JP6183482B2 - Focus detection apparatus and imaging apparatus - Google Patents

Description

  The present invention relates to a focus detection apparatus and an imaging apparatus.

  2. Description of the Related Art Conventionally, a technique for specifying a specific subject in a shooting screen and detecting a focus state of an optical system at a position corresponding to the specific subject is known (for example, Patent Document 1).

JP 2007-279601 A

  However, in the conventional technique, even when a specific subject is not specified, focus detection is performed by the contrast detection method, which requires a longer time for focus detection than the focus detection by the phase difference detection method using the phase difference. In some cases, the time required for focus detection becomes longer.

  The present invention solves the above problems by the following means. In the following description, reference numerals corresponding to the drawings showing the embodiment of the present invention are given and described. However, the reference numerals are only for facilitating the understanding of the invention and are not intended to limit the invention. .

[1] A focus detection apparatus according to the present invention captures an image by an optical system having a focus adjustment optical system and outputs a signal, and a specific subject from an image based on the signal output from the image sensor. A focus position of the focus adjustment optical system in which an image by the optical system in the first region of an image based on a signal output from the image sensor is focused on the image sensor and the focus adjustment optical system; A first detector that detects the amount of deviation from the position based on a signal output from the image sensor, a first area of an image based on the signal output from the image sensor, and a first area other than the first area A second detection unit that detects, based on a signal output from the image pickup device, a focus position of the focus adjustment optical system in which an image in two regions is focused on the image pickup device; Identified If the first detection region is a region for detecting the position of the focus adjustment optical system and the shift amount cannot be detected by the first detection unit, the first detection unit moves the focus adjustment optical system. When the shift amount is detected and the in-focus position is detected by the second detection unit, and the specific object is specified in the first region by the specifying unit, the shift amount is detected by the first detection unit. And a control unit that causes the second detection unit to detect the in-focus position when the specific subject is specified in the second region by the specifying unit .

[2] In the invention related to the focus detection device, the control unit detects the position of the focus adjustment optical system by the first detection unit and the second detection unit while moving the focus adjustment optical system, When the shift amount is detected by the first detection unit and the in-focus position is detected by the second detection unit, the focus adjustment optical system can be moved based on the shift amount. .

[3] In the invention related to the focus detection apparatus, when the shift amount is detected by the first detection unit, the control unit moves the focus adjustment optical system based on the shift amount, and the second control unit detects the shift amount. When the in-focus position can be detected by the detection unit, the focus adjustment optical system can be configured to move based on the detection result of the second detection unit .

[4] In the invention according to the focus detection device, the imaging element includes a focus detection pixel and an imaging pixel, and the first detection unit is configured to detect the shift amount based on a signal output from the focus detection pixel. The second detection unit can be configured to detect the in-focus position based on an image contrast based on a signal output from the imaging pixel .

[5] In the invention related to the focus detection apparatus, when the specific object is specified by the specifying unit, the control unit captures the specific object in the first detection unit or the second detection unit. The focusing position of the focusing optical system that focuses on the element can be detected .

[6] In the invention according to the focus detection apparatus, the focus detection device includes a selection unit that selects a subject from an image based on the signal output from the imaging element, and the specification unit selects the subject selected by the selection unit as a specific subject. It can be configured to be specified as

[7] In the invention related to the focus detection apparatus, the display unit includes a display unit, and the display unit is configured to display an image indicating the first region so as to be superimposed on an image obtained through the optical system. be able to.

  [8] An imaging device according to the present invention includes the focus detection device.

FIG. 1 is a block diagram showing a camera according to the first embodiment. FIG. 2 is a front view showing a focus detection position on the imaging surface of the imaging device shown in FIG. FIG. 3 is a front view schematically showing the arrangement of the focus detection pixels 222a and 222b by enlarging the III part of FIG. FIG. 4 is an enlarged front view showing one of the imaging pixels 221. FIG. 5A is an enlarged front view showing one of the focus detection pixels 222a, and FIG. 5B is an enlarged front view showing one of the focus detection pixels 222b. FIG. 6 is an enlarged cross-sectional view showing one of the imaging pixels 221. FIG. 7A is an enlarged cross-sectional view showing one of the focus detection pixels 222a, and FIG. 7B is an enlarged cross-sectional view showing one of the focus detection pixels 222b. 8 is a cross-sectional view taken along line VIII-VIII in FIG. FIG. 9 is a flowchart showing the operation of the camera according to the present embodiment. FIG. 10 is a diagram for explaining a focus detection method when a specific subject is not specified in the present embodiment. FIG. 11 is a diagram for explaining a focus detection method when a specific subject is specified in the present embodiment. FIG. 12 is a flowchart showing the scan operation execution process in steps S115 and S125.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a main part configuration diagram showing a digital camera 1 according to an embodiment of the present invention. A digital camera 1 according to the present embodiment (hereinafter simply referred to as a camera 1) includes a camera body 2 and a lens barrel 3, and the camera body 2 and the lens barrel 3 are detachably coupled by a mount unit 4. Yes.

  The lens barrel 3 is an interchangeable lens that can be attached to and detached from the camera body 2. As shown in FIG. 1, the lens barrel 3 includes a photographic optical system including lenses 31, 32, 33 and a diaphragm 34.

  The lens 32 is a focus lens, and can adjust the focal length of the photographing optical system by moving in the direction of the optical axis L1. The focus lens 32 is provided so as to be movable along the optical axis L1 of the lens barrel 3, and its position is adjusted by the focus lens drive motor 36 while its position is detected by the encoder 35.

  The specific configuration of the moving mechanism along the optical axis L1 of the focus lens 32 is not particularly limited. For example, a rotating cylinder is rotatably inserted into a fixed cylinder fixed to the lens barrel 3, a helicoid groove (spiral groove) is formed on the inner peripheral surface of the rotating cylinder, and the focus lens 32 is fixed. The end of the lens frame is fitted into the helicoid groove. Then, by rotating the rotating cylinder by the focus lens drive motor 36, the focus lens 32 fixed to the lens frame moves straight along the optical axis L1.

  As described above, the focus lens 32 fixed to the lens frame by rotating the rotary cylinder with respect to the lens barrel 3 moves straight in the direction of the optical axis L1, but the focus lens drive motor 36 as the drive source is the lens. The lens barrel 3 is provided. The focus lens drive motor 36 and the rotary cylinder are connected by a transmission composed of a plurality of gears, for example, and when the drive shaft of the focus lens drive motor 36 is driven to rotate in any one direction, it is transmitted to the rotary cylinder at a predetermined gear ratio. Then, when the rotating cylinder rotates in any one direction, the focus lens 32 fixed to the lens frame moves linearly in any direction of the optical axis L1. When the drive shaft of the focus lens drive motor 36 is rotated in the reverse direction, the plurality of gears constituting the transmission also rotate in the reverse direction, and the focus lens 32 moves straight in the reverse direction of the optical axis L1. .

  The position of the focus lens 32 is detected by the encoder 35. As described above, the position of the focus lens 32 in the optical axis L1 direction correlates with the rotation angle of the rotating cylinder, and can be obtained by detecting the relative rotation angle of the rotating cylinder with respect to the lens barrel 3, for example.

  As the encoder 35 of this embodiment, an encoder that detects the rotation of a rotating disk coupled to the rotational drive of the rotating cylinder with an optical sensor such as a photo interrupter and outputs a pulse signal corresponding to the number of rotations, or a fixed cylinder And the contact point of the brush on the surface of the flexible printed wiring board provided on either one of the rotating cylinders, and the brush contact provided on the other, the amount of movement of the rotating cylinder (in either the rotational direction or the optical axis direction) A device that detects a change in the contact position according to the detection circuit using a detection circuit can be used.

  The focus lens 32 can move in the direction of the optical axis L1 from the end on the camera body side (also referred to as the closest end) to the end on the subject side (also referred to as the infinite end) by the rotation of the rotating cylinder described above. it can. Incidentally, the current position information of the focus lens 32 detected by the encoder 35 is sent to the camera control unit 21 to be described later via the lens control unit 37, and the focus lens drive motor 36 calculates the focus calculated based on this information. The driving position of the lens 32 is driven by being sent from the camera control unit 21 via the lens control unit 37.

  The diaphragm 34 is configured such that the aperture diameter around the optical axis L1 can be adjusted in order to limit the amount of light flux that passes through the photographing optical system and reaches the image sensor 22 and to adjust the blur amount. The adjustment of the aperture diameter by the diaphragm 34 is performed, for example, by sending an aperture diameter corresponding to the aperture value calculated in the automatic exposure mode from the camera control unit 21 via the lens control unit 37. Further, the aperture diameter corresponding to the set photographing aperture value is input from the camera control unit 21 to the lens control unit 37 by manual operation by the operation unit 28 provided in the camera body 2. The aperture diameter of the aperture 34 is detected by an aperture sensor (not shown), and the lens controller 37 recognizes the current aperture diameter.

  On the other hand, the camera body 2 is provided with an imaging element 22 that receives the light beam L1 from the photographing optical system on a planned focal plane of the photographing optical system, and a shutter 23 is provided on the front surface thereof. The image sensor 22 is composed of a device such as a CCD or CMOS, converts the received optical signal into an electrical signal, and sends it to the camera control unit 21. The captured image information sent to the camera control unit 21 is sequentially sent to the liquid crystal drive circuit 25 and displayed on the electronic viewfinder (EVF) 26 of the observation optical system, and a release button ( When (not shown) is fully pressed, the photographed image information is recorded in the memory 24 that is a recording medium. As such a memory, either a removable card type memory or a built-in type memory can be used. An infrared cut filter for cutting infrared light and an optical low-pass filter for preventing image aliasing noise are disposed in front of the imaging surface of the image sensor 22. Details of the structure of the image sensor 22 will be described later.

  The camera body 2 is provided with an observation optical system for observing an image picked up by the image pickup device 22. The observation optical system of the present embodiment includes an electronic viewfinder (EVF) 26 composed of a liquid crystal display element, a liquid crystal driving circuit 25 that drives the electronic viewfinder (EVF) 26, and an eyepiece lens 27. The liquid crystal drive circuit 25 reads the captured image information captured by the image sensor 22 and sent to the camera control unit 21, and drives the electronic viewfinder 26 based on the read image information. Thereby, the user can observe the current captured image through the eyepiece lens 27. Note that, instead of or in addition to the observation optical system using the optical axis L2, a liquid crystal display may be provided on the back surface of the camera body 2, and a photographed image may be displayed on the liquid crystal display.

  A camera control unit 21 is provided in the camera body 2. The camera control unit 21 is electrically connected to the lens control unit 37 through an electric signal contact unit 41 provided in the mount unit 4, receives lens information from the lens control unit 37, and defocuses to the lens control unit 37. Send information such as volume and aperture diameter. The camera control unit 21 reads out the pixel output from the image sensor 22 as described above, generates image information by performing predetermined information processing on the read out pixel output as necessary, and generates the generated image information. Are output to the liquid crystal driving circuit 25 of the electronic viewfinder 26 and the memory 24 which is a recording medium. The camera control unit 21 controls the entire camera 1 such as correction of image information from the image sensor 22 and detection of a focus adjustment state and an aperture adjustment state of the lens barrel 3.

  In addition to the above, the camera control unit 21 detects the focus state of the photographing optical system by the phase detection method and the focus state of the optical system by the contrast detection method based on the pixel data read from the image sensor 22. Do. A method for detecting the focus state will be described later.

  The operation unit 28 is a shutter release button or an input switch for the photographer to set various operation modes of the camera 1, and switches between the auto focus mode / manual focus mode and the one shot mode / continuity even in the auto focus mode. It is possible to switch between the numeric modes. Here, the one-shot mode is a mode in which the position of the focus lens 32 once adjusted is fixed and photographing is performed at the focus lens position, whereas the continuous mode is a mode in which the position of the focus lens 32 is fixed. In this mode, the focus lens position is adjusted according to the subject. Various modes set by the operation unit 28 are sent to the camera control unit 21, and the operation of the entire camera 1 is controlled by the camera control unit 21. The shutter release button includes a first switch SW1 that is turned on when the button is half-pressed and a second switch SW2 that is turned on when the button is fully pressed.

  Next, the image sensor 22 according to the present embodiment will be described.

  FIG. 2 is a front view showing the imaging surface of the image sensor 22, and FIG. 3 is a front view schematically showing the arrangement of the focus detection pixels 222a and 222b by enlarging the III part of FIG.

  As shown in FIG. 3, the imaging element 22 of the present embodiment includes a green pixel G having a color filter in which a plurality of imaging pixels 221 are two-dimensionally arranged on the plane of the imaging surface and transmit a green wavelength region. A red pixel R having a color filter that transmits a red wavelength region and a blue pixel B having a color filter that transmits a blue wavelength region are arranged in a so-called Bayer Arrangement. That is, in four adjacent pixel groups 223 (dense square lattice arrangement), two green pixels are arranged on one diagonal line, and one red pixel and one blue pixel are arranged on the other diagonal line. The image sensor 22 is configured by repeatedly arranging the pixel group 223 on the imaging surface of the image sensor 22 in a two-dimensional manner with the Bayer array pixel group 223 as a unit.

  The unit pixel group 223 may be arranged in a dense hexagonal lattice arrangement other than the dense square lattice shown in the figure. Further, the configuration and arrangement of the color filters are not limited to this, and an arrangement of complementary color filters (green: G, yellow: Ye, magenta: Mg, cyan: Cy) can also be adopted.

  FIG. 4 is an enlarged front view showing one of the imaging pixels 221, and FIG. 6 is a cross-sectional view. One imaging pixel 221 includes a micro lens 2211, a photoelectric conversion unit 2212, and a color filter (not shown), and a photoelectric conversion unit is formed on the surface of the semiconductor circuit substrate 2213 of the image sensor 22 as shown in the cross-sectional view of FIG. 2212 is built in and a microlens 2211 is formed on the surface. The photoelectric conversion unit 2212 is configured to receive an imaging light beam that passes through an exit pupil (for example, F1.0) of the photographing optical system by the micro lens 2211, and receives the imaging light beam.

  In addition, on the imaging surface of the imaging element 22, focus detection pixel rows 22 a to 22 e in which focus detection pixels 222 a and 222 b are arranged instead of the above-described imaging pixel 221 are provided. As shown in FIG. 3, one focus detection pixel column includes a plurality of focus detection pixels 222 a and 222 b that are alternately arranged adjacent to each other in a horizontal row (22 a to 22 e). In the present embodiment, the focus detection pixels 222a and 222b are densely arranged without providing a gap at the position of the green pixel G and the blue pixel B of the image pickup pixel 221 arranged in the Bayer array.

  Note that the positions of the focus detection pixel rows 22a to 22e shown in FIG. 2 are not limited to the illustrated positions, and may be any one, two, three, or four locations, and more than six locations. It can also be arranged at the position. FIG. 3 shows an example in which the focus detection pixel array is configured by 16 focus detection pixels 222a and 222b, but the number of focus detection pixels configuring the focus detection pixel array is limited to this example. Is not to be done.

  FIG. 5A is an enlarged front view showing one of the focus detection pixels 222a, and FIG. 7A is a cross-sectional view of the focus detection pixel 222a. FIG. 5B is an enlarged front view showing one of the focus detection pixels 222b, and FIG. 7B is a cross-sectional view of the focus detection pixel 222b. As shown in FIG. 5A, the focus detection pixel 222a includes a micro lens 2221a and a semicircular photoelectric conversion unit 2222a. As shown in the cross-sectional view of FIG. A photoelectric conversion portion 2222a is formed on the surface of the semiconductor circuit substrate 2213, and a micro lens 2221a is formed on the surface. The focus detection pixel 222b includes a micro lens 2221b and a photoelectric conversion unit 2222b as shown in FIG. 5B, and a semiconductor of the image sensor 22 as shown in a cross-sectional view of FIG. 7B. A photoelectric conversion unit 2222b is formed on the surface of the circuit board 2213, and a microlens 2221b is formed on the surface. Then, as shown in FIG. 3, these focus detection pixels 222a and 222b are alternately arranged adjacent to each other in a horizontal row, thereby forming focus detection pixel rows 22a to 22e shown in FIG.

  The photoelectric conversion units 2222a and 2222b of the focus detection pixels 222a and 222b have such a shape that the microlenses 2221a and 2221b receive a light beam that passes through a predetermined region (eg, F2.8) of the exit pupil of the photographing optical system. Is done. Further, the focus detection pixels 222a and 222b are not provided with color filters, and their spectral characteristics are the total of the spectral characteristics of a photodiode that performs photoelectric conversion and the spectral characteristics of an infrared cut filter (not shown). ing. However, it may be configured to include one of the same color filters as the imaging pixel 221, for example, a green filter.

  In addition, although the photoelectric conversion units 2222a and 2222b of the focus detection pixels 222a and 222b illustrated in FIGS. 5A and 5B have a semicircular shape, the shapes of the photoelectric conversion units 2222a and 2222b are not limited thereto. Other shapes such as an elliptical shape, a rectangular shape, and a polygonal shape can also be used.

  Here, a so-called phase difference detection method for detecting the focus state of the photographing optical system based on the pixel outputs of the focus detection pixels 222a and 222b described above will be described.

  FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 3. The focus detection pixels 222 a-1, 222 b-1, 222 a-2, and 222 b-2 that are arranged in the vicinity of the photographing optical axis L 1 and adjacent to each other are It shows that light beams AB1-1, AB2-1, AB1-2, and AB2-2 irradiated from the distance measuring pupils 341 and 342 of the exit pupil 34 are received, respectively. 8 illustrates only the focus detection pixels 222a and 222b that are located in the vicinity of the photographing optical axis L1, but other focus detection pixels other than the focus detection pixels illustrated in FIG. 8 are illustrated. In the same manner, the light beams emitted from the pair of distance measuring pupils 341 and 342 are respectively received.

  Here, the exit pupil 34 is an image set at a distance D in front of the microlenses 2221a and 2221b of the focus detection pixels 222a and 222b arranged on the planned focal plane of the photographing optical system. The distance D is a value uniquely determined according to the curvature and refractive index of the microlens, the distance between the microlens and the photoelectric conversion unit, and the distance D is referred to as a distance measurement pupil distance. The distance measurement pupils 341 and 342 are images of the photoelectric conversion units 2222a and 2222b respectively projected by the micro lenses 2221a and 2221b of the focus detection pixels 222a and 222b.

  In FIG. 8, the arrangement direction of the focus detection pixels 222a-1, 222b-1, 222a-2, 222b-2 coincides with the arrangement direction of the pair of distance measuring pupils 341, 342.

  As shown in FIG. 8, the microlenses 2221a-1, 2221b-1, 2221a-2, and 2221b-2 of the focus detection pixels 222a-1, 222b-1, 222a-2, and 222b-2 are photographic optical systems. Near the planned focal plane. The shapes of the photoelectric conversion units 2222a-1, 2222b-1, 2222a-2, 2222b-2 arranged behind the micro lenses 2221a-1, 2221b-1, 2221a-2, 2221b-2 are the same as the micro lenses 2221a-1, 2221b-1, 2221a-2, 2221b-2. Projected onto the exit pupil 34 separated from the lenses 2221a-1, 2221b-1, 2221a-2, 2221b-2 by the distance measurement distance D, and the projection shape forms the distance measurement pupils 341, 342.

  In other words, on the exit pupil 34 at the distance measurement distance D, the microlens and the photoelectric conversion unit in each focus detection pixel so that the projection shapes (the distance measurement pupils 341 and 342) of the photoelectric conversion unit of each focus detection pixel match. Is determined, and the projection direction of the photoelectric conversion unit in each focus detection pixel is thereby determined.

  As shown in FIG. 8, the photoelectric conversion unit 2222a-1 of the focus detection pixel 222a-1 is formed on the microlens 2221a-1 by the light beam AB1-1 that passes through the distance measuring pupil 341 and goes to the microlens 2221a-1. A signal corresponding to the intensity of the image to be output is output. Similarly, the photoelectric conversion unit 2222a-2 of the focus detection pixel 222a-2 passes through the distance measuring pupil 341, and the intensity of the image formed on the microlens 2221a-2 by the light beam AB1-2 toward the microlens 2221a-2. The signal corresponding to is output.

  Further, the photoelectric conversion unit 2222b-1 of the focus detection pixel 222b-1 passes through the distance measuring pupil 342, and the intensity of the image formed on the microlens 2221b-1 by the light beam AB2-1 directed to the microlens 2221b-1. Output the corresponding signal. Similarly, the photoelectric conversion unit 2222b-2 of the focus detection pixel 222b-2 passes through the distance measuring pupil 342, and the intensity of the image formed on the microlens 2221b-2 by the light beam AB2-2 toward the microlens 2221b-2. The signal corresponding to is output.

  Then, a plurality of the above-described two types of focus detection pixels 222a and 222b are arranged in a straight line as shown in FIG. 3, and the outputs of the photoelectric conversion units 2222a and 2222b of the focus detection pixels 222a and 222b are converted into the distance measurement pupil 341, respectively. Of the pair of images formed on the focus detection pixel row by the focus detection light fluxes that pass through each of the distance measurement pupil 341 and the distance measurement pupil 342. Data on the distribution is obtained. Then, by applying an image shift detection calculation process such as a correlation calculation process or a phase difference detection process to the intensity distribution data, an image shift amount by a so-called phase difference detection method can be detected.

  Then, a conversion calculation is performed on the obtained image shift amount according to the center-of-gravity interval of the pair of distance measuring pupils, thereby obtaining a current focal plane with respect to the planned focal plane (the focal point corresponding to the position of the microlens array on the planned focal plane). The deviation of the focal plane at the detection position, that is, the defocus amount can be obtained.

  The calculation of the image shift amount by the phase difference detection method and the calculation of the defocus amount based thereon are executed by the camera control unit 21.

  Further, the camera control unit 21 reads the output of the imaging pixel 221 of the imaging element 22 and calculates a focus evaluation value based on the read pixel output. This focus evaluation value can be obtained by, for example, extracting a high frequency component of an image output from the imaging pixel 221 of the imaging element 22 using a high frequency transmission filter and integrating the extracted high frequency component. It can also be obtained by extracting high-frequency components using two high-frequency transmission filters having different cutoff frequencies and integrating them.

  Then, the camera control unit 21 sends a control signal to the lens control unit 37 to drive the focus lens 32 at a predetermined sampling interval (distance) to obtain a focus evaluation value at each position, and the focus evaluation value is maximum. The focus detection by the contrast detection method is performed in which the position of the focus lens 32 is determined as the in-focus position. Note that this in-focus position is obtained when, for example, when the focus evaluation value is calculated while driving the focus lens 32, the focus evaluation value rises twice and then moves down twice. Can be obtained by performing an operation such as interpolation using the focus evaluation value.

  Here, in FIG. 2, the first area and the second area in the shooting screen are displayed in correspondence with the image sensor 22 (note that the area surrounded by the one-dot chain line shown in FIG. 1 area, and the outer area located around the first area is the second area). The first area of the shooting screen corresponds to a part of the image sensor 22 having the imaging pixel 221 and the focus detection pixels 222a and 222b constituting the focus detection pixel rows 22a to 22e. The focus state of the optical system can be detected by the phase difference detection method and the contrast detection method. Further, as shown in FIG. 2, the second area of the shooting screen is located around the first area of the shooting screen, and corresponds to a portion of the image pickup device 22 having only the image pickup pixel 221. Therefore, in the second region, the focus state of the optical system can be detected only by the contrast detection method.

  Next, an operation example of the camera 1 according to the present embodiment will be described. FIG. 9 is a flowchart showing an operation example of the camera 1 according to the present embodiment. The following operation is started when the camera 1 is turned on. In the following, a mode is selected in which the face area of the person is detected and the focus state in the detected face area of the person is detected, and the position of the focus lens 32 that has been adjusted once is selected. A description will be given by exemplifying a case where the mode for fixing and shooting at the focus lens position is selected.

  Further, an operation example of the camera 1 according to the present embodiment will be described below with reference to FIGS. 10 and 11. Here, FIG. 10 is a diagram for explaining a focus detection method when a specific subject is not specified, and an example of a shooting screen displayed by the electronic viewfinder 26 when a specific subject is not specified. Is shown. FIG. 11 is a diagram for explaining a focus detection method when a specific subject is specified, and an example of a shooting screen displayed by the electronic viewfinder 26 when the specific subject is specified. Show.

  In the example shown in FIGS. 10 and 11, as shown in FIG. 10, 16 focus detection areas AFP (area surrounded by a broken line in FIG. 10) are set in the shooting screen. In the focus detection area AFP, it is possible to calculate the defocus amount by the phase difference detection method. In FIG. 10, 16 focus detection areas AFP are illustrated, but the number of focus detection areas AFP set on the shooting screen is not limited to 16, but 15 or less. Or 17 or more. In FIG. 10, for convenience of explanation, the 16 focus detection areas AFP are indicated by broken lines, but in this embodiment, as shown in FIG. 11, the focus detection areas AFP are not displayed on the shooting screen. Can be configured.

  First, in step S101, generation of a through image by the camera control unit 21 and display of a through image by the electronic viewfinder 26 of the observation optical system are started. Specifically, an exposure operation is performed by the imaging element 22, and pixel data of the imaging pixel 221 is read by the camera control unit 21. Then, the camera control unit 21 generates a through image based on the read data, and the generated through image is sent to the liquid crystal drive circuit 25 and displayed on the electronic viewfinder 26 of the observation optical system. As a result, the photographer can visually recognize the image of the subject through the eyepiece lens 27. In the present embodiment, as shown in FIGS. 10 and 11, the camera control unit 21 superimposes the first area mark 50 indicating the first area in the shooting screen on the image of the subject, and the first area mark 50. A through image on which is superimposed is displayed by the electronic viewfinder 26. Note that the generation of the through image and the display of the through image are repeatedly executed at predetermined intervals.

  In step S102, the camera control unit 21 divides the shooting screen into a plurality of regions, and performs multi-division metering (multi-pattern metering) in which photometry is performed for each of the divided regions, and the luminance value Bv of the entire shooting screen is calculated. Is done. Then, the camera control unit 21 determines the light receiving sensitivity Sv, the exposure time Tv, and the aperture Av so that a proper exposure can be obtained on the entire shooting screen based on the calculated luminance value Bv of the entire shooting screen. In the present embodiment, when the light receiving sensitivity Sv and the exposure time Tv are preferentially changed, and only by changing the light receiving sensitivity Sv and the exposure time Tv, a proper exposure cannot be obtained on the entire photographing screen, the aperture Av is set. Be changed.

  In step S <b> 103, the camera control unit 21 performs processing for detecting a human face area from the captured image captured by the image sensor 22. For example, the camera control unit 21 detects the face area of the person from the captured image by comparing the template image data (reference image data) of the person's face stored in advance with the captured image. can do. For example, in the example shown in FIG. 11, the face areas A and B of the person are detected within the range of the first area mark 50 indicating the first area, and exceed the range of the first area mark 50 indicating the first area. Within the range, a human face area C is detected. It should be noted that the detection of the human face area in step S103 is repeated at predetermined intervals.

  In step S104, a recognition frame 52 for recognizing the person's face area is superimposed on the person's face area detected in step S103 by the camera control unit 21, and the recognition frame 52 is superimposed on the person's face area. The image is displayed by the electronic viewfinder 26 as shown in FIG. For example, in the example shown in FIG. 11, the face areas A, B, and C of three persons are detected, and the face areas of each person are compared with the detected face areas A, B, and C of all persons. A recognition frame 52 that matches the positions and sizes of A, B, and C is superimposed.

  If no human face area is detected in step S103, a mark indicating the focus detection area AFP preset by the photographer may be displayed, or the focus may be displayed at the center of the shooting screen. In the detection mode, a mark indicating the focus detection area AFP at the center of the shooting screen may be displayed. Moreover, it is good also as a structure which does not display the mark which shows such a focus detection area.

  In step S105, the camera control unit 21 determines whether the shutter release button provided in the operation unit 28 is half-pressed (the first switch SW1 is turned on). If the shutter release button has been pressed halfway, the process proceeds to step S106. On the other hand, if the shutter release button has not been pressed halfway, the process returns to step S102, and exposure control and detection of the human face area are repeatedly executed.

  In step S106, the camera control unit 21 determines whether a human face area is detected. If the face area of the person is detected, the process proceeds to step S116 to detect the focus state in the detected face area of the person. On the other hand, if the face area of the person is not detected, In order to detect the focus state within the range of the one area mark 50, the process proceeds to step S107.

  In step S107, since the face area of the person has not been detected, the camera control unit 21 sets the area for focus detection as the first area where focus detection can be performed by the phase difference detection method. In subsequent step S108, the camera control unit 21 calculates the defocus amount by the phase difference detection method in the plurality of focus detection areas AFP set in the first region. For example, in the example shown in FIG. 10, 16 focus detection areas AFP are set in the first region, and the defocus amount is calculated in all 16 focus detection areas AFP.

  In step S109, the camera control unit 21 determines whether the defocus amount has been calculated. If the defocus amount can be calculated, it is determined that distance measurement is possible and the process proceeds to step S110. On the other hand, if the defocus amount cannot be calculated, it is determined that distance measurement is not possible and the process proceeds to step S115. . In the present embodiment, when there is at least one focus detection area in which the defocus amount can be calculated among the plurality of focus detection areas AFP set within the range indicated by the first region mark 50, defocusing is performed. When it is determined that the amount can be calculated, the process proceeds to step S110. On the other hand, when the defocus amount cannot be calculated in all the focus detection areas AFP set within the range indicated by the first region mark 50, the defocus amount is It is determined that it cannot be calculated, and the process proceeds to step S115. In the present embodiment, even if the defocus amount can be calculated, if the reliability of the calculated defocus amount is low, it is treated that the defocus amount cannot be calculated, and the process proceeds to step S115. I will do it. In the present embodiment, for example, when the subject has a low contrast, the subject is an ultra-low brightness subject, or the subject is an ultra-high brightness subject, it is determined that the reliability of the defocus amount is low. .

  Since it is determined in step S110 that the defocus amount has been calculated, the camera control unit 21 determines a focus detection area AFP for performing focus adjustment based on the defocus amount calculation result in step S108. Is done. For example, when the closest priority mode for focusing on the subject on the near side is selected, the camera control unit 21 selects the closest side among the plurality of focus detection areas AFP for which the defocus amount can be calculated. The focus detection area AFP is determined as a focus detection area AFP for performing focus adjustment. Further, the method for determining the focus detection area AFP for performing the focus adjustment is not limited to the above-described method. For example, the focus closest to the center of the shooting screen among the plurality of focus detection areas AFP for which the defocus amount can be calculated. The detection area AFP can also be determined as a focus detection area AFP for performing focus adjustment.

  In step S111, as shown in FIG. 10, the camera control unit 21 superimposes the focus detection mark 51 on the focus detection area AFP for performing the focus adjustment determined in step S110. Is displayed. Thereby, in this embodiment, the photographer can visually recognize which focus detection area AFP is the focus detection area AFP for performing focus adjustment.

  In step S112, the camera control unit 21 drives the focus lens 32 to the in-focus position based on the defocus amount calculated in the focus detection area AFP for performing focus adjustment determined in step S110. The required lens drive amount is calculated, and the calculated lens drive amount is sent to the focus lens drive motor 36 via the lens control unit 37. As a result, the focus lens driving motor 36 drives the focus lens 32 based on the calculated lens driving amount.

  When the driving of the focus lens 32 to the in-focus position is completed, the process proceeds to step S113, in-focus display is performed, and then in step S114, focus lock (processing for prohibiting driving of the focus lens 32) is performed. It is. The in-focus display in step S113 is performed by the electronic viewfinder 26, for example.

  If it is determined in step S109 that the defocus amount cannot be calculated, the process proceeds to step S115. In step S115, the camera control unit 21 performs a scan operation execution process for executing a scan operation. Here, the scan operation is a predetermined calculation of the defocus amount and the focus evaluation value by the phase difference detection method by the camera control unit 21 while the focus lens 32 is scan-driven by the focus lens drive motor 36. Thus, the detection of the in-focus position by the phase difference detection method and the in-focus position detection by the contrast detection method are performed simultaneously. In the following, the scan operation execution process according to the present embodiment will be described with reference to FIG. FIG. 12 is a flowchart showing a scan operation execution process according to the present embodiment.

  First, in step S201, the camera control unit 21 performs a scan operation start process. Specifically, the camera control unit 21 sends a scan drive start command to the lens control unit 37, and the lens control unit 37 drives the focus lens drive motor 36 based on the command from the camera control unit 21 to focus. The lens 32 is scan-driven along the optical axis L1. The direction in which the scan drive is performed is not particularly limited, and the scan drive of the focus lens 32 may be performed from the infinite end to the close end, or may be performed from the close end to the infinite end. Good.

  The camera control unit 21 reads out a pair of image data corresponding to the pair of images from the focus detection pixels 222a and 222b of the image sensor 22 while driving the focus lens 32, and based on this, a phase difference detection method Thus, the defocus amount is calculated and the reliability of the calculated defocus amount is evaluated, and the pixel output is read from the imaging pixel 221 of the imaging element 22 while the focus lens 32 is being driven. The focus evaluation value is calculated, and thereby the focus evaluation value at different focus lens positions is acquired, so that the focus position is detected by the contrast detection method.

  When performing the scanning operation, in order to detect the focus state in the first region, focus detection by the phase difference detection method and focus detection by the contrast detection method are performed in the first region. That is, when performing the scanning operation, focus detection by the contrast detection method is not performed in the second region. However, in the scanning operation, the focus detection by the contrast detection method may be performed in the second region in addition to the first region.

  In step S202, it is determined whether or not the defocus amount can be calculated by the phase difference detection method in the first region as a result of the scanning operation performed by the camera control unit 21. In the first area, if the defocus amount can be calculated by the phase difference detection method, it is determined that the distance can be measured, and the process proceeds to step S205. On the other hand, if the defocus amount cannot be calculated, the measurement is performed. It is determined that the distance is impossible, and the process proceeds to step S203.

  In step S203, as a result of the scanning operation performed by the camera control unit 21, it is determined whether or not the in-focus position has been detected by the contrast detection method in the first region. In the first region, if the in-focus position can be detected by the contrast detection method, the process proceeds to step S211. If the in-focus position cannot be detected, the process proceeds to step S204.

  In step S <b> 204, the camera control unit 21 determines whether the scan operation has been performed for the entire driveable range of the focus lens 32. If the scan operation is not performed for the entire driveable range of the focus lens 32, the process returns to step S202, and steps S202 to S204 are repeated to perform the scan operation, that is, while the focus lens 32 is scan-driven. A scanning operation for simultaneously executing the calculation of the defocus amount by the phase difference detection method and the detection of the in-focus position by the contrast detection method is continuously performed. On the other hand, if the scan operation has been completed for the entire driveable range of the focus lens 32, the process proceeds to step S215.

  As a result of executing the scanning operation, when it is determined in step S202 that the defocus amount can be calculated by the phase difference detection method in the first region, the process proceeds to step S205, and the camera control unit 21 performs the scanning operation. The stop process is performed. In step S206, it is determined whether or not a specific subject has been specified. As shown in FIG. 10, when the specific subject is not specified, the process proceeds to step S207, where the focus detection area AFP for performing focus adjustment is determined, and the focus detection area AFP for performing focus adjustment is focused on the focus detection area AFP. The detection mark 51 is superimposed and displayed by the electronic viewfinder 26. When a specific subject is specified in step S206, as shown in FIG. 11, the focus detection mark 53 is already superimposed at the position of the specified specific subject (details will be described later). ), The process proceeds to step S208.

  In step S208, the focus lens 32 is driven to the in-focus position based on the defocus amount calculated by the phase difference detection method. When the driving of the focus lens 32 to the in-focus position is completed, the process proceeds to step S209. After the focus display is performed, in step S210, the focus lock (processing for prohibiting the drive of the focus lens 32) is performed. Is called.

  If it is determined in step S203 that the in-focus position has been detected by the contrast detection method in step S203 as a result of executing the scanning operation, the process proceeds to step S211 and the camera control unit 21 performs the scanning operation. The stop process is performed. In step S212, as in step S206, it is determined whether or not a specific subject has been specified. As shown in FIG. 10, when the specific subject is not specified, the process proceeds to step S213, and the focus detection mark 51 is superimposed on the area where the in-focus position is detected, and is displayed by the electronic viewfinder 26. . In step S212, as in step S206, if the specific subject has been specified, the focus detection mark 53 has already been superimposed at the position of the specific subject, and the process directly proceeds to step S214.

  In step S214, the focus lens 32 is driven to the in-focus position based on the in-focus position detected in the first area. When the drive of the focus lens 32 to the in-focus position is completed, the process proceeds to step S209, where focus display is performed, and in step S210, focus lock (processing for prohibiting the drive of the focus lens 32) is performed.

  On the other hand, if it is determined in step S204 that the scan operation has been completed for the entire driveable range of the focus lens 32, the process proceeds to step S215. In step S215, as a result of performing the scanning operation, focus detection could not be performed by any of the phase difference detection method and the contrast detection method, so that the scanning operation end processing is performed, and then in step S216 Then, the camera control unit 21 performs an in-focus display. Note that the in-focus state display is performed by the electronic viewfinder 26, for example.

  Returning to FIG. 9, if it is determined in step S106 that a human face area has been detected, the process proceeds to step S116. In step S116, the camera control unit 21 specifies a specific subject for performing focus adjustment based on the face area of the person detected in step S103.

  For example, as shown in FIG. 11, when a plurality of human face areas are detected in step S <b> 103, the camera control unit 21 determines the face of the person with the largest size among the plurality of human face areas. The area is determined to be a main subject, and the face area of the person with the largest size is specified as a specific subject for focus detection. For example, in the example shown in FIG. 11, the face areas A, B, and C of three persons are detected, and the face area having the largest size among the face areas A, B, and C of these three persons. B is specified as a specific subject for performing focus detection. Note that the method for specifying a specific subject is not limited to the above method. For example, among the face areas of a plurality of persons, a face area of a person located closest to the center of the shooting screen is used for focus detection. The specific subject may be specified, or the specific subject may be specified based on a combination of the size of the face area of the person and the position from the center of the shooting screen. In addition, when the photographer selects a person face area for focus detection from a plurality of person face areas via the operation unit 28, the face of the person selected by the photographer is selected. The region may be specified as a specific subject for performing focus detection.

  In step S117, the focus detection mark 53 indicating the position of the specific subject is superimposed on the image of the specific subject specified in step S116 by the camera control unit 21, and the focus detection mark 53 is superimposed as shown in FIG. The through image is displayed by the electronic viewfinder 26. Thereby, the photographer can visually recognize a specific subject for focus detection via the electronic viewfinder 26. For example, in the example shown in FIG. 11, among the face areas A, B, and C of three persons, the face area B located in the center of the shooting screen is specified as a specific subject for performing focus detection. As shown in FIG. 11, the focus detection mark 53 is superimposed on the image of the face area B specified as the specific subject. Note that the focus detection mark 53 indicating the specific subject is displayed so as to be superimposed on the image of the specific subject even when the specific subject exists in a range beyond the range indicated by the first area mark 50. For example, in the example shown in FIG. 11, even when the face area of the person specified as the specific subject is the face area C, the focus detection mark 53 is superimposed on the image of the face area C of the person specified as the specific subject. Is done.

  Next, in step S118, the camera control unit 21 determines whether or not the specific subject specified in step S116 exists in the first region where focus detection is possible by the phase difference detection method. If it is determined that the specific subject exists in the first area, the process proceeds to step S119 in order to perform focus detection by the phase difference detection method at the position of the specific subject in the first area. On the other hand, when it is determined that the specific subject exists in the second area where focus detection by the contrast detection method can be performed, focus detection by the contrast detection method is performed at the position of the specific subject in the second region. The process proceeds to step S121. For example, in the example shown in FIG. 11, since the face area B of the person located at the center of the shooting screen is specified as the specific subject, it is determined that the specific subject exists in the first region, and the process proceeds to step S119. In the example shown in FIG. 11, for example, when the face area C of the person located on the right side of the shooting screen is specified as the specific subject, it is determined that the specific subject exists in the second area, and step S121 is performed. Will proceed to.

  In step S119, since it is determined that the specific subject exists in the first area where focus detection can be performed by the phase difference detection method, the focus detection area AFP corresponding to the position of the specific subject in the first area. The focus detection by the phase difference detection method is performed. Specifically, first, the image sensor 22 receives light from the optical system, and the camera control unit 21 detects the focus detection pixel 222a in the focus detection area AFP corresponding to the position of the specific subject in the first region. , 222b, a pair of image data corresponding to the pair of images is read out. Then, the camera control unit 21 executes an image shift detection calculation process (correlation calculation process) based on the read pair of image data, and converts the calculated image shift amount into a defocus amount. The camera control unit 21 also evaluates the reliability of the calculated defocus amount, as in step S109.

  In step S120, as in step S109, it is determined whether the defocus amount has been calculated based on the defocus amount calculation result in step S119. If the defocus amount can be calculated, it is determined that distance measurement is possible and the process proceeds to step S122. On the other hand, if the defocus amount cannot be calculated, it is determined that distance measurement is not possible and the process proceeds to step S125. . In step S120, as in step S109, even if the defocus amount can be calculated, if the reliability of the calculated defocus amount is low, the defocus amount cannot be calculated. Is called.

  In step S118, the specific subject for focus detection does not exist in the first region where focus detection can be performed using the phase difference detection method, but exists in the second region where focus detection can be performed using the contrast detection method. If it is determined, the process proceeds to step S121. In step S121, the camera control unit 21 performs focus detection by the contrast detection method at the position of the specific subject existing in the second area. Specifically, the camera control unit 21 repeatedly calculates a focus evaluation value at a position of a specific subject existing in the second region while driving the focus lens 32 at a predetermined sampling interval, thereby obtaining a focus evaluation value. The position of the focus lens 32 at which the maximum value is detected as the in-focus position. After detecting the in-focus position, the process proceeds to step S122.

  In step S122, the camera control unit 21 drives the focus lens 32 to the in-focus position based on the defocus amount calculated in step S119 or the in-focus position detected in step S121. A lens driving amount is calculated, and the focus lens 32 is driven based on the calculated lens driving amount. When the drive of the focus lens 32 to the in-focus position is completed, the process proceeds to step S123, and after focus display is performed, in step S124, the focus lock (processing for prohibiting the drive of the focus lens 32) is performed. Is called.

  In step S120, if the defocus amount cannot be calculated at the position of the specific subject in the first area, the process proceeds to step S125. In step S125, a scan operation execution process is performed as in step S115. In the scan operation execution process in step S125, a specific subject for focus adjustment is specified, and a focus detection mark 53 is displayed at a position corresponding to the specific subject. Therefore, when the defocus amount is calculated or the focus position is detected in the scan operation, the focus detection area where the defocus amount is calculated or the focus area where the focus position is detected Is not displayed (step S206 = No, step S212 = No).

  As described above, in the present embodiment, when a specific subject such as a person's face is not specified when the shutter release button is pressed halfway, the first region in which focus detection can be performed by the phase difference detection method. The focus detection by the phase difference detection method is performed. As described above, in the present embodiment, when a specific subject is not specified, focus detection is performed by the phase difference detection method in which the time required for focus detection is short compared to the focus detection by the contrast detection method. When the subject is not specified, the time required for focus detection can be shortened, and the followability to a subject such as a moving object can be improved.

  In the present embodiment, when a specific subject is specified when the shutter release button is half-pressed, focus detection is performed on the specific subject regardless of the position of the specific subject. Specifically, when the specific subject exists in the first area where focus detection can be performed by the phase difference detection method, focus detection by the phase difference detection method is performed at the position of the specific subject existing in the first area. On the other hand, when the specific subject exists in the second region where focus detection can be performed by the contrast detection method, focus detection by the contrast detection method is performed at the position of the specific subject existing in the second region. Thus, in this embodiment, when a specific subject is specified, the focus state is changed at the position of the specific subject regardless of whether the specific subject exists in the first region or the second region. Therefore, when a specific subject is specified, it is possible to appropriately capture an image focused on the specific subject.

  In the present embodiment, when the specific subject moves from the first area where focus detection is possible using the phase difference detection method to the second area where focus detection is possible using the contrast detection method, the phase difference detection method is used. The focus detection is performed by switching from the focus detection by the focus detection to the focus detection by the contrast detection method. On the other hand, when the specific subject moves from the second region where the focus detection by the contrast detection method can be performed to the first region where the focus detection by the phase difference detection method can be performed, the focus detection by the contrast detection method. Then, focus detection is performed by switching to focus detection by the phase difference detection method.

  Furthermore, in the present embodiment, in addition to the focus detection by the phase difference detection method being possible in the first region, the focus detection by the contrast detection method is also possible, but in the first region, the phase difference is being detected. Focus detection by the detection method is performed with priority. As described above, in the present embodiment, in the first region, focus detection by the phase difference detection method is performed with priority, so that the time required for focus detection can be shortened, and the followability to a specific subject such as a moving object can be reduced. Can be improved.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, in the above-described embodiment, when a specific subject is not specified, a focus detection area AFP for performing focus adjustment is determined from a plurality of focus detection areas AFP as shown in FIG. Although the configuration in which the focus lens 32 is driven based on the determined defocus amount in the focus detection area AFP is illustrated, the configuration is not particularly limited to this configuration. For example, a plurality of values calculated in a plurality of focus detection areas AFP are used. The average value of the defocus amount may be calculated, and the focus lens 32 may be driven based on the calculated average value of the defocus amount. Further, the defocus amount is weighted according to the position of the focus detection area AFP in the photographing screen and the reliability of the calculated defocus amount, and the focus lens 32 is based on the average value of the weighted defocus amount. It is good also as a structure which drives.

  In the above-described embodiment, a human face area is detected and the detected human face area is specified as a specific subject for focus detection. However, the specific subject is not limited to the human face area. For example, a person's eye area or an animal face area can be specified as the specific subject. Further, a template image corresponding to a target specified by a photographer's manual operation or by subject recognition processing by the camera control unit 21 is generated, and the degree of coincidence with the generated template image is predetermined from the captured images. A configuration in which a search for an area as described above is performed, and when a tracking operation for repeatedly recognizing an area having a matching degree equal to or higher than a predetermined value is performed, a subject that is a tracking target in the tracking operation is specified as a specific subject. It is good.

  Further, in the above-described embodiment, as shown in FIG. 10, when a plurality of focus detection areas AFP are set in advance in the first area, and the specific subject exists in the first area, the first area The configuration for calculating the defocus amount in the focus detection area AFP corresponding to the position of the specific subject in the region is exemplified, but the configuration is not limited to this configuration. For example, the focus detection area AFP is not set in advance. The defocus amount at the position of the specific subject may be calculated based on the outputs of the focus detection pixels 222a and 222b corresponding to the position of the specific subject.

  In the above-described embodiment, when the defocus amount is calculated by the phase difference detection method or the in-focus position is detected by the contrast detection method when performing the scan operation, the scan operation is stopped. Then, the configuration for driving the focus lens 32 to the in-focus position is illustrated, but the configuration is not limited to this configuration. For example, even when the defocus amount is calculated or the in-focus position is detected, The scanning operation is continued until the focus lens 32 scans the predetermined scan range, and after scanning the predetermined scan range, the focus lens 32 is based on the calculated defocus amount and the detected focus position. It is good also as a structure which drives.

  The camera 1 of the above-described embodiment is not particularly limited. For example, the present invention is applied to other optical devices such as a digital video camera, a single-lens reflex digital camera, a lens-integrated digital camera, and a camera for a mobile phone. May be.

DESCRIPTION OF SYMBOLS 1 ... Digital camera 2 ... Camera body 21 ... Camera control part 22 ... Imaging device 221 ... Imaging pixel 222a, 222b ... Focus detection pixel 28 ... Operation part 3 ... Lens barrel 32 ... Focus lens 36 ... Focus lens drive motor 37 ... Lens Control unit 50 ... first area marks 51, 53 ... focus detection mark 52 ... identification frame

Claims (8)

And that an imaging device to output the signal by imaging an image formed by an optical system having a focusing optical system,
A specifying unit for specifying a specific subject from an image based on a signal output from the image sensor;
Deviation amount between the focus position of the focus adjustment optical system and the position of the focus adjustment optical system where the image by the optical system in the first region of the image based on the signal output from the image pickup element is focused on the image pickup element A first detection unit that detects a signal based on a signal output from the imaging device ;
The in- focus position of the focusing optical system where the image in the first region of the image based on the signal output from the image sensor and the second region other than the first region is in focus on the image sensor is determined from the image sensor. A second detector for detecting based on the output signal;
When the specific object is not specified by the specifying unit, the first region is set as a region for detecting the position of the focus adjusting optical system, and when the shift amount cannot be detected by the first detecting unit, the focus adjusting optical system is Detecting the shift amount by the first detector while detecting the in- focus position by the second detector while moving,
When a specific subject is specified in the first region by the specifying unit , the shift amount is detected by the first detection unit, and the specific subject is specified in the second region by the specifying unit. And a control unit that detects the in- focus position by the second detection unit. The focus detection apparatus according to claim 1,
Wherein, by the first detector and the second detector while moving the pre SL focal optics to detect the position of the focusing optical system, the shift amount is detected by the first detection unit And a focus detection device that moves the focus adjustment optical system based on the shift amount when the in-focus position is detected by the second detection unit . The focus detection apparatus according to claim 1 or 2,
Wherein the control unit, when it is detected that the shift amount by the first detection unit, based on the amount of deviation by moving the focal optics, when it is detected that the focus position by the second detector A focus detection apparatus that moves the focus adjustment optical system based on a detection result of the second detection unit. The focus detection apparatus according to any one of claims 1 to 3,
The imaging element has a focus detection pixel and an imaging pixel,
The first detection unit, based on the signal output from the pre-Symbol focus detection pixels to detect the shift amount, the second detector is based on the contrast of the image based on the signal output from the pre-Symbol imaging pixels A focus detection device for detecting the in- focus position . The focus detection apparatus according to any one of claims 1 to 4,
Wherein, if a particular subject are specified by the specifying unit, the focal optics engagement of the specific subject in the first detector or the second detector is focused on the imaging device A focus detection device that detects the focal position. The focus detection device according to any one of claims 1 to 5,
A selection unit for selecting a subject from an image based on a signal output from the image sensor;
The focus detection device that specifies the subject selected by the selection unit as a specific subject. The focus detection apparatus according to any one of claims 1 to 6,
With a display,
The focus detection apparatus, wherein the display unit superimposes and displays an image indicating the first region on an image obtained through the optical system.   An imaging device comprising the focus detection device according to claim 1.

Images