JP2018180135A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a focus detector which has an object resolution increased by using a two-dimensional area sensor with a finer pitch than the pitch of an existing AF line sensor and can obtain an appropriate result of measuring a distance if the object is perspective-competing.SOLUTION: The imaging device includes: photoelectric conversion pixels in a focus detection optical system formed as a two-dimensional area sensor; defocus value detection means; distant-view object region extraction means for extracting a distant-view object region from the result of detecting the defocus value. On the basis of the result of extraction of the distant-view object region in one of two directions substantially perpendicular to each other, the imaging device re-detects a defocus value in the other direction with the number of photoelectric conversion pixels in the other direction being limited, and detects the defocus value of the imaging lens based on the obtained results of detecting the defocus values in the two directions.SELECTED DRAWING: Figure 9

Description

  The present invention relates to an imaging apparatus and its control method, and more particularly to an imaging apparatus capable of automatic focusing and its control method.

  A single-lens reflex camera is equipped with a focus detection system based on a phase difference detection method that detects the defocus value of the imaging optical system from the phase difference between a pair of image signals formed by light passing through the imaging optical system in the interchangeable lens. Often In such a phase difference detection method, there is a possibility that the in-focus position can not be accurately detected due to the influence of the environment at the time of shooting or the influence of the subject.

  In order to solve such a problem, Patent Document 1 discloses an imaging device that detects a subject of interest with an imaging device and sets a distance measurement point based on the position of the subject of interest.

JP 2014-137567 A

  However, Patent Document 1 only mentions the point that distance measurement is performed at a distance measurement point near the subject of interest, and does not propose a special solution for enhancing the reliability of the distance measurement result.

  Therefore, according to the present invention, by using a two-dimensional area sensor with a finer pitch than the conventional AF line sensor, the object resolution can be improved, and appropriate distance measurement results can be obtained even for objects that are in perspective competition. An object of the present invention is to provide a focus detection device.

In order to achieve the above object, the focus detection device according to the present invention is
A subject image within a predetermined range is divided into two regions, each forming a pair in a first direction and a second direction substantially orthogonal to the first direction, and a light beam passing through each region is photoelectrically converted A focus detection optical system for forming an image on the upper side,
The photoelectric conversion pixels are configured as a two-dimensional area sensor arranged in the pairing direction and a direction substantially orthogonal thereto.
For each of the first direction and the second direction, in the direction substantially orthogonal to the pair, from the positional relationship of the pairwise direction of the optical image on the photoelectric conversion pixel that has passed through the focus detection optical system Defocus value detection means for detecting defocus values within the predetermined range;
The distant view subject area extraction means for extracting a distant view subject area in a direction substantially orthogonal to the pair from the result of the subject distance detection;
The defocus value redetection in the second direction is performed after limiting the number of photoelectric conversion pixels in the second direction based on the distant-view object region extraction result in the first direction,
The defocus value redetection in the first direction is performed after limiting the number of photoelectric conversion pixels in the first direction based on the distant-view object region extraction result in the second direction,
The defocus value of the photographing lens is detected from the obtained defocus value re-detection results of the first direction and the second direction.

  According to the present invention, it is possible to provide a focus detection apparatus capable of reducing the possibility of focusing on the background by the contrast of the background and appropriately focusing on the main subject even in a scene in which there is a distant competition.

Explanatory drawing of the whole camera configuration Explanatory view of the main parts of the focus detection optical system Top view of the aperture Plan of the area sensor light receiving surface Explanation of shooting range and focusing range An illustration of the image of the field on the sensor Explanatory view of selected pixel line in vertical eye optical system Explanatory diagram to calculate correlation from sensor output value Flow chart for selecting defocus value from vertical eye optics and horizontal eye optics results

  Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. However, the dimensions and shapes of the components exemplified in the present embodiment, their relative positions, and the like should be appropriately changed according to the configuration of the apparatus to which the present invention is applied and various conditions, and the present invention is an example of them. It is not limited to

  Hereinafter, a focus detection apparatus according to a first embodiment of the present invention will be described with reference to FIGS.

  In Example 1 of the present invention, a camera system is configured by applying the above-described present invention. FIG. 1 shows the configuration of the entire camera in the camera system of this embodiment.

  In FIG. 1, reference numeral 1 denotes a lens barrel. An imaging optical system 2, a lens driving unit 3, a lens state detecting unit 4, a lens control unit 5 and a storage unit 6 are provided inside the lens barrel 1.

  The imaging optical system 2 is composed of one or more lens groups, and it is possible to change the focal length and the focus by moving all or part of the lens group. Further, the lens driving means 3 is configured to move all or part of the lens of the imaging optical system 2 to adjust the focus state.

  The lens state detection means 4 detects the focal length of the imaging optical system 2, that is, the zoom state and the focus state, and the storage means 6 comprises storage means such as a ROM, and these are controlled by the lens control means 5. It is configured.

  Here, the lens state detection means 4 is a known method, for example, an electrode for an encoder provided on a lens barrel that rotates or moves to change the focal length of the imaging optical system 2 and a detection electrode etc. By using the above, the focal length (zoom state) of the imaging optical system 2 and the movement state of the lens moving when changing the focus or the amount characterizing the movement state is detected.

  The lens control means 5 is a memory for storing performance information such as focal length and open aperture value of the imaging optical system 2 and lens ID (identification) information which is unique information for identifying the imaging lens of the imaging optical system 2 (Not shown) is provided. The memory also stores information received from the camera control unit 21 by communication. The performance information and the lens ID information are transmitted to the camera control unit 21 through initial communication when the taking lens is attached to the imaging device 8, and the camera control unit 21 stores these in the storage device 14.

  8 is a camera body. 9 is a main mirror, 16 is a focusing plate on which an object image is formed, 17 is a pentaprism for image inversion, and 18 is an eyepiece optical system, and a finder system composed of these is provided in the camera body 8 .

  The light quantity of the object image formed on the focusing screen 16 is detected above the exit surface of the pentaprism 17 on the eyepiece optical system 18 side, and the aperture value of the imaging optical system at the time of shooting and the shutter speed of the camera are calculated. A photometric lens 19 and a photometric sensor 20 are disposed as photometric means for determining.

  The photometric sensor 20 detects an object image diffused by the focusing screen 16 from an angle different from the angle observed by the user. The photometric sensor 20 is composed of pixels having color filters of RGB colors, and converts light detected by the pixels having filters of RGB into electric signals by photoelectric conversion. The camera control unit 21 determines the color and light source of the subject by calculating the color ratio in which the color of the subject is digitized based on the electric signal. When the color of the subject or the light source changes, the focus detection optical system 12 described later is detected as if the focus has changed due to the influence of the chromatic aberration of the imaging optical system 2, and thus a focus detection error occurs. Therefore, it is corrected by an equation that is proportional to the focus detection error of the focus detection optical system 12 by the parameter of the color ratio.

  10 is a sub mirror for guiding the light flux transmitted through the main mirror 9 to the focus detection optical system 12, 11 is an image pickup element for photographing an object image formed by the imaging optical system 2, 12 is a focus detection optical system, 21 is a camera control means, Reference numeral 13 denotes an operation detection unit, reference numeral 14 denotes a storage device, and reference numeral 15 denotes a display unit, which are similarly provided in the camera body 8. The main mirror 9 is disposed at an angle with respect to the optical axis in the imaging light path, and is a first position (the illustrated position) for guiding the light flux from the subject to the upper finder optical system and a second position for retracting outside the imaging light path. It is possible to move to the position of. The central portion of the main mirror 9 is a half mirror, and when the main mirror 9 is down to the first position, a part of the light flux from the subject passes through the half mirror portion. Then, the transmitted light flux is reflected by the sub mirror 10 provided on the back side of the main mirror 9 and is guided to the focus detection optical system 12.

  When the main mirror 9 mirrors up to the second position, the sub mirror 10 is also folded together with the main mirror 9 and retracted out of the photographing optical path. As a result, the light flux that has passed through the photographing lens optical system passes through the focal plane shutter 23 which is a mechanical shutter and reaches the image pickup device 11. The focal plane shutter 23 limits the amount of light incident on the imaging device 11. The imaging element 11 outputs an electrical signal for photoelectrically converting an object image formed by the imaging optical system 2 to generate a photographed image, and is configured using a photoelectric conversion element such as a CCD sensor or a CMOS sensor. .

  The camera control unit 21 is a controller that controls various calculations and various operations in the imaging device 8, and stores the distant view subject region in the storage device 14 based on the result of the distant view subject region extraction unit 22 described later. The camera control unit 21 communicates with the lens control unit 5 in the imaging optical system 2 via the electrical contact unit 7. The camera control unit 21 detects the defocus value based on the pair of image signals generated by the focus detection optical system 12. The lens control means 5 controls the lens drive means 3 for driving the focus lens in the imaging optical system 2 in the optical axis direction to perform focusing in accordance with the control signal from the camera control unit 21. The lens drive means 3 has a stepping motor as a drive source.

  Further, a storage device 14 is connected to the camera control unit 21. The camera control unit 21 has functions of a defocus value detection unit to be described later and a reliability determination unit that determines the reliability of the defocus value detection result.

  In the storage device 14, parameters required to be adjusted in controlling the imaging device 8, camera ID (identification) information for performing individual identification of the imaging device 8, and imaging previously adjusted using a reference lens The factory adjustment value etc. of the parameter regarding are stored.

  The distant view subject area extraction means 22 divides the distant view subject and the main subject in each pixel line with respect to the subject that the photographer intends to image. The result is stored in the storage unit 14.

  The operation detection unit 13 detects an operation such as a release button or a selection button (not shown).

  The display unit 15 is a device for displaying image data captured by the imaging device 11 and displaying items set by the user, and is generally configured by a color liquid crystal display device.

  The focus detection optical system 12 is a focus detection optical system that performs focus detection by a so-called phase difference detection method. The focus detection optical system 12 divides the pupil of the imaging optical system 2 into a plurality of areas, and forms light quantity distributions of a plurality of object images using light fluxes passing through the respective areas. The focus detection optical system 12 is a detection method for detecting the in-focus state of the imaging optical system 2 with respect to a plurality of areas in the imaging range by obtaining the relative positional relationship of the plurality of light quantity distributions. It is used as a means for detecting the distance of movement to the in-focus position of all or part of the lenses of the optical system 2.

  FIG. 2 is a view for explaining the configuration of the main part of the focus detection optical system 12 in the camera system of the present embodiment shown in FIG. In FIG. 2, reference numeral 30 denotes an optical axis of the imaging optical system. Reference numeral 300 denotes a paraxial imaging plane conjugate to the imaging element (imaging plane) 11 by the sub mirror 10, and 12 includes the following 31 to 36.

  31 is a field lens, 32 is a reflection mirror, and 33 is an infrared cut filter. Reference numeral 34 denotes a stop, which has four openings 34-1, 34-2, 34-3, 34-4 as shown in FIG. The openings 34-1 and 34-2 divide an object image within a predetermined range into a first direction to form a pair, while the openings 34-3 and 34-4 are substantially orthogonal to the first direction. It is divided in the second direction to form a pair.

  Reference numeral 35 denotes a secondary imaging lens, which includes four lenses 35-1, 35-2, 35 arranged corresponding to the four apertures 34-1, 34-2, 34-3, 34-4 of the diaphragm 34. -3 and 35-4. Reference numeral 36 denotes an area sensor composed of photoelectric conversion pixels, and includes four area sensors 36-1 arranged corresponding to the four openings 34-1, 34-2, 34-3, 34-4 of the diaphragm 34, 36-2, 36-3, 36-4, which have subject images within a predetermined range.

  The field lens 31 images the four apertures of the diaphragm 34 on an AF pupil plane disposed at a position 100 mm away from the paraxial imaging plane conjugate to the imaging device (imaging plane) 11. A metal film of aluminum, silver or the like is vapor-deposited on the reflection mirror 32, and only a minimal area is vapor-deposited in order to reduce stray light incident on the sensor 36.

  FIG. 3 is a plan view of the diaphragm 34 shown in FIG. The diaphragm 34 has a configuration in which two horizontally long openings 34-1 and 34-2 and two vertically long openings 34-3 and 34-4 are arranged in the narrow direction of the opening width. In the figure, dotted lines indicate each of the secondary imaging lenses 35 disposed behind the apertures 34-1, 34-2, 34-3, 34-4 of the diaphragm 34. Areas of optical systems 35-1, 35-2, 35-3, 35-4 are shown. Here, the optical system for forming an image on the sensor 36 through the respective optical systems 35-1 and 35-2 of the apertures 34-1 and 34-2 of the diaphragm 34 and the secondary imaging lens 35 is a longitudinal optical system It is called. Similarly, an optical system which forms an image on the sensor 36 through the openings 34-3 and 34-4 of the stop 34 and the optical systems 35-3 and 35-4 of the secondary imaging lens 35 is referred to as a transverse optical system. .

  FIG. 4 is a plan view of the sensor 36 shown in FIG. Four area sensors 36-1, 36-2, 36-3, 36-4 shown in FIG. 4 are four area sensors in which pixels are two-dimensionally arrayed as shown in this figure. . Here, the four area sensors 36 are disposed, but the entire area on the sensor surface may be the area sensor 36. The luminous fluxes passing through the openings 34-1 and 34-2 of the diaphragm 34 are imaged on the sensor at 36-1 and 36-2, respectively, and these are assumed to be longitudinal optical systems. In particular, an optical image forming an image 36-1 is referred to as an A image of the longitudinal optical system, and an optical image forming an image 36-2 as a B image of the longitudinal optical system. Similarly, since the light beams having passed through the apertures 34-3 and 34-4 of the diaphragm 34 are imaged on the 36-3 and 36-4, respectively, these are made to be a lateral optical system, and an optical for imaging the 36-3 An optical image for forming an image on an A image of the lateral eye optical system and an optical image forming an image 36-4 is referred to as a B image of the lateral eye optical system. Further, a direction in which the relative position of a pair of subject images changes is referred to as a correlation direction, and a direction orthogonal to the correlation direction is referred to as a correlation orthogonal direction. In the vertical-eye optical system, 36-1 and 36-2 are the correlation directions, and in the horizontal-eye optical system, 36-3 and 36-4 are the correlation directions. The area sensor is composed of photoelectric conversion pixels, and the pixels are arranged in the correlation direction and the correlation orthogonal direction.

  In the focus detection system having the above components, as shown in FIG. 2, light beams 37-1 and 37-2 from the imaging optical system 2 are reflected by the sub mirror 10 after being transmitted through the half mirror surface of the main mirror 9. After changing the direction again by the reflection mirror 32, through the infrared cut filter 33, through the four openings 34-1, 34-2, 34-3, 34-4 of the diaphragm 34, a secondary imaging lens The light is collected by each of the 35 optical systems 35-1, 35-2, 35-3, 35-4 and reaches the area sensors 36-1, 36-2, 36-3, 36-4 of the sensor 36, respectively. Do.

  The light beams 37-1 and 37-2 in FIG. 2 indicate the light beams forming an image on the longitudinal optical system on the light receiving surface of the sensor 36. The horizontal optical system also reaches the sensor 36 through the same path. As a whole, the distribution of four light quantities related to the subject image corresponding to a predetermined two-dimensional area is formed on each of the area sensors 36-1, 36-2, 36-3, 36-4 of the sensor 36.

  The focus detection optical system 12 in FIG. 1 detects defocus values based on the same detection principle as the known focus detection method for the light quantity distributions of the four object images obtained as described above, and the focus is shifted. The quantity D is calculated. That is, the relative positional relationship between the four object images 2203-a and 2203-b and 2303-a and 2303-b shown in FIG. 6 can be compared with each of the area sensors 36-1 and 36-2, 36-3 and 36-4. The defocus value is detected using the detection result of the pixel, and the result is calculated as the defocus amount D.

  36-1 has pixel lines corresponding to the number of arrangement like 36-1-1, 36-1-2, 36-1-3, and each pixel line has a defocus value, accordingly The out-of-focus amount D is calculated.

  Here, the number of photoelectric conversion pixels used to detect the defocus value will be described. An operation for detecting the defocus value from the positional deviation amount of the subject image in the correlation direction is called a correlation operation. The correlation operation detects the relative positional deviation amount of the subject image reaching each sensor based on the two pixel line outputs arranged in the correlation direction, but the number of pixels and pixels used for the correlation operation in the pixel line The range is freely selectable. As an example, in order to reduce the calculation load, when using a lens on the wide-angle side, it is assumed that the subject image is small with respect to the focus detection area, and the number of pixels is reduced. There is a possibility that the calculation pixel number is changed.

  The above is the description of the optical system in the focus detection optical system 12.

  FIG. 5 shows a photographing range and a focusing range. Here, reference numeral 2101 denotes a shooting range on the subject side, and reference numeral 2102 denotes a range in which the focus detection is possible within the shooting range 2101. Reference numeral 2103 denotes a main subject. When focus detection is to be performed using the focus detection optical system 12 in such a photographing scene, the sensors 36-1, 36-2, 36-3, 36, as shown in FIG. An image in the range of the above-mentioned 2102 is formed on the -4, and images 2203-a, 2203-b, 2303-a, and 2303-b of the subject 2103 for the main subject are formed, respectively.

  FIG. 7 shows a case where the correlation calculation of the vertical-eye optical system is performed to set the main subject 2103 as 2301-1 and 2301-2. Also, the outputs of the sensors from 2301-1 and 2301-2 are as shown in FIG. (A) represents the output of 2301-1 and (B) represents the output of 2301-2, and the correlation operation is performed using the respective outputs. For example, when the output reading start position on the sensor line is from above (Fig. 7), the sensor output becomes higher at the hair-forehead boundary, the forehead-eyebrow boundary, the eye-cheek boundary, the cheek-mouth boundary, etc. It is. As a feature in calculating the image interval, it is possible to detect the defocus value with high accuracy if the contrast is high, so the boundary between the hair and the forehead as indicated by the pixel line 2301-1 and 2301-2. A part or the like is suitable for detecting the defocus value.

  Next, a description will be made to distinguish between a distant subject and a main subject from a far-and-far conflicting object scene. The focus detection optical system 12 detects the defocus value in the correlation direction in each of the vertical eye optical system and the horizontal eye optical system. The distant view object area extraction unit, which is the distant view object area extraction unit 22, extracts a distant view object area in the direction in which the vertical-eye optical system and the horizontal-eye optical system are paired, from the defocus value detection result. For example, in the case of the vertical-eye optical system, the distant subject area is extracted by determining where the distant subject is in the horizontal direction from the result of each continuous pixel line. That is, when the difference between the defocus amount D between a pixel line A and a pixel line B located farther than that is greater than the perspective determination threshold X, the subject in the pixel line B region is determined to be a distant subject, and the pixel line A It is determined that the subject in the area is the main subject. Similarly, in the case of the horizontal-eye optical system, a distant subject area is extracted in the vertical direction.

  Here, the distance determination threshold X may be a fixed value stored in the storage device 14 at the time of shipment from the factory, or the user may uniquely set it by the operation detection unit 13.

  Here, an example is shown in which the distant subject region is detected from the defocus value of the vertical-eye optical system. The longitudinal optical system calculates the defocus amount D from the misregistration amounts of the two images aligned in the longitudinal direction as shown by 2203-a and 2203-b in FIG. The focus detection pixels of the vertical-eye optical system calculate the defocus amount D in each row arranged horizontally, so when the difference between the pixel lines of the defocus amount D exceeds the distance determination threshold X, the defocus amount D From the values, the near view area and the far view area can be extracted in the horizontal direction in which the rows are arranged. At this time, if defocus values are detected for similar subject areas by the horizontal eye optical systems shown in 2303-a and 2303-b in FIG. 6, the correlation calculation pixel line of the horizontal eye optical system detects both distant subjects and near subjects Detection of the defocus value and calculation of the defocus amount D will be performed while simultaneously looking at the image misalignment amount. On the other hand, in the present invention, the horizontal distant view area extracted by the vertical-eye optical system is excluded from the pixels used for the correlation operation in the horizontal-eye optical system, and the defocus value is detected and out of focus only with the main subject image. Calculate the quantity D. This makes it possible to reduce the influence of the distant subject which is the background in the correlation calculation, and it becomes possible to calculate the defocus amount D with higher accuracy.

  A flowchart up to selection of defocus values of the vertical eye optical system and the horizontal eye optical system will be described with reference to FIG.

  When the photographer performs focus detection (AF) on an image in which a distant subject and a main subject are mixed, first, in step 1, the defocus value is detected in each pixel line of the vertical-eye optical system, and the value is used as the defocus amount D As the storage unit 14 and the process proceeds to step 2.

  In step 2, as described above, the difference between the pixel lines of the defocus amount D is compared with the distance determination threshold X to determine whether a distant subject is included in the AF range. Furthermore, when the distant view subject is included, an area determined to be distant view is extracted in the horizontal direction, and stored in the storage device 14 as the range <a>, and the process shifts to step 3. At this time, if it is determined that the distant view subject is not included, the range <a> is stored in the storage device 14 as no area.

  In step 3, the defocus value is detected at each pixel line of the horizontal optical system. At this time, the number of correlation calculation pixels is limited based on the above-mentioned range <a>. This is because the defocus value is detected from the image shift amount of the area where the distant view area which is the background and the near view area which is the main subject are mixed, while the defocus amount is detected based on the image shift amount of the area limited to only the near view area. It is because the influence of the distant view area is small when the image shift is calculated when the value is detected, and the distance measurement with higher accuracy can be performed. After detecting the defocus value and storing the defocus amount D in each line in the storage device 14, the process proceeds to step 4.

  In step 4, as with step 2 in the vertical-eye optical system, the difference between the pixel lines of defocus amount D for the horizontal-eye optical system is compared with the distance determination threshold X, and the distant view object within the AF range It is determined whether it contains or not. Furthermore, when the distant view subject is included, an area determined to be distant view is extracted in the vertical direction, stored as the range <b> in the storage device 14, and the process proceeds to step 5. At this time, if it is determined that the distant view subject is not included, the range <b> is stored in the storage device 14 as no area.

  In step 5, for pixel lines in the near view area outside the above-described range <a> of the longitudinal optical system, as in the case of step 3 in the lateral-eye optical system, correlation operation pixels are calculated based on the above range <b> Limit the number and detect the defocus value. After the detection of the defocus value is completed and the defocus amount D in each line is stored in the storage device 14, the process proceeds to step 6. At this time, regarding the storage of the defocus amount D, the defocus amount D stored in step 1 may be updated and stored, or may be stored as another value.

  In step 6, the final focus deviation is based on the distance measurement results outside the range <a> of the vertical-eye optical system stored in step 5 and the distance measurement results outside the range <b> of the horizontal-eye optical system stored in step 3. Calculate an appropriate value as the amount D. Regarding this calculation method, the distance measurement result with the vertical eye optical system and the distance measurement result with the horizontal eye optical system are selected, in which the pixel line with the highest reliability is selected for each pixel line of the vertical eye optical system and horizontal eye optical system. Several methods, such as averaging, are conceivable and are not limited in the present embodiment.

  In this embodiment, an example is shown in which the defocus value detection in the longitudinal optical system not limited to pixels is preceded, but the defocus value detection in the horizontal optical system is preceded without pixel limitation, and the longitudinal optical is performed. The defocus value detection in the system may be performed with pixel limitation. If the correlation calculation is finally performed excluding the pixels in the distant view area, the calculation order of the vertical-eye optical system / horizontal-eye optical system is not limited.

  The above is the flow chart when selecting the defocus value of the vertical-eye optical system and the horizontal-vision optical system at the time of shooting.

  As mentioned above, although the 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.

12 focus detection optical system de, 21 focus value detection means,
22 distant subject area extraction means, 36 photoelectric conversion pixels

Claims (1)

A subject image within a predetermined range is divided into two regions, each forming a pair in a first direction and a second direction orthogonal to the first direction, and the light flux passing through each region is on a photoelectric conversion pixel A focus detection optical system for forming an image on the
The photoelectric conversion pixel is configured as a two-dimensional area sensor arranged in the pairing direction and a direction orthogonal thereto.
For each of the first direction and the second direction, based on the positional relationship of the pairwise direction of the optical image on the photoelectric conversion pixel that has passed through the focus detection optical system, each in the direction orthogonal to the pair Defocus value detection means for detecting the defocus value within the predetermined range;
A distant view object area extraction unit that extracts a distant view object area in the direction orthogonal to the pair from the result of the object distance detection;
Have
The defocus value redetection in the second direction is performed after limiting the number of photoelectric conversion pixels in the second direction based on the distant-view object region extraction result in the first direction,
The defocus value redetection in the first direction is performed after limiting the number of photoelectric conversion pixels in the first direction based on the distant-view object region extraction result in the second direction,
A focus detection device characterized by performing detection of a defocus value of the photographing lens from the obtained defocus value re-detection results of the first direction and the second direction.