JP2016151619A - Shake correction device and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shake correction device capable of, when generating a static image from a dynamic image taken with camera work having motion, obtaining a perfectly still static image with no shake which cannot always be achieved when seen in a frame unit, while suppressing generation of a significantly shaken static image, and also capable of reducing a trouble of selecting a static image from continuous multiple frame images of a prolonged period.SOLUTION: An acquisition timing for a static image frame is determined while taking a dynamic image, enabling a shake correction control appropriate for a static image with a static image correction amount as a correction target value, and a high-quality static image with little shake can be extracted when generating a static image from a recorded dynamic image.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shake correction apparatus equipped with a technique for performing shake correction control optimal for capturing moving images and still images.

  In recent years, with the widespread use of imaging devices such as cameras and videos and changes in their usage, there has been an increasing demand for imaging devices that can simultaneously capture a moving image and a still image. However, a moving image shows a time change of a video, and a still image is an instantaneous image cut out.

  Due to such differences in image representation, there are many differences between camera shooting and camera control such as camera shake correction (IS), autofocus (AF), and exposure control (AE) between moving image shooting and still image shooting. .

  For example, with regard to blur correction control, in the case of moving image shooting, continuity between frames, that is, smooth temporal motion, is important even when there is still a blurring video that has not stopped exactly. .

  On the other hand, in the case of still image shooting, it is an image that captures a certain moment in time, and the main subject is required to have no blur.

  As a result, when a still image is generated from a moving image photographed with a moving camera work, camera shake correction performs correction control in consideration of the smoothness of a moving image. For this reason, when viewed in frame units, the image does not always stop exactly and does not always have a blur, and a still image with a large blur may be generated.

  In addition, in cameras mainly for still image shooting, correction control for stopping camera shake correction in units of frames is performed, so that the smoothness is lost as a moving image, and the image is flipped.

  In cameras mainly for still image shooting, a method of switching to blur correction control having a higher correction effect than when shooting a movie has been proposed when a still image acquisition instruction is received during movie shooting (for example, patents). Reference 1).

JP 2013-47766 A

  However, in the prior art described in Patent Document 1, the photographer has to instruct whether to shoot moving images or still images. Therefore, there is a problem that it takes time and effort to switch between a moving image and a still image as a shooting operation.

  Further, when generating a still image from a captured moving image, there is a problem that it takes time and effort to select a still image from a large number of continuous frame images for a long time.

  The present invention has been made in view of the above problems, and by performing blur correction control suitable for capturing a still image of a specific frame during capturing of a moving image, a still image free from blurring from the captured moving image. It is an object of the present invention to provide a shake correction apparatus that can easily generate the image.

In order to achieve the above object, a blur correction apparatus according to claim 1 of the present invention calculates a first blur correction signal based on the blur information output from the blur detection means during moving image shooting. A signal calculating means, a second signal calculating means for calculating a second shake correction signal having a higher image stabilization performance than the first shake correction signal based on the shake information at the time of shooting a still image, and a shake correction. A shake correction selecting unit that selects a signal to be executed from one of the first shake correction signal and the second shake correction signal;
The blur correction selecting means receives a signal for executing the blur correction from the first blur correction signal when the blur information output from the blur detection means satisfies a predetermined condition during the moving image shooting. The configuration is switched to 2 blur correction signals.

  As described above, according to the present invention, during moving image shooting, it is possible to determine the still image frame acquisition timing and perform still image correction optimal for still images using the still image correction amount as a correction target value. By making it possible, when generating a still image from recorded moving images, it is possible to extract a high-quality still image with less blur.

1 is a block diagram illustrating a configuration example of an imaging apparatus according to a first embodiment of the present invention. The block diagram which shows the structural example of the correction amount calculation part 112 which concerns on 1st Embodiment. 5 is a flowchart illustrating correction amount switching processing according to the first embodiment. The graph explaining the determination method of the correction amount switching timing in 1st Embodiment. 5 is a flowchart illustrating an example of operations of correction amount switching and correction amount calculation according to the first embodiment. The block diagram which shows the structural example of the imaging device which concerns on 2nd Embodiment. The block diagram which shows the structural example of the correction amount calculation part 112 which concerns on 2nd Embodiment. 10 is a flowchart illustrating correction amount switching processing according to the second embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a digital video camera as an example of a shake correction apparatus according to an embodiment of the present invention will be described, but the present invention is not limited to an arbitrary imaging apparatus having both a moving image shooting function and a still image shooting function. The present invention can be applied to an optical device attached to such an imaging device.

  In addition, the imaging device referred to here includes a device with a built-in imaging device, such as a mobile phone with a camera, a game machine, or a personal computer.

[First Embodiment]
FIG. 1 is a block diagram illustrating a system configuration of an imaging apparatus having a blur correction function according to the first embodiment.

  In FIG. 1, reference numeral 101 denotes an image pickup optical system that is a lens group including a plurality of lenses. Reference numeral 102 denotes a correction optical system that corrects image shake, and is a shake correction lens group (shift lens) that moves on a plane orthogonal to the optical axis to correct shake.

  Reference numeral 103 denotes an image pickup device that photoelectrically converts an image formed by the image pickup optical system 101. Reference numeral 104 denotes a camera signal processing circuit that converts an image pickup signal photoelectrically converted by the image pickup device 103 into, for example, a standard video signal. It consists of a processing circuit and a digital signal processing circuit.

  The analog signal processing circuit performs a predetermined process on the signal obtained by the image sensor 103 to generate an analog image signal.

  For example, it comprises a CDS (co-related double sampling) circuit, an AGC (Automatic Gain Control) circuit, and the like.

  The digital signal processing circuit converts an analog imaging signal into a digital signal by an A / D converter, and generates a digital video signal subjected to predetermined signal processing such as gamma correction and white balance. Reference numeral 105 denotes a standard output signal terminal obtained from the camera signal processing circuit 104, and outputs an image captured by the above configuration as a standard video signal.

  The standard video signal output from the standard output signal terminal 105 may be connected to an external monitor or the like. It can also be output and displayed on a display device (liquid crystal panel or viewfinder) provided in the imaging device, or converted into a predetermined recording format and recorded on a recording medium (memory card, hard disk, DVD, magnetic tape, etc.) ) Can also record video signals.

  Reference numeral 110 denotes an angular velocity sensor for detecting a shake applied to the imaging apparatus. For example, it is composed of a vibrating gyroscope or the like, and detects an angular velocity of shaking of the imaging apparatus due to hand shaking or the like and outputs an electrical signal.

  The angular velocity sensor 110 has two axial directions such as a horizontal rotation axis (Yaw) and a vertical rotation axis (Pitch) so as to form detection axes orthogonal to each other on one plane orthogonal to the optical axis. An angular velocity sensor is arranged.

  Then, the correction amount is calculated separately for each detected axis, and the correction optical system 102 is controlled in the two axial directions of the horizontal direction and the vertical direction. Since the calculation of the correction amount of the horizontal rotation axis (Yaw) and the vertical rotation axis (Pitch) and the control of the correction optical system can be realized by the same processing for both axes, only one of the axes will be performed thereafter. Shall be explained.

  Reference numeral 111 denotes an A / D converter for taking the output signal of the angular velocity sensor into the microcomputer. Reference numeral 112 denotes a correction amount calculation unit that calculates the correction amount of the correction optical system 102 from the digital signal obtained from the output signal of the angular velocity sensor 110 via the A / D converter 111.

  If the angular velocity sensor 110 is a digital sensor, the A / D converter 111 is unnecessary, and digital data may be acquired by communication with a microcomputer. The correction amount calculation unit 112 will be described in detail later.

  Reference numerals 130 to 134 denote correction control blocks for controlling the correction optical system (shift lens) 102. Reference numeral 133 denotes a shift encoder, which is a sensor for detecting the position of the shift lens 102, such as a hall sensor. The output value of the shift encoder 133 is input to the shake correction control circuit 130 via the A / D converter 134.

  A blur correction control circuit 130 calculates a control amount of the shift lens from the difference between the correction amount (target value) from the correction amount calculation unit 112 and the current position of the shift lens 102 obtained from the shift encoder 133, and outputs a control signal. To do. Here, the control amount is calculated by performing signal processing by the amplifier and the phase compensation filter on the difference data.

  A shift lens drive circuit 131 is a drive circuit that receives a control signal output by PWM or the like from the shake correction control circuit 130 and outputs a drive waveform to the motor 132. Reference numeral 132 denotes a motor, such as a voice coil motor that drives the shift lens 102.

  Next, details of the correction amount calculation unit 112 will be described with reference to FIG. Here, the A / D converter 111 that supplies an input signal to the correction amount calculation unit 112 and the blur correction control circuit 130 that receives an output signal from the correction amount calculation unit 112 are the same as those in FIG. .

  First, a blur signal is acquired from the A / D converter 111. This is a signal obtained by digitally converting the blurring angular velocity signal detected by the angular velocity sensor 110. Reference numeral 120 denotes a high-pass filter (HPF) having a function capable of changing the frequency characteristic thereof, and blocks and outputs a low-frequency component included in the acquired angular velocity signal.

  Reference numeral 121 denotes an integrator, which obtains an angular displacement amount by time-integrating the angular velocity signal output from the HPF 120. The integrator 121 is performed by incomplete integration, and its time constant can be arbitrarily changed.

  A panning control unit 122 determines whether the imaging apparatus is in a panning state according to the angular velocity signal obtained from the A / D converter 111 and the magnitude of the angular displacement obtained from the integrator 121. Then, according to the determination result, the cutoff frequency of the HPF 120 is changed when the angular velocity signal is large, and the time constant of the integrator 121 is changed when the angular displacement amount becomes large.

  Reference numeral 123 denotes a saturation prevention control unit for limiting the control amount generated by the integrator 121 so that the shift lens 102 does not hit the mechanical movable end. As an example of the control, a value obtained by limiting the output from the integrator 121 is output as a final correction target position so that the control amount of the correction optical system does not exceed a predetermined value (hereinafter referred to as a limiter). To do.

  From the HPF 120 to the saturation prevention control unit 123 is a moving image correction amount calculation unit 113, which calculates a correction target value for performing blur correction suitable for moving image shooting.

  An integrator 124 integrates the angular velocity signal obtained from the A / D converter 111 with time without using the HPF to obtain an angular displacement amount. A saturation prevention control unit 125 has the same function as the saturation prevention control unit 123 in the moving image correction amount calculation unit 113 described above.

  From the integrator 124 to the saturation prevention control unit 125 is a still image correction amount calculation unit 114, which calculates a correction target value for performing blur correction suitable for still image shooting.

  The moving image correction amount calculation unit 113 as the first signal calculation unit is different from the still image correction amount calculation unit 114 in that it includes an HPF 120 and a panning control unit 122. Moving image shooting involves camerawork operations such as panning and tilting. If the movement is corrected, the angle of view differs from the intended camerawork for the photographer.

  Furthermore, since the correction optical system 102 approaches the limiter immediately, it becomes difficult for subsequent blur correction to be effective. Therefore, the panning control unit 122 and the HPF 120 are provided so that the movement is not forcibly corrected when panning or tilting is performed, and the correction target value is changed by cutting the low frequency component of the blur signal. It has become.

  On the other hand, in still image shooting, it is an image that captures a moment in a temporal change, and it is desirable that there is no blur at that moment, that is, a period of one frame in which the image is captured. Accordingly, at this time, the correction target value is calculated so as to correct the blur signal including the low frequency component.

  Reference numeral 126 denotes a timing determination unit as a blur correction selection unit, which sets the correction amount switching timing according to the angular velocity signal obtained from the A / D converter 111 and the angular displacement amount obtained from the integrator 121. judge.

  Reference numeral 127 denotes a switch, which is a moving image correction amount as the first shake correction signal obtained from the moving image correction amount calculation unit 113 and a second shake correction signal obtained from the still image correction amount calculation unit 114. Receive still image correction amount.

  Then, switching is performed based on the determination result of the timing determination unit 126, and one of the selected correction amounts is output to the blur correction control circuit 130.

  Next, the operation of the correction amount switching process will be described in detail with reference to FIG. FIG. 3 is a flowchart showing an example of the operation of the correction amount switching process. Note that the processing shown in FIG. 3 is repeatedly executed at an arbitrary predetermined cycle, such as a capturing cycle by A / D conversion of angular velocity data.

  In step S1001, the data of the angular velocity sensor 110 is captured by the A / D converter 111, and the angular velocity data and the angular displacement amount are acquired. In step S1002, it is determined from the angular velocity data acquired in step S1001 and the amount of angular displacement whether or not it is time to perform still image correction.

  As a result, if it is determined that it is the still image correction timing, the process proceeds to step S1003. If it is determined that it is not the still image correction timing, the process proceeds to step S1004.

  In step S1003, the correction amount calculated by the still image correction amount calculation unit 114 as the second signal calculation means is selected, and the correction amount is output from the switch 127 to the blur correction control circuit 130, and the flow advances to step S1005. move on.

  The still image correction amount calculation unit 114 as the second signal calculation unit calculates a second shake correction signal having higher image stabilization performance than the first shake correction signal based on the shake information when a still image is captured. .

  High anti-vibration performance means that the lower limit value of the cutoff frequency of HPF is lowered to obtain an anti-vibration effect up to a low frequency band. In addition, high anti-vibration performance means that the anti-vibration effect is obtained by increasing the gain of the correction amount based on the shake signal.

  In step S1004, the correction amount calculated by the moving image correction amount calculation unit 113 is selected, the correction amount is output from the switch 127 to the blur correction control circuit 130, and the process proceeds to step S1005. In step S1005, the control amount is calculated from the difference between the correction amount (target value) acquired from the switch 127 and the current position.

  In step S1006, the shift lens 102 is driven and controlled in accordance with the control amount calculated in step S1005, and this process ends.

  Next, with reference to FIG. 4, the process of step S1002 in the flowchart of FIG. The waveform shown in FIG. 4 shows an example of the change over time in the amount of angular displacement during handheld shooting.

  A point indicated by a circle on the waveform of FIG. 4 is an inflection point of the angular displacement amount, and is a point where the angular velocity shows a value near zero. The point where the angular velocity is close to 0 is when the swing is reversed, and when the motion due to the shake is momentarily small. In still image shooting, it is desirable that there is no blur for one frame period during which an image is captured. Therefore, at this timing, switching to blur correction control optimal for a still image is performed.

  When the angular velocity is close to 0, the motion of blurring is small, so it can be said that even if blur correction suitable for still image shooting is performed so as not to cause blurring, there is almost no influence on the continuity of moving image shooting.

  That is, when the angular velocity based on the shake information is smaller than a predetermined value, the shake correction selection unit switches the signal for executing the shake correction from the first shake correction signal to the second shake correction signal.

  As a condition for determining the switching timing to the still image correction amount at this time, for example, when the angular velocity is a predetermined value A or less, the angular displacement amount is a predetermined value B or less, and the panning state is not set. That's fine.

  The reason why the angular displacement amount is also equal to or less than the predetermined value B is that there is no large amplitude that causes a panning state and that the optical characteristics are not deteriorated when the correction optical system approaches the limiter. This is to make it a condition for capturing.

  In other words, when the angular displacement amount based on the blur information is within a predetermined range of the reference position of the angular displacement amount, the blur correction selecting unit changes the signal for executing the blur correction from the first blur correction signal to the second blur correction signal. Switch to.

  Also, the points indicated by squares on the waveform of FIG. 4 are points where the amount of angular displacement is near zero. The point where the angular displacement amount is near 0 is when the correction optical system is near the control center. When the correction optical system is in the vicinity of the control center, it is a time when optical blurring and resolution deterioration are unlikely to occur and the optical characteristics are good.

  In still image shooting, since image clarity is required, switching to blur correction control optimal for a still image is performed at this timing. When the angular displacement amount is close to 0, the optical characteristics are good. Therefore, blur correction suitable for still image shooting is performed so that a clear still image can be acquired.

  As a condition for determining the switching timing to the still image correction amount at this time, for example, when the angular displacement amount is equal to or less than the predetermined value b, the angular velocity is equal to or less than the predetermined value a, and the panning state is not set. Good.

  The reason why the angular velocity is also set to a predetermined value a or less is that if a large high-frequency movement is forcibly corrected, continuous smoothness at the time of moving image shooting is lost, so that a large high-frequency blur does not occur. This is to make it a condition for capturing a still image.

In the above timing determination conditions, the predetermined values A and a of angular velocity and the predetermined values B and b of angular displacement amount satisfy the following conditions.
0 ≒ A <a
0 ≒ b <B

  Next, calculation of correction amounts for moving images and still images will be described. As described above, the moving image correction amount calculation unit 113 includes the HPF 120 and the panning control unit 122. On the other hand, the still image correction amount calculation unit 114 is configured to calculate the angular displacement amount by integrating the angular velocity data with the integrator 124 without using the HPF.

  Therefore, as a matter of course, the angular displacement amounts calculated by the moving picture integrator 121 and the still picture integrator 124 are different from each other. At this time, if the switch 127 switches the correction amount from moving image to still image or from still image to moving image suddenly, the correction amount changes greatly, and the shift lens 102 also increases in correction movement. There may be a large change in the angle of view on the image.

  In order to improve this problem, it is necessary to perform an integration operation based on the immediately preceding correction amount when the angular displacement amount is calculated by the integrator 121 or the integrator 124 when the timing determination unit 126 determines the switching timing. There is.

  For example, when switching from a moving image to a still image, the current still image correction amount is calculated using the immediately preceding correction amount calculated for the moving image, and the result is used as a correction amount to the blur correction control circuit 130. Output. Conversely, when switching from still image use to movie use, the current movie correction amount is calculated using the correction amount immediately before calculated for the still image, and the result is used as a correction amount for the shake correction control circuit 130. Output to.

  In other words, when returning to moving image shooting after shooting a still image, the shake correction selecting unit performs shake correction on the first shake correction signal when the first shake correction signal is switched to the second shake correction signal. Take over as a signal.

  Here, if the integrator is a low-pass filter (LPF), the intermediate value of the LPF is calculated from the moving image to the still image, or from the still image to the moving image, depending on the switching timing. Therefore, the continuity of the correction amount that does not cause a step can be maintained.

  In addition, it is necessary to perform correction control on the exposure period during the acquisition of the still image frame using the still image correction amount. Therefore, after still image correction is selected in the switching timing determination, correction control is performed with the correction amount calculated by the still image correction amount calculation unit 114 during the exposure period according to the shutter speed.

  Then, in accordance with the end of the exposure period, the still image correction amount is switched to the moving image correction amount. Note that switching to the moving image correction amount has no effect on the still image frame after a time longer than the exposure period has elapsed.

  That is, when the second shake correction signal is selected, the shake correction selection means continues to select the second shake correction signal as a signal for executing the shake correction for a period longer than the image capture time.

  Based on the above, the correction amount switching for moving image and still image and the calculation of the correction amount by the integrator (LPF) calculation at that time will be described with reference to FIG. FIG. 5 is a flowchart showing an example of correction amount switching and correction amount calculation operations.

  Note that the process shown in FIG. 5 is repeatedly executed at an arbitrary predetermined cycle, such as an acquisition cycle of angular velocity data by A / D conversion.

  In step S2001, it is determined whether or not the still image exposure flag set during exposure of the still image frame is 0. If the flag is 0, the process proceeds to step S2002. If the flag is not 0, the process proceeds to step S2007. move on. In step S2002, it is determined whether it is time to perform still image correction.

  As a result, if it is determined that it is not the still image correction timing, the process proceeds to step S2003, and if it is determined that it is the still image correction timing, the process proceeds to step S2004. In step S2003, the correction amount is calculated by the LPF calculation for moving images.

  On the other hand, in step S2004, the intermediate value of the moving image LPF is transferred to the still image LPF, and the correction amount is calculated by the still image LPF calculation using the intermediate value. In step S2005, a still image exposure flag for determining that the still image frame is being exposed is set to 1.

  In step S2007, it is determined whether or not the exposure of the still image frame is completed. This can be done by calculating the exposure period according to the shutter speed and determining whether the exposure period has elapsed in the current frame.

  If the exposure is not completed, the process proceeds to step S2008. If the exposure is completed, the process proceeds to step S2009. In step S2008, the correction amount is calculated by the still image LPF calculation.

  On the other hand, in step S2009, the intermediate value of the still image LPF is transferred to the moving image LPF, and the correction value is calculated by the moving image LPF calculation using the intermediate value.

  In step S2010, the still image exposure flag is set to 0 in order to determine that the exposure of the still image frame has ended. Finally, in step S2006, the correction amount calculated in step S2003, step S2004, step S2008, or step S2009 is output from the switch 127 to the shake correction control circuit 130, and this process ends.

  When the timing for acquiring a still image frame is determined during moving image shooting as described above, information indicating that still image blur correction has been performed on that frame of the recorded image is recorded in metadata or the like. Just keep it.

  As a result, when a still image is generated from the recorded moving image, it is possible to extract a still image with less blurring if determined from the metadata.

  As described above, in the present invention, the blur correction selecting unit outputs a signal for executing the blur correction when the blur information output from the blur detection unit satisfies a predetermined condition during moving image shooting. The signal is switched to the second image stabilization signal.

  As described above, in the first embodiment of the present invention, at the time of moving image shooting, it is determined from the angular velocity data and the angular displacement amount data whether or not it is the timing for acquiring a still image frame.

  Based on the determination result, when still image is generated from the recorded moving image by performing the optimum blur correction control for the still image with the still image correction amount as the correction target value at the still image frame acquisition timing. It is possible to extract a high-quality still image with little blur.

[Second Embodiment]
Next, a second embodiment will be described. In the first embodiment, the still image frame acquisition timing is determined from the angular velocity data and the angular displacement amount. However, in this embodiment, the horizontal detection unit detects the horizontal state of the image to detect the still image frame. A method for determining the acquisition timing will be described.

  FIG. 6 is a block diagram illustrating a system configuration of an imaging apparatus having a shake correction function according to the second embodiment. The configuration of the imaging apparatus in the present embodiment is basically the same as that in FIG. 1 shown in the first embodiment. Therefore, the same number is attached to the same block, and the description is omitted.

  6 differs from FIG. 1 in the following points. Reference numeral 115 denotes an acceleration sensor serving as a horizontal detection unit, which detects a tilt state with respect to the horizontal posture of the imaging apparatus.

  Reference numeral 116 denotes an A / D converter for taking the output signal of the acceleration sensor 115 into the microcomputer, and delivers the acquired digital signal of the acceleration data to the correction amount calculation unit 112. As described in the first embodiment, if the acceleration sensor 115 is a digital sensor, the A / D converter 116 is unnecessary, and digital data may be acquired by communication with a microcomputer.

  FIG. 7 is a block diagram showing details of the correction amount calculation unit 112 in the present embodiment. Since FIG. 7 also has basically the same configuration as FIG. 2 shown in the first embodiment, the same blocks are denoted by the same reference numerals and description thereof is omitted.

  7 is different from FIG. 2 in the following points. The timing determination unit 126 acquires acceleration data from the A / D converter 116. Then, a correction amount switching timing is determined according to the acquired acceleration data.

  Specifically, if the acceleration data is in a tilt state where it can be determined to be a horizontal posture, it is determined as the still image frame acquisition timing, and the switch 127 is instructed to select a still image correction amount. If the acceleration data exceeds a threshold that can be determined to be a horizontal posture, the inclination is large, and an instruction is given to select a moving image correction amount.

  FIG. 8 is a flowchart showing an example of the operation of the correction amount switching process in the present embodiment. Note that the processing shown in FIG. 8 is also repeatedly executed at an arbitrary predetermined cycle, for example, a capturing cycle by A / D conversion of angular velocity data.

  In step S3001, the data of the acceleration sensor 115 is taken in by the A / D converter 116 and the tilt information is acquired. In step S3002, a horizontal state is detected from the tilt information acquired in step S3001, and it is determined whether or not it is time to perform still image correction.

  As a result, if it is determined that it is the still image correction timing, the process proceeds to step S3003. If it is determined that it is not the still image correction timing, the process proceeds to step S3004. In step S3003, the correction amount calculated by the still image correction amount calculation unit 114 is selected, the correction amount is output from the switch 127 to the blur correction control circuit 130, and the process proceeds to step S3005.

  In step S3004, the correction amount calculated by the moving image correction amount calculation unit 113 is selected, the correction amount is output from the switch 127 to the blur correction control circuit 130, and the process proceeds to step S3005. In step S3005, the control amount is calculated from the difference between the correction amount (target value) acquired from the switch 127 and the current position. In step S3006, the shift lens 102 is driven and controlled in accordance with the control amount calculated in step S3005, and this process ends.

  In the tilt information, the time when the image is near the horizontal is the time when the horizontality of the screen is maintained. In still image shooting, if the level is kept as much as possible, the image becomes easier for the user to see. Therefore, at this timing, the control is switched to the blur correction control optimum for the still image.

  When the inclination is in the vicinity of the horizontal, the horizontality is almost maintained, so blur correction suitable for still image shooting is performed so that a still image that is easy to view can be acquired.

  That is, the blur correction selection unit switches the signal for executing the blur correction from the first blur correction signal to the second blur correction signal when the tilt information is within a predetermined range during moving image shooting.

  As described above, in the second embodiment of the present invention, it is determined whether or not it is the timing for acquiring a still image frame based on the tilt information of the acceleration sensor during moving image shooting.

  Based on the determination result, when still image is generated from the recorded moving image by performing the optimum blur correction control for the still image with the still image correction amount as the correction target value at the still image frame acquisition timing. It is possible to extract a high-quality still image with little blur.

  In this embodiment, the still image frame acquisition timing is determined based on the tilt information. Naturally, the angular velocity and the angular displacement shown in the first embodiment, and the tilt state shown in the present embodiment May be used to determine the still image frame acquisition timing.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined.

  Also, when a software program that realizes the functions of the above-described embodiments is supplied from a recording medium directly to a system or apparatus having a computer that can execute the program using wired / wireless communication, and the program is executed Are also included in the present invention.

  Accordingly, the program code itself supplied and installed in the computer in order to implement the functional processing of the present invention by the computer also realizes the present invention. That is, the computer program itself for realizing the functional processing of the present invention is also included in the present invention.

  In this case, the program may be in any form as long as it has a program function, such as an object code, a program executed by an interpreter, or script data supplied to the OS.

  The recording medium for supplying the program may be, for example, a magnetic recording medium such as a hard disk or a magnetic tape, an optical / magneto-optical storage medium, or a nonvolatile semiconductor memory.

  As a program supply method, a computer program that forms the present invention is stored in a server on a computer network, and a connected client computer downloads and programs the computer program.

113 correction amount calculation unit for moving image 114 correction amount calculation unit for still image 126 timing determination unit 127 switch 130 shake correction control circuit 131 shift lens drive circuit

Claims (9)

First signal calculation means for calculating a first blur correction signal based on the blur information output from the blur detection means during moving image shooting, and the first blur correction based on the blur information during still image shooting. A second signal calculation means for calculating a second shake correction signal having a higher image stabilization performance than the signal, and a signal for executing the shake correction is either the first shake correction signal or the second shake correction signal. A blur correction device having a blur correction selection means to select from one of the following:
The blur correction selecting means receives a signal for executing the blur correction from the first blur correction signal when the blur information output from the blur detection means satisfies a predetermined condition during the moving image shooting. 2. A blur correction device that switches to two blur correction signals.   When the angular velocity based on the blur information is smaller than a predetermined value, the blur correction selection unit switches a signal for executing the blur correction from the first blur correction signal to the second blur correction signal. The blur correction apparatus according to claim 1.   When the angular displacement amount based on the blur information is within a predetermined range of the reference position of the angular displacement amount, the blur correction selection unit sends a signal for executing the blur correction from the first blur correction signal to the second The blur correction apparatus according to claim 1, wherein the blur correction signal is switched to the first blur correction signal. First signal calculation means for calculating a first blur correction signal based on the blur information output from the blur detection means during moving image shooting, and the first blur correction based on the blur information during still image shooting. A second signal calculation means for calculating a second shake correction signal having a higher image stabilization performance than the signal, and a signal for executing the shake correction is either the first shake correction signal or the second shake correction signal. A shake correction apparatus having a shake correction selection means for selecting from one side and a horizontal detection means for acquiring tilt information of the apparatus,
The blur correction selecting means switches the signal for executing the blur correction from the first blur correction signal to the second blur correction signal when the tilt information is within a predetermined range during the moving image shooting. A blur correction device characterized by the above.   The blur correction selection means, when returning to the moving image shooting after shooting the still image, the first blur correction signal when the first blur correction signal is switched to the second blur correction signal. The shake correction apparatus according to claim 1, wherein the shake correction apparatus takes over as a signal for executing the shake correction.   When the second blur correction signal is selected, the blur correction selection means continues to select the second blur correction signal as a signal for executing the blur correction for a period longer than the image capture time. The blur correction device according to any one of claims 1 to 5.   An imaging apparatus comprising: the blur correction apparatus according to claim 1; and an imaging element. A first signal calculation step of calculating a first blur correction signal based on the blur information output from the blur detection means during moving image shooting; and the first blur correction based on the blur information during still image shooting. A second signal calculation step for calculating a second shake correction signal having a higher image stabilization performance than the signal, and a signal for executing the shake correction is either the first shake correction signal or the second shake correction signal. A shake correction selecting step for selecting from one of the methods, and a control method for the shake correction device,
In the blur correction selecting step, when the blur information output from the blur detection unit satisfies a predetermined condition during the moving image shooting, a signal for executing the blur correction is transmitted from the first blur correction signal to the first blur correction signal. 2. A method for controlling a shake correction apparatus, wherein the control is switched to a second shake correction signal. A first signal calculation step of calculating a first blur correction signal based on the blur information output from the blur detection means during moving image shooting; and the first blur correction based on the blur information during still image shooting. A second signal calculation step for calculating a second shake correction signal having a higher image stabilization performance than the signal, and a signal for executing the shake correction is either the first shake correction signal or the second shake correction signal. A method for controlling a shake correction apparatus having a shake correction selection process for selecting from one side and a horizontal detection process for acquiring tilt information of the apparatus,
The blur correction selection step switches the signal for executing the blur correction from the first blur correction signal to the second blur correction signal when the tilt information is within a predetermined range during the moving image shooting. A control method of a shake correction apparatus characterized by the above.

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