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WO2015060077A1 - Dispositif et procédé de capture de vidéos mouvantes - Google Patents

Dispositif et procédé de capture de vidéos mouvantes Download PDF

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Publication number
WO2015060077A1
WO2015060077A1 PCT/JP2014/076077 JP2014076077W WO2015060077A1 WO 2015060077 A1 WO2015060077 A1 WO 2015060077A1 JP 2014076077 W JP2014076077 W JP 2014076077W WO 2015060077 A1 WO2015060077 A1 WO 2015060077A1
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WO
WIPO (PCT)
Prior art keywords
moving image
frame rate
drive signal
drive
subject
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2014/076077
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English (en)
Japanese (ja)
Inventor
篤志 松谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Imaging Co Ltd
Original Assignee
Ricoh Imaging Co Ltd
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Filing date
Publication date
Application filed by Ricoh Imaging Co Ltd filed Critical Ricoh Imaging Co Ltd
Priority to JP2015543770A priority Critical patent/JPWO2015060077A1/ja
Publication of WO2015060077A1 publication Critical patent/WO2015060077A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/681—Motion detection
    • H04N23/6812—Motion detection based on additional sensors, e.g. acceleration sensors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • H04N23/685—Vibration or motion blur correction performed by mechanical compensation
    • H04N23/687—Vibration or motion blur correction performed by mechanical compensation by shifting the lens or sensor position
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/10—Circuitry of solid-state image sensors [SSIS]; Control thereof for transforming different wavelengths into image signals
    • H04N25/11—Arrangement of colour filter arrays [CFA]; Filter mosaics
    • H04N25/13—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements
    • H04N25/134—Arrangement of colour filter arrays [CFA]; Filter mosaics characterised by the spectral characteristics of the filter elements based on three different wavelength filter elements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0007—Movement of one or more optical elements for control of motion blur
    • G03B2205/0015—Movement of one or more optical elements for control of motion blur by displacing one or more optical elements normal to the optical axis

Definitions

  • the present invention relates to a moving image capturing apparatus and a moving image capturing method for obtaining an optical low-pass filter effect by driving a moving member (shake correction member) in a direction different from the optical axis of a photographing optical system (for example, in a plane orthogonal to the optical axis).
  • a moving member shake correction member
  • Patent Document 1 discloses a photographing apparatus that obtains an optical low-pass filter effect by driving (microvibration) a moving member (shake correction optical system) forming a part of a photographing optical system in a plane orthogonal to the optical axis. Has been.
  • Patent Document 1 mainly focuses on how to move a moving member to obtain an optical low-pass filter effect when taking a still image, and captures a moving image (moving image in a memory or the like).
  • a moving image moving image in a memory or the like.
  • moving image capturing has been emphasized also in single-lens reflex cameras.
  • the optical low-pass filter effect is uneven, and moire fringes and false colors are stabilized. Have been found to tend to be difficult to remove. Further, when an optical low-pass filter effect is to be obtained by driving the moving member, increase in power consumption, high frequency noise and vibration becomes a problem.
  • the present invention has been made on the basis of the above problem awareness.
  • a moving image capturing apparatus and moving image capturing method that obtain an optical low-pass filter effect by driving a moving member, an optical low-pass that is uniform and has no unevenness.
  • An object is to realize a filter effect, stably remove moiré fringes and false colors, and effectively suppress power consumption, high-frequency noise, and vibration.
  • the present inventor determines a frame rate at the time of moving image capturing and a drive frequency of a drive signal for driving the moving member. I found a close relationship between them. Then, the present inventor realizes a uniform and non-uniform optical low-pass filter effect by optimally setting the drive frequency of the drive signal for driving the moving member according to the frame rate at the time of moving image capturing, The present invention has been completed with the conclusion that moire fringes and false colors can be stably removed and power consumption, high frequency noise and vibration can be effectively suppressed.
  • the moving image pickup apparatus of the present invention is a moving image pickup apparatus having an image sensor that converts a subject image formed by a shooting optical system into an electrical pixel signal and picks up a moving image of the subject, and is at least one of the shooting optical system.
  • At least one of the optical element forming the part and the image sensor is a moving member (shake correction member), and the moving member is driven in a direction different from the optical axis of the photographing optical system to detect the subject light flux by the image sensor.
  • a drive mechanism that obtains an optical low-pass filter effect by making it incident on a plurality of pixels of different colors, a drive signal generator that generates a drive signal for driving the moving member via the drive mechanism, A frame rate setting unit for setting a frame rate for capturing a moving image, and a frame rate set by the frame rate setting unit It is characterized by having a driving frequency control unit for controlling the drive frequency of the drive signal the driving signal generating unit generates.
  • the drive frequency control unit when the frame rate set by the frame rate setting unit is A [Hz (fps)], and the drive frequency of the drive signal generated by the drive signal generation unit is B [Hz], It is preferable to control the drive frequency B [Hz] of the drive signal generated by the drive signal generator so as to satisfy B ⁇ 0.5A.
  • the drive frequency control unit when the frame rate set by the frame rate setting unit is A [Hz (fps)], and the drive frequency of the drive signal generated by the drive signal generation unit is B [Hz], More preferably, the drive frequency B [Hz] of the drive signal generated by the drive signal generation unit is controlled so as to satisfy 0.5A ⁇ B ⁇ 1.5A.
  • the moving image pickup apparatus of the present invention further includes a shake detection unit that detects a shake in a plane orthogonal to the optical axis of the body main body on which the image sensor is mounted, and the drive signal generation unit captures the moving member in the imaging mode.
  • a micro-vibration signal generation unit that generates a micro-vibration signal for micro-vibration in a direction different from the optical axis of the optical system, and the micro-vibration signal generated by the micro-vibration signal generation unit and the shake detection unit detect It is preferable to include a superimposing / synthesizing unit that generates the driving signal by superimposing and synthesizing the shake detection signal.
  • the frame rate setting unit does not drive the moving member to obtain an optical low-pass filter effect and obtains an optical low-pass filter effect without driving the moving member. It is preferable to set it smaller than the frame rate in the case of capturing moving images.
  • the moving image capturing apparatus of the present invention further includes an exposure control unit for maintaining an appropriate exposure during moving image capturing, and the exposure control unit has a subject exposure at the time of moving image capturing that is high enough to achieve proper exposure. If it cannot be obtained, it is preferable to lower the ISO sensitivity preferentially and shorten the exposure time with an electronic shutter when proper exposure cannot be obtained even if the ISO sensitivity is lowered to the minimum.
  • the drive frequency control unit preferably performs control to increase the drive frequency of the drive signal generated by the drive signal generation unit.
  • the moving image capturing apparatus of the present invention further includes an exposure control unit for maintaining an appropriate exposure during moving image capturing, and the exposure control unit has a subject exposure at the time of moving image capturing that is low enough to provide proper exposure.
  • the exposure control unit has a subject exposure at the time of moving image capturing that is low enough to provide proper exposure.
  • the moving image capturing apparatus compares the period of color change of at least a part of the moving image of the subject with the period of minute vibrations of the moving member to determine whether moire has occurred in the moving image of the subject. It is preferable to further include a moire determination unit for determining whether or not.
  • the moving image pickup apparatus of the present invention further includes a moire notification unit that notifies the moire determination unit when the moire determination unit determines that moire is generated in the moving image of the subject.
  • the moving image capturing apparatus of the present invention further includes a moving image capturing setting changing unit that changes various settings at the time of moving image capturing when the moire determination unit determines that moire has occurred in a moving image of a subject. It is preferable.
  • the moving image capturing method of the present invention includes an image sensor that converts a subject image formed by a photographing optical system into an electrical pixel signal and picks up a moving image of the subject, and an optical element that forms at least a part of the photographing optical system.
  • at least one of the image sensors is a moving member (shake correction member), and the moving member is driven in a direction different from the optical axis of the photographing optical system, whereby a subject light flux is a plurality of different detection colors of the image sensor.
  • a driving signal generating step for generating a driving signal for driving the moving member via the driving mechanism in a moving image capturing apparatus having a driving mechanism that is incident on a pixel and obtains an optical low-pass filter effect;
  • Set in the frame rate setting step for setting the frame rate for capturing moving images of the subject and the frame rate setting step.
  • it is characterized by having a driving frequency control step of controlling the drive frequency of the drive signal generated by the drive signal generating step.
  • the drive frequency control step when the frame rate set in the frame rate setting step is A [Hz (fps)] and the drive frequency of the drive signal generated in the drive signal generation step is B [Hz], It is preferable to control the drive frequency B [Hz] of the drive signal generated in the drive signal generation step so as to satisfy B ⁇ 0.5A.
  • the drive frequency control step when the frame rate set in the frame rate setting step is A [Hz (fps)] and the drive frequency of the drive signal generated in the drive signal generation step is B [Hz], It is more preferable to control the drive frequency B [Hz] of the drive signal generated in the drive signal generation step so as to satisfy 0.5A ⁇ B ⁇ 1.5A.
  • the moving image capturing method of the present invention further includes a shake detection step of detecting a shake in a plane orthogonal to the optical axis of the body main body on which the image sensor is mounted.
  • the driving signal generation step includes a micro vibration signal generation step for generating a micro vibration signal for causing the moving member to micro vibration in a direction different from the optical axis of the imaging optical system, and the micro vibration signal.
  • a superimposing and synthesizing step for generating the drive signal by superimposing and synthesizing the minute vibration signal generated in the generating step and the shake detection signal detected in the shake detecting step.
  • the frame rate for capturing moving images while driving the moving member to obtain an optical low-pass filter effect is obtained without driving the moving member and obtaining an optical low-pass filter effect. It is preferable to set it smaller than the frame rate in the case of capturing moving images.
  • the moving image capturing method of the present invention further includes an exposure control step for maintaining proper exposure during moving image capturing.
  • the exposure control step when the subject brightness at the time of moving image capturing is too high to obtain a proper exposure, the ISO sensitivity is preferentially lowered, and the proper exposure can be achieved even if the ISO sensitivity is lowered to the minimum. When it cannot be obtained, it is preferable to shorten the exposure time with an electronic shutter.
  • the drive frequency control step it is preferable to execute control to increase the drive frequency of the drive signal generated in the drive signal generation step.
  • the moving image capturing method of the present invention further includes an exposure control step for maintaining proper exposure during moving image capturing.
  • the exposure control step when the subject brightness at the time of moving image capturing is too low to obtain an appropriate exposure, the exposure time is preferentially increased by the electronic shutter, and the exposure time is increased to the maximum.
  • the moving image capturing method of the present invention determines whether or not moire has occurred in the moving image of the subject by comparing the period of color change of at least a part of the moving image of the subject with the cycle of minute vibrations of the moving member. It is preferable to further include a moire determination step for determining whether or not.
  • the moving image capturing method of the present invention further includes a moire notification step of notifying that when the moire is generated in the moving image of the subject in the moire determination step.
  • the moving image capturing method of the present invention further includes a moving image capturing setting changing step for changing various settings at the time of moving image capturing when it is determined in the moire determining step that moire has occurred in the moving image of the subject. It is preferable.
  • a uniform and non-uniform optical low-pass filter effect is realized, and moire fringes and false colors are realized.
  • Etc. can be stably removed, and power consumption, high frequency noise and vibration can be effectively suppressed.
  • FIG. 1 is a block diagram illustrating a main configuration of an image shake correction apparatus for a digital camera according to the present invention.
  • 1 is a side view illustrating a configuration of an image shake correction apparatus for a digital camera according to the present invention.
  • 4A and 4B are diagrams showing an operation for giving an optical low-pass filter effect by driving the image sensor so as to draw a predetermined locus
  • FIG. 4A is a diagram of the photographing optical system.
  • FIG. 4B shows the image sensor being drawn so as to draw a rotationally symmetric circular locus centered on the optical axis of the imaging optical system.
  • FIGS. 8A and 8B are diagrams illustrating a state in which a moire is generated in a moving image of a subject in through image shooting and displayed on the LCD.
  • FIGS. 1-10 An embodiment of a digital camera (moving image capturing apparatus) 10 according to the present invention will be described with reference to FIGS.
  • capturing a moving image of a subject refers to “moving image capturing” that stores a moving image of a subject in a storage unit (image memory 25) such as a memory and a moving image of the subject. This is used in a concept including both “through image shooting (live view shooting)” displayed in real time on the display means (LCD 24).
  • the digital camera 10 includes a body main body 20 and a photographic lens 30 that can be attached to and detached from the body main body 20 (lens exchangeable).
  • the photographic lens 30 includes, in order from the subject side (left side in FIG. 1) to the image plane side (right side in FIG. 1), a photographic lens group (photographic optical system, moving member, shake correction member) 31, and aperture ( Photographing optical system) 32.
  • the body main body 20 has a shutter (photographing optical system) 21 and an image sensor (moving member, shake correction member) 22 in order from the subject side (left side in FIG. 1) to the image plane side (right side in FIG. 1). And.
  • the body body 20 also includes a diaphragm / shutter drive circuit 23 that controls driving of the diaphragm 32 and the shutter 21 in a state where the body body 20 is attached to the photographing lens 30.
  • a subject image is formed on the light receiving surface of the image sensor 22 by the subject light flux that enters from the photographing lens group 31 and passes through the aperture 32 and the shutter 21.
  • the subject image formed on the light receiving surface of the image sensor 22 is converted into an electrical pixel signal by a large number of pixels arranged in a matrix, and is output to the DSP 40 as moving image data.
  • the DSP 40 performs predetermined image processing on the moving image data input from the image sensor 22, displays it on the LCD 24 (through image shooting (live view shooting)), and stores it in the image memory 25 (moving image shooting).
  • the photographic lens group 31 is drawn so as to be composed of a single lens (optical element).
  • the actual photographic lens group 31 may be, for example, a fixed lens, a variable magnification lens that moves during magnification, It consists of a plurality of lenses (optical elements) such as a focusing lens that moves during focusing.
  • the image sensor 22 includes a plurality of packages, a solid-state image sensor chip housed in the package, and a lid member fixed to the package so as to hermetically protect the solid-state image sensor chip. It consists of the following components.
  • “to drive the image sensor (moving member, shake correction member) 22” means “at least one of the plurality of components of the image sensor (moving member, shake correction member) 22 through which the subject luminous flux passes. Means to drive the part.
  • the photographing lens 30 includes a communication memory 33 that stores various information such as resolving power (MTF) information of the photographing lens group 31 and aperture diameter (aperture value) information of the diaphragm 32.
  • various information stored in the communication memory 33 is read into the DSP 40.
  • the body main body 20 is connected to the DSP 40 and includes a photographing operation switch 26 and a low-pass filter operation switch 27.
  • the photographing operation switch 26 includes various switches such as a power switch and a release switch.
  • the low-pass filter operation switch 27 switches on / off the low-pass filter operation for driving the image sensor 22 in a plane orthogonal to the optical axis Z of the imaging optical system (hereinafter sometimes referred to as an optical axis orthogonal plane). It is a switch for performing various settings related to operation.
  • the low-pass filter operation of the image sensor 22 will be described in detail later.
  • the body main body 20 is connected to the DSP 40 and includes a gyro sensor (a shake detection unit) 28.
  • the gyro sensor 28 detects a shake detection signal indicating a shake in the plane orthogonal to the optical axis of the body body 20 by detecting a moving angular velocity (around the X axis and the Y axis) applied to the body body 20.
  • the image sensor 22 is an image blur correction device (drive mechanism) 50 that is movable in the X-axis direction and the Y-axis direction (two orthogonal directions) orthogonal to the optical axis Z of the photographing optical system. It is mounted on.
  • the image shake correction apparatus 50 includes a fixed support substrate 51 fixed to a structure such as a chassis of the body main body 20, a movable stage 52 that fixes the image sensor 22 and is slidable with respect to the fixed support substrate 51, and fixed support.
  • Magnets M1, M2, M3 fixed on the surface of the substrate 51 facing the movable stage 52, and each magnet M1, fixed on the fixed support substrate 51 with the movable stage 52 sandwiched between the magnets M1, M2, M3,
  • For driving to generate a driving force by receiving a current in a magnetic field of the magnetic circuit fixed to the movable stage 52 and the yokes Y1, Y2, Y3 made of a magnetic material constituting the magnetic circuit between M2 and M3
  • the coils C1, C2, and C3 are provided, and an AC drive signal (AC voltage) is passed (applied) to the drive coils C1, C2, and C3, whereby the fixed support substrate 51 Movable stage 52 (image sensor 22) is adapted to drive the optical axis orthogonal plane.
  • the AC drive signal that flows through the drive coils C1, C2, and C3 is generated by an image sensor drive circuit (drive signal generation unit) 60 described later under the control of the DSP 40.
  • image sensor drive circuit 60 drive signal generation unit
  • the configuration of the image sensor drive circuit 60 and the AC drive signal generated by the image sensor drive circuit 60 will be described in detail later.
  • the image sensor 22 includes a magnetic driving unit including the magnet M1, the yoke Y1, and the driving coil C1, and a magnetic driving unit (two sets of magnetic driving units) including the magnet M2, the yoke Y2, and the driving coil C2.
  • a magnetic driving unit two sets of magnetic driving units
  • magnetic drive means a set of magnetic drive means
  • the magnet M3, the yoke Y3, and the drive coil C3 are orthogonal to the longitudinal direction of the image sensor 22.
  • the fixed support substrate 51 detects the magnetic force of the magnets M1, M2, and M3 in the vicinity (central space) of each of the driving coils C1, C2, and C3, and is orthogonal to the optical axis of the movable stage 52 (image sensor 22).
  • Hall sensors H1, H2, and H3 for detecting a position detection signal indicating the position in the plane are arranged.
  • the position and tilt (rotation) of the movable stage 52 (image sensor 22) are detected by the hall sensors H1 and H2, and the position of the movable stage 52 (image sensor 22) is detected by the hall sensor H3.
  • the DSP 40 includes a shake detection signal indicating a shake in the plane orthogonal to the optical axis of the body main body 20 detected by the gyro sensor 28 and an image sensor detected by the hall sensors H1, H2, and H3 via an image sensor driving circuit 60 described later.
  • the image sensor 22 is driven in the optical axis orthogonal plane by the image blur correction device 50 based on the position detection signal indicating the position in the optical axis orthogonal plane 22. Thereby, the image formation position of the subject image on the image sensor 22 can be displaced, and the image shake due to the camera shake can be corrected. In the present embodiment, this operation is referred to as “image blur correction operation (image blur correction drive) of the image sensor 22”.
  • the image shake correction apparatus 50 drives the image sensor 22 so as to draw a predetermined locus in a plane orthogonal to the optical axis Z of the photographing optical system, and the subject light flux is detected in a plurality of different colors detected by the image sensor 22.
  • an optical low-pass filter effect hereinafter sometimes referred to as an LPF effect
  • this operation is referred to as “low-pass filter operation (LPF operation, LPF drive) of the image sensor 22”.
  • the image shake correction apparatus 50 executes “center holding operation (center holding drive) of the image sensor 22” that holds the image sensor 22 at the center position of the image shake correction operation range (image shake correction drive range). To do. For example, when “image blur correction operation of image sensor 22 (image blur correction drive)” and “LPF operation of image sensor 22 (LPF drive)” are both off, “center holding operation of image sensor 22 (center holding operation”). (Driving) "is turned on, and shooting is performed (the center is maintained without image blur correction).
  • Image sensor 22 image blur correction operation (image blur correction drive)”, “image sensor 22 LPF operation (LPF drive)” and “center holding operation (center holding drive) of image sensor 22” are combined operations of these.
  • a mode realized by the image blur correction device 50 as (combining drive) or a mode in which only one of these operations (drive) is realized by the image blur correction device 50 alone is possible.
  • an image sensor 22 includes a large number of pixels 22a arranged in a matrix at a predetermined pixel pitch P on the light receiving surface, and any one of the color filters R, G, and B in a Bayer array on the front surface of each pixel 22a. Is arranged.
  • Each pixel 22a detects the color of the subject light beam that has passed through one of the color filters R, G, and B on the front surface, that is, photoelectrically converts light of a color component (color band), and the intensity (luminance) ) Is stored.
  • FIG. 4A shows a case where the image sensor 22 is driven so as to draw a rotationally symmetric square locus around the optical axis Z of the photographing optical system.
  • This square locus can be, for example, a square closed path with the pixel pitch P of the image sensor 22 as one side.
  • the image sensor 22 is arranged in units of one pixel pitch P in the Y-axis direction parallel to one (vertical direction) of the pixels 22a orthogonal to each other and in the X-axis direction parallel to the other (horizontal direction). Are alternately moved to form a square path.
  • FIG. 4B shows a case where the image sensor 22 is driven to draw a rotationally symmetric circular locus centering on the optical axis Z of the photographing optical system.
  • This circular locus can be a circular closed path having a radius r of 2 1/2 / 2 times the pixel pitch P of the image sensor 22.
  • the image sensor 22 when the image sensor 22 is driven so as to draw a square or circular predetermined locus during exposure, the light enters the center of each color filter R, G, B (pixel 22a). Since the subject light beam (light beam) is equally incident on the four color filters R, G, B, and G, the same effect as the optical low-pass filter can be obtained. In other words, since light rays incident on any color filter R, G, B, G (pixel 22a) are necessarily incident on the surrounding color filters R, G, B, G (pixel 22a), the optical low-pass filter is also very much optical. The same effect (LPF effect) as the light beam passed through is obtained.
  • the strength of the LPF effect by the image sensor 22 can be increased. It can be switched in stages. That is, the radius r of one side of the square locus or the circular locus is increased (the range of the pixel 22a incident on the pixel 22a (color filter R, G, B, G) having a different detection color of the image sensor 22 on which the subject light ray is incident).
  • the LPF effect is strengthened, while the radius r of one side of the square locus or the circular locus is shortened (pixels 22a (color filters R, G, and B) having different detection colors of the image sensor 22 on which the subject ray is incident. , G)), the LPF effect is weakened.
  • the driving range of the image sensor 22 and the LPF effect can be switched in four stages of “OFF”, “small”, “medium”, and “large”.
  • the driving range of the image sensor 22 and the LPF effect being “OFF” mean that the image sensor 22 is not driven and therefore the LPF effect cannot be obtained.
  • the switching of the driving range of the image sensor 22 and the LPF effect can be performed, for example, by a manual operation of the low-pass filter operation switch 27 or by the DSP 40 automatically based on various shooting condition parameters.
  • the digital camera 10 causes the image sensor 22 to be orthogonal to the optical axis via the image blur correction device 50 by causing an AC drive signal to flow through the drive coils C 1, C 2, and C 3.
  • An image sensor drive circuit (drive signal generation unit) 60 that drives in a plane is provided. The overall operation of the image sensor driving circuit 60 is controlled by the DSP 40.
  • the image sensor driving circuit 60 includes an adding unit 61, a gain unit 62, a minute vibration signal generating unit 63, an LPF switch 64, a superimposing / synthesizing unit 65, and a controller 66. ing.
  • the adding unit 61 performs addition processing on a shake detection signal indicating a shake in the plane orthogonal to the optical axis of the body main body 20 detected by the gyro sensor 28.
  • the gain unit 62 amplifies the shake detection signal to which the addition unit 61 has performed the addition process.
  • the gain unit 62 amplifies the shake detection signal subjected to the addition process by the addition unit 61 in accordance with the focal length information of the photographing lens 30 acquired through lens communication with the photographing lens 30.
  • the focal length information of the photographic lens 30 is included in the gain for the gain unit 62 to amplify the shake detection signal.
  • the minute vibration signal generation unit 63 generates a minute vibration signal for obtaining the LPF effect by causing the image sensor 22 to vibrate in the plane orthogonal to the optical axis.
  • the LPF switch 64 determines whether or not to obtain the LPF effect by causing the image sensor 22 to vibrate in the plane orthogonal to the optical axis by switching between passing and blocking the minute vibration signal generated by the minute vibration signal generator 63. It is a switch for switching.
  • the superimposing / synthesizing unit 65 superimposes and synthesizes the micro-vibration signal generated by the micro-vibration signal generating unit 63 and the shake detection signal amplified by the gain unit 62 after the addition unit 61 performs the addition process, thereby generating image blur.
  • a drive signal for driving the image sensor 22 in the plane orthogonal to the optical axis is generated via the correction device 50.
  • the controller 66 drives the image sensor 22 in the plane orthogonal to the optical axis by causing the drive signal generated by the superposition synthesis unit 65 to flow through the driving coils C1, C2, and C3.
  • the LPF operation is executed.
  • PID control can be considered. From the PID control, a duty ratio for driving the driving coils C1, C2, and C3 is output by PWM control.
  • the DSP 40 includes a frame rate setting unit 41, a drive frequency control unit 42, an exposure control unit 43, a moire determination unit 44, a moire notification unit 45, and a moving image imaging setting change unit 46.
  • the frame rate setting unit 41 sets a frame rate when shooting a moving image of a subject.
  • the frame rate set by the frame rate setting unit 41 can be, for example, 30 [Hz (fps)] or 60 [Hz (fps)].
  • the frame rate setting unit 41 drives the image sensor 22 in the plane orthogonal to the optical axis by driving the image sensor 22 in the plane orthogonal to the optical axis to obtain a frame rate when moving images are captured while obtaining an optical low-pass filter effect.
  • the frame rate is set to be smaller than the frame rate when the moving image is captured without obtaining the optical low-pass filter effect.
  • the frame rate setting unit 41 sets the frame rate in the former case to 15 [Hz (fps)] and sets the frame rate in the latter case to 30 [Hz (fps)], or the former In this case, the frame rate in this case is set to 30 [Hz (fps)] and the frame rate in the latter case is set to 60 [Hz (fps)].
  • the drive frequency control unit 42 controls the drive frequency of the drive signal generated by the image sensor drive circuit 60 according to the frame rate set by the frame rate setting unit 41.
  • the drive frequency control unit 42 It is preferable to control the drive frequency B [Hz] of the drive signal generated by the image sensor drive circuit 60 so as to satisfy B ⁇ 0.5A.
  • the drive frequency control unit 42 has a drive frequency of the drive signal generated by the image sensor drive circuit 60 of 15 [Hz] or more. Control is performed as follows.
  • the drive frequency control unit 42 It is more preferable to control the drive frequency B [Hz] of the drive signal generated by the image sensor drive circuit 60 so as to satisfy 0.5A ⁇ B ⁇ 1.5A.
  • the drive frequency control unit 42 has a drive frequency of the drive signal generated by the image sensor drive circuit 60 of 30 [Hz] or more. In addition, control is performed so that the frequency is 90 [Hz] or less.
  • the drive signal generated by the image sensor drive circuit 60 according to the frame rate set by the frame rate setting unit 41 so that the drive frequency control unit 42 satisfies 0.5A ⁇ B ⁇ 1.5A.
  • the driving frequency By optimally setting the driving frequency, a uniform and uniform optical low-pass filter effect can be realized, and moire fringes and false colors can be stably removed.
  • FIG. 6 shows the movement of the image sensor 22 in the plane orthogonal to the optical axis when the LPF effect is turned on and when the LPF effect is turned off.
  • the horizontal axis represents time
  • the vertical axis represents the movement amount.
  • the movement amount on the vertical axis is divided into an X-direction movement amount and a Y-direction movement amount.
  • the frame rate set by the frame rate setting unit 41 is 30 [Hz (fps)], and the drive frequency of the drive signal generated by the image sensor drive circuit 60 is 30 [Hz] (the image sensor in one frame of moving image capturing). 22 makes one round).
  • the LPF effect is off
  • the image sensor 22 is driven following the control target obtained from the gyro sensor 28.
  • the LPF effect is ON
  • the image sensor 22 is driven by superimposing the minute vibration signal generated by the minute vibration signal generating unit 63 on the control target obtained from the gyro sensor 28.
  • the exposure control unit 43 performs exposure control for maintaining proper exposure at the time of moving image capturing.
  • the exposure controller 43 preferentially lowers the ISO sensitivity when the subject brightness at the time of moving image capturing is too high to obtain an appropriate exposure, and an appropriate exposure cannot be obtained even if the ISO sensitivity is lowered to the minimum.
  • the exposure control unit 43 preferentially lengthens the exposure time with the electronic shutter when the subject brightness at the time of moving image capturing is too low to obtain a proper exposure, and is appropriate even if the exposure time is maximized. Increase ISO sensitivity when exposure cannot be obtained.
  • FIG. 7 is a timing chart showing the relationship between subject brightness, ISO sensitivity, and exposure time when a moving image is captured by the digital camera 10.
  • the ISO sensitivity changes in order to maintain proper exposure. If even the lowest ISO 100 that can be set does not provide proper exposure, the exposure time is shortened from 1/30 s using an electronic shutter. The lower limit of the exposure time is 1/60 s. Thereby, a half cycle of the driving cycle of the image sensor 22 can be secured within the exposure time, and the optical low-pass filter effect is slightly reduced, but the effect can be realized.
  • the predetermined frequency obtained from the reciprocal of the exposure time by the electronic shutter of each frame of moving image capturing is at least twice the frame rate set by the frame rate setting unit 41.
  • the drive frequency control unit 42 performs control to increase the drive frequency of the drive signal generated by the image sensor drive circuit 60.
  • the moire determination unit 44 compares the color change period of at least a part of the moving image of the subject with the period of the minute vibration of the image sensor 22 to determine whether or not moire has occurred in the moving image of the subject. judge.
  • the moire notification unit 45 notifies (warns) that effect by means of an image or sound through the LCD 24 or a speaker (not shown).
  • FIGS. 8A and 8B show a state in which it is notified by displaying on the LCD 24 that moire has occurred in the moving image of the subject in live view shooting (live view shooting).
  • the frame rate for live view shooting is 30 [Hz (fps)]
  • the drive frequency of the drive signal for driving the image sensor 22 is 2 [Hz]
  • the amplitude is moved by one pixel.
  • the through image repeats the state of FIG. 8A and the state of FIG. 8B alternately, and the red false color and the green false color change alternately. This makes it easier for the user (photographer) to notice moire.
  • a mode in which a color change at a frequency of 2 [Hz] is extracted by image processing, is colored by OSD, and is highlighted is also possible.
  • the moving image imaging setting change unit 46 changes various settings for moving image imaging. For example, when the moire determination unit 44 determines that moire has occurred in the moving image of the subject, the moving image imaging setting change unit 46 forcibly drives the image sensor 22 in the optical axis orthogonal plane to optically By obtaining a low-pass filter effect, control is performed to reduce or eliminate moire of the moving image of the subject. In addition, the moving image imaging setting change unit 46 detects the angle of view by the photographing lens 30 in real time, and executes control for automatically switching on / off and strength of the LPF effect by the image sensor 22 according to the detected angle of view.
  • the image sensor driving circuit (driving signal generation unit) 60 has the image sensor (moving member) 22 via the image blur correction apparatus (driving mechanism) 50.
  • the frame rate setting unit 41 sets a frame rate for capturing a moving image of the subject, and the drive frequency control unit 42 sets the frame rate set by the frame rate setting unit 41. Accordingly, the drive frequency of the drive signal generated by the image sensor drive circuit 60 is controlled. As a result, a uniform and uniform optical low-pass filter effect can be realized, and moire fringes and false colors can be stably removed. At the same time, it is possible to suppress power consumption, high frequency noise and vibration for obtaining an optical low-pass filter effect.
  • the image sensor 22 is described as the “moving member, shake correction member”, and the mode in which the image sensor 22 is driven in the plane orthogonal to the optical axis has been described.
  • the present invention is limited to this. It is not a thing.
  • a lens (optical element) forming at least a part of the photographic lens group (photographic optical system) 31 is a “moving member, shake correction member”, and this lens (optical element) is provided in the photographic lens 30.
  • a mode of driving in a plane orthogonal to the optical axis by the (drive mechanism) is also possible.
  • both the image sensor 22 and the lens (optical element) forming at least a part of the photographing lens group (photographing optical system) 31 are “moving members and shake correcting members”, and these are driven in an optical axis orthogonal plane.
  • the image blur is corrected by displacing the imaging position of the subject image on the image sensor 22, and the subject light flux is incident on a plurality of pixels having different detection colors of the image sensor 22 to optically. A typical low-pass filter effect can be obtained.
  • the image sensor (moving member, shake correction member) 22 is driven in the plane orthogonal to the optical axis via the image shake correction device (drive mechanism) 50 in order to execute the image shake correction operation and the LPF operation.
  • the direction in which the image sensor (moving member, shake correction member) 22 is driven is not limited to this, and may be any direction different from the optical axis of the photographing optical system.
  • the DSP 40 and the image sensor drive circuit 60 are drawn as separate components (blocks), but an aspect in which these are realized as a single component (block) is also possible.
  • the image blur correction device (drive mechanism) 50 is configured such that the magnets M1, M2, M3 and the yokes Y1, Y2, Y3 are fixed to the fixed support substrate 51, and the drive coil C1,
  • C2 and C3 have been described as an example.
  • the mode in which the body main body 20 and the photographic lens 30 are detachable has been described as an example, but the mode in which the body main body 20 and the photographic lens 30 are not detachable (lens exchangeable) Is also possible.
  • the digital camera 10 can also capture a still image of a subject.
  • the frame rate setting unit 41 sets the frame rate for capturing a moving image of the subject
  • the drive frequency control unit 42 sets the image according to the frame rate set by the frame rate setting unit 41.
  • the case where the drive frequency of the drive signal generated by the sensor drive circuit 60 is controlled has been described as an example. However, considering that the human audible range is 20 Hz, the frame rate set by the frame rate setting unit 41 and the drive frequency of the drive signal generated by the image sensor drive circuit 60 are both predetermined values (for example, less than 20 Hz). A mode of setting to 15 Hz) is also possible.
  • the moving image capturing apparatus and moving image capturing method of the present invention are suitable for use in a moving image capturing apparatus such as a digital camera and a moving image capturing method.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Studio Devices (AREA)
  • Exposure Control For Cameras (AREA)
  • Adjustment Of Camera Lenses (AREA)
  • Color Television Image Signal Generators (AREA)

Abstract

La présente invention a notamment pour objet, par rapport à un dispositif de capture de vidéos mouvantes et à un procédé de capture de vidéos mouvantes qui réalisent un effet de filtre optique passe-bas en entraînant un élément mobile, de mettre en œuvre un effet uniforme de filtre optique passe-bas sans irrégularité, d'éliminer de façon stable le moirage, le bruit coloré, etc., et d'atténuer efficacement la consommation énergétique, le bruit en radiofréquences et les vibrations. Une unité (60) de génération de signal d'entraînement génère un signal d'entraînement servant à entraîner un élément mobile (22) via un mécanisme (50) d'entraînement. Une unité (41) de réglage de cadence d'images règle une cadence d'images lors de la capture d'une vidéo mouvante d'une scène. Une unité (42) de commande de fréquence d'entraînement commande une fréquence d'entraînement du signal d'entraînement que génère l'unité (60) de génération de signal d'entraînement, en fonction de la cadence d'images qu'a réglée l'unité (41) de réglage de fréquence.
PCT/JP2014/076077 2013-10-24 2014-09-30 Dispositif et procédé de capture de vidéos mouvantes Ceased WO2015060077A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108235121A (zh) * 2018-01-16 2018-06-29 青岛海信电器股份有限公司 一种倍频显示的处理方法及装置、电子设备

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Publication number Priority date Publication date Assignee Title
JPS6382176A (ja) * 1986-09-26 1988-04-12 Canon Inc ビデオカメラ
JPH11177868A (ja) * 1997-12-16 1999-07-02 Canon Inc 撮像方法及び再生方法とその装置
JP2006101452A (ja) * 2004-09-30 2006-04-13 Fuji Photo Film Co Ltd 撮影装置
JP2008193195A (ja) * 2007-02-01 2008-08-21 Nikon Corp ディジタルカメラ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6382176A (ja) * 1986-09-26 1988-04-12 Canon Inc ビデオカメラ
JPH11177868A (ja) * 1997-12-16 1999-07-02 Canon Inc 撮像方法及び再生方法とその装置
JP2006101452A (ja) * 2004-09-30 2006-04-13 Fuji Photo Film Co Ltd 撮影装置
JP2008193195A (ja) * 2007-02-01 2008-08-21 Nikon Corp ディジタルカメラ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108235121A (zh) * 2018-01-16 2018-06-29 青岛海信电器股份有限公司 一种倍频显示的处理方法及装置、电子设备
CN108235121B (zh) * 2018-01-16 2020-07-10 海信视像科技股份有限公司 一种倍频显示的处理方法及装置、电子设备

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