JP2004297614A - Imaging apparatus and display method in imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To excellently display histograms of pixels with different sensitivities and to perform photographing while surely referring to the histograms. <P>SOLUTION: The imaging apparatus is provided with an imaging part 12 including a light receiving element for receiving incident object light and converting the light into an image signal composed of an electric signal, a digital signal processing part 32 for applying various kinds of correction processings to the image signal from the imaging part 12, and a display part 35 for displaying an image that is imaged on the basis of the image signal to which correction processing is applied in the digital signal processing part 32. As the light receiving element of the imaging part 12, a light receiving element equipped with a plurality of pixels each including a main region and a sub region with different sensitivities, is used. A histogram calculation processing part 38 is provided for calculating the histograms of image signals from the main region and the sub region, and graphs of the histograms of the main region and the sub region calculated in the histogram calculation processing part 38 can be simultaneously displayed on the display part 35. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an imaging device that performs imaging by capturing an image signal obtained by imaging a subject and imaging the subject on an imaging device, and a display method in the imaging device.
[0002]
[Prior art]
2. Description of the Related Art In recent years, so-called digital cameras have become widespread, which perform photographing by forming an image of a subject on an image sensor and taking in an image signal representing the subject. As an image pickup device used in this image pickup apparatus, a CCD (Charge Coupled Device) image pickup device that is a charge imaging device, an inexpensive and low power consumption CMOS image pickup sensor, or the like is used.
[0003]
Such a digital camera is provided with a display unit that displays a captured image, and is configured to be able to display various information such as a captured image and a setting value of the digital camera. .
Also, in this type of digital camera, there is a display unit that calculates a histogram representing the luminance level of a pixel and displays a histogram of the image together with a photographed image. Can check the appropriateness of exposure and the like (see Patent Documents 1 and 2).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-118772
[Patent Document 2]
JP-A-7-38801 [0006]
[Problems to be solved by the invention]
By the way, recently, a high-sensitivity signal and a low-sensitivity signal that is less sensitive than the high-sensitivity signal are acquired with a single image capture, and the dynamic range is expanded to enrich the details of overexposed parts at high brightness. Therefore, an image sensor having a plurality of pixels having a main region and a sub region having different sensitivities has been developed.
However, in the case where one histogram as described above is displayed on the display unit, two histograms having different ranges are separately obtained even if an image pickup device having a plurality of pixels having main areas and sub areas having different sensitivities is mounted. Therefore, it is difficult to compare and refer to these two histograms.
[0007]
The present invention has been made in view of the above circumstances, and provides an imaging apparatus that can display a histogram of pixels with different sensitivities and that can reliably reference the histogram to perform imaging, and a display method in the imaging apparatus. The purpose is to do.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an imaging apparatus according to claim 1 includes an imaging unit having a light receiving element that receives incident subject light and converts it into an electrical signal, and performs various correction processes on the electrical signal from the imaging unit. In addition, the image pickup apparatus includes a signal processing unit configured as an image signal, and a display unit that displays an image captured based on the image signal corrected by the signal processing unit, and the light receiving element includes: Provided with a plurality of pixels having a main region and a sub region with different sensitivities, a frequency distribution calculation processing unit for calculating a frequency distribution based on image signals from the main region and the sub region is provided, the display unit, The frequency distribution of the main area and the sub area calculated by the frequency distribution calculation processing unit can be displayed simultaneously.
[0009]
According to the imaging apparatus of claim 1, since the respective frequency distributions based on the image signals of the main area and the sub area having different sensitivities are displayed at the same time, the operator can take an image by easily referring to these frequency distributions. The state of the image can be grasped. Then, the operator can correct the image satisfactorily by adjusting re-shooting and correction processing of the image signal from each displayed frequency distribution.
[0010]
The imaging apparatus according to claim 2 is characterized in that the frequency distribution is displayed in an overlapping manner on the display unit.
According to the image pickup apparatus of the second aspect, it is possible to easily perform re-shooting and adjustment of image signal correction processing with reference to the respective frequency distributions displayed in an overlapping manner.
[0011]
The image pickup apparatus according to a third aspect is characterized in that the frequency distribution is displayed on the display unit side by side vertically or horizontally.
According to the image pickup apparatus of the third aspect, it is possible to easily adjust the re-shooting and the correction processing of the image signal with reference to the frequency distributions displayed side by side vertically or horizontally.
[0012]
The imaging device according to claim 4 is characterized in that a frequency distribution obtained by combining the frequency distributions is displayed on the display unit.
According to the imaging device of the fourth aspect, it is possible to easily perform re-shooting and adjustment of image signal correction processing with reference to the frequency distribution that is synthesized and displayed.
[0013]
The imaging device according to claim 5 is characterized in that the frequency distribution is displayed on the display unit so as to overlap the captured image.
According to the imaging device of the fifth aspect, since the frequency distribution can be referred to together with the captured image, the state of the captured image can be grasped accurately, and re-shooting and adjustment of image signal correction processing can be performed. Can be easily performed.
[0014]
The display method in the image pickup apparatus according to claim 6 receives incident subject light, converts it into an electrical signal, applies various correction processes to an image signal, displays an image captured based on the image signal, and stores the image. A frequency distribution calculating step of calculating a frequency distribution of image signals of a plurality of pixels having a captured main area and sub-area for each of the main area and the sub-area according to an operator's selection; And a frequency distribution display step of simultaneously displaying the calculated frequency distributions on the display unit.
[0015]
According to the display method of the image pickup apparatus according to claim 6, the frequency distribution is calculated for each of the main region and the sub region of the image signal based on the captured image signal by the operator's selection, and the frequency distribution is Since the images are displayed simultaneously on the display unit, the operator can very easily refer to the frequency distribution of each of the main area and the sub area to grasp the state of the photographed image and adjust the re-shooting and image signal correction processing. It can be performed.
[0016]
According to a seventh aspect of the present invention, there is provided a display method for an image pickup apparatus that receives incident subject light, converts it into an electrical signal, applies various correction processes to an image signal, displays an image captured based on the image signal, and stores the image. A frequency distribution calculating step of extracting an image signal of a plurality of pixels having a stored main region and sub region according to selection by an operator and calculating each of the main region and sub region, And a frequency distribution display step of simultaneously displaying the calculated frequency distributions on the display unit.
[0017]
According to the display method of the image pickup apparatus according to claim 7, the frequency distribution is calculated for each of the main region and the sub region of the image signal based on the stored image signal by the operator's selection, and these frequency distributions are calculated. Are simultaneously displayed on the display unit, so that the operator can very easily refer to the frequency distribution of the main area and the sub area to grasp the state of the photographed image and adjust the correction processing of the image signal. be able to.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an imaging device and a display method in the imaging device according to an embodiment of the present invention will be described with reference to the drawings.
Here, a digital camera that captures a still image will be described as an example of the imaging device.
FIG. 1 is a diagram illustrating a configuration of a digital camera. The digital camera 10 condenses light from the subject via the lens 11, and the light is received by the imaging unit 12 whose condensing surface is disposed at the focal position of the lens 11. The imaging unit 12 is configured by a honeycomb CCD including a plurality of light receiving elements each having an octagonal shape. Each light receiving element converts the received light into an electric signal according to the amount of light received, and the obtained electric signal is output to the amplifier 13 via the vertical transfer path (VCCD) and the horizontal transfer path (HCCD) according to the transfer pulse. Is done.
[0019]
FIG. 2 is a partially enlarged plan view of an individual image pickup element that is an image pickup element of the image pickup unit 13. The solid-state imaging device is a so-called honeycomb-structured solid-state imaging device, and is arranged on a semiconductor substrate surface in a row direction (direction indicated by an arrow X) and a plurality of columns arranged in a column direction (direction indicated by an arrow Y) perpendicular thereto. It includes a light receiving element 22 (only a part is numbered in the figure), a vertical transfer unit 24, a horizontal transfer unit 26, and an output unit 28. Among the plurality of light receiving elements 22, the odd-numbered ones are shifted in the column direction by approximately ½ of the column direction pitch between the adjacent light-receiving elements 22 with respect to the even-numbered ones. 22 are arranged so as to be shifted in the row direction by approximately ½ of the row direction pitch between the light receiving elements 22 adjacent to the light receiving elements 22 in even rows. In FIG. 2, the light receiving elements 22 of 5 rows and 8 columns are shown, but actually, more light receiving elements 22 are provided.
[0020]
The light receiving element 22 generates and accumulates signal charges corresponding to the amount of incident light, and is, for example, a photodiode. Each of the light receiving elements 22 includes a main region m having a relatively large light receiving area and a sub region s having a relatively small light receiving area, and generates a signal charge corresponding to light having a predetermined spectral sensitivity, accumulate. The sub-region s has a light receiving sensitivity lower than that of the main region m, and the amount of accumulated signal charges is smaller than that of the main region m.
[0021]
In the solid-state image sensor, any one of red (indicated by R), green (indicated by G), or blue (indicated by B) color filter (not shown) is provided above each light receiving element 22. It has been. Here, the main region m and the sub region s in the same light receiving element 22 are provided with the same color filter. The light receiving regions m and s of each light receiving element 22 generate and accumulate signal charges corresponding to the light of each color.
[0022]
The vertical transfer unit 24 reads the signal charges from the light receiving elements 22 and transfers them in the column direction, and is provided on the side corresponding to each column of the light receiving elements 22. The vertical transfer unit 24 reads the signal charges in the main region m and the signal charges in the sub region s independently in the column direction and transfers them to the horizontal transfer unit 26. The horizontal transfer unit 26 transfers the signal charges from the plurality of vertical transfer units 24 and transfers the transferred signal charges in the row direction. The output unit 28 outputs a voltage signal corresponding to the signal charge amount transferred from the horizontal transfer unit 26. Hereinafter, a plurality of voltage signals generated based on a plurality of charge signals from a plurality of main regions m are collectively generated based on a high sensitivity signal H and a plurality of charge signals from a plurality of subregions s. The plurality of voltage signals are referred to as low sensitivity signals L.
[0023]
The amplifier 13 is an amplifier that amplifies the image signals of the high sensitivity signal H and the low sensitivity signal L sent from the imaging unit 12 at a predetermined amplification factor. Thereafter, the electric signal is converted into a digital signal of a high sensitivity digital signal Ha and a low sensitivity digital signal La by the A / D converter 14 and sent to the bus line 30. The bus line 30 includes a CPU 31, a digital signal processing unit 32, a compression processing unit 33, a recording medium controller 34, a display unit 35, a RAM 36, a mode setting unit 37, and a histogram that is a frequency distribution calculating unit. A calculation processing unit 38 is connected.
[0024]
The digital signal processing unit 32 is a signal processing unit that performs various correction processes on the digital signal sent from the A / D converter 14, and specifically, based on an integrated value for each color according to an instruction from the CPU 31. White balance adjustment that multiplies the digital value of each color signal by a predetermined adjustment value, gamma correction that converts the input / output characteristics so that the RGB signal that has undergone white balance adjustment has the desired gamma characteristics, luminance signal and chroma signal A YC process to be generated is performed to create a digital image signal.
[0025]
FIG. 3 is a block diagram showing details of processing in the digital signal processing unit 32. The digital signal processing unit 32 includes a gain adjustment unit 41, a gradation correction unit 42, a synthesis processing unit 43, and a YC processing unit 44.
[0026]
The gain adjustment unit 41 is a multiplication circuit that performs digital signal gain adjustment such as white balance adjustment. The white balance adjustment is a process of correcting the color balance according to the color (color temperature) of the light source so that a white subject is imaged as white.
[0027]
The gradation correction unit 42 performs gradation correction of the gradation of the high-sensitivity digital signal Ha and the low-sensitivity digital signal La after gain adjustment independently from 12 bits to 8 bits using a predetermined coefficient. This gradation correction uses a high-sensitivity digital signal gradation correction LUT and a low-sensitivity digital signal gradation correction LUT in which coefficients are arranged in a matrix shape, and each digital signal uses a corresponding gradation correction LUT. Arithmetic processing is performed. The high-sensitivity digital signal Hb and low-sensitivity digital signal Lb having 8-bit gradation after gradation correction are subjected to a combining process by the combining processing unit 55.
[0028]
The synthesis processing unit 43 synthesizes the high-sensitivity digital signal Hb and the low-sensitivity digital signal Lb after gradation correction for each R, G, and B, and generates a synthesized digital signal S composed of the R signal, the G signal, and the B signal. To do.
The YC processing unit 44 includes a circuit that creates a luminance signal Y and chroma signals Cr and Cb from the R signal, G signal, and B signal of the combined digital signal S. The YC processing unit 44 performs various processes such as noise reduction on the generated luminance signal Y and chroma signals Cr and Cb to generate an uncompressed image signal.
[0029]
The compression processing unit 33 compresses the image signal generated by the digital signal processing unit 32 based on a predetermined compression method such as the JPEG method, and generates compressed data of a predetermined format. Conversely, the compression processing unit 33 also performs an operation of decompressing data compressed into a predetermined format in accordance with an instruction from the CPU 31.
[0030]
The recording medium controller 34 is an interface that is connected to a removable recording medium 40 such as a smart medium and transmits signals to and from the recording medium 40. The recording medium controller 34 reads data from the recording medium 40 and writes or erases data on the recording medium 40 in accordance with instructions from the CPU 31.
The display unit 35 has a monitor that displays an image signal. For example, the display unit 35 is attached to the back surface of the housing of the digital camera 10, and data written in the recording medium 40 is read out to the RAM 36 and displayed on a monitor on the display unit 35 in accordance with an instruction from the CPU 31. Is done.
[0031]
The mode setting unit 37 includes an operation unit such as a button switch of the digital camera 10. The mode setting unit 37 switches display on the display unit 35. In other words, the mode setting unit 37 displays the captured image, the histogram of the captured image, or both on the display unit 35.
[0032]
The histogram calculation processing unit 38 converts the image signal processed by the digital signal processing unit 32 or the image signal that is data recorded on the recording medium 40 into a high-sensitivity digital signal and a low-sensitivity digital signal before synthesis of the image. Based on this, a histogram that is a frequency distribution indicating the signal intensity of each image signal for each luminance is calculated. Each calculated histogram is configured to be stored in the recording medium 40 together with the captured image data.
[0033]
Next, processing in each mode in the digital camera will be described.
[Shooting mode]
First, processing in the shooting mode, which is a mode for shooting an image with the digital camera 10, will be described with reference to the flowchart shown in FIG.
[0034]
First, the operator sets a display mode on the display unit 35 of the digital camera 10 by operating the mode setting unit 37 of the digital camera 10.
Specifically, whether the histogram mode for displaying the histogram of the photographed image on the display unit 35 after photographing (step S1), the image mode for displaying the photographed image (step S2), or nothing is displayed. Whether to set the display mode (step S2) is selected and set.
[0035]
(Histogram display mode)
In the histogram display mode, when the operator depresses a release button provided on the digital camera 10, light from the subject is condensed through the lens 11 and received by the imaging unit 12, and the main area m of the imaging unit 12. And sub-region s is converted into an electrical signal of high-sensitivity signal H and low-sensitivity signal L, amplified by amplifier 13, and then converted into high-sensitivity digital signal Ha and low-sensitivity digital signal La by A / D converter 14. And sent to the bus line 30 (step S3).
[0036]
The high-sensitivity digital signal Ha and the low-sensitivity digital signal La are gain-adjusted and tone-corrected by the gain adjusting unit 41 and the tone correcting unit 42 of the digital signal processing unit 32, and further, synthesized by the synthesis processing unit 43 and YC processing unit 44. A composite digital signal S is generated, and a composite value of the image signal is generated and recorded on the recording medium 40 by the recording medium controller 34.
First, the captured image is displayed on the display unit 35 based on the image signal (step S4).
[0037]
Further, a histogram calculation processing unit 38 generates an image histogram from the high sensitivity digital signal Hb and the low sensitivity digital signal Lb that have been gain-adjusted and gradation-corrected by the gain adjustment unit 41 and the gradation correction unit 42 of the digital signal processing unit 32. Calculated.
Based on the histogram calculation data calculated by the histogram calculation processing unit 38, the display unit 35 displays the histogram (1) of the main area m and the histogram (2) of the sub area s as shown in FIG. Are simultaneously displayed in different colors (steps S5 and S6).
[0038]
Here, on the display unit 35, the portion where the histograms {circle over (1)} and {circle over (2)} overlap is displayed as a semi-transparent layer. In addition, since the main area m and the sub area s have different ranges, when the histogram is displayed in accordance with one range, the other histogram is interrupted in the middle and is not displayed normally or is difficult to see. Therefore, here, the histograms {circle around (1)} and {circle around (2)} having different ranges are normalized and displayed on the same screen.
Note that the histograms (1) and (2) can be displayed in a manner that the histograms (1) and (2) can be displayed side by side in the vertical and horizontal directions in addition to the overlapping display as described above. good.
In addition, as shown in FIG. 6, the display unit 35 can display the histograms (1) and (2) as a combined histogram as shown in FIG.
[0039]
The operator refers to the respective histograms {circle around (1)} and {circle around (2)} of the main area m and the sub area s displayed on the display unit 35 to determine whether or not to adjust the composite value of the image signal (step S7) When it is determined that it is necessary to adjust the composite value, the composite value is adjusted by operating the operation unit of the digital camera 10 (step S8).
[0040]
In this way, the image after the adjustment of the composite value is displayed on the display unit 35 (step S9), and the histograms {circle around (1)} and {circle around (2)} of the main area m and the sub area s are displayed again. The operator can refer to these histograms (1) and (2) again (steps S5 and S6).
Then, when the operator determines that it is not necessary to adjust the composite value (step S7), and continuously shooting, the release button is pressed again to perform shooting, and when shooting is ended. Then, the power switch is turned off (step S10).
[0041]
(Image display mode)
When the image display mode is selected, when the operator presses a release button provided on the digital camera 10, light from the subject is condensed through the lens 11 and received by the imaging unit 12, and the imaging unit In the 12 main regions m and subregions s, the signals are converted into electrical signals of high sensitivity signal H and low sensitivity signal L. The high sensitivity signal H and the low sensitivity signal L are amplified by the amplifier 13, and then converted into the high sensitivity digital signal Ha and the low sensitivity digital signal La by the A / D converter 14, and sent to the bus line 30.
[0042]
The high-sensitivity digital signal Ha and the low-sensitivity digital signal La are subjected to gain adjustment and gradation correction by the gain adjustment unit 41 and the gradation correction unit 42 of the digital signal processing unit 32, and further, the synthesis processing unit 43 and the YC processing unit 44. The synthesis and YC processing are performed by the above.
The display unit 35 displays a captured image based on this image signal.
[0043]
When the operator refers to the image displayed on the display unit 35 to determine whether or not to adjust the composite value of the image signal (step S11), and determines that the composite value needs to be adjusted, The synthesized value is adjusted by operating the operation unit of the digital camera 10 (step S12).
If it does in this way, the image after a synthesized value adjustment will be displayed on the display part 35 (step S13), and the operator can refer to the displayed image.
Then, when the operator determines that there is no need to adjust the composite value (step S11), and continuously shooting, the release button is pressed again to perform shooting, and when shooting is ended. Then, the power switch is turned off (step S14).
[0044]
(Non-display mode)
When the operator presses a release button provided on the digital camera 10, light from the subject is collected through the lens 11 and received by the imaging unit 12, and is input to the main area m and the sub area s of the imaging unit 12. Are converted into electrical signals of a high sensitivity signal H and a low sensitivity signal L, amplified by an amplifier 13, and then converted into a high sensitivity digital signal Ha and a low sensitivity digital signal La by an A / D converter 14, and a bus line 30 (Step S3).
[0045]
The high-sensitivity digital signal Ha and the low-sensitivity digital signal La are gain-adjusted and tone-corrected by the gain adjusting unit 41 and the tone correcting unit 42 of the digital signal processing unit 32, and further, synthesized by the synthesis processing unit 43 and YC processing unit 44. A composite digital signal S is generated and a composite value of the image signal is generated.
In this mode, nothing is displayed on the display unit 35. Therefore, when the operator continues to shoot after that, the release button is pressed again to shoot, When the shooting is finished, the power switch is turned off (step S15).
[0046]
[Playback mode]
Next, processing in the playback mode, which is a mode for playing back images with the digital camera 10, will be described with reference to the flowchart shown in FIG.
[0047]
When the operator operates the operation unit of the digital camera 10 to set the playback mode, an image signal that is data that has already been shot and recorded by the recording medium controller 34 is extracted from the storage medium 40. Is displayed on the display unit 35 (step S16).
Here, the operator refers to the image displayed on the display unit 35 and determines whether or not to display the histograms (1) and (2) of this image (step S17).
When the operator operates the operation unit to display the histograms (1) and (2), the display unit 35 displays histograms (1) and (2) for the main area m and the sub area s of the extracted image signal. Are simultaneously displayed in different colors (steps S18 and S19).
[0048]
The operator refers to the respective histograms {circle around (1)} and {circle around (2)} of the main area m and the sub area s displayed on the display unit 35 to determine whether or not to adjust the composite value of the image signal (step S20) If it is determined that it is necessary to adjust the composite value, the composite value is adjusted by operating the operation unit of the digital camera 10 (step S21).
If it does in this way, the image after a synthesized value adjustment will be displayed on the display part 35 (step S22).
[0049]
Here, when the operator wants to display again the histograms {circle around (1)} and {circle around (2)} of the image displayed on the display unit 35, the operator operates the operation unit of the digital camera 10. In this way, the histograms {circle around (1)} and {circle around (2)} of the main area m and the sub area s of the image whose composite values have been adjusted are displayed again on the display unit 35 (steps S18 and S19). , (2), it is possible to determine again whether or not the composite value needs to be adjusted (step S20).
[0050]
If it is determined that the composite value is not adjusted (step S20) and other image signals are to be reproduced continuously, the operation unit is operated to extract other image signals, and the above operation is performed. In the case of ending, the reproduction mode is ended by operating the operation unit (step S23). Note that the image signal whose composite value has been adjusted is recorded on the recording medium 40 by the recording medium controller 34 when another image signal is reproduced or the reproduction mode ends.
[0051]
Further, in the playback mode, without referring to the histograms {circle around (1)} and {circle around (2)} (step S17), it is determined whether or not the composite value is adjusted by referring only to the image displayed on the display unit 35 (step S20). You can also
[0052]
As described above, according to the imaging device including the digital camera, the respective histograms based on the image signals of the main region m and the sub region s having different sensitivities are displayed at the same time, so the operator can easily refer to these histograms. It is possible to grasp the state of the image taken in this way. Then, the operator can correct the image satisfactorily by re-taking from each displayed histogram and adjusting the correction processing of the image signal.
Further, according to the display method in the image pickup apparatus, the histogram of each of the main region m and the sub region s of the image signal based on the image signal taken by the operator or the image signal stored in the storage unit 40 is selected. Since these histograms are simultaneously displayed on the display unit 40, the operator can very easily refer to the histograms of the main area m and the sub area s to grasp the state of the captured image and It is possible to perform correction and adjustment of image signal correction processing.
[0053]
In the above example, a so-called digital camera that captures a still image has been described as an example of the imaging device. However, the present invention can also be applied to an imaging device including a digital video camera.
[0054]
【The invention's effect】
According to the imaging device and the imaging device of the present invention, the respective histograms based on the image signals of the main region and the sub region having different sensitivities are displayed at the same time, so that the operator can easily refer to these histograms and take images. You can grasp the state of. Then, the operator can correct the image satisfactorily by re-taking from each displayed histogram and adjusting the correction processing of the image signal.
Further, according to the display method in the image pickup apparatus of the present invention, the histogram is calculated for each of the main region and the sub region of the image signal based on the captured image signal or the stored image signal according to the selection of the operator. Since these histograms are simultaneously displayed on the display unit, the operator can very easily refer to the histograms of the main region and the sub region to grasp the state of the photographed image, and perform re-shooting and image signal correction. Processing adjustments can be made.
[Brief description of the drawings]
FIG. 1 is a functional block diagram illustrating a configuration of an imaging apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view of the image sensor for explaining a schematic structure of the image sensor.
FIG. 3 is a functional block diagram illustrating a configuration of a digital signal processing unit included in the imaging apparatus.
FIG. 4 is a flowchart illustrating a display method in a shooting mode in the imaging apparatus.
FIG. 5 is a diagram illustrating a histogram displayed on a display unit of the imaging apparatus.
FIG. 6 is a diagram illustrating a histogram displayed on a display unit of the imaging apparatus.
FIG. 7 is a flowchart illustrating a display method in a reproduction mode in the imaging apparatus.
[Explanation of symbols]
10 Digital camera (imaging device)
12 Image pickup unit 22 Light receiving element 32 Digital signal processing unit (signal processing unit)
35 Display section 38 Histogram calculation processing section m Main area s Sub area

Claims (7)

An imaging unit having a light receiving element that receives incident subject light and converts it into an electrical signal, a signal processing unit that performs various correction processes on the electrical signal from the imaging unit to obtain an image signal, and the signal processing unit An image pickup apparatus having a display unit that displays an image picked up based on an image signal subjected to correction processing;
The light receiving element includes a plurality of pixels having a main region and a sub region having different sensitivities,
A frequency distribution calculation processing unit for calculating a frequency distribution based on image signals from the main region and the sub region is provided,
The imaging apparatus, wherein the display unit can simultaneously display the respective frequency distributions of the main region and the sub region calculated by the frequency distribution calculation processing unit. The imaging apparatus according to claim 1, wherein the frequency distribution is displayed on the display unit in an overlapping manner. The imaging apparatus according to claim 1, wherein the frequency distribution is displayed on the display unit so as to be arranged vertically or horizontally. The imaging apparatus according to claim 1, wherein a frequency distribution obtained by combining the frequency distributions is displayed on the display unit. The imaging apparatus according to claim 1, wherein the frequency distribution is displayed on the display unit so as to overlap the captured image. A display method in an imaging apparatus that receives incident subject light, converts it into an electrical signal, applies various correction processes to obtain an image signal, and displays and stores an image captured based on the image signal,
A frequency distribution calculating step for calculating the frequency distribution of the image signal of a plurality of pixels having the photographed main area and sub area for each of the main area and the sub area according to the operator's selection, and the calculated frequency distribution for each display unit A display method in an imaging apparatus, comprising: performing a frequency distribution display step of simultaneously displaying on the imaging device. A display method in an imaging apparatus that receives incident subject light, converts it into an electrical signal, applies various correction processes to obtain an image signal, and displays and stores an image captured based on the image signal,
A frequency distribution calculating step of extracting an image signal of a plurality of pixels having a stored main area and sub area by selection of an operator and calculating each of the main area and sub area, and the calculated frequency distribution to the display unit A display method in an imaging apparatus, comprising: performing a frequency distribution display step of displaying simultaneously.

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