JP5936358B2 - Image display device, image display method, imaging device and control method thereof, program, and storage medium storing the same - Google Patents

Description

  The present invention relates to image display in an imaging apparatus such as a digital camera, and more particularly to display of distance information between a subject and the imaging apparatus.

  When shooting with a digital camera, during manual focus, the user moves the focusing lens, zoom lens, aperture, etc., and adjusts the focus position.

  In manual focus, a distance gauge between the subject and the camera is displayed on the liquid crystal screen together with the image being shot, and the current focusing lens focus position is displayed on the gauge. The user can take a picture by adjusting the focus based on the displayed image and focusing position information of the focusing lens.

  On the other hand, regarding distance information between a camera and a subject, it is known that distance information can be obtained by using a phase difference of light incident on an external sensor or an image sensor and used for various processes. Pupil division phase difference detection is used for calculating distance information using the phase difference. In pupil division phase difference detection using an image sensor, each pixel of the image sensor has a microlens and a plurality of photoelectric conversion units. The pupil division is performed by a plurality of photoelectric conversion units, and the distance information in each pixel can be calculated from the correlation position relationship between the subject images.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique for separating the shielding object from the original image by using the distance information between the camera and the object to select the object and the shielding object based on the set threshold information. In Patent Document 1, distance information is displayed as a histogram when setting a threshold, and the threshold information is set by setting the range of the shielding object based on the histogram.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique for selecting distance information between a camera and a subject in each pixel as a histogram and selecting a subject to be photographed from a plurality of objects based on the histogram.

JP 2008-117305 A Patent No. 3949830

  In the conventional manual focus, when the subject is blurred due to the front pin and the rear pin, it may be difficult for the user to know which side of the focusing lens should be moved to focus. Further, there is no means for effectively knowing to what extent the subject has a depth of field adjusted by the lens zoom amount or the aperture.

  Further, in the method disclosed in Patent Document 1, since the current focus position information is not displayed even when the histogram of the distance between the camera and the subject is displayed, where the focus position is on the histogram. It was sometimes difficult to understand. In addition, the method disclosed in Patent Document 2 is inconvenient for the user to focus because it is not displayed even if a histogram of the distance between the camera and the subject is created.

  Accordingly, one of the objects of the present invention is to provide an image display apparatus that is advantageous for the user to perform focusing.

An image display device according to one aspect of the present invention calculates a calculation unit that calculates information corresponding to a distance to a subject in each pixel of an image sensor, and calculates a histogram of information corresponding to the distance calculated by the calculation unit. possess a histogram calculating means, and display means for displaying the current focal position of the focusing lens with the histogram, the display means, a distance display of the histogram, and be displayed in absolute distance, from the focal position It is possible to display at a relative distance of .

  According to the present invention, it is possible to provide an image display device that is advantageous for a user to perform focusing.

It is a figure which shows the image display method of the image at the time of manual imaging | photography mode, and imaging assistance information. It is a block diagram which shows the structure of the imaging device which has an image display apparatus. It is a block diagram which shows the structure of an image pick-up element. It is a top view which shows arrangement | positioning of the pixel of an image pick-up element, a photoelectric conversion part, and a color filter. It is a figure showing the image formation relationship formed in an image sensor and a lens. It is a figure showing the distance measurement method by a contrast detection system. It is a figure showing the imaging system which uses a relay lens.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a diagram showing an image display method of images and shooting assistance information in the manual shooting mode according to the embodiment of the present invention.

  Hereinafter, an image pickup apparatus having an image display device (hereinafter also referred to as a camera) according to a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 2 is a block diagram illustrating a configuration of an imaging apparatus having the image display apparatus according to the first embodiment of the present invention. In the figure, reference numeral 200 denotes a focusing lens, and 201 denotes a zoom lens. Reference numeral 202 denotes lens control means for driving the positions of the focusing lens 200 and the zoom lens 201, 203 denotes an aperture for adjusting the amount of light, and 204 denotes an aperture control means. In this embodiment, the focusing lens 200, the zoom lens 201, and the diaphragm 203 constitute a photographing optical system. Reference numeral 205 denotes an image sensor that photoelectrically converts incident light, which includes a plurality of pixels, and each pixel has a plurality of photoelectric conversion regions. Reference numeral 206 denotes an image sensor driving means for controlling the image sensor 205 and reading out a photoelectrically converted signal and controlling an electronic shutter function for controlling a signal accumulation time.

  An A / D converter 208 converts an analog signal that is an output of the image sensor 205 into a digital signal. Reference numeral 209 denotes signal processing means, which performs gamma correction on the input digital signal and then performs processing such as color separation and color difference matrix to create a photographed image. The distance calculation unit 210 calculates the distance between the camera and the subject from the input digital signal. The signal processing unit 209 generates a moving image by adding a synchronization signal to the captured image, and further has a file conversion control function such as JPEG compression / decompression. A memory 211 stores an image processed by the signal processing unit 209 or various settings.

  A recording medium 212 can record a photographed image and a distance image between the subject and the camera. A CPU 213 controls the operation of the entire camera, issues processing instructions to the signal processing unit 209, the distance calculation unit 210, and the like to exchange data. Reference numeral 215 denotes a display means (image display device) composed of a liquid crystal panel or the like, which displays an image output from the signal processing means 209. The display unit 215 can perform a touch panel operation, and touch position information on the display unit 215 is sent to the CPU 213. A release switch 216 serves as a shooting operation trigger when shooting an image.

  An example of the operation until the subject is recorded on the recording medium 212 will be described with reference to FIG. Shooting is performed when the photographer sets a mode switch (not shown) to the shooting mode. The lens control unit 202 drives the focusing lens 200 and the zoom lens 201, and the diaphragm control unit 204 drives the diaphragm 203.

  The light incident from the lens is photoelectrically converted by the image sensor 205, and the signal is converted into a digital signal by the A / D converter 208, and then signal processed by the signal processing unit 209.

  The CPU 213 calculates the distance to the subject in each pixel in the distance calculation unit 210. The measurement method is a phase difference detection method using an image sensor having a plurality of photoelectric conversion regions. That is, the distance is calculated by the phase difference method based on the shift amount of the image formed by the light flux that has passed through different pupil regions of the photographing optical system.

  A method for calculating the structure of the image sensor and the distance to the subject in each pixel will be described below with reference to FIGS. First, the image sensor 205 has a pixel structure shown in FIG. 3A is a front view, FIG. 3B is a cross-sectional view of a pixel, 301 is a microlens, and 302 and 303 are photoelectric conversion units. As shown in FIG. 3, pupil division is performed by arranging two photoelectric conversion units 302 and 303 for one microlens. The left and right pixels are referred to as A pixel and B pixel, and the images formed by collecting the left and right pixels are referred to as A image and B image, respectively.

  FIG. 4 is a plan view showing the arrangement of pixels, photoelectric conversion units, and color filters of the image sensor according to this embodiment. A circle in each pixel represents a microlens. Here, only 4 columns × 4 columns are extracted and shown. This image pickup element forms a general Bayer array by regularly arranging color filters of R (red), G (green), and B (blue) on each pixel. Each pixel has two photoelectric conversion units for A and B images. For example, in FIG. 4, the upper left G pixel has G1 which is the left photoelectric conversion unit 400 and G2 which is the right photoelectric conversion unit 401. Therefore, the two photoelectric conversion units in each pixel in FIG. 4 are photoelectrically converted through different exit pupils by pupil division.

  Next, a method for calculating the subject and distance using the image sensor will be described. FIG. 5 shows an imaging relationship formed on the imaging device and the lens shown in FIG. Reference numeral 500 denotes a lens, and reference numeral 501 denotes a cross section of the image sensor. In the optical system using the imaging device as shown in FIG. 4, for example, when an object image is formed in front of the imaging device as shown in FIG. 5, the upper side of the exit pupil shown by A in FIG. The passing half-beam is shifted downward on the image sensor as indicated by A ′. Further, the half light beam passing through the lower side of the exit pupil indicated by B is shifted upward as shown by B '. That is, a pair of image signals formed by a light beam that passes through half of the pupil of the imaging optical system in each pixel has a phase shifted in the vertical direction in FIG. 5 in accordance with the imaging state of the object image. Accordingly, the defocus amount is calculated by obtaining the shift amount, which is the relative positional relationship between the two subject images, from the correlation. Thereafter, the distance calculation unit 210 calculates the distance to the subject using the defocus amount and each information of the lens and the aperture. The calculated distance information is temporarily stored in the memory 211.

  The signal processing means 209 performs signal processing such as color separation and color difference matrix after the gamma correction on the input digital signal. After the signal processing, the display means 215 displays an image and photographing auxiliary information. When the release switch 216 is pressed, the image is recorded on the recording medium 212.

  In the case of the manual photographing mode, the photographer operates the focusing lens 200, the zoom lens 201, and the aperture 203 with the operation members (not shown) while viewing the image displayed on the display unit 215 and the photographing auxiliary information, thereby focusing. Set zoom, aperture, etc. Alternatively, the photographer may focus by moving the photographer himself / herself closer to the subject without operating the operation member. On the other hand, in the auto shooting mode, the CPU 213 controls the lens control unit 202 and the aperture control unit 204 according to the zoom set by the photographer and the input image, and automatically sets the focus, the aperture, and the like.

  With reference to FIG. 1, a method for displaying an image and photographing auxiliary information in the manual photographing mode will be described. The display area 100 is an area displayed by the display means 215 in FIG. 2, and displays an image and photographing auxiliary information. The image displayed on the display unit 215 is an image taken by live view. When the photographing mode is set to the manual photographing mode, the display unit 215 displays an enlarged image area 101 in which a part of the subject portion is enlarged near the center of the screen. In the present embodiment, for example, when a person is selected as the subject portion, the area of (in the vicinity of) the face area obtained by detecting the face of the person is enlarged and displayed as an enlarged image area 101. . Here, the signal processing unit 209 has a face detection function for detecting the face of a person as a subject portion using an image processing method such as pattern matching from the image signal. By displaying the enlarged image 101 on the display unit 215, the photographer can know the focus state of the subject in more detail.

  The CPU 213 acquires information on the current focusing lens 200 from the lens control unit 202 and causes the display unit 215 to display the distance gauge 102. The distance information (distance display) displayed on the distance gauge 102 calculates a representative focal position 103 before and after the current focal position of the focusing lens 200. For example, in FIG. 1, the logarithmic position is calculated as 10 cm, 50 cm, 1 m, 5 m, and ∞. The display unit 215 displays the current focal position 104 of the focusing lens 200 calculated by the CPU 213 on the distance gauge 102.

  The signal processing unit 209 (histogram calculation unit) calculates a distance histogram indicating the frequency of frequency appearance and displays the distance histogram on the display unit 215. That is, the signal processing unit 209 first acquires distance data temporarily stored in the memory 211, accumulates distance information of each pixel for each distance, and calculates a frequency distribution. A distance histogram 105 is created from the frequency distribution and sent to the display means 215. A distance gauge 102 is used for the axis in the distance direction of the histogram. The vertical axis orthogonal to the histogram distance axis is the number of pixels.

  The display means 215 displays the focus corresponding position 106 of the focusing lens 200 on the distance histogram 105. A point that moves in the direction perpendicular to the gauge from the focus position 104 in the distance gauge 102 and intersects the distance histogram 105 is displayed on the display means 215 as the focus corresponding position 106.

  Next, the display unit 215 displays a focused range on the distance histogram 105. The signal processing unit 209 calculates the depth of field based on the aperture information controlled by the aperture control unit 204 and the focusing lens position information controlled by the lens control unit 202. The display unit 215 displays the in-focus range 107 based on the depth of field calculated by the signal processing unit 209.

  In addition, the signal processing unit 209 calculates a histogram from a part of all the pixels of the image sensor 205 and causes the display unit 215 to display the histogram. Specifically, among the distance data stored in the memory 211, the distance in the enlarged image area 101 is acquired, and the frequency distribution of the subject distance in the enlarged image area 101 is calculated. A distance histogram 108 in the enlarged image area 101 is created from the frequency distribution and displayed on the display means 215. The display means 215 displays the focusing lens 109 and the in-focus range 110 on the distance histogram 108 of the enlarged image area 101 in the same manner as when displaying the distance histogram 105 of the entire image. Further, a point that moves in the direction perpendicular to the gauge from the focus position 109 in the distance gauge 111 and intersects the distance histogram is displayed on the display means 215 as the focus corresponding position 113.

  The signal processing means 209 calculates a representative focal position 112 before and after the focal position of the current focusing lens on the distance gauge 111 in the enlarged image region 101. Unlike the calculation of the representative focus position in the entire image, the representative focus position 112 in the enlarged image region 101 calculates the relative distance with the focus position 109 of the current focusing lens as the origin.

  A description will be given of how to set a representative focal position interval in the enlarged image region 101. Although the representative focus position in the distance histogram of the entire image is displayed in logarithmic display, the enlarged image region 101 is displayed at equal intervals. For example, in FIG. 1, -10 cm, -5 cm, +5 cm, and +10 cm are calculated. The display unit 215 simultaneously displays the representative focal position 112 calculated by the signal processing unit 209 on the distance gauge 111.

  In the display of the distance in the enlarged image area 101, the display is performed at finer intervals than in the case of the entire image. In that case, it is easier for the user to grasp the distance in the front and back if the display is performed at equal intervals than the display in logarithm, and it is often intuitive and easy for the user to understand.

  The display range of the distance histogram in the enlarged image area 101 can also be specified by the user. For example, the user sets the display range of the distance histogram from −5 cm to +5 cm by a touch panel operation on the display unit 215. In that case, the signal processing unit 209 causes the display unit 215 to display a display range designated from the created frequency distribution.

  The focusing lens 200 and the diaphragm 203 can also be controlled by a touch panel operation (adjusting means) in the display means 215. That is, when the display unit 215 moves the focus position 104 or the focus corresponding position 106 of the current focusing lens and the in-focus range 107 by a touch panel operation, the display unit 215 sends each position information to the CPU 213. The CPU 213 controls the lens control unit 202 and the diaphragm control unit 204 to drive the focusing lens 200 and the diaphragm 203.

  Further, the display unit 215 can control the focusing lens 200 and the aperture 203 by the CPU 213 in the same manner even when the focus position 109 of the current focusing lens in the enlarged image area 101 and the in-focus range 110 are moved.

  Hereinafter, an image pickup apparatus having an image display apparatus according to a second embodiment of the present invention will be described with reference to FIG. Since the basic configuration of the camera is the same as that of the first embodiment, the description thereof is omitted.

  The second embodiment differs from the first embodiment in the method of calculating the distance histogram of the in-focus range 110 in the enlarged image area 101 of FIG. In the phase difference detection method, it is known that the accuracy of the calculated distance between the subject and the camera depends on the depth of field. In the first embodiment, the distance between the subject and the camera is calculated by the phase difference detection method. However, particularly when the depth of field is deep, it is difficult to calculate the exact subject position within the depth of field. There is.

  The second embodiment is a method for solving the above problem, and calculates the distance between the subject and the camera within the depth of field by a hybrid method of a phase difference detection method and a contrast detection method.

  The contrast detection method will be briefly described. In this method, high-frequency components are extracted by applying a high-pass filter or a band-pass filter to all or a part of an image to be photographed. The extracted high-frequency component is included in proportion to the sharpness of the image. Therefore, by integrating this high frequency component for a predetermined image range, the level of sharpness (contrast) in the image range can be quantified.

  In this method, the sharpness is set as an evaluation value as a contrast value. When the subject is in focus, the contrast value is high. Conversely, when the subject is not in focus, the contrast value is low. Since there are variations due to the characteristics of the subject itself, whether or not the subject is in focus is determined by relatively comparing evaluation values.

  The focus adjustment operation in the contrast detection method will be described. This method is also called a mountain climbing method. That is, by moving the focusing lens position for each minute section and performing approximation processing such as linear approximation, a point having a relatively maximum evaluation value is calculated, and that point is set as a focused position.

  A method for more accurately measuring a distance histogram within the depth of field by a hybrid method of a phase difference detection method and a contrast detection method will be described. FIG. 6 is a diagram illustrating a distance measurement method using a contrast detection method.

  Similar to the first embodiment, the distance calculation unit 210 calculates the distance from the subject in each pixel by the phase difference detection method. The signal processing unit 209 calculates the depth of field 600 based on the aperture information controlled by the aperture control unit 204 and the focusing lens position information controlled by the lens control unit 202.

  In FIG. 6, the horizontal axis represents the focusing lens position, and the vertical axis represents the contrast detection evaluation value at each focal position. First, the lens control means 202 moves the focusing lens position to b1 near the depth of field. The distance calculation unit 210 calculates the contrast value of the enlarged image area 101. Similarly, the lens control unit 202 moves the focusing lens position to points b2 to b4 in the vicinity of the depth of field, and the distance calculation unit 210 calculates the contrast value of the enlarged image region 101. A straight line L1 is drawn from points b1 and b2 on the left side of the depth of field, and a straight line L2 is drawn from points b3 and b4, and an intersection point X of the straight lines L1 and L2 is set as a focal position of the subject.

  If the point curve in FIG. 6 is an actual contrast value, the point X obtained by linear approximation from the points b1 to b4 is almost the vertex of the point curve, and the focus position of the subject within the depth of field can be calculated correctly. You can see that The distance calculation means 210 calculates the distance from the subject at a certain pixel from the intersection point X.

  Similarly, the distance calculation unit 210 calculates distance information for each pixel in the enlarged image region 101 and stores it in the memory 211. The display method of the distance histogram in the enlarged image area is the same as in the first embodiment.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

  For example, in the first and second embodiments, the example in which the pupil is divided by a plurality of photoelectric conversion units with respect to one microlens is shown. However, if the signal is a pupil-divided signal, the microlens and the photoelectric conversion unit The same effect can be obtained with a signal that is light-shielded between and divided into pupils.

  Further, in the first and second embodiments, an image by a single-plate image pickup device is assumed. However, the effect of the present invention is also effective in a two-plate and three-plate image pickup device. The pupil division may not be between the microlens and the photoelectric conversion unit.

  FIG. 7 shows a parallel light region in the relay lens (a region where light spreading from the point light source at the object-side focal position becomes parallel), and simultaneously separates incident light into left and right images, and uses A and B images for different image sensors. The optical structure of the exposure system is shown. 701 is a mirror, 702 is a stop, and 703 is a relay lens. The light made into a parallel region by the relay lens 703 is divided into left and right by the mirror 701. The divided lights are reflected by mirrors 705 and 704, guided to the imaging lenses 706 and 707, and imaged on the image sensors 708 and 709. With such a configuration, it is possible to obtain an A image and a B image simultaneously with two image sensors, and by implementing the present invention, there are the same effects as in the other embodiments.

  Further, the A image and the B image may be exposed in a time division manner.

  Note that the processing of the above-described embodiment may provide a system or apparatus with a storage medium that records software program codes that embody each function. The functions of the above-described embodiments can be realized by the computer (or CPU or MPU) of the system or apparatus reading out and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention. As a storage medium for supplying such a program code, for example, a floppy (registered trademark) disk, a hard disk, an optical disk, a magneto-optical disk, or the like can be used. Alternatively, a CD-ROM, CD-R, magnetic tape, nonvolatile memory card, ROM, or the like can be used.

  The functions of the above-described embodiments are not only realized by executing the program code read by the computer. Including the case where the OS (operating system) running on the computer performs part or all of the actual processing based on the instruction of the program code, and the functions of the above-described embodiments are realized by the processing. It is.

  Further, the program code read from the storage medium may be written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. After that, the CPU of the function expansion board or function expansion unit performs part or all of the actual processing based on the instruction of the program code, and the functions of the above-described embodiments are realized by the processing. Is also included.

  The present invention can be suitably used for an imaging device having an image display device such as a video camera, a compact camera, or a single-lens reflex camera.

102 Distance gauge 104 Current focus lens focus position 105 Distance histogram 106 Focus position 107 Focus range

Claims (24)

Computing means for calculating information corresponding to the distance to the subject in each pixel of the image sensor;
Histogram calculating means for calculating a histogram of information corresponding to the distance calculated by the calculating means;
Have a display means for displaying the current focal position of the focusing lens with said histogram,
The display means is capable of displaying an absolute distance as a distance display of the histogram and displaying a relative distance from the focal position .   The image display apparatus according to claim 1, wherein the display unit displays a focused range on the histogram.   The image display device according to claim 1, further comprising operation means for operating the focusing lens. The display means displays an enlarged image area in which a part of the subject is enlarged,
The image display device according to claim 1, wherein the histogram calculation unit calculates the histogram in the enlarged image region.   The image display apparatus according to claim 1, wherein the display unit displays a distance display as a relative distance from the focal position.   The image display apparatus according to claim 1, wherein the display unit displays a distance display by a relative distance from the focal position and numerical values at equal intervals.   The image display apparatus according to claim 1, further comprising an adjusting unit that adjusts a position of the focusing lens by moving the focal position displayed together with the histogram.   8. The information processing apparatus according to claim 1, wherein the calculation unit calculates information corresponding to the distance by a phase difference detection method based on a shift amount of an image formed by a light beam that has passed through different pupil regions of the photographing optical system. The image display device according to any one of the above.   The image display apparatus according to claim 8, wherein the calculation unit calculates information corresponding to a distance by a combination of the phase difference detection method and a contrast detection method. The image display apparatus according to claim 1, wherein the display unit is capable of changing a range of distances displayed as the histogram. An image display device according to any one of claims 1 to 10 ,
An imaging device comprising: an imaging device that photoelectrically converts light from a subject. A calculation step of calculating information corresponding to the distance to the subject in each pixel of the image sensor;
A histogram calculation step of calculating a histogram of information corresponding to the distance calculated by the calculation step;
Have a, and a display step of displaying the current focal position of the focusing lens with said histogram,
In the display step, the distance display of the histogram can be displayed as an absolute distance and can be displayed as a relative distance from the focal position . A calculation step of calculating information corresponding to the distance to the subject in each pixel of the image sensor;
A histogram calculation step of calculating a histogram of information corresponding to the distance calculated by the calculation step;
A display step for displaying a current focal position of the focusing lens together with the histogram;
To the computer ,
In the display step, as a distance display of the histogram, it is possible to display an absolute distance and display a relative distance from the focal position . A storage medium for storing the program according to claim 13 . An image sensor;
Focus adjusting means for adjusting the focus by driving a focusing lens;
Computing means for calculating information corresponding to the distance to the subject for a plurality of regions of the image obtained from the image sensor;
Display means for displaying a histogram of information corresponding to the distance to the subject and the focus position of the focusing lens on a display medium;
I have a,
The image pickup apparatus characterized in that the display means can display an absolute distance as a distance display of the histogram and a relative distance from the focal position . The image pickup apparatus according to claim 15 , wherein the display unit displays images sequentially acquired from the image pickup element together with the histogram on a display medium. The imaging apparatus according to claim 15 , wherein the calculation unit calculates information corresponding to the distance by a phase difference detection method. The imaging apparatus according to claim 15 , wherein the calculation unit calculates information corresponding to the distance by a contrast detection method. The imaging apparatus according to claim 15 , wherein the calculation unit calculates information corresponding to the distance by a combination of a phase difference detection method and a contrast detection method. Wherein by moving the focal position being displayed along with the histogram, the image pickup apparatus according to any one of claims 15 to 19, characterized in that it comprises adjustment means for adjusting the position of the focusing lens. A method for controlling an imaging apparatus, comprising: an imaging element; and a focus adjusting unit that adjusts a focus by driving a focusing lens,
A calculation step of calculating information corresponding to the distance to the subject for a plurality of regions of the image obtained from the image sensor;
A display step of displaying on a display medium both a histogram of information corresponding to the distance to the subject and the focal position of the focusing lens;
I have a,
In the display step, the distance display of the histogram can be displayed with an absolute distance and can be displayed with a relative distance from the focal position . A program that causes a computer to execute a control method of an imaging apparatus having an imaging element and a focus adjustment unit that performs focus adjustment by driving a focusing lens,
A calculation step of calculating information corresponding to the distance to the subject for a plurality of regions of the image obtained from the image sensor;
A display step of displaying on a display medium both a histogram of information corresponding to the distance to the subject and the focal position of the focusing lens;
To the computer ,
In the display step, as a distance display of the histogram, it is possible to display an absolute distance and display a relative distance from the focal position . A storage medium for storing the program according to claim 22 . An image sensor;
Focus adjusting means for adjusting the focus by driving a focusing lens;
Computing means for calculating information corresponding to the distance to the subject for a plurality of regions of the image obtained from the image sensor;
Display means for displaying a histogram of information corresponding to the distance to the subject and the focus position of the focusing lens on a display medium;
Have
The image display apparatus, wherein the display unit displays a distance display with a relative distance from the focal position and numerical values at equal intervals.