JP2018005145A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device that notifies photographers of a rolling shutter distortion correction range on an optical finder to thereby make it possible to conduct range-finding at a position intended by the photographer.SOLUTION: An imaging device comprises: a mirror 30 that divides light of a subject image; range-finding means 102 in which one divided image is guided to a finder 2, and other divided image is guided to an image pick-up element 31 having a plurality of shooting pixels and a plurality of phase-difference detection pixels arranged, and which range-finds a distance to a subject thanks to the plurality of phase-difference detection pixels; control means 100 that reads the plurality of shooting pixels and the plurality of phase-difference detection pixels by a rolling shutter method, and calculates a motion vector of the subject in a shot image; and determination means 33 that determines whether to make distortion corrections on the basis of a calculation result. When it is determined to make the distortion correction, the imaging device is configured to determine an amount of distortion correction from the calculation result in the control means 100, and cause a focus detection area to be calculated from the amount of distortion correction to be displayed in a display section on the finder 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an image pickup apparatus, and more particularly to an image pickup apparatus that takes an image using a rolling shutter system.

  2. Description of the Related Art In recent years, there is an image pickup apparatus configured to read out accumulated charges by dividing some or all of pixels of an image pickup image sensor into a plurality of photodiodes in a single-lens reflex camera having an optical viewfinder.

  In Patent Document 1, a pixel is divided into two in the horizontal direction, and an image generated by only the divided left pixel (hereinafter referred to as A image) and an image generated only by the right pixel (hereinafter referred to as B image) are read out independently. Techniques to do are disclosed. By detecting an image shift amount according to the distance to the subject formed by the A image and the B image in an image area targeted for autofocus (hereinafter referred to as AF), distance information to the subject can be calculated. Hereinafter, it is referred to as imaging plane phase difference AF.

  When a CMOS (Complementary Metal Oxide Semiconductor) image sensor is used as an image sensor for imaging, a rolling shutter system is known in which signal reading is sequentially performed from above the imaging area during continuous shooting such as live view display or moving image shooting. Since this rolling shutter method causes a deviation in the readout timing within the imaging region, when a moving subject is photographed, the subject image is distorted and an error occurs in the distance information of the imaging plane phase difference AF.

  Therefore, Patent Document 2 discloses a technique for performing focusing control by correcting the phase difference amount calculated from the correlation calculation of the A image and the B image with the distortion amount by the rolling shutter.

JP2015-108672A JP 2014-139679 A

  However, in the conventional technique disclosed in Patent Document 2, since the distortion correction range by the rolling shutter cannot be confirmed on the optical viewfinder, the photographer cannot determine whether the main subject is located within the distortion correction range. If the main subject is located outside the distortion correction range, there is a possibility that the distance cannot be measured accurately at the position intended by the photographer.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an imaging apparatus that enables distance measurement at a position intended by the photographer by notifying the photographer of the rolling shutter distortion correction range on the optical viewfinder.

In order to achieve the above object, an imaging apparatus according to the present invention includes:
It has a mirror that divides the light of the subject image,
One image divided by the mirror is guided to the viewfinder,
The other image divided by the mirror is guided to an image sensor having a plurality of photographing pixels and a plurality of phase difference detection pixels,
Ranging means for measuring the distance to the subject by the plurality of phase difference detection pixels,
A control unit that reads out the plurality of imaging pixels and the plurality of phase difference detection pixels by a rolling shutter method and calculates a motion vector of a subject in the imaging pixels;
Based on the calculation result in the control means, comprising a determination means for determining whether to perform distortion correction,
When it is determined by the determination means that distortion correction is to be performed, a distortion correction amount is determined from a calculation result in the control means,
A focus detection area calculated from the distortion correction amount is displayed on a display unit on the viewfinder.

  According to the present invention, it is possible to provide an imaging apparatus that enables distance measurement at a position intended by the photographer by notifying the photographer of the rolling shutter distortion correction range on the optical viewfinder.

It is the figure which looked at the digital single-lens reflex camera which is an example of embodiment of this invention from the upper surface side and the photographer side. 1 is a block diagram illustrating a main electrical configuration of a digital single-lens reflex camera that is an example of an embodiment of the present invention. FIG. It is a mode that the photographer observed the to-be-photographed object from the finder with the digital single-lens reflex camera which is an example of embodiment of this invention. In the digital single-lens reflex camera which is an example of embodiment of this invention, it is the figure which showed the to-be-photographed object image observed from the finder and the to-be-photographed image read from the image pick-up element by the rolling shutter system at the same time. It is the flowchart which showed the outline of the flow of the signal processing of the digital single-lens reflex camera which is an example of embodiment of this invention. It is the flowchart which showed the outline of the flow of the signal processing of the digital single-lens reflex camera which is an example of embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Example 1]
A first embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1A is a view of a digital single-lens reflex camera as an example of an embodiment of the present invention as viewed from the upper surface side, and FIG. 1B is a photograph of the digital single-lens reflex camera as an example of an embodiment of the present invention. It is the figure seen from the person side.

  As shown in FIG. 1A, the camera body 1 is provided with a mode selection dial 500, a main dial 503, a release button 510, and the like on the upper surface. The mode selection dial 500 includes a shooting mode setting dial 502 that is operated when changing shooting modes such as a shutter speed priority mode and an aperture priority mode, and a power SW 501 that is used to turn the camera body 1 on and off.

  As shown in FIG. 1B, the camera body 1 is provided with a color liquid crystal monitor unit 504 capable of displaying a photographed image, photographing conditions, and the like on a side surface (hereinafter referred to as a back surface) on the photographer side. Yes. The color liquid crystal monitor unit 504 has a touch panel function that allows the camera body 1 to be operated by tracing the surface with a finger or the like. Above the color liquid crystal monitor unit 504, a viewfinder 2 is provided for the photographer to observe the subject image. The finder 2 corresponds to the finder of the present invention.

  FIG. 2 is a block diagram showing a main electrical configuration of a digital single-lens reflex camera as an example of an embodiment of the present invention.

  A central processing unit (hereinafter, referred to as “MPU”) 100 formed of a microcomputer built in the camera body 1 controls operation of the camera, and executes various processes and instructions for each element. The EEPROM 100a built in the MPU 100 can store timekeeping information of the time measuring circuit 109 described later and other information. Here, the MPU 100 corresponds to the control means of the present invention.

  Connected to the MPU 100 are a mirror drive circuit 101, a focus detection circuit 102, a shutter drive circuit 103, a video signal processing circuit 104, a switch sense circuit 105, and a photometric circuit 106. In addition, a liquid crystal display driving circuit 107, a battery check circuit 108, a time measuring circuit 109, a power supply circuit 110, and a piezoelectric element driving circuit 111 are connected to the MPU 100. These circuits operate under the control of the MPU 100.

  The MPU 100 communicates with the lens control circuit 201 in the photographing lens unit 200a via the mount contact 507. The mount contact 507 also has a function of transmitting a signal to the MPU 100 when the photographing lens unit 200a is connected. Accordingly, the lens control circuit 201 communicates with the MPU 100 and drives the photographing lens 200 and the diaphragm 204 in the photographing lens unit 200a via the AF driving circuit 202 and the diaphragm driving circuit 203. In FIG. 2, only one photographing lens 200 is shown for convenience, but in actuality, it is constituted by a large number of lens groups.

  The AF drive circuit 202 is configured by, for example, a stepping motor or the like, and changes the focus lens position in the photographic lens 200 under the control of the lens control circuit 201 and adjusts the imaging light flux to focus on the imaging element 31. The aperture driving circuit 203 is configured by, for example, an auto iris or the like, and changes the aperture 204 under the control of the lens control circuit 201 to obtain an optical aperture value.

  The main mirror 30 guides the photographic light beam passing through the photographic lens 200 to the penta roof mirror 22 and transmits a part thereof while being held at an angle of 45 ° with respect to the photographic optical axis 50 shown in FIG. To the image sensor 31. Details of the image sensor 31 will be described later. Here, the main mirror 30 corresponds to the mirror of the present invention, and the image sensor 31 corresponds to the image sensor of the present invention.

  The mirror drive circuit 101 is constituted by, for example, a DC motor and a gear train, and drives the main mirror 30 to a position where the subject image can be observed by the finder 2 and a position where the subject image is retracted from the photographing light beam.

  The imaging unit 400 is a unit in which an optical low-pass filter 410, a piezoelectric element 430 that is a piezoelectric member, and an imaging element 31 are mainly unitized. The image sensor 31 photoelectrically converts a subject image, and a CMOS sensor is used in the present embodiment.

  A plurality of pixels (not shown) are arranged on the image sensor 31. Each pixel is divided into left and right parts, and an A image generated only from the divided left pixel and a B image generated only from the right pixel can be read out independently. A signal output from the image sensor 31 is supplied to the focus detection circuit 102. The focus detection circuit 102 performs phase difference type focus detection based on the image shift amount between the A image and the B image, and obtains the defocus amount and the defocus direction in the captured image. Based on this, the focus lens in the taking lens 200 is driven to the in-focus position via the lens control circuit 201 and the AF drive circuit 202. Here, the focus detection circuit 102 corresponds to the distance measuring means of the present invention.

  The distortion correction determination unit 33 determines whether the distortion due to the rolling shutter method is equal to or greater than a threshold value from the defocus amount and the defocus direction calculated by the focus detection circuit 102. Here, the distortion correction determination unit 33 corresponds to the determination unit of the present invention. When the distortion correction determination unit 33 determines that the distortion is greater than or equal to the threshold, the MPU 100 calculates a distortion correction amount for correcting the distortion due to the rolling shutter system. As a calculation method, for example, there is a method described in Japanese Patent Application Laid-Open No. 2014-139679.

  The optical low-pass filter 410 disposed in front of the image sensor 31 is a single birefringent plate made of crystal, and the shape thereof is rectangular. The piezoelectric element 430 is a single-plate piezoelectric element (piezo element), and is configured to vibrate by the piezoelectric element driving circuit 111 in response to an instruction from the MPU 100 and transmit the vibration to the optical low-pass filter 410.

  The penta roof mirror 22 converts and reflects the photographing light beam reflected by the main mirror 30 into an erect image. The photographer can observe the subject image from the viewfinder 2 via the viewfinder optical system. The penta roof mirror 22 also guides a part of the photographing light flux to the photometric sensor 46. The photometric circuit 106 obtains the output of the photometric sensor 46, converts it into a luminance signal for each area on the observation surface, and outputs it to the MPU 100. The MPU 100 calculates an exposure value based on the luminance signal.

  The shutter unit (mechanical focal plane shutter) 32 has a shutter front curtain (not shown) in the travel complete position (position retracted from the shutter opening) when the photographer is observing the subject image with the viewfinder 2. A shutter rear curtain (not shown) is at a pre-travel position (a position retracted from the shutter opening). As a result, a part of the photographic light beam transmitted through the main mirror 30 passes through the shutter opening and is guided to the image sensor 31. At the time of shooting, an operation to electronically reset the pixels of the image sensor 31 is performed, and after a desired shutter time has elapsed, the shutter rear curtain moves from the pre-travel position to the travel complete position (position where the shutter opening is shielded). Complete the shooting by shading running. The shutter unit 32 is controlled by the shutter drive circuit 103 that has received a command from the MPU 100.

  The clamp / CDS (correlated double sampling) circuit 34 performs basic analog processing before A / D conversion, and the clamp level can be changed. The AGC (automatic gain adjusting device) 35 performs basic analog processing before A / D conversion, and can change the AGC basic level. The A / D converter 36 converts the analog output signal of the image sensor 31 into a digital signal.

  The video signal processing circuit 104 performs overall image processing by hardware such as gamma / knee processing, filter processing, and information composition processing for monitor display on the digitized image data. The image data for monitor display from the video signal processing circuit 104 is displayed on the color liquid crystal monitor unit 504 via the color liquid crystal drive circuit 112. The video signal processing circuit 104 can also store image data in the buffer memory 37 through the memory controller 38 in accordance with an instruction from the MPU 100.

  Further, the video signal processing circuit 104 can also perform image data compression processing such as JPEG. When continuous shooting is performed, such as continuous shooting, image data can be temporarily stored in the buffer memory 37, and unprocessed image data can be sequentially read out through the memory controller 38. Thereby, the video signal processing circuit 104 can sequentially perform image processing and compression processing regardless of the speed of the image data input from the A / D converter 36.

  The memory controller 38 has a function of storing the image data input from the external interface 40 in the external memory 39 and outputting the image data stored in the external memory 39 from the external interface 40. As the external memory 39, a flash memory that can be attached to and detached from the camera body 1 is used.

  The switch sense circuit 105 transmits an input signal to the MPU 100 according to the operation state of each switch. Switch SW1 (510a) is turned on by the first stroke (half-pressed) of release button 510. The switch SW2 (510b) is turned on by the second stroke (full press) of the release button 510. When the switch SW2 (510b) is turned on, an instruction to start shooting is transmitted to the MPU 100. Further, the switch sense circuit 105 is also connected with a power switch 501, a shooting mode setting dial 502, and a main dial 503.

  The liquid crystal display driving circuit 107 drives the in-finder display unit 21 in accordance with an instruction from the MPU 100.

  The battery check circuit 108 performs a battery check according to an instruction from the MPU 100 and transmits the detection result to the MPU 100. The power supply 42 supplies power to each element of the camera.

The time measuring circuit 109 measures the time and date from when the power SW 501 is turned off to when it is turned on, and transmits the measurement result to the MPU 100 in accordance with an instruction from the MPU 100.
FIG. 3 is a diagram illustrating a display example in the finder 2 when the photographer observes the subject from the finder 2.

  The in-viewfinder display unit 21 includes a field-in-frame display 24 that is displayed superimposed on a viewfinder field area 23 where the subject image reflected by the penta roof mirror 22 can be observed, and a photographing condition display 25 that displays photographing conditions. Yes. Here, the in-finder display unit 21 corresponds to the display unit of the present invention. In the field frame display 24, a distance measurement selection frame 26 indicating a distance measurement point selected by the photographer is displayed.

  The photographing condition display 25 includes a shutter time display unit 25a indicating the shutter time, an aperture display unit 25b indicating the aperture value, a shift amount display unit 25c indicating the shift amount with respect to the appropriate exposure, an index unit 25d serving as an index of the shift amount, It is comprised by the warning part 25e and the focus display part 25f. The warning unit 25e corresponds to a warning display of the present invention. The warning unit 25e is lit to notify that the distance measurement selection frame 26 is outside the focus detection area 27 ′. Details of the focus detection area 27 'will be described later. Note that. The focus detection area 27 'corresponds to the focus detection area of the present invention. The focus display unit 25e is lit to notify the photographer that the subject is in focus.

  4A is a diagram showing a subject image observed from the viewfinder 2, and FIG. 4B is a diagram showing a subject image read from the image sensor 31 by the rolling shutter method at the same time.

  The photographer can check the subject image reflected by the penta roof mirror 22 in the viewfinder visual field region 23. The image pickup device 31 photoelectrically converts the subject image transmitted through the penta roof mirror 22 in the image pickup region 23 ′. When the photographer observes the subject image from the finder 2, the image pickup device 31 always reads out by the rolling shutter method, so that a rolling shutter distortion t occurs above and below the image pickup region 23 ′. Considering the distortion correction amount t ′ for correcting the rolling shutter distortion t, the focus detectable area 27 indicating the area where the focal point can be detected on the image sensor 31 corresponds to the focus detection area 27 ′ on the finder 2. .

  Here, the focus detectable area 27 corresponds to the focus detectable area of the present invention, and the distortion correction amount t ′ corresponds to the distortion correction amount of the present invention. Due to the distortion correction amount t ′, an invisible region 28 indicating an area where focus detection is possible, which cannot be confirmed on the finder, also occurs. Further, the distance measurement selection frame 26 selected by the photographer on the finder 2 based on the distortion correction amount t ′ corresponds to the position of the distance measurement frame 26 ′ on the image sensor 31, so that it is out of the focus detectable area 27. Become. Here, the distance measurement frame 26 'corresponds to a distance measurement selection point of the present invention.

  In this case, focusing is performed at the approximate distance-measurable point 29 that has moved the distance-measuring frame 26 ′ horizontally into the focus-detectable area 27. The approximate distance measurement possible point 29 corresponds to the approximate distance measurement point of the present invention. Here, although the approximate distance measurement possible point 29 is moved horizontally, it may be the point closest to the distance measurement frame 26 ′ in the focus detectable area 27. The approximate distance measuring point 29 'is a position corresponding to the approximate distance measuring possible point 29 on the finder 2, and corresponds to the approximate focal point of the present invention.

  FIG. 5 is a flowchart showing an outline of a signal processing flow of a digital single lens reflex camera which is an example of the embodiment of the present invention.

  At step 600, the photographer indicates the position of the distance measurement selection frame 26 in advance and observes the subject from the viewfinder 2 (hereinafter referred to as an imaging standby state). The instruction of the distance measurement selection frame 26 is given in advance by touching a position on the color liquid crystal monitor unit 504 with a finger. At this time, the camera body 1 is in a power-on state, and the main mirror 30 is in a position where the subject image can be observed. In the shutter unit 32, the shutter front curtain is at the travel completion position, and the shutter rear curtain is at the travel pre-position. In the in-finder display section 21, the distance measurement selection frame 26 of the in-field frame display 24 is lit.

  The shooting condition display 25 displays shooting conditions set in advance by the photographer. For example, when the mode selection dial 500 is set to the shutter speed priority mode, the shutter time display unit 25a displays the set shutter time, and the shift amount display unit 25c displays the set exposure shift amount. doing.

  First, in step 601, it is determined whether the switch SW1 (510a) is turned on. If the switch SW1 (510a) is turned on, the focus detection circuit 102 calculates the defocus amount and the defocus direction in step 602, and the process proceeds to step 603. If the switch SW1 (510a) is OFF, step 601 is repeated.

  In step 603, the distortion correction determination unit 33 determines whether the rolling shutter distortion t is greater than or equal to a threshold value from the defocus amount and the defocus direction. If the rolling shutter distortion t is greater than or equal to the threshold, the MPU 100 calculates a distortion correction amount t ′ for correcting the rolling shutter distortion t in step 604, and the process proceeds to step 606. The distortion correction amount t ′ corresponds to the distortion correction amount of the present invention. If the rolling shutter distortion t is less than the threshold value, the process proceeds to step 605.

  In step 606, it is determined which position the distance measurement selection frame 26 is instructed by the photographer. If the position of the distance measurement selection frame 26 is instructed, the MPU 100 determines whether or not the distance measurement frame 26 'is in the focus detectable area 27 (step 607). Here, step 607 corresponds to the distance measuring point determination means of the present invention.

  If it is determined in step 607 that the distance measuring frame 26 'is within the focus detectable region 27, the focus lens in the photographing lens 200 is driven to the in-focus position so that the distance measuring frame 26' is in focus. (Step 610). If it is determined in step 607 that the distance measurement frame 26 ′ is outside the focus detectable region 27, the focus detection region 27 ′ is displayed on the field frame display 24 of the finder 2 in step 608, and the process proceeds to step 609. . Here, by displaying the focus detection area 27 ′, it is possible to grasp an area where the photographer looking into the finder 2 can detect the focus.

  In step 609, the approximate distance measuring point 29 'is displayed on the field frame display 24 of the finder 2. Here, by displaying the approximate distance measuring point 29 ', the photographer looking into the finder 2 can grasp the actual focal point. Note that the process may proceed to step 611 without displaying step 609. In step 611, the focus lens in the photographic lens 200 is driven to the in-focus position so that the approximate distance measuring point 29 'is focused.

  If the position of the distance measurement selection frame 26 is not instructed in step 606, for example, the focus in the photographing lens 200 is focused so as to focus at the distance measurement point closest to the camera body 1 in the focus detectable area 27. The lens is driven to the in-focus position (step 612). In the present invention, focusing is performed at a distance measuring point closest to the camera body 1. However, for example, a human face may be determined and focused at the position of the face. Further, it may be possible to select where the photographer gives priority to focusing.

If the rolling shutter distortion t is less than the threshold value in step 603, it is determined in step 605 whether the photographer has instructed the position of the distance measurement selection frame 26. If the position of the distance measurement selection frame 26 is instructed, the focus lens in the photographic lens 200 is driven to the in-focus position so that the distance measurement frame 26 'is in focus (step 613).
If the position of the distance measurement selection frame 26 is not instructed in step 605, the focus lens in the photographing lens 200 is adjusted so that the focus is obtained at the distance measurement point closest to the camera body 1 in the focus detectable area 27. Drive to the in-focus position (step 612). As described above, the priority condition for focusing may be changed.

  When the focus lens is driven to the in-focus position in steps 610 to 613, the focus display portion 25e of the finder 2 is turned on in step 614, and the process proceeds to step 615.

  In step 615, it is determined whether the switch SW2 (510b) is turned on. If the switch SW2 (510b) is turned on, photographing is performed in step 616. At this time, the mirror driving circuit 101 drives the main mirror 30 to a position where it is retracted from the photographing light flux. The MPU 100 performs an operation of electronically resetting the pixels of the image sensor 31. Further, the MPU 100 controls the shutter unit 32, and after a desired shutter time elapses, the shutter rear curtain performs a light-shielded travel in which the shutter rear curtain moves from the pre-travel position to the travel complete position, thereby completing the photographing.

  After imaging in step 616, the process ends and returns to the imaging standby state (step 618). If the switch SW2 (510b) is not turned on in step 615, it is determined in step 617 whether the switch SW1 (510a) is turned on. If the switch SW1 (510a) is ON, step 615 is repeated. If the switch SW1 (510a) is OFF, the process proceeds to step 618 and returns to the shooting standby state.

  As described above, in this embodiment, in an imaging apparatus capable of imaging plane phase difference AF, distance measurement is performed at a position intended by the photographer by notifying the photographer of the rolling shutter distortion correction range on the optical viewfinder. Is possible.

[Example 2]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. The description of FIGS. 1 to 4 is the same as that of the first embodiment, and is omitted here. FIG. 6 is a flowchart showing an outline of a signal processing flow of a digital single-lens reflex camera as an example of an embodiment of the present invention.

  Step 700 is the same as step 600 in FIG. First, in step 701, it is determined whether the switch SW1 (510a) is turned on. If the switch SW1 (510a) is turned on, the focus detection circuit 102 calculates the defocus amount and the defocus direction in step 702, and the process proceeds to step 703. If the switch SW1 (510a) is OFF, step 701 is repeated.

  In step 703, the distortion correction determination unit 33 determines whether the rolling shutter distortion t is equal to or greater than a threshold value from the defocus amount and the defocus direction. If the rolling shutter distortion t is greater than or equal to the threshold, the MPU 100 calculates a distortion correction amount t ′ for correcting the rolling shutter distortion t in step 704, and the process proceeds to step 706. Here, by displaying the focus detection area 27 ′, it is possible to grasp an area where the photographer looking into the finder 2 can detect the focus.

  In step 706, it is determined which position the distance measurement selection frame 26 is instructed by the photographer. If the position of the distance measurement selection frame 26 is instructed, the MPU 100 determines whether or not the distance measurement frame 26 'is in the focus detectable area 27 (step 707). Here, step 707 corresponds to the distance measuring point determination means of the present invention.

  If it is determined in step 707 that the distance measuring frame 26 ′ is within the focus detectable region 27, the focus lens in the photographing lens 200 is driven to the in-focus position so that the distance measuring frame 26 ′ is in focus. (Step 710). If it is determined in step 707 that the distance measuring frame 26 ′ is outside the focus detectable region 27, the warning section 25 e of the photographing condition display 25 is turned on in step 708 and the process proceeds to step 709. Instead of turning on the warning section 25e of the shooting condition display 25, the photographer may be warned by changing the color of the distance measurement selection frame 26 or blinking the distance measurement selection frame 26.

  In step 709, the approximate distance measuring point 29 'is displayed on the field frame display 24 of the finder 2. Here, by displaying the approximate distance measuring point 29 ', the photographer looking into the finder 2 can grasp the actual focal point. Note that the process may proceed to step 711 without displaying step 709. In step 711, the focus lens in the photographing lens 200 is driven to the in-focus position so that the approximate distance measuring point 29 'is focused.

  If the position of the distance measurement selection frame 26 is not instructed in step 706, for example, the focus in the photographing lens 200 is focused at the distance measurement point closest to the camera body 1 in the focus detectable area 27. The lens is driven to the in-focus position (step 712). In the present invention, focusing is performed at a distance measuring point closest to the camera body 1. However, for example, a human face may be determined and focused at the position of the face. Further, it may be possible to select where the photographer gives priority to focusing.

  If the rolling shutter distortion t is less than the threshold value in step 703, it is determined in step 705 whether the photographer has instructed the position of the distance measurement selection frame 26. If the position of the distance measurement selection frame 26 is instructed, the focus lens in the photographic lens 200 is driven to the focus position so that the distance measurement frame 26 'is focused (step 713). If the position of the distance measurement selection frame 26 is not instructed in step 705, the focus lens in the photographing lens 200 is adjusted so as to focus at the distance measurement point closest to the camera body 1 in the focus detectable area 27. Drive to the in-focus position (step 712). As described above, the priority condition for focusing may be changed.

  When the focus lens is driven to the in-focus position in steps 710 to 713, the focus display unit 25e of the finder 2 is turned on in step 714, and the process proceeds to step 715.

  In step 715, it is determined whether the switch SW2 (510b) is turned on. If the switch SW2 (510b) is turned on, shooting is performed in step 716. At this time, the mirror driving circuit 101 drives the main mirror 30 to a position where it is retracted from the photographing light flux. The MPU 100 performs an operation of electronically resetting the pixels of the image sensor 31. Further, the MPU 100 controls the shutter unit 32, and after a desired shutter time elapses, the shutter rear curtain performs a light-shielded travel in which the shutter rear curtain moves from the pre-travel position to the travel complete position, thereby completing the photographing. After imaging in step 716, the process is terminated and the process returns to the imaging standby state (step 718).

  If the switch SW2 (510b) is not turned on in step 715, it is determined in step 717 whether the switch SW1 (510a) is turned on. If the switch SW1 (510a) is ON, step 715 is repeated. If the switch SW1 (510a) is OFF, the process proceeds to step 718 to return to the shooting standby state.

  As described above, in this embodiment, in an imaging apparatus capable of imaging plane phase difference AF, distance measurement is performed at a position intended by the photographer by notifying the photographer of the rolling shutter distortion correction range on the optical viewfinder. Is possible.

  The configuration of the present invention is not limited to that exemplified in the above embodiment, and the material, shape, dimensions, form, number, arrangement location, and the like can be changed as appropriate without departing from the scope of the present invention. It is.

1 camera body, 2 viewfinder, 21 viewfinder display, 25e warning section,
26 'ranging frame, 27 focus detection possible area, 27' focus detection area,
29 Approximate distance measuring point, 29 'Approximate distance measuring point, 30 main mirror, 31 image sensor,
33 distortion correction determination unit, 100 MPU, 102 focus detection circuit, t ′ distortion correction amount

Claims (8)

A mirror (30) for dividing the light of the subject image;
One image divided by the mirror (30) is guided to the viewfinder (2),
The other image divided by the mirror (30) is guided to an image sensor (31) provided with a plurality of imaging pixels and a plurality of phase difference detection pixels,
Ranging means (102) for measuring the distance to the subject by the plurality of phase difference detection pixels,
Control means (100) for reading the plurality of imaging pixels and the plurality of phase difference detection pixels by a rolling shutter method to calculate a motion vector of a subject in the imaging pixels;
A determination unit (33) for determining whether to perform distortion correction based on a calculation result in the control unit (100);
If the determination means (33) determines that distortion correction is to be performed, the distortion correction amount (t ′) is determined from the calculation result in the control means (100),
An imaging apparatus, wherein a focus detection area (27 ') calculated from the distortion correction amount (t') is displayed on a display unit (21) on the finder (2). A mirror (30) for dividing the light of the subject image;
One image divided by the mirror (30) is guided to the viewfinder (2),
The other image divided by the mirror (30) is guided to an image sensor (31) provided with a plurality of imaging pixels and a plurality of phase difference detection pixels,
Ranging means (102) for measuring the distance to the subject by the plurality of phase difference detection pixels,
Control means (100) for reading the plurality of imaging pixels and the plurality of phase difference detection pixels by a rolling shutter method to calculate a motion vector of a subject in the imaging pixels;
A determination unit (33) for determining whether to perform distortion correction based on a calculation result in the control unit (100);
In the imaging device that determines the distortion correction amount (t ′) from the calculation result in the control means (100) when the determination means (33) determines that the distortion correction is to be executed,
A selection means that allows the photographer to select a distance measuring point,
A distance measuring point determining means for determining whether or not the distance measuring selection point (26 ') selected by the selecting means is within the focus detectable region (27) of the image sensor (31);
If it is determined by the distance measuring point determination means that the distance measuring selection point (26 ') is not within the focus detectable region (27), the display unit (21 on the finder (2) (21) ) Displays a warning (25e). If it is determined by the distance measuring point determination means that the distance measuring selection point (26 ') is not within the focus detectable region (27), the display unit (21 on the finder (2) (21) The imaging apparatus according to claim 1 or 2, wherein focusing is performed at an approximate distance measuring point (29). The approximate distance measuring point (29) is located in the focus detectable area (27), and corresponds to a position closest to the distance measuring selection point (26 ') in the horizontal direction. The imaging device according to claim 3. The approximate distance measuring point (29) is located in the focus detectable region (27) and is closest to the distance measuring point (26 '). Imaging device. If it is determined by the distance measuring point determination means that the distance measuring selection point (26 ') is not within the focus detectable region (27), the display unit (21 on the finder (2) (21) The imaging apparatus according to any one of claims 3 to 5, wherein an approximate focal point (29 ') corresponding to the approximate distance measuring point (29) is displayed. When the distance measurement point determination means determines that the distance measurement selection point (26 ') is not within the focus detectable area (27), the distance measurement selection point (26') blinks. The image pickup apparatus according to claim 1, wherein the image pickup apparatus is an image pickup apparatus. When it is determined by the distance measuring point determination means that the distance measuring selection point (26 ') is not within the focus detectable area (27), the color of the distance measuring selection point (26') The imaging device according to claim 1, wherein the imaging device is changed.