the system control unit 111 determines the input dynamic range of the image processing device.

Here, the input dynamic range indicates the brightness range of the subject that can be acquired and reproduced by the image sensor 102. The lower limit value Cmin (nits or cd / m ² ) of the input dynamic range corresponds to a state in which no light enters the image sensor 102, and Cmin = 0 is always set regardless of the dynamic range setting. The upper limit of the input dynamic range, Cmax (nits or cd / m ² ), corresponds to the subject brightness at which the image sensor saturates. Further, in the present embodiment, it is assumed that the brightness of a subject having a reflectance of 100% is 100 nits. For example, it is assumed that there are three dynamic range settings, and the subject brightness level at which the image sensor is saturated is one of Cmax = {200nits, 400nits, 800nits}.

The input dynamic range is set by the user according to the dynamic range of the scene to be photographed, or is automatically set by the image processing device based on the analysis result of the input image analysis unit 105. When the input dynamic range is set, the system control unit 111 sets the aperture of the optical system 101, the shutter speed, and the ISO sensitivity of the image sensor 102 so that the image sensor 102 is saturated at a saturation level corresponding to the input dynamic range. Do.

In S101, the system control unit 111 controls the assumed luminance reproduction range determination unit 105 based on the user's instruction to set the assumed luminance reproduction range.

Specifically, the maximum brightness value Dmax (nits or cd / m ² ) and the minimum brightness value Dmin (nits or cd / m ² ) of the display dynamic range of the output monitor for viewing finally assumed by the user, and the above output. Set the HDR signal encoding method (PQ (Perceptual Quantization), HLG (Hybrid Log-Gamma), etc.) supported by the monitor.

The maximum luminance value Dmax, the minimum luminance value Dmin, and the encoding method referred to here are set by the user operating the user instruction unit 110. However, information for identifying various monitors (for example, manufacturer name, model name), maximum brightness value Dmax, minimum brightness value Dmin, (in some cases, the minimum brightness value Dmin) of the storage device such as ROM of the system control unit 111. Further, the encoding method) may be stored as a table in advance, and the user may select one of them from the user instruction unit 110. Further, the information may be acquired from the network via a communication unit (not shown). If the user does not set the final output monitor, the system control unit 111 sets the initial value. As an example, it is assumed that the information that the maximum brightness Dmax = 600nits, the minimum brightness Dmin = 0nits, and the HDR signal encoding method is PQ is set in the assumed brightness reproduction range setting unit.

In S102, the system control unit 111 controls the optical system 101 and the image sensor 102, and starts shooting to start capturing an image.

In S103, the system control unit 111 controls the input image analysis unit 105, analyzes the signal level of the image output from the A / D conversion unit 103, and causes the dynamic range of the shooting scene to be calculated by the following procedure.

First, the input image analysis unit 105 divides the input image into a plurality of block areas and calculates the average luminance value of each block. Then, the input image analysis unit 105 creates a luminance histogram as shown in FIG. 8 based on the calculated average luminance value. Next, the input image analysis unit 105 refers to the created luminance histogram, and refers to the representative luminance value Smax (nits or cd / m ² ) of the bright part of the shooting scene and the representative luminance value Smin (nits or cd) of the dark part of the shooting scene. Find / m ² ) and set the difference between Smax and Smin to the dynamic range of the shooting scene. Further, Smax is the average luminance value of the upper luminance region LH in the luminance histogram, and Smin is the average luminance value of the lower luminance region LL in the luminance histogram. A predetermined range shall be set in advance for LH and LL. Specifically, let LH be the average luminance value of the upper 10% of the distribution shown by the luminance histogram, and LL be the average luminance value of the lower 10%. It should be understood that the value of 10% shown here is just an example. This is because the user may appropriately set or select from the user instruction unit 110.

In the above, the representative brightness Smin and Smax are detected from the shooting scene, but the area desired by the user in the shooting scene (for example, the face of a person) is set and obtained from the image in the set area. Is also good.

In S104, the system control unit 111 controls the exposure adjustment range determination unit 107, refers to the output of the assumed luminance reproduction range determination unit 106 and the input image analysis unit 105, and allows the exposure to be adjusted in the scene being photographed. To decide. Then, the exposure is adjusted within that range, and the imaging process is performed.

In S105, the system control unit 111 controls the image processing unit 104 to perform development processing on the output signal of the A / D conversion unit 103.

In S106, the system control unit 111 controls the display processing unit 109 and the recording processing unit 108 to perform processing related to display and recording in response to the output signal of the image processing unit 104. The display processing unit 109 displays ancillary information such as an optical system of an image pickup device at the time of shooting, an image sensor, development settings, and a histogram showing the characteristics of the image in association with the output image of the development processing unit 104. The recording processing unit 108 records the output image of the developing processing unit 104 in association with the incidental information during shooting.

Here, the maximum brightness that can be displayed by the display processing unit 109 may be lower than the maximum brightness of the external monitor that generates the video signal captured and developed by the image processing device.

This is because the devices of the external monitor and the display processing unit 109 are different, and in order to reduce power consumption, the display processing unit 109 is controlled to reduce the display brightness during the imaging operation. There is. Under such conditions, it becomes difficult for the user to determine whether or not the exposure can be set while visually recognizing the image of the development result displayed on the display processing unit 109 during imaging. Therefore, in the present embodiment, in the exposure adjustment range determination unit 107, the user can change the exposure setting with respect to the reference exposure set at the time of shooting in consideration of the brightness display performance of the final output monitor and the HDR signal encoding method. Calculate the range and determine the information to display.

Next, referring to the flowchart of FIG. 3 and the schematic views of FIGS. 4, 5, and 6, the processing content of the exposure adjustment range determination unit 107 under the control of the system control unit 111, which is a feature of the present embodiment. Will be described.

Note that FIGS. 4, 5 and 6 are schematic views showing an example of the magnitude relationship between the input dynamic range, the assumed luminance reproduction range, and the luminance distribution information of the shooting scene.

In FIG. 3, in S200, S201, and S202, the exposure adjustment range determining unit 107 uses the input dynamic range Cmin, Cmax of the image processing device, the assumed luminance reproduction range Dmin, Dmax, and HDR signal of the final output monitor, and captures the image. Enter the brightness distribution information Smin, Smax, of the scene.

In S203, the exposure adjustment range determination unit 107 determines the reference level Save (nits or cd / m2) for exposure adjustment with reference to the brightness analysis result of the input image. The reference value for exposure adjustment may be an average luminance value in a predetermined region in the center of the input image, or may be an average luminance value in a rectangular region in the image selected by the user.

In S204 to S209, the exposure adjustment range determination unit 107 determines the exposure adjustment range based on the assumed luminance reproduction range, the input dynamic range, the HDR signal encoding method, and the luminance distribution information of the shooting scene.

First, in S204, the exposure adjustment range determination unit 107 compares the assumed luminance reproduction range with the input dynamic range, and if the assumed luminance reproduction range is equal to or greater than the input dynamic range, the process proceeds to S205. If the assumed luminance reproduction range is less than the input dynamic range, the exposure adjustment range determination unit 107 advances the process to S206.

In S205, the exposure adjustment range determination unit 107 calculates the exposure adjustment amounts ΔEV + and ΔEV- by the equations (1) and (2) so that the brightness distribution of the shooting scene does not exceed the input dynamic range.

Here, ΔEV + indicates the upper limit correction amount (nits or cd / m ² ) that can positively correct the exposure with respect to the reference level Save of the exposure adjustment determined in S203. Further, ΔEV- indicates the lower limit correction amount (nits or cd / m ² ) that can negatively correct the exposure with respect to the reference level Save of the exposure adjustment determined in S203.

As shown in the schematic diagram of FIG. 4, the difference between the representative luminance value Smin of the dark part of the shooting scene and the minimum luminance level Cmin that can be output by the image sensor 102 is ΔEV−. Further, the difference between the representative brightness value Smax of the bright part of the shooting scene and the maximum brightness level Cmax that can be output by the image sensor 102 is ΔEV + ΔEV- = Smin --Cmin ... (1)
ΔEV + = Cmax --Smax… (2)

In S206 and S208, the exposure adjustment range determination unit 107 switches the exposure adjustment range setting method according to the HDR signal encoding method.

The exposure adjustment range determination unit 107 branches the process to S207 when the HDR signal encoding method is the PQ method, S209 when the HDR signal encoding method is HLG, and S205 in other cases.

In the HDR signal encoding method, the PQ method is the method described in Non-Patent Document 1 (p.5 TABEL4 Reference PQ OETF), and the HLG method is the non-patent Document 1 (p.6 TABLE5 HLG Reference OETF). It is the encoding method described in. As another method, a log format encoding method is assumed as an example, but other encoding methods may be used.

In S207, the exposure adjustment range determination unit 107 determines the exposure adjustment range when the HDR signal encoding method is PQ.

Since the PQ method encodes the brightness of the scene in association with the absolute brightness of the monitor display, if the image processing device shoots and develops the brightness distribution of the shooting scene so that it falls within the brightness range of the output monitor. , Can be reproduced correctly when displayed on a monitor.

Therefore, the upper limit value ΔEV + and the lower limit value ΔEV- of the exposure adjustment amount are determined by the equations (3) and (4) so that the brightness distribution of the shooting scene does not exceed the assumed brightness reproduction range.

ΔEV + indicates the upper limit correction amount (nits or cd / m ² ) that can positively correct the exposure with respect to the reference level Save of the exposure adjustment determined in S203. Further, ΔEV- indicates a lower limit correction amount (nits or cd / m2) capable of negatively correcting the exposure with respect to the reference level Save of the exposure adjustment determined in S203.
ΔEV- = Smin --Dmin… (3)
ΔEV + = Dmax --Smax… (4)

As shown in the schematic diagram of FIG. 5, the difference between the representative brightness value Smin of the dark part of the shooting scene and the minimum brightness level Dmin reproducible on the ornamental output monitor is ΔEV-. Further, in S209 and S210 where the difference between the representative brightness value Smax of the bright part of the shooting scene and the maximum brightness level Dmax reproducible on the ornamental output monitor is ΔEV +, the exposure adjustment range determination unit 107 is an HDR signal. Determines the exposure adjustment range when the encoding method of is HLG.

The HLG method encodes the maximum brightness of the scene brightness relative to the maximum brightness of the monitor display. Therefore, when the upper limit brightness value of the output monitor for viewing is lower than the input dynamic range of the image processing device, the subject in the brightness range from the dark part to the middle may become dark.

Therefore, in S209, the exposure adjustment range determining unit 107 corrects the luminance value of the shooting scene by applying a predetermined gain k (ΔL) according to the difference between the input dynamic range and the assumed luminance reproduction range.

In FIG. 6, the representative brightness value Smin of the dark part, the representative brightness value Smax of the bright part, and the reference exposure Save of the shooting scene are exposed and compensated, which are Smin', Smax', and Save'.

ΔL is obtained according to Equation (5) using the upper limit of the input dynamic range (maximum luminance level Cmax that can be output by the imaging unit) and the maximum luminance level Dmax that can be reproduced by the ornamental output monitor. The correction gain k is obtained according to the equation (6) using a predetermined coefficient α.
ΔL = Dmax --Cmax… (5)
k = ΔL ^α … (6)

Even in the case of the HLG method, if the image processing device shoots and develops the brightness distribution of the shooting scene after exposure compensation so as to be within the brightness range of the output monitor, it can be correctly reproduced at the time of display on the monitor.

Therefore, in S210, the exposure adjustment range determination unit 107 adjusts the exposure by the equations (7) and (8) so that the brightness distribution information Smin'and Smax' of the shooting scene after the exposure compensation does not exceed the assumed brightness reproduction range. The upper limit value ΔEV + and the lower limit value ΔEV- of the amount are determined.

ΔEV + indicates the upper limit correction amount (nits or cd / m ² ) that can positively correct the exposure with respect to the reference level Save'of the exposure adjustment determined in S209. ΔEV-indicates the lower limit correction amount (nits or cd / m ² ) capable of negatively correcting the exposure with respect to the reference level Save'of the exposure adjustment determined in S209.
ΔEV- = Smin'-Dmin'… (7)
ΔEV + = Dmax --Smax'… (8)

As shown in the schematic diagram of FIG. 6, the difference between the representative brightness value Smin'of the dark part of the shooting scene after the reference exposure compensation and the minimum brightness level Dmin that can be reproduced by the ornamental output monitor is ΔEV-. In addition, the difference between the representative brightness value Smax'of the bright part of the shooting scene after the reference exposure compensation and the maximum brightness level Dmax that can be reproduced on the ornamental output monitor is ΔEV +, and the exposure compensation amount determination unit 107 Ends the processing of.

The system control unit 111 presents the user interface or information related to the exposure adjustment range calculated by the exposure adjustment range determination unit 107 together with the development result via the display processing unit 109. Here, FIG. 7 shows an example of the display of the user interface presented by the display processing unit 109.

In FIG. 7, reference numeral 750 indicates a screen displayed by the display processing unit 109. Reference numeral 751 indicates an input image captured. The rectangular area 700 indicates a reference subject area when adjusting the exposure in the input image, and a slider icon indicating the reference exposure level and the range in which the exposure can be adjusted is drawn at the lower part of the image display screen.

Reference numeral 701 indicates the average luminance value of the rectangular region 700. Reference numeral 702 is a bar indicating the width of the brightness distribution of the shooting scene, and reference numeral 703 (the range of the arrows on both ends) is an exposure adjustment range (ΔEV-) that can be reproduced by the final output monitor calculated by the exposure adjustment range determination unit. ~ ΔEV +) is shown. As described above, the exposure adjustment range 703 is determined in consideration of the reproduction range of the final output monitor, and is a range different from the range of the exposure amount that the image processing apparatus can adjust according to its specifications.

When the user performs an operation to adjust the exposure, the brightness distribution width bar 702 moves left and right, which serves as a guide for the user's exposure adjustment. The bar 702 can only be moved within the exposure adjustment range 703.

In the present embodiment, the bar 702 can be adjusted only within the exposure adjustment range 703, but the bar 702 may be adjusted beyond the range. This is because even if overexposure or underexposure occurs in a part of the area, it may be desired to set the desired exposure. At this time, in addition to the display showing, for example, the bar 702 and the exposure adjustment range 703, an exposure range that can be adjusted according to the specifications of the image processing apparatus (for example, -3 steps to +3 steps) may be displayed. That is, on the screen of FIG. 7, it is sufficient that the user can recognize whether the current exposure setting can be reproduced on the final output monitor.

As described above, the exposure adjustment range 703 is different based on the results of the processes described with reference to FIGS. 3 to 6. That is, even when the same scene is shot with the same input dynamic range, the exposure adjustment range 703 may be in a different range if the final output monitors are different.

Further, the processing by the exposure adjustment range determination unit 107 is performed every time the imaging operation is updated in the imaging unit 102, but the display of the exposure adjustment range by the display processing unit 109 is performed by the assumed brightness reproduction range determination unit 106. It is assumed that the setting of is updated, the brightness distribution of the shooting scene changes significantly, or the setting is updated at a predetermined frame interval.

In the above configuration, when the user operates the bar 702, the exposure related to the imaging is determined according to the operation. Then, when the user performs an operation related to imaging, an image capable of reproducing high gradation on the monitor desired by the user can be obtained.

As described above, according to the present embodiment, when generating a video signal corresponding to the HDR standard, the user adjusts the exposure based on the assumed luminance reproduction range of the final output monitor and the signal level of the input image. You can grasp the range and adjust the exposure.

(Other Examples)
In the above embodiment, the video signal corresponding to the HDR standard has been described, but the video signal is not necessarily limited to the HDR standard. The present invention can be applied when there is a difference between the dynamic range of the image obtained by imaging and the dynamic range supported by the final display device.

The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

The invention is not limited to the above embodiments, and various modifications and modifications can be made without departing from the spirit and scope of the invention. Therefore, a claim is attached to make the scope of the invention public.

101 ... Optical system, 102 ... Imaging unit, 103 ... A / D conversion unit, 104 ... Image processing unit, 105 ... Input image analysis unit, 106 ... Assumed brightness reproduction range determination unit, 107 ... Exposure adjustment range determination unit, 108 ... Recording processing unit, 109 ... Display processing unit, 110 ... User instruction unit, 111 ... System control unit

Claims (9)

An image processing device that presents information to the user for adjusting the exposure of the imaging means.
A detection means that detects representative brightness values of bright and dark areas based on the brightness distribution of image data obtained by imaging with the imaging means based on the initial exposure setting.
A setting means for setting a display dynamic range that represents the brightness range of the target display device, and
A comparison means for comparing the input dynamic range representing the brightness range imaged by the imaging means with the display dynamic range, and
Based on the comparison result of the comparison means, the adjustable range of the exposure is determined using the representative luminance values of the bright and dark areas detected by the detection means, and the user interface for adjusting the exposure in the determined range. An image processing apparatus having a processing means for presenting the above. The processing means
When the comparison result of the comparison means indicates that the display dynamic range is the same as or wider than the input dynamic range, the range indicated by the input dynamic range is determined as the adjustable range of exposure. The image processing apparatus according to claim 1. The image processing apparatus according to claim 1 or 2, further comprising a setting means for setting which of PQ (Perceptual Quantization) and HLG (Hybrid Log-Gamma) is used as the encoding method. The processing means
When the result of comparison of the comparison means indicates that the display dynamic range is narrower than the input dynamic range, and the PQ is set as the encoding method, the range indicated by the display dynamic range is set. The image processing apparatus according to claim 3, wherein the exposure is determined as an adjustable range. The processing means
When the result of comparison of the comparison means indicates that the display dynamic range is narrower than the input dynamic range and the HLG is set as the encoding method, the brightness detected by the detection means is used. The third or fourth aspect of claim 3 or 4, wherein the representative luminance values of the portion and the dark portion are corrected, and the adjustable range of the exposure is determined from the corrected representative luminance value and the range indicated by the display dynamic range. Image processing equipment. The image processing apparatus according to any one of claims 1 to 5, further comprising a means for developing and recording an image captured based on the adjusted exposure in the adjustable range of the exposure. .. The method according to any one of claims 1 to 6, wherein the detection means detects a representative luminance value of the bright portion and the dark portion from an image in a region set by the user in the image obtained by the imaging means. The image processing apparatus according to. It is a control method of an image processing device that presents information for adjusting the exposure of an image pickup means to a user.
A detection step of detecting representative brightness values of bright and dark areas based on the brightness distribution of image data obtained by imaging with the imaging means based on the initial exposure setting.
The setting process for setting the display dynamic range that represents the brightness range of the target display device, and
A comparison step of comparing an input dynamic range representing a luminance range imaged by the imaging means with the display dynamic range.
Based on the comparison result of the comparison step, the adjustable range of the exposure is determined using the representative luminance values of the bright and dark areas detected in the detection step, and the user interface for adjusting the exposure in the determined range. A control method for an image processing apparatus, which comprises a processing step for presenting. A program for causing the computer to execute each step of the method according to claim 8, which is read and executed by the computer.

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