JP2009069617A - Imaging apparatus, control program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display an image equivalent to a photographed/recorded image in a display means without causing image shake, on shifting a correcting means from a power-saving state to an energized state. <P>SOLUTION: The imaging apparatus includes: the correcting means for correcting the image shake by shifting an object image relatively to an imaging means; a driving means for driving the correcting means; a position detecting means for detecting the position of the correcting means; an image processing means for processing the image from the imaging means so that the center of the image displayed in the display means in the power-saving state where the correcting means is not active and the center of the image displayed in the display means in the energized state where the correcting means is active may align with each other in accordance with position information from the position detecting means, and then, displaying the processed image in the display means; and control means (S111 to S114) for controlling the driving means to shift the correcting means toward an initial position in the energized state by every unit moving amount in synchronism with an image read-out timing from the imaging means when shifting from the power-saving state to the energized state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an imaging device having an image blur correction function, a control program, and a recording medium.

  When shooting a subject, the imaging device may shake due to the shake of the photographer himself or the vibration when the release switch is pressed, and this may cause the shot image to shake. Has been made. For example, one that suppresses image blur by driving the correction lens in a direction that suppresses image blur in a plane orthogonal to the photographing optical axis is one of them.

  Many image pickup apparatuses having a correction lens detect the shake amount of the image pickup apparatus by a shake sensor that detects the shake provided in the image pickup apparatus, and the correction lens is driven by an actuator such as a linear motor according to the detected shake amount. It is intended to reduce the influence. However, this method energizes the actuator to drive the correction lens. For this reason, power is always required to perform image shake correction even in the shooting standby state, and even when no shake correction is performed, power is similarly used to maintain the correction lens at the center of the imaging optical system. Need. Therefore, the shooting time and the number of shots of the imaging apparatus are reduced.

  In view of this, a technique has been proposed (Patent Document 1) that suppresses power consumption by shutting off the power supply to the correction lens during shooting standby. However, if the energization is interrupted, the correction lens is displaced from the center of the imaging optical system due to the influence of external force such as gravity. For this reason, there has been a problem in that a field angle shift occurs between an image displayed during shooting standby and an image actually shot.

In view of the above points, the image displayed when the energization in the shooting standby state is reduced or cut off matches the image displayed when the energization lens is actually energized and the correction lens is at the center of the imaging optical system. As described above, the image is cut out and processed according to the position information of the correction lens. And the technique to display is proposed (patent document 2).
JP 2001-296575 A JP 2006-080969 A

  However, if a large distance is suddenly moved from a state where the energization at the time of shooting standby is cut off to a state where the correction lens is maintained at a desired position by the energization during shooting, it takes time for the correction lens to move. . Therefore, an image is exposed by the image sensor during the time when the correction lens is moving, and an image with shake is captured even though the image pickup apparatus itself is not shaken. For this reason, even if an image is accurately cut out based on the position information of the correction lens, an image that matches an image in a normal energized state cannot be acquired. In addition, since the image itself is shaken, there is a possibility that accurate information cannot be acquired even if a contrast evaluation value for focus determination or information for exposure control is obtained.

  For example, as shown in FIGS. 9A and 9B, when the release switch is half-pressed (when the switch SW1 is turned on) from the state where the energization at the time of shooting standby is cut off (the state where the energization is OFF). Then, the correction lens is moved to the center position (optical axis center) of the imaging optical system. It is assumed that a shake correction operation is started when the release switch is fully pressed (when the switch SW2 is turned on) and exposure is performed by the image sensor. In this case, the position command value sent to the lens control unit when the switch SW1 is turned on becomes the value of the optical center of the imaging optical system as shown in FIG. At this time, since the actual correction lens moves to the optical center position, two frames are required as shown in FIG. 9B, and the movement to the center position of the imaging optical system is completed in the third frame. Then, in the first two frames, the correction lens is in a moving state during the exposure time, and the image displayed on a display device such as an LCD (liquid crystal) or a monitor during that time is a shaken image.

(Object of invention)
An object of the present invention is to provide an image pickup apparatus and a control program capable of causing an image equivalent to a captured recording image to be displayed on the display means without causing image shake when the correction means is shifted from the power saving state to the energized state. And to provide a recording medium.

  In order to achieve the above object, the present invention includes a display unit that displays an image from an imaging unit, a correction unit that corrects image blur by moving a subject image relative to the imaging unit, A driving unit that drives the correcting unit; a position detecting unit that detects a position of the correcting unit; a center of an image displayed on the display unit in a power saving state in which the correcting unit does not function; and the correcting unit. In accordance with the position information from the position detection means, the image from the imaging means is processed so that the center of the image displayed on the display means coincides with the energized state to function, and the display means Image processing means to be displayed on the screen, and when the power saving state shifts to the energized state, the correction means is moved forward by the driving means in synchronization with the image reading timing from the imaging means. It is an image pickup apparatus and a control means for moving each unit moving distance toward the initial position of the energized state.

  Similarly, in order to achieve the above object, the present invention corrects image shake by displaying an image from the imaging unit on the display unit and moving the subject image relative to the imaging unit by the correcting unit. A center of an image displayed on the display unit in a power saving state in which the correction unit does not function, and a center of an image displayed on the display unit in an energized state in which the correction unit functions. Processing the image from the imaging unit according to the position information from the position detecting unit for detecting the position of the correcting unit so as to match, and displaying the image on the display unit; When shifting to the energized state, the correction unit is moved by an amount of unit movement toward the initial position of the energized state in synchronization with the image reading timing from the imaging unit. It is an control program and a step.

  In order to achieve the above object, the present invention is a recording medium on which the control program of the present invention is recorded.

  According to the present invention, when shifting the correction unit from the power saving state to the energized state, an image pickup apparatus and a control program capable of causing the display unit to display an image equivalent to a captured recording image without causing image blurring. Alternatively, a recording medium can be provided.

  The best mode for carrying out the present invention is as shown in Examples 1 to 3 below.

  FIG. 1 is a diagram illustrating the configuration of the imaging apparatus according to the first embodiment. Reference numeral 100 denotes an imaging device, which includes the following members.

  An imaging optical system 10 includes a magnification lens 11a, a focus adjustment lens 11b, a shutter 12, a correction lens 11c for image blur correction, a diaphragm 13, and the like. An image sensor 21 converts an optical image into an electrical signal, and an A / D converter 22 converts an analog signal from the image sensor 21 into a digital signal. A timing generation circuit 24 supplies a clock signal and a control signal to the image sensor 21, A / D converter 22, and D / A converter 27, and is controlled by the memory control circuit 25 and a system controller 50 described later.

  An image processing circuit 23 performs predetermined pixel interpolation processing and color conversion processing on the data from the A / D converter 22 or the data from the memory control circuit 25. The image processing circuit 23 performs a predetermined calculation process using the captured image data. The calculation result is output to the system controller 50. The system controller 50 performs an AE (automatic exposure) process and an EF (flash pre-emission) process using an exposure control unit 41 described later, and a TTL (through-the-lens) system using a focus control unit 42 described later. AF (autofocus) processing is performed. The image processing circuit 23 further performs predetermined calculation processing using the image data, and performs TTL AWB (auto white balance) processing based on the calculation result.

  A memory control circuit 25 controls the A / D converter 22, the image processing circuit 23, the timing generation circuit 24, the image display memory 26, the D / A converter 27, the compression / decompression circuit 28, and the internal memory 29. The output data of the A / D converter 22 is sent to the image display memory 26 or the internal memory via the image processing circuit 23 and the memory control circuit 25, or the output data of the A / D converter 22 is sent directly to the memory control circuit 25. 29 is written. 26 is an image display memory, and 27 is a D / A converter.

  Reference numeral 7 denotes an image display unit including a TFT, an LCD, etc., which displays display image data written in the image display memory 26 via the D / A converter 27. An electronic viewfinder function can be realized by sequentially displaying image data taken using the image display unit 7.

  A compression / decompression circuit 28 compresses and decompresses image data by adaptive discrete cosine transform (ADCT) or the like, reads an image stored in an internal memory 29 to be described later, performs compression processing or decompression processing, and processes the processed data. Write to the internal memory 29. Reference numeral 29 denotes an internal memory for storing captured still images and moving images, which has a sufficient storage capacity for storing a predetermined number of still images and moving images for a predetermined time. As a result, even in the case of continuous shooting or panoramic shooting in which a plurality of still images are continuously shot, it is possible to write a large amount of images to the internal memory 29 at high speed. The internal memory 29 can also be used as a work area for the system controller 50.

  Reference numeral 30 denotes a shake correction apparatus (excluding the correction lens 11c) that corrects the image shake. The shake sensor 33 detects the shake amount of the imaging apparatus. Then, according to the shake amount, the correction lens 11c is controlled by the shake correction control unit 31 and the position detection sensor 32 that detects the position of the correction lens 11c, and image shake (field angle deviation) due to shake is suppressed.

  An exposure control unit 41 controls the shutter 12 and the diaphragm 13 and has a flash light control function in cooperation with a strobe 8 described later. Reference numeral 42 denotes a focus control unit that controls the focus adjustment lens 11b, 43 denotes a zoom control unit that controls zooming by the magnification lens 11a, and 44 denotes a barrier control unit that controls the operation of the barrier 2 serving as a protective member. A strobe 8 has an AF auxiliary light projecting function and a strobe dimming function.

  Reference numeral 50 denotes a system controller that controls the entire imaging apparatus 100, and reference numeral 45 denotes a memory that stores constants, variables, programs, and the like for operation of the system controller 50. Reference numeral 47 denotes a display unit such as a liquid crystal display and a speaker, which displays an operation state, a message, and the like using characters, images, sounds, and the like according to execution of a program by the system controller 50. The display unit 47 is installed in a single or a plurality of positions near the operation unit of the image pickup apparatus 100 so as to be visually recognized, and is configured by a combination of, for example, an LCD (liquid crystal), an LED (light emitting diode), and a sounding element. In addition, the display unit 47 may have a part of the function installed in the optical viewfinder 6.

  Among the display contents of the display unit 47, what is displayed on the LCD or the like includes single shot / continuous shooting display, self-timer display, compression rate display, recording pixel number display, recording number display, remaining image number display, shutter Includes speed display, aperture value display, and exposure compensation display. Furthermore, flash display, red-eye reduction display, macro shooting display, buzzer setting display, clock battery remaining amount display, battery remaining amount display, error display, information display with multiple digits, display / removal state display of recording medium 60, communication Includes I / F operation display, date / time display, etc. Among the display contents of the display unit 47, what is displayed in the optical viewfinder 6 includes in-focus display, camera shake warning display, flash charge display, shutter speed display, aperture value display, exposure correction display, and the like.

  Reference numeral 46 denotes an electrically erasable / recordable nonvolatile memory such as an EEPROM.

  Reference numerals 3, 4 and 5 are operation members for inputting various operation instructions of the system controller 50, and are configured by a single or a combination of a switch, a dial, a touch panel, a pointing by gaze detection, a voice recognition device, or the like. Is done. Hereinafter, these operation members will be specifically described.

  A release switch 3 is half-pressed (switch SW1 is turned on), and operations such as AF processing, AE processing, AWB processing, and EF processing are started. Further, when fully pressed (ON of the switch SW2), an exposure process in which a signal read from the image sensor 21 is written into the internal memory 29 via the A / D converter 22 and the memory control circuit 25, the image processing circuit 23, The development process using the calculation in the memory control circuit 25 is instructed. Furthermore, the image data is read from the internal memory 29, compressed by the compression / decompression circuit 28, and an instruction to start a series of processing operations such as recording processing for writing the image data to the recording medium 60 is given.

  Reference numeral 4 denotes a mode dial switch, which can switch and set various function modes such as power-off, automatic shooting mode, shooting mode, panoramic shooting mode, playback mode, multi-screen playback / erase mode, and PC connection mode. An operation unit 5 includes various buttons and a touch panel, and includes a menu button, a set button, a macro button, a multi-screen playback page break button, a flash setting button, and a single shooting / continuous shooting / self-timer switching button. Furthermore, menu movement + (plus) button, menu movement-(minus) button, playback image movement + (plus) button, playback image movement-(minus) button, shooting image quality selection button, exposure compensation button, date / time setting Including buttons.

  Reference numeral 2 denotes a barrier, which is a protective member that prevents the imaging unit from being soiled or damaged by covering the imaging unit including the imaging optical system 10 of the imaging device 100. Reference numeral 6 denotes an optical viewfinder, which can take an image using only the optical viewfinder without using the electronic viewfinder function of the image display unit 7. In the optical viewfinder 6, some functions of the display unit 47 such as an in-focus display, a camera shake warning display, a flash charge display, a shutter speed display, an aperture value display, an exposure correction display, and the like are installed.

  A power supply control unit 48 includes a battery detection circuit, a DC / DC converter, a switch for switching a circuit to be energized, and the like. Then, the presence / absence of a battery, the type of battery, and the remaining battery level are detected, and the DC / DC converter is controlled based on the detection result and the instruction of the system controller 50, and the necessary voltage is stored for a necessary period. Supply to each part including. Reference numeral 49 denotes a connector.

  Reference numeral 70 denotes a power supply device, which includes a connector 71 connected to the connector 49, a primary battery such as an alkaline battery or a lithium battery, a secondary battery such as a NiCd battery, a NiMH battery, or a Li battery, or a power supply 72 including an AC adapter. Yes.

  Reference numeral 51 denotes an interface (I / F) with a recording medium such as a memory card or hard disk, 52 denotes a connector for connecting to a recording medium such as a memory card or hard disk, and 53 denotes whether or not the recording medium 60 is attached to the connector 52. This is a recording medium attachment / detachment detection unit for detecting the above. The interface and the connector may be configured using a PCMCIA card, SD card, or other standard. A communication control unit 54 has various communication functions such as RS232C, USB, IEEE1394, LAN, and wireless communication. Reference numeral 55 denotes a connector (or an antenna in the case of wireless communication) that connects the imaging apparatus 100 to another device by the communication control unit 54.

  Reference numeral 60 denotes a recording medium such as a memory card or a hard disk, and includes a recording unit 63 composed of a semiconductor memory, a magnetic disk, or the like, an interface (I / F) 62 with the imaging apparatus 100, and a connector 61 for connecting to the imaging apparatus 100. I have.

  Next, the internal configuration of the shake correction control unit 31 will be described with reference to FIG.

  From the signal detected by the shake sensor 33, only necessary signals are extracted by the filter 33a and the amplifier 33b in the shake correction control unit 31, and are converted from analog values to digital values by the A / D converter 33c. It is taken in as a shake amount. Based on the obtained shake amount, a position command value for driving the correction lens 11c is calculated by the calculator 30b. A signal from the position detection sensor 32 that detects the position of the correction lens 11c is amplified by the amplifier 32a and is taken in as a position signal of the correction lens 11c via the A / D converter 32b.

  Using the position signal or the like, feedback control is performed by the lens control unit 30a. Specifically, based on the control amount determined by the lens control unit 30a, the actuator 30d is energized by the drive unit 30c, and the image blur due to the shake is suppressed by driving the correction lens 11c.

  In the first embodiment, information on the processing status in the imaging apparatus 100 is acquired from the system controller 50, and based on the information, the presence / absence of energization of the correction lens 11c and the position command value of the correction lens 11c are set. A controller 30d is provided.

  FIG. 3 is a diagram for explaining the operation at the time of movement control of the correction lens 11c according to the first embodiment of the present invention, and corresponds to FIG. 9 in the conventional explanation.

  In the first embodiment of the present invention, it is assumed that the imaging apparatus 100 that is in a state of being cut off (OFF) at the time of shooting standby detects half-pressing of the release switch (ON of SW1). Then, as shown in FIG. 3B, the correction lens 11c is controlled to move in minute units in synchronization with the image readout timing. Since the movement of such a minute unit is short, the time required for the movement is also short, and the influence on the exposure image of the frame can be minimized. Therefore, the shake of the display image due to the movement can be suppressed, and an image with almost no shake due to the movement of the correction lens 11c can be cut out.

  Next, a series of operations of the imaging apparatus 100 having the above configuration will be described with reference to the flowchart of FIG.

  In step S101, the imaging apparatus 100 is in a shooting standby state. From this state, the process proceeds to step S102, and an image is captured in synchronization with the image reading timing of the image sensor 21. In the next step S103, it is determined whether or not the switch SW1 is turned on. If it is not turned on, the process proceeds to step S104, and the power supply to the actuator 11d that drives the correction lens 11c is cut off to enter the power saving state. . That is, the image blur correction is not functioned. In this case, the correction lens 11c is located at a position deviated from the center of the optical axis of the actual imaging optical system 10 due to the influence of an external force such as gravity or a spring. Compared to the case where the correction lens 11c is located at the center of the corresponding optical axis, the image is shifted.

  Therefore, in the next steps S105 and S106, the position of the correction lens 11c is detected by the position detection sensor 33, and the positional relationship between the current position of the correction lens 11c and the image pickup device 21 is determined, and the image is based on that. The image area to be cut out is determined. Then, in the next steps S107 and S108, image clipping processing is performed in accordance with the determined image area, and the clipped image is displayed on the image display unit 7. As a result, the angle of view between the actually captured image and the image displayed on the image display unit 7 is eliminated.

  If it is determined in step S103 that the switch SW1 is turned on, the process proceeds to step S109, and energization for driving the correction lens 11c is started. If energization has already started, energization is maintained. In the next step S110, the image readout frame obtained at that time is a frame in the process until the correction lens 11c is moved to the initial position in the energized state, and the correction lens 11c is driven synchronously. It is determined whether or not it is a frame. That is, it is determined whether it is a position update frame. As a result of the determination, if it is not the position update frame, the process immediately proceeds to step S115. The update of the position of the correction lens 11c is determined by its responsiveness, but the frequency of the position update may be synchronized with every frame for reading an image from the image sensor 21, or every few frames. It can be synchronized. If the synchronization is performed every frame, all the frames in the process until the correction lens 11c moves to the initial position in the energized state become position update frames. If the frames are synchronized every several frames, the position of the frame is updated. It becomes a frame.

  If it is determined in step S110 that the frame is a position update frame, in steps S111 to S114, control is performed to update the position of the correction lens 11c in synchronization therewith. Specifically, in step S111, it is determined whether the position where the correction lens 11c should move next has reached the initial position where the correction lens 11c is energized. If it is determined that it has reached, the process proceeds to step S113. When it is determined that the position has not been reached, the process proceeds to step S112, and the current position command value is calculated by adding a predetermined unit movement amount to the previous position command value in order to obtain the position where the correction lens 11c should move next. To do. Here, the predetermined unit movement amount is a minute unit movement amount as shown in FIG. 3A, and the direction of the movement is the initial position at the start of image stabilization, that is, the direction of the initial position at the start of energization. . In step S113, the position command value calculated in this way is set in the shake correction control unit 31, and the correction lens 11c is driven in step S114 accordingly.

  Thereafter, in steps S115 to S118, the position of the actual correction lens 11c is acquired by the position detection sensor 32, and an image area for cutting out an image to be displayed on the image display unit 7 such as an LCD is calculated from the position information. The image is cut out and displayed. In step S119, general autofocus (AF) processing and exposure amount calculation (AE) processing are performed.

  In the next step S120, it is determined whether or not the correction lens 11c has reached the initial position at the start of energization, that is, whether or not the movement of the correction lens 11c has been completed. If not, the process returns to step S102. On the other hand, if it is determined that the movement of the correction lens 11c has been completed, the process proceeds to step S121 and waits for the switch SW2 to be turned on. When the switch SW2 is turned on, in steps S122 to S126, the correction lens 11c is moved to the target position, and an image for a recorded image is captured from the image sensor 21. Then, power is turned off to the correction lens 11c, image compression processing, media recording processing, and the like are performed to record an image. Thereafter, the process returns to the shooting standby state in step S101, and the same operation is repeated thereafter. As shown in FIG. 3, after the switch SW2 is turned on, the correction lens 11c is sequentially moved to the target position in accordance with the camera shake, so that the subject image formed on the image sensor 21 during the exposure period is displayed. Anti-vibration operation is performed to reduce runout At the start of this image stabilization operation, the correction lens 11c is moved to the initial position, so that the correction lens 11c can be moved in a wide range about the optical axis center of the optical system, and a more effective image stabilization operation is performed. It becomes possible.

  In the first embodiment, the image is cut out so that the center of the image displayed on the image display unit 7 in the power saving state in which the energization to the correction lens 11c is cut off coincides with the center of the image in the energized state. The display (image processing display) is performed in the same manner as in the prior art. However, in the first embodiment, when shifting from the power saving state to the normal energization state, the driving amount (position command value) of the correction unit is changed in minute units in synchronization with the image reading timing of the image sensor 21. Further, it is different from the conventional point in that cut-out display (image processing display) is performed according to the position of the correction means at that time.

  Therefore, image blur caused by the movement of the correction lens 11c when shifting from the power saving state to the normal energization state is suppressed, and thereby, the captured and recorded image is displayed on the image display unit 7 without causing image blur or field angle deviation. The same image can be displayed. In addition, from this, it is possible to more accurately acquire the focus evaluation value and the exposure state information from the image.

  FIG. 5 is a diagram for explaining an operation at the time of movement control of the correction lens according to the second embodiment of the present invention. Since the circuit configuration of the imaging apparatus is the same as that in FIG. 1, the description thereof is omitted.

  When the imaging apparatus 100, which is in a state where the power supply is cut off at the time of shooting standby, detects that the release switch is half-pressed (switch SW1 is turned on), the center position of the imaging optical system 10 (the center of the optical axis) ) To move the correction lens 11c. In the case of such an operation, as in the first embodiment, since it takes time to move to the center position, there is a possibility that the display image becomes a shaken image.

  Therefore, in the second embodiment of the present invention, in the frame during the movement period of the correction lens 11c, the actually exposed image is not used for display, but the image before the correction lens 11c is moved is frozen (freeze). ) Display temporarily as an image. By doing so, it is intended to avoid a state in which a shaken image is displayed on the image display unit 7 even though the imaging apparatus 100 is not shaken.

  A series of operations of the imaging apparatus 100 according to the second embodiment of the present invention including the above operations will be described with reference to the flowchart of FIG.

  In step S201, the imaging apparatus 100 is in a shooting standby state. From this state, the process proceeds to step S202, and an image is captured in synchronization with the frame exposure timing to the image sensor 21. In the next step S203, it is determined whether or not the switch SW1 is turned on. If not, the process proceeds to step S204. In steps S204 to S210, in substantially the same manner as in the first embodiment, an area to be cut out is obtained based on the position of the correction lens 11c in the power saving state, and the image capture, autofocus processing, and the area of the cut out area are obtained. The image is displayed on the image display unit 7.

  On the other hand, if the release switch is half-pressed (switch SW1 is ON), in step S211 to S213, a position command value is set so that the correction lens 11c is at the center of the optical axis, and control is performed. In step S214, it is determined whether or not the position of the correction lens 11c has reached the center of the optical axis. As a result of the determination, if it has reached, the image is cut out in steps S215 and S216, and the image is displayed. If not, the process proceeds to step S217, and the image of the frame immediately before the start of energization is displayed as a freeze image as it is.

  Thereafter, in steps S218 to S220, a general autofocus (AF) process, exposure amount calculation (AE) process, and the switch SW2 are turned on. When the switch SW2 is turned on, in steps S221 to S225, an image for a recorded image is captured from the image sensor 21, image compression processing, media recording processing, and the like are performed, and an image is recorded. Thereafter, the process returns to the shooting standby state in step S201, and thereafter the same operation is repeated.

  In the second embodiment, the image is cut out and displayed so that the center of the image displayed on the image display unit 7 in the power saving state in which the energization to the correction lens 11c is cut off coincides with the center of the image in the energized state. (Image processing display) is performed in the same manner as in the prior art. However, the second embodiment is different from the conventional one in that when shifting from the power saving state to the normal energization state, the image processing and display method is changed in synchronization with the image reading timing of the image sensor 21.

  That is, in the second embodiment, in the frame during the movement period of the correction lens 11c, the image before the correction lens 11c is moved is set as a freeze image, and this image is temporarily displayed. In other words, the image displayed on the image display unit 7 as the display unit immediately before the correction unit 11c is driven is displayed as it is.

  Therefore, it is possible to suppress image blur caused by the movement of the correction lens 11c, and thereby display an image equivalent to the photographic recording image on the image display unit 7 without causing image blur or field angle deviation. In addition, from this, it is possible to more accurately acquire the focus evaluation value and the exposure state information from the image.

  Next, an image pickup apparatus according to Embodiment 3 of the present invention will be described. It is assumed that the circuit configuration of the imaging apparatus is the same as that in FIG.

  In the third embodiment of the present invention, as in the first embodiment, it is considered that the correction lens is moved by the unit movement amount for each position update frame. However, when the unit movement amount is large and the movement is not completed within one frame, the display image of the immediately preceding frame is frozen for the moving frame as in the second embodiment. It is. This assumes a case where it is desired to immediately bring the correction lens to the image stabilization start position even when the correction lens has a large response and movement amount.

  A series of operations of the imaging apparatus 100 according to the third embodiment of the present invention including the above operations will be described with reference to a flowchart of FIG.

  In step S301, the imaging apparatus 100 is in a shooting standby state. From this state, the process proceeds to step S302, and an image is captured in synchronization with the frame exposure timing to the image sensor 21. In the next step S303, it is determined whether or not the switch SW1 is turned on. If not, the process proceeds to step S304. Then, in steps S304 to S308, as in the first embodiment, an area for cutting out an image is obtained based on the position of the correction lens 11c in the power saving state, the image is captured, and the image of the cut out area is displayed in the image display unit. 7 is displayed.

  On the other hand, if the release switch is half-pressed (switch SW1 is ON), in steps S309 to S314, the position of the correction lens 11c is updated by the unit movement amount in synchronization with the timing of the position update frame. The lens 11c is controlled. Then, in the next step S317, it is determined whether or not the current position of the correction lens 11c has reached the position command position. As a result of the determination, if it has reached, the process proceeds to steps S318 and S319, the image cut-out position is obtained from the position information of the correction lens 11c, the image cut-out process is performed, and the image is displayed. If not, the process proceeds to step S320, and the immediately preceding image is frozen and displayed as it is.

  Thereafter, in steps S321 to S323, a general autofocus (AF) process, exposure amount calculation (AE) process, and the switch SW2 are turned on. When the switch SW2 is turned on, in steps S324 to S328, an image for a recorded image is captured from the image sensor 21, an image compression process, a media recording process, and the like are performed, and an image is recorded. Thereafter, the process returns to the shooting standby state in step S301, and thereafter the same operation is repeated.

  In the third embodiment, the image is cut and displayed so that the center of the image displayed on the image display unit 7 in the power saving state in which the energization to the correction lens 11c is cut off coincides with the center of the image in the energized state. (Image processing display) is performed in the same manner as in the prior art. However, in the third embodiment, when shifting from the power saving state to the normal energization state, the driving amount (position command value) of the correction lens 11c, which is a correction unit, is changed in synchronization with the image reading timing of the image sensor 21. The point and the point which changes the way of image processing display differ from the past.

  That is, in the third embodiment, a position command value that moves the correction unit in minute units is generated in synchronization with the image reading timing. However, when the movement amount of the minute unit is large and the movement is not completed within one frame, the image immediately before the correction lens 11c is moved is set as a freeze image for the moving frame, and this image is displayed. Is temporarily displayed.

  Therefore, it is possible to suppress image blur caused by the movement of the correction lens 11c, and thereby display an image equivalent to the photographic recording image on the image display unit 7 without causing image blur or field angle deviation. In addition, from this, it is possible to more accurately acquire the focus evaluation value and the exposure state information from the image.

  In each embodiment of the present invention, the power saving state is that power supply is cut off and power is not supplied. However, power is not completely supplied but power saving is achieved by reducing power. Is also included.

  Further, the correction lens 11c is used as a mechanism (correction means) for correcting image blur. However, in the present invention, the image pickup element 21 that corrects shake by moving on a plane vertical to the variable apex prism or the optical axis. It can also be applied to. For example, in the case of the image sensor 21 that performs shake correction by moving on a plane perpendicular to the optical axis, the configuration shown in FIG. 8 can be used.

  Here, the correction means shown in FIG. 8 will be described. Reference numeral 21 denotes an image sensor, reference numerals 901 and 902 denote drive coils, and reference numerals 903 and 904 denote hall elements that detect the position of the movable part. Here, the movable part is a part including the imaging unit 109. Reference numerals 905, 906, 907, and 908 denote magnets. Reference numeral 909 denotes a first holding portion, 910 denotes a first guide portion provided on the first holding portion 909, 911 denotes a second holding portion, and 912 denotes a second holding portion 911. A second guide part 913 indicates a third holding part fixed to the casing. Reference numeral 914 denotes a first elastic body provided between the first holding part 909 and a fixing part (not shown), and 915 is provided between the second holding part 911 and a fixing part (not shown). A 2nd elastic body is shown. The directions guided by the first guide part 910 and the second guide part 912 are orthogonal to each other. In addition, the first holding unit 909 provided with the imaging element 21 is elastically supported by the first elastic body 914 and the second elastic body 915.

  With this configuration, the image sensor 21 can be moved in a plane orthogonal to the optical axis, and is substantially the same as the configuration in which the correction lens 11c included in the imaging optical system is moved.

(Correspondence between the present invention and the embodiment)
The image pickup device 21 corresponds to the image pickup means of the present invention, the image display unit 7 corresponds to the display means of the present invention, the actuator 11d corresponds to the drive means of the present invention, and the position detection sensor 32 corresponds to the position detection means of the present invention. The correction lens 11c and the image sensor 21 correspond to correction means for correcting image shake by moving a subject image relative to the image pickup means of the present invention. Further, for example, the part of the system controller 50 performing the operations of steps S115 to S117 in FIG. 4 corresponds to the image processing means of the present invention, and the part of performing the operations of steps S111 to S114 in FIG. 4 corresponds to the control means of the present invention. To do. Further, the power saving state in which the correction unit does not function means a state in which energization to the actuator 11d is OFF and image blur correction is not performed. The energization state in which the correction unit functions does not mean that the actuator 11d is energized. Means that the image blur correction is performed.

It is a figure which shows the structure of the imaging device concerning Example 1 of this invention. FIG. 2 is a block diagram illustrating a configuration of a shake correction control unit 31 in FIG. 1. It is a figure for demonstrating the operation | movement at the time of the movement control of the correction lens 11c concerning Example 1 of this invention. 3 is a flowchart illustrating an operation of the imaging apparatus according to the first embodiment of the present invention. It is a figure for demonstrating the operation | movement at the time of movement control of the correction lens 11c concerning Example 2 of this invention. It is a flowchart which shows operation | movement of the imaging device concerning Example 2 of this invention. It is a flowchart which shows operation | movement of the imaging device concerning Example 3 of this invention. It is a perspective view which shows the other structural example of the correction | amendment means concerning this invention. It is a figure for demonstrating the image blurring which arises by the movement of a correction lens conventionally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 7 Image display part 10 Imaging optical part 11c Correction lens 11d Actuator 21 Image pick-up element 30 Shake correction apparatus 31 Shake correction control part 32 Position detection sensor 33 Shake sensor 50 System controller 100 Imaging apparatus

Claims (6)

Display means for displaying an image from the imaging means;
Correction means for correcting image blur by moving a subject image relative to the imaging means;
Driving means for driving the correction means;
Position detecting means for detecting the position of the correcting means;
The center of the image displayed on the display unit in the power saving state where the correction unit does not function matches the center of the image displayed on the display unit in the energized state where the correction unit functions. In addition, according to the position information from the position detection means, the image processing means that processes the image from the imaging means and displays the image on the display means;
Control for moving the correction unit by an amount of unit movement toward the initial position of the energized state by the drive unit in synchronization with the image reading timing from the imaging unit when the power saving state shifts to the energized state And an imaging device.   The imaging apparatus according to claim 1, wherein image blur correction is not performed during a period in which the correction unit is moved toward the initial position.   The imaging apparatus according to claim 1, wherein the image processing unit displays an image on the display unit in synchronization with the movement of the correction unit by the control unit.   The imaging apparatus according to claim 1, wherein the processing of the image is cutting out a part of the image from the imaging unit. Displaying the image from the imaging means on the display means;
Moving a subject image relative to the imaging unit by a correction unit to correct image shake;
The center of the image displayed on the display unit in the power saving state where the correction unit does not function matches the center of the image displayed on the display unit in the energized state where the correction unit functions. And processing the image from the imaging means according to the position information from the position detecting means for detecting the position of the correcting means, and displaying the processed image on the display means.
And a step of moving the correction unit by a unit movement amount toward an initial position of the energized state in synchronization with an image reading timing from the imaging unit when the energized state is shifted from the power saving state. A control program characterized by   A recording medium in which the control program according to claim 5 is recorded.

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