JP2008182447A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stop a shake correction when it is necessary to reduce the load of a CPU such as cases that shutter speed is short or continuous shooting is performed. <P>SOLUTION: A subject image formed by a lens optical system 101a is picked-up by an image pickup element 101b, so as to acquire an image, and a shake correction lens 101a-2 is moved in a direction to be crossed with an optical axis. Thus, the image forming position of the subject image is corrected in the image pickup element, so as to perform optical shape correction. A control part 110 determines whether the shutter time in seconds in photographing the image is not less than the prescribed shutter time in seconds or not. When the shutter time in seconds is not less than the prescribed shutter time in seconds, the control part allows a shake correction means to perform the shake correction. When the shutter time in seconds is less than the prescribed shutter time in seconds, the shake correction by the shake correction means is prohibited. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a camera that captures a subject image and acquires an image.

  The following imaging devices are known. When this imaging device detects that a tripod is attached to the imaging device, it is in a state where there is little shake, so it is determined that shake correction is unnecessary and the shake correction function is stopped, thereby reducing the load on the CPU. (For example, Patent Document 1).

JP 2003-189164 A

  However, in the conventional apparatus, when a tripod is attached to the imaging apparatus, the shake correction is determined to be determined as a scene that does not require shake correction, but this state does not necessarily require a reduction in CPU load. Not always.

The camera according to the present invention captures a subject image formed by the photographing optical system with an imaging element to acquire an image, and moves at least one of the blur correction element and the imaging element included in the photographing optical system in a direction intersecting the optical axis. By correcting the image formation position of the subject image on the image sensor, optical blur correction is performed, the shutter time at the time of image acquisition is set, and the set shutter time is greater than or equal to the predetermined shutter time. Judgment is made whether or not there is, and when the shutter speed is equal to or longer than the predetermined shutter time, the blur correction by the blur correction unit is permitted, and when it is less than the predetermined shutter time, the blur correction by the blur correction unit is prohibited. A blur correction control process is executed.
The camera according to the present invention is also a camera in which a photographic optical system including a shake correcting element is detachable, and an image of a subject image formed by the photographic optical system is captured by the imaging element, and the photographic optical system is provided. By moving at least one of the blur correction element and the image sensor in the direction intersecting the optical axis, the image position of the subject image on the image sensor is corrected to perform optical blur correction, and the shutter speed during image acquisition Is set, and it is determined whether or not the set shutter time is equal to or greater than the predetermined shutter time. When the shutter speed is less than the shutter speed, a blur correction control process for prohibiting the blur correction by the blur correction unit is executed.
In the present invention, either single shooting that acquires a single frame image based on a single shooting operation by a user or continuous shooting that acquires multiple frame images based on a single shooting operation by a user. When acquiring an image and acquiring an image by single shooting, it is preferable not to execute the blur correction control process, and when acquiring an image by continuous shooting, it is preferable to execute the blur correction control process.
In addition, when prohibiting blur correction, it is determined whether or not the position of the blur correction element or the imaging element included in the photographing optical system is positioned at the reference position at the time of image capturing, and is not positioned at the reference position. If it is determined that the position of the image blur correction element or the image sensor included in the photographing optical system may be set as a reference position at the time of image photographing.
Further, when the shutter time is set to be less than a predetermined shutter time and the image sensor is set to output by adding signals of a plurality of pixels, blur correction may be prohibited.
Furthermore, if the shake correction can be switched on / off based on an operation by the user, the shake correction control process is executed when the shake correction is set to on, and the shake correction is turned off. If it is set, the blur correction control process may not be executed.
The camera according to the present invention also captures an object image formed by the imaging optical system with an imaging element to acquire an image, and at least one of the blur correction element and the imaging element included in the imaging optical system is crossed with the optical axis. By moving it, the imaging position of the subject image on the image sensor is corrected and optical blur correction is performed. As an image acquisition method, a single frame image is acquired based on a single shooting operation by the user. Set either single shooting or continuous shooting that acquires images of multiple frames based on a single shooting operation by the user, and when single shooting is set, shake correction by the shake correction means is permitted, A blur correction control process for prohibiting blur correction by the blur correction unit when copying is set is performed.
The camera according to the present invention is also a camera in which a photographic optical system including a shake correcting element is detachable, and an image of a subject image formed by the photographic optical system is captured by the imaging element, and the photographic optical system is provided. Used as an image acquisition method by correcting at least one of the shake correction element and the image sensor in the direction intersecting the optical axis to correct the image formation position of the subject image on the image sensor and performing optical shake correction. A single shot that acquires one frame image based on a single shooting operation by a user or a continuous shot that acquires multiple frame images based on a single shooting operation by a user is set. When blur is set, blur correction control processing that permits blur correction by the blur correction unit and prohibits blur correction by the blur correction unit when continuous shooting is set is performed.
In the present invention, when the shutter time at the time of image acquisition is set, the shutter time is set to be less than the predetermined shutter time, and the image sensor is set to output by adding signals of a plurality of pixels For this reason, it is preferable to prohibit blur correction.
In addition, if the shake correction can be switched on / off based on the operation by the user, if the shake correction is set to on, the shake correction control process is executed and the shake correction is set to off. If it is, the blur correction control process may not be executed.

  According to the present invention, blur correction can be stopped when it is necessary to reduce the load on the CPU, such as when the shutter speed is short or during continuous shooting.

-First embodiment-
FIG. 1 is a block diagram illustrating a configuration of an embodiment of a camera according to the first embodiment. The camera 100 includes an exposure control unit 101, a shake correction control unit 102, an angular velocity sensor 103, an A / D converter 104, a memory 105, a digital image processing unit 106, a display device 107, and an image recording element 108. And a setting unit 109 and a control unit 110.

  The exposure control unit 101 includes a lens optical system (imaging optical system) 101a, an image sensor 101b, a signal amplifier 101c, a flash device 101d, and a TG (timing generator) 101e. The lens optical system 101a includes a focus lens 101a-1, a shake correction lens 101a-2, an aperture 101a-3, and a shutter 101a-4.

  In the camera 100, the subject image is formed on the image sensor 101b by the lens optical system 101a. Specifically, light from a subject incident through the focus lens 101a-1 and a shake correction lens 101a-2 serving as a shake correction element, which will be described later, passes through the aperture 101a-3 and the shutter 101a-4 and is on the image pickup device 101b. Tie a statue to. The image sensor 101b captures a subject image based on a release operation by the user and outputs an image signal to the signal amplifier 101c.

  The signal amplifier 101 c amplifies the input image signal and then outputs the image signal to the A / D converter 104. The A / D converter 104 outputs image data obtained by converting the input image signal (analog signal) to a digital signal to the memory 105. Note that the imaging timing of the subject image by the imaging element 101b and the conversion timing of the image signal to the digital signal by the A / D converter 104 are controlled by the TG 101e. The TG 101e determines these timings based on the release operation by the user.

  The image data output to the memory 105 is subjected to various image processing such as gradation correction processing by the digital image processing unit 106 and then output to the memory 105 again. The control unit 110 outputs and displays the image data after the image processing on a display device 107, for example, a rear liquid crystal monitor included in the camera 100, or records the image data after the image processing on an image recording element 108, for example, a memory card. Or

  The camera 100 in the present embodiment has a blur correction function. Specifically, the lens optical system 101a includes a shake correction lens 101a-2 as a shake correction element. By moving the shake correction lens 101a-2 in a direction crossing the optical axis, the image pickup device 101b is moved. Optical blur correction is performed by correcting the imaging position of the subject image. Note that the user can switch the shake correction function on and off by operating the setting unit 109. When the shake correction is turned on, the shake correction control unit 102 corrects the shake by moving the shake correction lens 101a-2 in a direction that cancels the shake amount detected by the angular velocity sensor 103.

  As described above, in the camera 100 having the shake correction function, preparation for shake correction (preparation for shake correction) is required every time an image is captured. Specifically, the blur correction control unit 102 determines whether or not the position of the blur correction lens 101a-2 is positioned at the reference position at the time of image capturing, and determines that it is not positioned at the reference position. The position of the blur correction lens 101a-2 is set as a reference position at the time of image capturing. That is, centering of the blur correction lens 101a-2 is performed. For this reason, when performing blur correction, a time (preparation time for blur correction control) for making this preparation before image capturing is required.

  Therefore, when blur correction is turned on, it takes time to prepare for blur correction control each time an image is taken, and the processing time is reduced. Therefore, in the present embodiment, the control unit 110 needs to prioritize improving the processing speed at the time of shooting rather than performing the blur correction, and further based on the setting of the camera 100 at the time of shooting. If it is determined that the shake correction is unnecessary, the shake correction function is stopped even when the shake correction is turned on to speed up the process.

  Here, single shooting in which the camera 100 acquires a single frame image based on a single shooting operation by the user, and continuous shooting in which a plurality of frame images are acquired based on a single shooting operation by the user. A case where either of them can be selected as an image capturing method will be described. In this case, when continuous shooting is set as the shooting method, the control unit 110 determines that priority should be given to improving the processing speed during shooting rather than performing blur correction. Further, when the shutter time at the time of shooting is less than the predetermined shutter time T, it is difficult to be affected by camera shake, so that it is determined that blur correction is unnecessary.

  The control unit 110 determines less than a predetermined shutter time T used as a threshold as follows. For example, when the size of the image sensor 101b is the same as that of a 35 mm film, it is set to be 1 / focal length (second). When the size of the image sensor 101b is different from that of the 35 mm film, the focal length is converted by the following calculation.

That is, when the diagonal size of the image sensor 101b _l ccd (mm), the actual focal length of the lens optical system 101a _f ccd (mm), the diagonal size of 35mm film was _{l film} is, 35mm film equivalent focal The distance f _film (mm) is calculated by the following equation (1).
f _film = (l _film / l _ccd ) × f _ccd (1)
The diagonal size l _film of the 35 mm _film is l _film = 43.3 (mm), and the image shooting size with the 35 mm film is 36 mm × 24 mm.

For example, when the diagonal size l _ccd of the image sensor 101b is 28.4 mm and the actual focal length f _ccd of the lens optical system 101a is 50 mm, the 35 mm film equivalent focal length f _film is expressed by the following equation (2). It becomes like this.
f _film = (43.3 / 28.4) × 50 = 76.2 mm≈75 mm (2)

  In the camera 100 according to the present embodiment, it is assumed that normal continuous shooting or high-speed continuous shooting can be selected as the type of continuous shooting. Normal continuous shooting refers to a continuous shooting method in which a user repeats shooting while acquiring a plurality of frames while the shutter button is pressed. When normal shooting is set as the continuous shooting method, the shutter speed changes for each frame. On the other hand, with high-speed continuous shooting, the shutter time is fixed so that it is less than the predetermined shutter time T, and while the user presses the shutter button, shooting is repeated to acquire multiple frames at high speed. This is a continuous shooting method.

  When high-speed continuous shooting is set as the continuous shooting method, in order to shorten the shooting interval of each frame, the control unit 110 outputs the TG 101e so that the image sensor 101b adds and outputs signals of a plurality of pixels. Set. When the image sensor 101b performs pixel addition, the apparent ISO sensitivity of the output image signal can be improved. For example, the apparent ISO sensitivity can be quadrupled by adding four pixels in the image acquired by the image sensor 101b and considering it as one pixel.

  Specifically, the apparent ISO sensitivity is equivalent to ISO400 by adding four pixels of an image shot with ISO sensitivity equivalent to ISO100 to one pixel. Further, the apparent ISO sensitivity is equivalent to ISO 1600 by adding four pixels of an image photographed with an ISO sensitivity equivalent to ISO 200 to one pixel. As described above, when the apparent ISO sensitivity is increased by performing pixel addition in the image sensor 101b, noise is reduced and a high-quality image is obtained rather than electrically increasing the ISO sensitivity by the signal amplifier 101c. be able to.

  Also, by performing pixel addition, the number of pixels of the image signal output from the image sensor 101b is reduced, so that the time required for transferring the image signal and the time required for image processing in the digital image processing unit 106 are shortened. And the processing speed can be improved.

  FIG. 2A is a diagram illustrating a specific example of an image signal output from the image sensor 101b in the case of single shooting or normal continuous shooting. 2A illustrates a case where the image sensor 101b captures and acquires image data including color information of any one of RGB color components in each pixel, for example, a Bayer image represented by the RGB color system. The image signal is shown. As shown in FIG. 2A, in the case of single shooting or normal continuous shooting, the image sensor 101b outputs the signal of each pixel to the signal amplifier 101c.

  On the other hand, FIG. 2B is a diagram illustrating a specific example of an output signal when the image sensor 101b adds and outputs four pixels in the case of high-speed continuous shooting. As shown in FIG. 2B, in the case of high-speed continuous shooting, the image sensor 101b adds the R components of the four pixels 2a to 2d in FIG. 2A and outputs the pixel 2e. . Similarly, for the other color component pixels, the four pixels in FIG. 2A are added and output as one pixel.

  The control unit 110 permits the shake correction by the shake correction control unit 102 when the shake correction is on and the image capturing method is single shooting. Further, when the image shooting method is continuous shooting, blur correction is prohibited when the shutter speed at the time of image shooting is less than the predetermined shutter time T, and shake correction is allowed when the shutter speed is T or more. . That is, when the continuous shooting method is normal continuous shooting, the control unit 110 determines whether or not the shutter time at the time of image shooting is equal to or greater than the predetermined shutter time T, and if it is less than T, Only prohibit blur correction. In addition, when the continuous shooting method is high-speed continuous shooting, the shutter speed is always less than T, and thus the blur correction is prohibited without determining the shutter speed.

  FIG. 3 is a diagram schematically showing the flow of processing of each photographing method when blur correction is permitted or prohibited as described above. FIG. 3A shows a case where single shooting is set as the shooting method. In this case, since blur correction is permitted, after the release is turned on, exposure is performed after preparing for blur correction. Thereafter, the acquired image is recorded on the image recording element 108.

  FIG. 3B shows a case where the shutter time is less than T seconds in normal continuous shooting. In this case, since blur correction is prohibited, after the release is turned on, exposure is performed without performing blur correction preparation, and an image is recorded. These processes are repeated while the user is pressing the shutter button. As a result, the exposure interval can be shortened and images of a plurality of frames can be acquired without delay.

  FIG. 3C illustrates a case where the shutter time is T seconds or more in normal continuous shooting. In this case, since blur correction is permitted, after the release is turned on, exposure is performed after preparing for blur correction, and an image is recorded. These processes are repeated while the user is pressing the shutter button. Thereafter, the acquired image is recorded on the image recording element 108.

  FIG. 3D shows the case of high-speed continuous shooting. In this case, since blur correction is prohibited, after the release is turned on, exposure is performed without performing blur correction preparation, and an image is recorded. At this time, the image sensor 101b performs pixel addition and outputs an image signal. These processes are repeated while the user is pressing the shutter button. As a result, the exposure interval can be shortened and images of a plurality of frames can be acquired without delay.

  4 and 5 are flowcharts showing the processing of the camera 100 in the first embodiment. The process shown in FIG. 4 is executed by the control unit 110 as a program that is activated when the power of the camera 100 is turned on.

  In step S10, the control unit 110 determines whether or not the power is turned off by the user. If it is determined that the power has been turned off, the process is terminated. On the other hand, if it is determined that the power is not turned off, the process proceeds to step S20. In step S20, the control unit 110 determines whether or not the shake correction function is turned on by the user. If it is determined that the shake correction function is set to OFF, the process proceeds to step S400 in FIG. On the other hand, if it is determined that the blur correction is set to ON, the process proceeds to step S30.

  In step S30, the control unit 110 turns on the camera shake correction function of the camera 100, and proceeds to step S40. In step S <b> 40, the control unit 110 displays a through image on the display device 107 by outputting images continuously captured by the image sensor 101 b to the display device 107. Thereafter, the process proceeds to step S50, and the control unit 110 determines whether or not the shutter button has been pressed by the user. If it is determined that the shutter button has not been pressed, the process returns to step S10 and the process is repeated. On the other hand, if it is determined that the shutter button has been pressed, the process proceeds to step S60.

  In step S60, the control unit 110 determines whether continuous shooting, that is, normal continuous shooting or high-speed continuous shooting is set as the shooting method. If a negative determination is made, that is, if single shooting is set as the shooting method, the process proceeds to step S70. In step S <b> 70, the control unit 110 determines shooting conditions for an image (still image). For example, the shutter speed and aperture value are determined. Thereafter, the process proceeds to step S80, where the control unit 110 sets the TG 101e for still image shooting, and proceeds to step S90.

  In step S90, the control unit 110 moves the position of the blur correction lens 101a-2 in the lens optical system 101a to the reference position at the time of image capturing, that is, outputs a centering command for performing centering to the blur correction control unit 102. Then, the process proceeds to step S100. In step S100, it is determined whether or not a predetermined time required for centering, that is, a preparation time for shake correction control has elapsed. If a positive determination is made, the process proceeds to step S110. In step S110, the control unit 110 acquires an image captured by the image sensor 101b and captures a still image. Thereafter, the process proceeds to step S120, the digital image processing unit 106 is set to perform image processing on the acquired still image, and the process returns to step S10.

  Next, a process when continuous shooting is set as a photographing method in step S60 will be described. In this case, the process proceeds to step S130, and the control unit 110 determines whether the continuous shooting method is normal continuous shooting or high-speed continuous shooting. If it is determined that the normal continuous shooting is performed, the process proceeds to step S140, and image shooting conditions for shooting a still image are determined in the same manner as in step S70. Thereafter, the process proceeds to step S150, where the control unit 110 sets the TG 101e for still image shooting, and proceeds to step S160.

  In step S160, control unit 110 determines whether or not the shutter time determined in step S140 is less than predetermined shutter time T. If a negative determination is made, the process proceeds to step S180, the shake correction function is set on, and the process proceeds to step S200. On the other hand, if an affirmative determination is made, the process proceeds to step S170, the blur correction function is set to OFF, and the process proceeds to step S190. In step S190, the control unit 110 determines whether or not the position of the blur correction lens 101a-2 is positioned at the reference position at the time of image capturing, that is, at the center of the lens optical system 101. If a positive determination is made, the process proceeds to step S220 described later. On the other hand, if a negative determination is made, the process proceeds to step S200.

  In step S200, the control unit 110 outputs a centering command for centering the blur correction lens 101a-2 to the blur correction control unit 102, and the process proceeds to step S210. In step S210, it is determined whether or not a predetermined time necessary for centering, that is, a preparation time for blur correction control has elapsed. If a positive determination is made, the process proceeds to step S220. In step S220, the control unit 110 acquires an image captured by the image sensor 101b and captures a still image. Thereafter, the process proceeds to step S230, the digital image processing unit 106 is set to perform image processing on the acquired still image, and the process proceeds to step S240.

  In step S240, the control unit 110 determines whether or not the shutter button has been released by the user. If a negative determination is made, the process returns to step S140 to repeat the process. On the other hand, if an affirmative determination is made, the process proceeds to step S250, and the control unit 105 turns on the blur correction function and returns to step S10.

  If it is determined in step S130 that the continuous shooting method is set to high-speed continuous shooting, the process proceeds to step S260. In step S260, as in step S70, control unit 110 sets image processing conditions for capturing a still image, and proceeds to step S270. In step S270, the control unit 110 sets the TG 101e for still image shooting. At this time, the TG 101e is set so that the image sensor 101b performs pixel addition and outputs an image signal as described above. Thereafter, the process proceeds to step S280, where the control unit 110 turns off the blur correction function and proceeds to step S290.

  In step S290, the control unit 110 determines whether or not the position of the blur correction lens 101a-2 is positioned at the center of the lens optical system 101. If a positive determination is made, the process proceeds to step S320 described later. On the other hand, if a negative determination is made, the process proceeds to step S300. In step S300, the control unit 110 outputs a centering command for centering the blur correction lens 101a-2 to the blur correction control unit 102, and the process proceeds to step S310.

  In step S310, it is determined whether a predetermined time required for centering, that is, a preparation time for shake correction control has elapsed. If the determination is affirmative, the process proceeds to step S320, where the control unit 110 acquires an image captured by the image sensor 101b and captures a still image. Thereafter, the process proceeds to step S330, and the digital image processing unit 106 is set to perform image processing on the acquired still image. Note that since the still image captured in step S320 is an image obtained by pixel addition as described above, the setting content of the digital image processing unit 106 is different from the setting content in steps S120 and S230 described above. Thereafter, the process proceeds to step S340.

  In step S340, control unit 110 determines whether or not the shutter button has been released by the user. If a negative determination is made, the process returns to step S320 to repeat the process. On the other hand, if an affirmative determination is made, the process proceeds to step S350, and the control unit 105 turns on the blur correction function and returns to step S10.

  Next, processing when it is determined in step S20 that the blur correction function is set to OFF will be described with reference to FIG. In FIG. 5, steps having the same processing contents as those in FIG. 4 are given the same step numbers, and differences will be mainly described.

  In step S400, control unit 110 turns off the blur correction function and proceeds to step S410. In step S410, it is determined whether or not the position of the blur correction lens 101a-2 is positioned at the center of the lens optical system 101. If a positive determination is made, the process proceeds to step S40. On the other hand, if a negative determination is made, the process proceeds to step S420. In step S420, the control unit 110 outputs a centering command for centering the blur correction lens 101a-2 to the blur correction control unit 102, and the process proceeds to step S430. In step S430, it is determined whether a predetermined time necessary for centering has elapsed. If a positive determination is made, the process proceeds to step S40.

According to the first embodiment described above, the following operational effects can be obtained.
(1) It is determined whether or not the shutter time is equal to or greater than the predetermined shutter time. When the shutter time is equal to or greater than the predetermined shutter time, blur correction is permitted, and when the shutter time is less than the predetermined shutter time, The correction was prohibited. As a result, it is necessary to prioritize improving the processing speed during shooting rather than performing blur correction, and further accurately determine the situation where blur correction is unnecessary based on the settings of the camera 100 during shooting. Thus, the blur correction can be effectively prohibited. In other words, the camera 100 according to the present embodiment can reduce the time lag from the shutter release operation to photographing by prohibiting blur correction. In addition, the camera 100 according to the present embodiment can perform high-speed continuous shooting by prohibiting blur correction.

(2) When prohibiting blur correction, it is determined whether or not the position of the blur correction lens 101a-2 is positioned at the reference position at the time of image capture, and when it is determined that the position is not positioned at the reference position. Did centering. Thereby, the blur correction lens 101a-2 is fixed at the center, and the optical axis of the entire lens optical system can be prevented from being shifted during photographing.

(3) When the shutter speed is set to be less than the predetermined shutter time and the image sensor is set to output by adding signals of a plurality of pixels, that is, in the case of high-speed continuous shooting, blur correction is performed. Banned. As a result, when the exposure time is short and the ISO sensitivity can be improved by pixel addition, blur correction is prohibited in consideration of the fact that blur correction is unnecessary, and high-speed continuous shooting can be realized.

(4) When the shake correction is set to ON, whether to enable or disable the shake correction is determined (to execute the shake correction control process), and when the shake correction is set to OFF, The permission or prohibition of shake correction is not judged (shake correction control process is not executed). As a result, even when the blur correction is set to ON, the processing speed can be improved if it is determined that the blur correction is prohibited.

-Second embodiment-
In the first embodiment described above, it is necessary to prioritize improving the processing speed during shooting rather than performing blur correction, and the blur correction is further performed based on the settings of the camera 100 during shooting. When it is determined that the situation is not necessary, the blur correction is prohibited even when the blur correction is turned on to speed up the processing. That is, when continuous shooting is set as the shooting method and the shutter time at the time of shooting is less than the predetermined time, blur correction is prohibited.

  In contrast, in the second embodiment, a description will be given of a case where blur correction is stopped when priority must be given to improving the processing speed at the time of shooting rather than blur correction. Specifically, when continuous shooting is set as the shooting method, blur correction is prohibited regardless of the shutter speed at the time of shooting. 1 to 3 and FIG. 5 are the same as those in the first embodiment, and thus description thereof is omitted.

  FIG. 6 is a flowchart illustrating processing of the camera 100 according to the second embodiment. The process shown in FIG. 6 is executed by the control unit 110 as a program that starts when the camera 100 is turned on. In FIG. 6, steps having the same processing contents as those in FIG. 4 are given the same step numbers, and differences will be mainly described.

  If it is determined in step S60 that the shooting method is continuous shooting, the process proceeds to step S61. In step S61, the controller 110 turns off the blur correction function and proceeds to step S62. In step S62, it is determined whether or not the position of the vibration reduction lens 101a-2 is positioned at the center of the lens optical system 101. If a positive determination is made, the process proceeds to step S130. On the other hand, if a negative determination is made, the process proceeds to step S63. In step S63, the control unit 110 outputs a centering command for centering the blur correction lens 101a-2 to the blur correction control unit 102, and the process proceeds to step S64. In step S64, it is determined whether or not a predetermined time necessary for centering has elapsed. If a positive determination is made, the process proceeds to step S130.

  According to the second embodiment described above, the following operational effects can be obtained in addition to the operational effects of the first embodiment described above. That is, blur correction is permitted when single shooting is set as the shooting method, and blur correction is prohibited when continuous shooting is set. In this way, it is possible to effectively prohibit blur correction in consideration of the need to prioritize improving the processing speed during shooting over blur correction during continuous shooting.

-Modification-
The camera according to the above-described embodiment can be modified as follows.
(1) In the first and second embodiments described above, when the continuous shooting method is high-speed continuous shooting, since the shutter time is always less than T, the determination of the shutter time is not performed. An example in which blur correction is prohibited has been described. However, the blur correction may be prohibited on the condition that the continuous shooting method is high-speed continuous shooting and the image sensor 101b performs pixel addition.

(2) In the first and second embodiments described above, the case where the camera 100 includes the lens group included in the lens optical system 101a, that is, the case where the camera 100 is integrated with the lens group has been described. . However, the present invention can also be applied to the case where the camera 100 is a camera to which a lens barrel can be attached and detached, for example, a single-lens reflex camera. When the camera 100 is a single-lens reflex camera, the focus lens 101a-1, the shake correction lens 101a-2, the stop 101a-3, the shake correction control unit 102, and the angular velocity sensor 103 are included on the lens barrel side.

(3) In the first and second embodiments described above, the blur correction lens 101a-2 included in the lens optical system 101a is used as a blur correction element, and the blur correction lens 101a-2 is moved in a direction crossing the optical axis. Thus, the example in which the optical blur correction is performed by correcting the imaging position of the subject image on the image sensor 101b has been described. However, optical blur correction may be performed by correcting the imaging position of the subject image by moving the image sensor 101b in a direction crossing the optical axis. Further, by moving both the blur correction lens 101a-2 and the image sensor 101b in the direction intersecting the optical axis, the imaging position of the subject image may be corrected to perform optical blur correction. Note that in order to perform blur correction by moving the image sensor 101b, the blur correction control unit 102 controls the image sensor 101b. In this case as well, the camera 100 may be detachable from the lens barrel.

(4) In the above-described first embodiment, the example in which the blur correction is turned off when the shutter speed is less than T when the shooting method is continuous shooting has been described. However, even when the shooting method is single shooting, the blur correction may be turned off when the shutter speed is less than T.

  Note that the present invention is not limited to the configurations in the above-described embodiments as long as the characteristic functions of the present invention are not impaired.

It is a block diagram which shows the structure of one Embodiment of a camera. It is a figure which shows the specific example of pixel addition. It is the figure which represented typically the time which each process requires for every imaging | photography method. It is a 1st flowchart figure which shows the process of the camera 100 in 1st Embodiment. It is a 2nd flowchart figure which shows the process of the camera 100 in 1st Embodiment. It is a flowchart figure which shows the process of the camera 100 in 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Camera, 101 Exposure control part, 101a Lens optical system, 101a-1 Focus lens, 101a-2 Shake correction lens, 101a-3 Aperture, 101a-4 Shutter, 101b Image sensor, 101c Signal amplifier, 101d Flash device, 101e TG , 102 Shake correction control unit, 103 Angular velocity sensor, 104 A / D converter, 105 Memory, 106 Digital image processing unit, 107 Display device, 108 Image recording element, 109 Setting unit, 110 Control unit

Claims (10)

Image acquisition means for acquiring an image by imaging an object image formed by the imaging optical system with an imaging element;
By moving at least one of the image blur correction element and the image sensor included in the photographing optical system in a direction intersecting the optical axis, the imaging position of the subject image on the image sensor is corrected to perform optical blur correction. Blur correction means to perform,
Setting means for setting a shutter speed at the time of image acquisition by the image acquisition means;
It is determined whether or not the shutter time set by the shutter time setting unit is equal to or greater than a predetermined shutter time, and when it is equal to or greater than the predetermined shutter time, the blur correction by the blur correction unit And a control unit that executes a blur correction control process for prohibiting the blur correction by the blur correction unit when the shutter speed is less than the predetermined shutter time. A camera in which a photographic optical system including a shake correction element is detachable,
An image acquisition means for acquiring an image by imaging an object image formed by the imaging optical system with an imaging device;
By moving at least one of the image blur correction element and the image sensor included in the photographing optical system in a direction intersecting the optical axis, the imaging position of the subject image on the image sensor is corrected to perform optical blur correction. Blur correction means to perform,
Shutter time setting means for setting the shutter time at the time of image acquisition by the image acquisition means;
It is determined whether or not the shutter time set by the shutter time setting unit is equal to or greater than a predetermined shutter time, and when it is equal to or greater than the predetermined shutter time, the blur correction by the blur correction unit And a control unit that executes a blur correction control process for prohibiting the blur correction by the blur correction unit when the shutter speed is less than the predetermined shutter time. The camera according to claim 1 or 2,
The image acquisition means may be any one of single shooting for acquiring a single frame image based on a single shooting operation by a user and continuous shooting for acquiring a plurality of frame images based on a single shooting operation by a user. To get an image,
The control means does not execute the blur correction control process when the image acquisition means acquires an image by the single shooting, and when the image acquisition means acquires an image by the continuous shooting, A camera that performs a shake correction control process. The camera according to claim 1 or 2,
The control means determines whether or not the blur correction element included in the photographing optical system or the position of the imaging element is positioned at a reference position at the time of image shooting when the blur correction is prohibited. When it is determined that the camera is not located at a reference position, the camera is characterized in that the position of the shake correction element provided in the photographing optical system or the image sensor is set as a reference position at the time of image photographing. The camera according to claim 1 or 2,
When the shutter time is set to be less than the predetermined shutter time and the image sensor is set to output by adding a plurality of pixel signals, the control means performs the blur correction. Camera characterized by prohibition. The camera according to claim 1 or 2,
Further comprising switching means for switching on / off the blur correction based on an operation by the user,
The control means executes the blur correction control process when the blur correction is set on, and does not execute the blur correction control process when the blur correction is set off. Features a camera. Image acquisition means for acquiring an image by imaging an object image formed by the imaging optical system with an imaging element;
By moving at least one of the image blur correction element and the image sensor included in the photographing optical system in a direction intersecting the optical axis, the imaging position of the subject image on the image sensor is corrected to perform optical blur correction. Blur correction means to perform,
As an image acquisition method by the image acquisition means, a single shot for acquiring a single frame image based on a single shooting operation by a user, and a plurality of frame images based on a single shooting operation by a user. Shooting method setting means for setting any one of continuous shooting,
When single shooting is set by the shooting method setting unit, blur correction by the blur correction unit is permitted, and when continuous shooting is set by the shooting method setting unit, blur correction by the blur correction unit is prohibited. And a control means for executing a shake correction control process. A camera in which a photographic optical system including a shake correction element is detachable,
An image acquisition means for acquiring an image by imaging an object image formed by the imaging optical system with an imaging device;
By moving at least one of the image blur correction element and the image sensor included in the photographing optical system in a direction intersecting the optical axis, the imaging position of the subject image on the image sensor is corrected to perform optical blur correction. Blur correction means to perform,
As an image acquisition method by the image acquisition means, a single shot for acquiring a single frame image based on a single shooting operation by a user, and a plurality of frame images based on a single shooting operation by a user. Shooting method setting means for setting any one of continuous shooting,
When single shooting is set by the shooting method setting unit, blur correction by the blur correction unit is permitted, and when continuous shooting is set by the shooting method setting unit, blur correction by the blur correction unit is prohibited. And a control means for executing a shake correction control process. The camera according to claim 7 or 8,
Further comprising setting means for setting the shutter speed at the time of image acquisition by the image acquisition means;
When the shutter time is set to be less than a predetermined shutter time by the shutter time setting means, and the image sensor is set to output a signal of a plurality of pixels, the control means Is a camera that prohibits the blur correction. The camera according to claim 7 or 8,
Further comprising switching means for switching on / off the blur correction based on an operation by the user,
The control means executes the blur correction control process when the blur correction is set on, and does not execute the blur correction control process when the blur correction is set off. Features a camera.

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