JP2011155505A - Imaging apparatus, method of controlling the same, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a user to recognize a focusing position with accuracy even in focus adjustment. <P>SOLUTION: Focus adjustment means that carry out focus adjustment and an imaging element 14 are provided. A system controller 50 generates static image data based on image data imaged by the imaging element 14, and superposes information indicating a focusing position onto the static image data to display the static image data on an image display 28 when the focus adjustment means adjust the focus point of an object. In addition, detection means that detect a wobble amount of an imaging apparatus is provided. Any one display position of the static image data and information indicating the focusing position is moved depending on the detected wobble amount. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique for presenting a focus position by a focus adjustment function to a user.

  In a compact camera, a photographing style is generally used in which framing and photographing are performed using a so-called live view display in which a through image of an image sensor is displayed on an external display device instead of an optical viewfinder. Various techniques for realizing a live view even with a digital single-lens reflex camera have been proposed (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2006-261783

  However, in order to perform a so-called live view display in which a digital single-lens reflex camera displays a through image of an image sensor on an external display device, it is necessary to perform mirror up in order to guide a light beam from a photographing lens to the image sensor. On the other hand, in order to perform the phase difference AF, it is necessary to perform mirror down in order to guide the light beam from the photographing lens to the focus detection unit of the phase difference AF. For this reason, live view display cannot be performed during phase difference AF, and the focus position cannot be referred to on the monitor during the AF operation.

  Therefore, an object of the present invention is to make it possible to accurately grasp the in-focus position even during focus adjustment.

  An imaging apparatus according to the present invention includes an imaging unit, a focus adjustment unit that performs focus adjustment, a generation unit that generates still image data based on image data captured by the imaging unit, and a focus adjustment by the focus adjustment unit. And a display control means for displaying on the display means by superimposing information indicating the in-focus position on the still image data.

  According to the present invention, the focus position is accurately displayed even during the focus adjustment because the information indicating the focus position is superimposed and displayed on the still image data based on the image data captured by the imaging unit during the focus adjustment. It becomes possible to grasp.

It is the perspective view which looked at the digital single-lens reflex camera which concerns on embodiment of this invention from the front side. It is the figure which looked at the digital single-lens reflex camera which concerns on embodiment of this invention from the upper surface side. It is the figure which looked at the digital single-lens reflex camera which concerns on embodiment of this invention from the back side. 1 is a block diagram illustrating an electrical configuration of a digital single-lens reflex camera according to an embodiment of the present invention. It is a flowchart which shows the live view display operation | movement in embodiment of this invention. It is a figure which shows the example of a display of the image display part in live view display. It is a flowchart which shows the process of the subroutine of S306 of FIG. It is a flowchart which shows the operation | movement of the correction process of the display position in the 1st Embodiment of this invention. It is a figure which shows the example of a display which shifted still image data by the correction process of the display position shown in FIG. It is a flowchart which shows the operation | movement of the correction process of the display position in the 2nd Embodiment of this invention. It is a figure which shows the example of a display which shifted the ranging frame by the correction process of the display position shown in FIG. It is a flowchart which shows the operation | movement of the correction process of the display position in the 3rd Embodiment of this invention. It is a flowchart which shows the operation | movement of the correction process of the display position in the 4th Embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments to which the invention is applied will be described in detail with reference to the accompanying drawings.

  FIGS. 1-1 to 1-3 are views showing the external appearance of a digital single-lens reflex camera (hereinafter simply referred to as a camera) according to an embodiment of the present invention. More specifically, FIG. 1-1 is a perspective view of the camera viewed from the front side, and shows a state in which the photographing lens unit is removed. FIG. 1-2 is a view of the camera as viewed from the upper surface side. FIG. 1-3 is a view of the camera as seen from the back side. The camera has a configuration that is an application example of the imaging apparatus of the present invention.

  In FIG. 1, reference numeral 100 denotes a camera body, which is provided with a grip portion 1102 that protrudes forward so that a user can easily hold the camera stably during shooting. On the front side of the camera, reference numeral 1105 denotes a lens mount, and a detachable taking lens unit can be fixed to the camera body. The mount contact 1104 has a function of supplying control power, a status signal, a data signal, and the like between the camera body and the photographing lens unit and supplying power to the photographing lens unit. Reference numeral 1107 denotes a lens lock release button that is pushed in when removing the photographing lens unit. Reference numeral 1103 denotes a mirror box arranged in the camera casing, and the light beam that has passed through the photographing lens unit is guided here. An external terminal lid 1108 that can be opened and closed is provided on the side surface opposite to the grip portion 1102. Inside the external terminal lid 1108, a video signal output jack and a USB output connector are housed as external interfaces.

  In FIG. 1-2, a shutter button 1206 serving as a start switch for starting shooting and a main electronic dial for setting a shutter speed and a lens aperture value according to an operation mode at the time of shooting are provided on the grip unit 1102 on the upper side of the camera. 1205 is arranged. The shutter button 1206 is configured such that SW1 (63 in FIG. 2 described later) is turned on in the first stroke, and SW2 (64 in FIG. 2 described later) is turned on in the second stroke. A flash unit 1101 that pops up with respect to the camera body, an accessory shoe 1202 for attaching a flash, and a flash contact 1201 are arranged at the upper center of the camera, and a shooting mode dial 1203 is arranged from the upper right of the camera. Reference numeral 1204 denotes a power switch for starting or stopping the operation of the camera.

  1-3, a finder eyepiece window 1303 and a liquid crystal monitor (image display unit) 28 as display means are provided on the back side of the camera. As setting buttons arranged on the rear side of the camera, a DISP button 1302 for performing operations such as switching between display / non-display of the liquid crystal monitor, a MENU button 1301 for performing operations such as calling up a menu screen, reproduction of captured image data, etc. A playback button 1309 for performing an operation, an erasing button 1310 for performing an operation such as erasing a captured image, a live view button 1308 for starting and ending a live view, a ranging point selection button 1305, an AE lock button 1304, and an exposure correction setting There is a button 1307.

  The live view button 1308 is pressed while the camera is turned on. Thereby, the viewfinder observation state in which the subject is observed from the viewfinder eyepiece window 1303 and the live view state in which the output of the image sensor 14 is displayed on the image display unit 28 as a live view image can be switched to each other. The imaging element 14 is a configuration that is an application example of the imaging means of the present invention.

  FIG. 2 is a block diagram showing an electrical configuration of the camera according to the embodiment of the present invention. In FIG. 2, reference numeral 100 denotes a camera body. Reference numeral 1 denotes a main mirror. The main mirror 1 is a movable mirror, and is obliquely arranged in the photographing optical path (mirror down) during the viewfinder observation state and the phase difference AF operation, thereby preventing light from entering the image sensor 14. On the other hand, in the live view state and the photographing state, it is retracted out of the photographing optical path (mirror up). The main mirror 1 is a half mirror, and when it is obliquely arranged in the photographing optical path, it transmits about half of the light beam from the subject to a focus detection optical system described later.

  Reference numeral 2 denotes a focusing plate, on which an optical image of a subject formed by a photographing lens 301 described later is projected. Reference numeral 3 denotes a sub-mirror, which folds the light beam transmitted through the oblique main mirror 1 and guides it toward a focus detection unit 8 described later. The sub mirror 3 is a movable mirror, and is interlocked with the main mirror 1 and is obliquely installed in the photographing optical path during the finder observation state and the phase difference AF operation, and retracts out of the photographing optical path in the live view state and the photographing state.

  Reference numeral 4 denotes a finder optical path changing pentaprism. Reference numeral 5 denotes an eyepiece provided in the viewfinder eyepiece window 1303. Reference numerals 6 and 7 are a photometric lens and a photometric sensor for measuring subject luminance in the viewfinder observation screen, respectively. Since the photometric sensor 7 has a known logarithmic compression circuit inside, its output is logarithmically compressed. It will be a thing. Reference numeral 8 denotes a known phase difference type focus detection unit.

  Reference numeral 14 denotes an image sensor such as a CCD or CMOS. The image sensor 14 is supported by a shake correction control unit 132 so as to be displaceable in the vertical and horizontal directions, and functions as a mechanical shake correction unit that corrects a shake detected by a shake detection unit 131 described later. Reference numeral 11 denotes a mirror position detection unit composed of a photo interrupter, a photo reflector, or a switch that is mechanically turned on / off, and detects that the main mirror 1 is at a predetermined position. When the mirror up or mirror down control is performed, the mirror position detector 11 checks whether the mirror is at a predetermined position.

  Reference numeral 9 denotes a focal plane shutter. In the live view state, the focal plane shutter 9 is controlled so as to be held open in order to guide the light beam from the photographing lens unit 300 to the image sensor 14. Reference numeral 16 denotes an A / D converter that converts an analog signal output from the image sensor 14 into a digital signal. A timing generation circuit 18 supplies a clock signal and a control signal to the image sensor 14, the A / D converter 16, and the D / A converter 26, and is controlled by the memory control circuit 22 and the system controller 50.

  An image processing circuit 20 performs predetermined pixel interpolation processing and color conversion processing on the data from the A / D converter 16 or the data from the memory control circuit 22. In the image processing circuit 20, predetermined calculation processing is performed using image data captured by the image sensor 14, and white balance adjustment processing is also performed based on the obtained calculation results and camera setting values.

  A memory control circuit 22 controls the A / D converter 16, the timing generation circuit 18, the image processing circuit 20, the image display memory 24, the D / A converter 26, the first memory 30, and the compression / decompression circuit 32. To do. The data of the A / D converter 16 passes through the image processing circuit 20 and the memory control circuit 22, or the data of the A / D converter 16 passes directly through the memory control circuit 22, and the image display memory 24 or the first memory. 30 is written.

  Reference numeral 24 denotes an image display memory. Reference numeral 26 denotes a D / A converter. Reference numeral 28 denotes an image display unit composed of a TFT LCD. Display image data written in the image display memory 24 is displayed by the image display unit 28 via the D / A converter 26.

  Reference numeral 30 denotes a first memory for storing photographed image data, which has a storage capacity sufficient to store a predetermined number of still image data. The first memory 30 can also be used as a work area for the system controller 50.

  A compression / decompression circuit 32 compresses and decompresses image data. The image data stored in the first memory 30 is read and subjected to compression processing or decompression processing. The processed image data is stored in the first memory 30. Write.

  A shutter control unit 40 controls the focal plane shutter 9. A mirror control unit 41 includes a motor and a drive circuit for moving the main mirror 1 up and down. A system controller 50 controls the entire camera body 100. A second memory 52 stores constants, variables, programs, and the like for operating the system controller 50. An optical filter 44 is composed of a quartz birefringence plate, a phase plate, and an infrared cut filter. Reference numeral 120 denotes a built-in strobe (built-in flash device) that is built into the camera body 100 and emits a flash on the subject. In the built-in strobe 120, 121 is an Xe tube, 122 is a reflective shade, 123 is a light emission control circuit composed of an IGBT or the like that controls light emission of the Xe tube 121, and 124 generates a voltage of about 300 V for supplying power to the Xe tube 121. It is a charging circuit.

  Reference numeral 54 denotes an in-finder display unit composed of a liquid crystal display device that displays a camera operation state, a message, and the like in accordance with execution of a program in the system controller 50. The display contents of the display unit 54 in the viewfinder include in-focus display, AE lock / FE lock display, flash charge display, red-eye reduction setting display, shutter speed display, aperture value display, exposure level / exposure correction display, and the number of continuously shootable images. There are indications. Reference numeral 56 denotes an electrically erasable / recordable nonvolatile memory such as an EEPROM.

  Hereinafter, the operation means of the camera in this embodiment will be described. The operation means inputs various operation instructions to the system controller 50, and includes a switch, a dial, a lever, and the like.

  Reference numeral 1203 denotes a mode dial, which can be set to switch shooting modes. Reference numeral 63 denotes a first shutter switch SW1, which is turned on by half-pressing the shutter button 1206 (FIG. 1-2), and instructs to start operations such as AF (autofocus) processing and AE (automatic exposure) processing. Further, when the SW1 is turned on, a photometric timer for a predetermined time is started. During this photometric timer, the shutter speed, aperture value, and exposure level display calculated from the photometric results are displayed on the in-finder display unit 54 and the image display unit 28. The The photometry timer is updated by continuing to turn on the first shutter switch SW1 or by operating operation members such as the main electronic dial 1205 and the AE lock button 1304.

  Reference numeral 64 denotes a second shutter switch SW2, which is turned on when the shutter button 1206 (FIG. 1-2) is fully pressed, and instructs the start of a series of photographing processing operations. A power switch 1204 turns on / off the camera. Reference numeral 1205 denotes a main electronic dial used for selection and setting related to photographing. By rotating the click by one click, a 2-bit signal with a phase shift is sent to the system controller 50, whereby the rotation direction and the number of clicks are detected. .

  Reference numeral 101 denotes an operation unit including various buttons. Specifically, the DISP button 1302, the MENU button 11301, the play button 1309, the delete button 1310, the live view button 1308, and the ranging point selection button 1305 shown in FIG. AE lock button 1304 and exposure correction setting button 1307.

  Reference numeral 80 denotes a power supply control unit, which includes a battery detection circuit, a DC-DC converter, a switch circuit that switches blocks to be energized, and the like. The power supply control unit 80 detects the presence / absence of the power supply unit 86, the type of battery, and the remaining battery level, controls the internal DC-DC converter based on the detection result and the instruction from the system controller 50, and supplies power to each unit. Supply.

  82 is a power supply terminal on the body side, 84 is a power supply terminal on the power supply side, 86 is a primary battery such as an alkaline battery or lithium battery, a secondary battery such as a NiCd battery, NiMH battery, or Li battery, or an AC adapter. It is a power supply unit.

  Reference numeral 90 denotes an interface (I / F) with a recording medium 200 such as a memory card or a hard disk. A body side recording medium connector 92 is connected to the recording medium 200 such as a memory card or a hard disk. The interface 90 and the body-side recording medium connector 92 are configured using an SD card, a CF (Compact Flash (registered trademark)) card, or the like conforming to a standard.

  A communication unit 110 has a communication function of USB or IEEE1394. Reference numeral 112 denotes a connector for connecting the camera body 100 to other devices through the communication unit 110. Reference numeral 200 denotes a recording medium such as a memory card or a hard disk. The recording medium 200 includes a recording unit 202 composed of a semiconductor memory, a magnetic disk, or the like, an interface (I / F) 204 with the camera body 100, and a connector 206 for connecting with the camera body 100.

  Reference numeral 1104 denotes a communication line (mount contact) for performing communication between a photographing lens unit 300 (to be described later) and a system controller 50 on the camera body 100 side. A communication line for performing communication.

  Next, the photographing lens unit 300 will be described. Reference numeral 301 denotes a photographic lens for allowing an optical image of the subject to pass through and forming an image on the image sensor 14. A focus control unit 302 includes a motor and a motor driving circuit for driving the photographing lens 301 in the optical axis direction and focusing. Note that the focus control unit 302 has a configuration as an application example of the focus adjustment unit of the present invention.

  Reference numeral 303 denotes a subject distance detection unit including an encoder for detecting the distance from the position information of the photographing lens 301 to the subject. Reference numeral 304 denotes an aperture for adjusting the amount of exposure to the image sensor 14 at the time of shooting in combination with the shutter 9, and reference numeral 305 denotes an aperture control unit including a motor for driving the aperture 304 and a motor drive circuit. A lens control microcomputer 306 controls the focus control unit 302, the aperture control unit 305, and the like, and controls communication with the system controller 50 on the camera body 100 side.

  The taking lens unit 300 is detachably attached to the camera body 100 via a lens mount 1105. Further, it is electrically connected to the camera body 100 through a mount contact 1104 composed of a serial communication line and a power supply unit.

  Next, an external strobe (external flash device) 400 that is externally attached to the camera body 100 and emits flash on the subject will be described.

  401 is an Xe tube. Reference numeral 402 denotes a reflective shade. Reference numeral 403 denotes a light emission control circuit composed of an IGBT or the like that controls the light emission of the Xe tube 401. Reference numeral 404 denotes a charging circuit that generates a voltage of about 300 V for supplying power to the Xe tube 401. Reference numeral 405 denotes a power supply unit such as a battery for supplying power to the charging circuit 404, and reference numeral 406 denotes a strobe control microcomputer that controls light emission and charging of the external strobe 400 and controls communication with the system controller 50 on the camera body 100 side. is there.

  The external strobe 400 is detachably attached to the camera body 100 via an accessory shoe 1202. Further, it is electrically connected to the camera body 100 through a flash contact 1201 composed of a serial communication line and an X terminal (light emitting terminal). Reference numeral 131 denotes a shake detection unit that measures vibrations such as a gyro sensor, an angular velocity sensor, and an acceleration sensor, converts them into electrical signals, and outputs them to the system controller 50.

  FIG. 3 is a flowchart showing a live view display operation in the present embodiment. Hereinafter, the live view display operation in the present embodiment will be described with reference to FIG. When the live view button 71 is pressed while the camera is turned on and in the viewfinder observation state, the processing of this sequence is started.

  In S301, the system controller 50 performs mirror-up control, retracts the main mirror 1 and the sub mirror 3 to the outside of the photographing optical path, and opens the focal plane shutter 9. In S <b> 302, the system controller 50 performs live view display on the image display unit 28.

  FIG. 4 is a diagram showing a display example of the image display unit 28 during live view display, and shows a state where the AF distance measurement point is aligned with the right eye of the subject person. The live view image 401 is obtained by continuously displaying data obtained from the image pickup device 14 and image-processed at about 30 frames per second. The selected distance measuring frame 402 is displayed on the live view image 401 in an easily distinguishable color such as yellow, so that the position of the selected distance measuring point can be determined. Note that the distance measurement frame is a frame indicating a focus position obtained by the focus adjustment function of the focus control unit 302.

  In S303, the system controller 50 determines whether SW1 is turned on. If SW1 is ON, the process proceeds to S304. If SW1 is not ON, the process proceeds to S314. In S304, the system controller 50 performs AE (automatic exposure) processing based on the camera settings, and calculates the shutter speed, aperture value, ISO sensitivity, and the like. In S305, the system controller 50 starts a photometric timer. If the photometry timer is already active, the photometry timer is updated.

  In S316, the system controller 50 determines whether AF is set to be valid. If the AF mode is set to ON, the process proceeds to S306. If the AF mode is not set to ON, the process proceeds to S308. In step S306, the system controller 50 starts a subroutine for a series of processing for LV phase difference AF. Details of the process of S306 will be described later.

  In step S307, the system controller 50 determines whether or not focusing on the subject has been successful in the processing in step S306. If successful, the process proceeds to S317, and if unsuccessful, the process proceeds to S312. In step S317, the system controller 50 displays on the image display unit 28 that AF has succeeded. Specifically, the display of the distance measurement frame 402 is displayed in green or the like.

  In S308, the system controller 50 determines whether SW1 is turned on. If SW1 is ON, the process proceeds to S309. If SW1 is not ON, the process proceeds to S314. In S309, the system controller 50 updates the photometry timer. In S310, the system controller 50 determines whether SW2 is turned on. If SW2 is ON, the process proceeds to S311. If SW2 is not ON, the process returns to S308. In step S311, the system controller 50 performs a series of shooting processes.

  In S312, the system controller 50 determines whether SW1 is turned on. If SW1 is ON, the process proceeds to S313. If SW1 is not ON, the process proceeds to S314. In step S313, the system controller 50 displays on the image display unit 28 that AF has failed. Specifically, a display such as blinking the display of the distance measurement frame 402 in red is performed.

  In S314, the system controller 50 determines whether or not to end the live view display. Specifically, when the live view button 1308 is pressed, the power switch 1204 is turned off, or the photographing lens unit 300 is removed, it is determined that the live view ends. When the process ends, the process proceeds to S315, and when the process does not end, the process returns to S602. In S315, the system controller 50 ends the live view display. In S318, the system controller 50 controls the mirror down, returns the main mirror 1 and the sub mirror 3 to the positions where they are obliquely arranged in the photographing optical path, closes the focal plane type shutter 9, and ends the series of processing.

  FIG. 5 is a flowchart showing the processing of the subroutine of S306 in FIG. When this subroutine is called, first, the system controller 50 creates still image data from the image data of the latest frame and writes it in the first memory 30 in S501. This still image data is not created using image data for live view display, but may be created by taking a separate image for creating still image data. Note that S501 is a processing example of the generation unit of the present invention.

  In step S502, the system controller 50 processes the still image data to create still image data for display, and superimposes a distance measurement frame and the like. The display in this state is the same as the display described with reference to FIG. 4 when the live view image 401 is stopped immediately before this subroutine is called. In step S511, the system controller 50 starts display position correction processing. Details of the display position correction processing will be described later. Note that S502 is a processing example of the display control means of the present invention.

  In step S <b> 503, the system controller 50 performs mirror down control, returns the main mirror 1 and the sub mirror 3 to the positions where they are obliquely installed in the photographing optical path, and closes the focal plane shutter 9. In step S <b> 504, the system controller 50 starts AF calculation for calculating the driving amount of the photographing lens 301 based on the signal from the focus detection unit 8.

  In step S507, the system controller 50 determines whether the AF calculation is successful. If the AF calculation is successful and the lens drive amount can be calculated, the process proceeds to S508. If the AF calculation is not successful and the lens drive amount cannot be calculated, the process proceeds to S512. In step S508, the system controller 50 controls driving of the photographing lens 301 based on the AF calculation result in step S504.

  In S512, the system controller 50 controls mirror up. The content of the process is the same as S301. In step S513, the system controller 50 performs live view display on the image display unit 28, and ends this subroutine.

  The details of the display position correction processing in S511 of FIG. 5 will be described below. FIG. 6 is a flowchart showing the operation of the display position correction process in the first embodiment of the present invention.

  When instructed to start the display position correction process, the system controller 50 calculates the camera shake amount (including the vibration amount) from the output of the shake detection unit 131 in step S601. The blur amount is obtained as a rotation angle in the vertical and horizontal directions of the camera from the time when the still image data displayed in S502 is captured. In S602, the system controller 50 calculates the shift amount of the display image, and shift-displays the still image data displayed in S502. Specifically, the system controller 50 determines the subject position actually detected by the focus detection unit 8 from the blur amount obtained in S601 and the focal length and shooting distance information of the mounted shooting lens unit 300. Ask. Then, the system controller 50 shifts the still image data so that the position where the still image data and the distance measurement frame overlap is the same as the subject position detected by the focus detection unit 8. Note that S601 is a processing example of the detection means of the present invention.

  FIG. 7 is a diagram showing a display example in which still image data is shifted by the display position correction processing shown in FIG. In FIG. 7, the distance measurement position adjusted to the right eye of the subject at the start of the phase difference AF represents a state where the camera is shaken in the lower left direction and the distance measurement position faces the background. The still image data 703 is shifted (moved) in the upper right direction so that the position actually detected by the focus detection unit 8 and the position where the still image data 703 and the distance measurement frame 702 overlap are the same.

  In step S603, the system controller 50 determines whether to end the process. When the phase difference AF process is continued and still image data display is continued, the process returns to S601 to continue the process, and when the still image data display is terminated, this process is terminated.

  As described above, according to the present embodiment, during execution of phase difference AF during live view display, still image data immediately before being mirrored down by the phase difference AF operation on the image display unit 28 and the selected distance measurement frame Is displayed. Furthermore, the still image data is shifted and displayed corresponding to camera shake. For this reason, even when the live view image cannot be confirmed during phase difference AF, it is possible to confirm the target position of the subject that is currently AF, and to prevent problems such as focusing on an unintended location due to blurring. In addition, since a portion that is out of the shooting range due to the blur is also out of the display range on the display of the image display unit 28, a subject that is out of the shooting range can be confirmed.

  Next, a second embodiment of the present invention will be described. FIG. 8 is a flowchart showing the operation of the display position correction process in the second embodiment of the present invention. Hereinafter, the display position correction processing in this embodiment will be described with reference to FIG.

  When an instruction to start the display position correction process is given, the system controller 50 calculates the camera shake amount (including the vibration amount) from the output of the shake detection unit 131 in step S801. The blur amount is obtained as a rotation angle in the vertical and horizontal directions of the camera from the time when the still image data displayed in S502 is captured.

  In step S802, the system controller 50 calculates the shift amount of the display image and shift-displays the distance measurement frame displayed in step S502. Specifically, the system controller 50 detects the subject position actually detected by the focus detection unit 8 from the blur amount obtained in S801 and the focal length and shooting distance information of the mounted shooting lens unit 300. Ask for. Then, the system controller 50 shifts the distance measurement frame so that the position where the still image data and the distance measurement frame overlap is the same as the subject position detected by the focus detection unit 8.

  FIG. 9 is a diagram showing a display example in which the distance measurement frame is shifted by the display position correction processing shown in FIG. In FIG. 9, the distance measurement position adjusted to the right eye of the subject at the start of the phase difference AF represents a state in which the camera is shaken in the lower left direction and the distance measurement position faces the background. The distance measurement frame 902 is shifted in the lower left direction so that the position actually detected by the focus detection unit 8 is the same as the position where the still image data 903 and the distance measurement frame 902 overlap.

  In step S803, the system controller 50 determines whether to end the process. When the phase difference AF process is continued and still image data display is continued, the process returns to S801 to continue the process, and when the still image data display is terminated, this process is terminated. Other processes in the present embodiment are the same as those in the first embodiment.

  As described above, according to the present embodiment, during execution of phase difference AF during live view display, the still image data immediately before being mirrored down by the phase difference AF operation and the selected distance measurement frame are displayed on the liquid crystal monitor. The Further, the distance measurement frame is shifted and displayed corresponding to camera shake. For this reason, even when the live view image cannot be confirmed while phase difference AF is being performed, the target position of the subject currently being AF can be confirmed, and problems such as focusing on an unintended location due to blurring can be prevented. In addition, since still image data is not shifted, an image is not drawn on the display screen, and a margin of the image does not appear, so that display quality is not lowered.

  Next, a third embodiment of the present invention will be described. FIG. 10 is a flowchart showing the operation of the display position correction process in the third embodiment of the present invention. Hereinafter, display position correction processing according to the present embodiment will be described with reference to FIG.

  When instructed to start the display position correction process, the system controller 50 calculates the camera shake amount (including the vibration amount) from the output of the shake detection unit 131 in step S1001. The blur amount is obtained as a rotation angle in the vertical and horizontal directions of the camera from the time when the still image data displayed in S502 is captured.

  In step S1004, the system controller 50 performs mechanical blur correction. Specifically, the system controller 50 obtains a correction amount from the blur amount obtained in S1001 and the focal length and photographing distance information of the mounted photographing lens unit 300, and the blur correction control unit 132 uses the image sensor 14 to obtain a correction amount. Is displaced. When the shake amount exceeds the amount (correction range) that can be corrected by the shake correction control unit 132, the system controller 50 controls the shake correction control unit 132 to correct only the correctable amount. In this embodiment, a method of displacing the image sensor 14 is used as the mechanical blur correction unit, but a method of correcting blur by displacing a part of the optical system parts of the photographic lens unit 300 can also be used. .

  In step S1005, the system controller 50 compares the blur amount obtained in step S1001 with the blur correction amount mechanically corrected in step S1004, and determines whether there is a remaining correction. If there is a remaining correction, the process proceeds to S1006. If there is no remaining correction, the process proceeds to S1003. In step S1006, the system controller 50 calculates the difference between the shake amount obtained in step S1001 and the shake correction amount mechanically corrected in step S1004.

  In S1002, the system controller 50 calculates the shift amount of the still image data, and shifts and displays the still image data displayed in S502. Specifically, in the system controller 50, the focus detection unit 8 actually detects the blur correction amount difference obtained in S <b> 1006 and the focal length and shooting distance information of the mounted shooting lens unit 300. Find the subject position. Then, the system controller 50 shifts the still image data so that the position where the still image data and the distance measurement frame overlap is the same as the subject position detected by the focus detection unit 8.

  In step S1003, the system controller 50 determines whether to end the process. When the phase difference AF process is continued and still image data display is continued, the process returns to S1001 to continue the process, and when the still image data display is terminated, this process is terminated. Other processes in the present embodiment are the same as those in the first embodiment.

  As described above, according to the present embodiment, even if some blurring occurs after the start of phase difference AF, mechanical shake correction is performed to perform distance measurement on the current AF subject position and still image data. The position where the frame is displayed can be prevented from shifting. Further, when the amount of blur increases and exceeds the amount of blur that can be mechanically corrected, the still image data is shifted and displayed corresponding to the blur of the camera. Therefore, the display change during phase difference AF execution is suppressed as much as possible to improve visibility, and even when the live view image cannot be confirmed, the target position of the subject currently being AF can be confirmed, which is not intended due to blurring. Problems such as focusing on the place can be prevented.

  Next, a fourth embodiment of the present invention will be described. FIG. 11 is a flowchart showing the operation of display position correction processing in the fourth embodiment of the present invention. The difference from the display position correction processing in the third embodiment is that, in the third embodiment, the shift amount of the still image data is calculated in S1002, and the displayed still image data is shifted and displayed. In the fourth embodiment, the shift amount of the distance measurement frame is calculated in S1102, and the displayed distance measurement frame is shifted and displayed. The other processes are the same as the processes shown in FIG. Further, other processes in this embodiment are the same as those in the first embodiment.

  As described above, according to the present embodiment, even if some blurring occurs after the start of phase difference AF, mechanical shake correction is performed to perform distance measurement on the currently AF subject position and still image data. The position where the frame is displayed can be prevented from shifting. Further, when the amount of blur increases and exceeds the amount of blur that can be mechanically corrected, the distance measurement frame is shifted and displayed corresponding to the camera shake. Therefore, the display change during phase difference AF execution is suppressed as much as possible to improve visibility, and even when the live view image cannot be confirmed, the target position of the subject currently being AF can be confirmed, which is not intended due to blurring. Problems such as focusing on the place can be prevented. In addition, since still image data is not shifted, an image is not drawn on the display screen, and a margin of the image does not appear, so that display quality is not lowered.

  Note that the system controller 50 may be controlled by a single piece of hardware, or the entire apparatus may be controlled by a plurality of pieces of hardware sharing the processing.

  Although the present invention has been described in detail based on the preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms without departing from the gist of the present invention are also included in the present invention. included. Furthermore, each embodiment mentioned above shows only one embodiment of this invention, and it is also possible to combine each embodiment suitably.

  In the above-described embodiment, the case where the present invention is applied to a camera has been described as an example. However, this is not limited to this example. That is, the present invention can also be applied to a display control device such as a personal computer that can display an image output from a camera in real time.

  The present invention is also realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, etc.) of the system or apparatus reads the program code. It is a process to be executed. In this case, the program and a computer-readable recording medium recording the program constitute the present invention.

  1: Main mirror, 3: Sub mirror, 8: Focus detection unit, 50: System controller, 131: Blur detection unit, 132: Blur correction control unit, 300: Shooting lens unit

Claims (9)

Imaging means;
Focus adjusting means for adjusting the focus;
Generating means for generating still image data based on image data imaged by the imaging means;
An image pickup apparatus comprising: a display control unit configured to superimpose information indicating a focus position on the still image data and display the information on a display unit during focus adjustment by the focus adjustment unit. Further comprising detection means for detecting a blur amount of the imaging device during focus adjustment by the focus adjustment means;
The display control means moves at least one of the display position of the still image data and the information indicating the in-focus position according to the amount of blur detected by the detection means. Item 2. The imaging device according to Item 1. A correction means for correcting blur of the imaging device by displacing a part of the parts of the imaging device;
The display control means, when the shake amount detected by the detection means exceeds the shake correction range by the correction means, the difference between the shake amount detected by the detection means and the shake amount corrected by the correction means The image pickup apparatus according to claim 2, wherein the display position of at least one of the still image data and the information indicating the in-focus position is moved in response.   4. The imaging apparatus according to claim 1, wherein the generation unit generates the still image data based on image data immediately before focus adjustment is started by the focus adjustment unit. 5. .   5. The movable mirror according to claim 1, further comprising a movable mirror that is obliquely installed in a photographing optical path and prevents light from entering the imaging unit during focus adjustment by the focus adjustment unit. Imaging device.   The imaging apparatus according to claim 1, wherein the focus adjustment unit performs phase difference AF. A method for controlling an imaging apparatus having imaging means,
A focus adjustment step for performing focus adjustment;
A generation step of generating still image data based on the image data imaged by the imaging means;
A control method for an imaging apparatus, comprising: a display control step of superimposing information indicating a focus position on the still image data and displaying the information on a display unit during focus adjustment in the focus adjustment step. A program for causing a computer to execute a control method of an image pickup apparatus having an image pickup means,
A focus adjustment step for performing focus adjustment;
A generation step of generating still image data based on the image data imaged by the imaging means;
A program for causing a computer to execute a display control step in which information indicating a focus position is superimposed on the still image data and displayed on a display unit during focus adjustment in the focus adjustment step. A computer-readable recording medium recording a program for causing a computer to execute a control method of an imaging apparatus having an imaging means,
A focus adjustment step for performing focus adjustment;
A generation step of generating still image data based on the image data imaged by the imaging means;
A computer-readable record recording a program for causing a computer to execute a display control step of superimposing information indicating a focus position on the still image data and displaying the information on a display unit during focus adjustment by the focus adjustment step Medium.

Images