JP2012099885A - Moving image distortion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce distortion generated while a fast moving subject is being zoom-imaged, in an imaging apparatus that is driven by a rolling shutter system and that uses an X-Y address type imaging element represented by a CMOS sensor.SOLUTION: During zoom-imaging, a position of a zoom lens is detected and, when the zooming position is on the telescopic end side, a frequency for driving an imaging element is increased. When the zooming position is on the wide-angle end side, the frequency for driving the imaging element is decreased, power consumption is reduced while distortion is being suppressed.

Description

  The present invention relates to an image pickup apparatus that is driven by a rolling shutter system, and relates to a reduction in distortion of a subject during a moving image.

  In recent years, an XY address type image pickup device represented by a CMOS sensor has started to spread in image pickup apparatuses such as digital cameras and video cameras. This XY address type image sensor can perform high-speed imaging with low power consumption. Compared to a CCD sensor, a CMOS sensor has no CCD transfer portion and has only a drive and a sense wiring. Therefore, there is an advantage that the opening area of the photodiode can be increased, and further spread is expected.

  However, the XY address type image sensor is characterized by rolling reading in units of rows or columns, and the accumulation times of the rows or columns in the frame are different, and a time lag occurs in the accumulation time. This time lag is a demerit that causes subject distortion during moving images.

  An XY address type image pickup device capable of collective reset (global shutter) has also been proposed, but there are problems such as an increase in power consumption, and it is generally applied only when a mechanical shutter is used.

  6 (a), 6 (b), and 6 (c) will be described with respect to problems that occur when an accumulation operation is performed using an XY address image sensor.

  FIG. 6A shows a subject image when the camera is panned to the left while photographing a stationary subject P0 with a camera in a global shutter type imaging device such as a CCD sensor. In the case of the global shutter, since the storage times in the frames are the same, the subject image P0 moves in the horizontal direction by the amount the camera moves to the left, but no distortion is seen in the subject image.

FIG. 6B is a subject image when the same movement as that of the camera of FIG. 6A is performed in a rolling shutter type image sensor represented by an XY address type image sensor. (Hereinafter, it is assumed that the XY address type image pickup device in this specification performs rolling reading in units of rows.)
Unlike the subject image P0 in FIG. 6A, the subject image when the camera is panned to the left is distorted in the horizontal direction as in P1.

  The reason why the distortion in FIG. 6B occurs in FIG. 7 will be described below.

  FIG. 7 is an image reading timing chart of the rolling reading method, in which the horizontal axis indicates time and the vertical axis indicates pixel rows from 0 to N.

  1301 is an electronic shutter for resetting the pixel charge for each line, 1303 is a pixel readout timing for each line, 1305 is an exposure time, and 1307 is a vertical synchronization signal for outputting a pulse for each frame. Since exposure of a line Nt1 of one frame starts at time t1 and exposure of the line Nt2 at time t2, in the case of the rolling shutter system, the exposure time is different for each line in one frame. For this reason, when the angle of view is changed by moving the camera (or the subject moves), the exposure time is different for each line, so that distortion occurs in the image within one frame.

  As described above, since the readout time for each line is different, distortion occurs in the horizontal direction as shown in FIG. When the image sensor is reading in units of columns, the distortion direction of the subject image is distorted in the vertical direction.

  FIG. 6C shows a rolling shutter type image pickup device in which the zoom of the camera is set to the telephoto side (for example, the Tele end) with respect to FIG. 6B, and the camera is moved at the same moving speed as FIGS. A subject image moved to the left.

  It can be seen that the distortion amount of the subject P2 of FIG. 6C is larger than the subject image P1 of FIG. 6B.

  Hereinafter, the reason why the amount of distortion increases as shown in FIG.

  FIG. 8 shows subject movement amounts (m1, m2) when the angle of view of the camera is moved by θ degrees when the subject P1 is placed at a distance d1 and the subject P2 is placed at a distance d2 from the camera placement position.

m1 and m2 are obtained from the following equations,
m1 = 2 × d1 × π × θ / 360
m2 = 2 × d2 × π × θ / 360
If the angle θ is constant, the movement amounts m1 and m2 of the subject increase as the distance from the camera increases.

  That is, when the moving speed of the camera and the change amount θ of the angle of view are constant, the moving distance of the subject increases as the distance from the camera increases, and the relative moving speed viewed from the camera is faster in P2 than in P1. Become. As for the amount of distortion in the rolling shutter, if θ and the moving speed of the camera are constant, the amount of distortion becomes larger in P2 than in P1 when the relative moving speed is fast (the distance from the camera is far) (FIG. 6B). ), FIG. 6 (c)).

  The camera image shoots a subject that is farther from the Tele end than the Wide end, so that rolling distortion is more conspicuous at the Tele end of the zoom position.

JP 2008-263262 A

  Patent Document 1 proposes a technique for reducing subject distortion by keeping the reading speed of one frame constant regardless of the frame rate. However, even if the reading speed is constant, as shown in FIG. 8, the distortion amount becomes conspicuous when the subject is photographed at a high magnification. Therefore, it is necessary to consider the distortion amount according to the zoom position.

  In order to reduce the amount of distortion of a subject, reading is generally performed at a reading speed as fast as possible. However, increasing the drive frequency has many disadvantages, such as increased power loss, increased heat, and decreased signal integrity, and we want to avoid increasing the drive frequency as much as possible.

  The present invention has been made in view of such a problem, and proposes a technique for controlling the reading speed in accordance with the zoom position of the camera and reducing the amount of distortion.

  In order to solve the above problems, an imaging apparatus of the present invention has the following configuration.

In order to achieve the above object, the present invention described in claim 1
Imaging means for taking a subject image and converting it into a video signal;
Imaging drive control means for controlling driving of the imaging means;
Imaging frequency control means for controlling the drive frequency of the imaging drive control means;
Optical means for condensing an optical image on the imaging means;
Optical control means for controlling the zoom position of the optical means;
Optical position detection means for detecting the position of the optical means;
Recording means for recording the video signal obtained through the imaging means on a recording medium;
Have
The optical position detection means detects the zoom position of the optical means, and controls the drive frequency control means so as to obtain an imaging drive frequency corresponding to the zoom position of the optical means.

In order to achieve the above object, the present invention according to claim 2
Imaging means for taking a subject image and converting it into a video signal;
Imaging drive control means for controlling driving of the imaging means;
Imaging frequency control means for controlling the drive frequency of the imaging drive control means;
Optical means for condensing an optical image on the imaging means;
Optical control means for controlling the zoom position of the optical means;
Optical position detection means for detecting the position of the optical means;
Recording means for recording the video signal obtained through the imaging means on a recording medium;
Electronic scaling processing means for cutting out a partial range of a video signal acquired via the imaging means or a video signal read out from the recording medium, and performing signal processing to generate a video signal indicating the video content of the partial range When,
Have
The optical position detection means detects the zoom position of the optical means or the magnification change ratio of the electronic scaling processing means, and the image pickup corresponds to the zoom position of the optical means or the magnification change ratio of the electronic scaling processing means. The drive frequency control means is controlled to achieve a drive frequency.

  According to the present invention, the imaging drive frequency is controlled according to the zoom position. When the zoom position is on the Wide side, the imaging drive frequency is lowered, and when the zoom position is on the Tele side, the imaging drive frequency is increased. Thereby, rolling distortion can be reduced without always increasing the imaging drive frequency.

Overall configuration block diagram of an embodiment to which the present invention can be applied Flowchart of main routine of imaging apparatus to which the present invention can be applied Flowchart of shooting mode in an embodiment to which the present invention can be applied FIG. 6 is a diagram of the relationship between the imaging drive frequency with respect to the optical zoom and electronic zoom positions in an embodiment to which the present invention can be applied. FIG. 6 is a diagram of the relationship between the imaging drive frequency with respect to the optical zoom and electronic zoom positions in an embodiment to which the present invention can be applied. FIG. 6 is a diagram of the relationship between the imaging drive frequency with respect to the optical zoom and electronic zoom positions in an embodiment to which the present invention can be applied. FIG. 6 is a diagram of the relationship between the imaging drive frequency with respect to the optical zoom and electronic zoom positions in an embodiment to which the present invention can be applied. Cutout image of electronic zoom in an embodiment to which the present invention can be applied Subject image to which the present invention can be applied Subject image to which the present invention can be applied Subject image to which the present invention can be applied Rolling shutter read timing chart to which the present invention can be applied Subject movement amount with respect to a camera to which the present invention can be applied

Hereinafter, embodiments of the present invention will be described with reference to the drawings. <Embodiment>
FIG. 1 is a diagram illustrating a configuration of an imaging apparatus according to the present invention.

  In FIG. 1, 100 is an overall view of the imaging apparatus.

  Reference numeral 12 denotes a shutter for controlling the amount of exposure to the image sensor 14, and reference numeral 14 denotes an image sensor that converts an optical image into an electrical signal.

  Reference numeral 310 denotes a photographing lens, and 312 denotes an aperture.

  The light beam incident on the lens 310 can be guided through the aperture 312 and the shutter 12 and can be formed on the image sensor 14 as an optical image. The image sensor 14 is a solid-state image sensor such as a CCD or CMOS.

  Reference numeral 16 denotes a CDS circuit that samples and holds a signal from the image sensor 14 (hereinafter referred to as S / H) and performs correlated double sampling. Reference numeral 17 denotes an A / D converter that converts an analog signal output from the CDS circuit 16 into a digital signal.

  Reference numeral 18 denotes a timing generation circuit, and 26 denotes a D / A converter. The timing generation circuit 18 sends a clock signal and a control signal to the image sensor 14, the CDS circuit 16, the A / D conversion unit 17, and the D / A converter 26. It is a timing generation circuit to supply.

  Reference numeral 20 denotes an image processing circuit, and 22 denotes a memory control circuit. The image processing circuit 20 performs predetermined pixel interpolation processing and color conversion processing on the data from the A / D converter 17 or the data from the memory control circuit 22. Do.

  Reference numeral 24 denotes an image display memory, and 28 denotes an image display unit composed of a TFT LCD or the like. Display image data written in the image display memory 24 is displayed by the image display unit 28 via the D / A converter 26. .

  An electronic zoom circuit 27 sends image data from the image processing circuit 20 to the electronic zoom circuit 27 as necessary. The electronic zoom circuit 27 is a processing unit that performs enlargement / reduction processing of an input image, and the image subjected to enlargement / reduction processing is stored in the memory 22 via the image processing circuit 28.

  Reference numeral 30 denotes a memory for storing captured still images and moving images, and has a sufficient storage capacity to store a predetermined number of still images and a predetermined time of moving images.

  A compression / decompression circuit 32 compresses and decompresses image data by adaptive discrete cosine transform (ADCT) or the like. The image stored in the memory 30 is read, compression processing or decompression processing is performed, and the processed data is written in the memory 30.

  The memory control circuit 22 controls the A / D conversion unit 17, the timing generation circuit 18, the image processing circuit 20, the image display memory 24, the D / A converter 26, the memory 30, and the compression / decompression circuit 32.

  Reference numeral 50 denotes a system control circuit that controls the entire imaging apparatus 100. The timing generation circuit 18 is controlled in frequency and generation timing by the memory control circuit 22 and the system control circuit 50.

  Reference numeral 40 denotes shutter control means for controlling the shutter 12, and reference numeral 42 denotes distance measurement means for performing AF (autofocus) processing. The in-focus state of the image formed as an optical image can be measured by causing the light beam incident on the lens 310 to enter the distance measuring unit 42 via the aperture 312 and the distance measuring sub mirror (not shown). .

  Reference numeral 46 denotes photometric means for performing AE (automatic exposure) processing. A light beam incident on the lens 310 is made incident on the photometric means 46 through the aperture 312 and a photometric lens (not shown), thereby obtaining an optical image. As a result, the exposure state of the image formed can be measured.

  Reference numeral 340 denotes an aperture control unit that controls the aperture 312 in cooperation with the shutter control unit 40 that controls the shutter 12 based on photometric information from the photometry unit 46. The exposure unit controls the shutter 12 in cooperation with the aperture control unit 340 that controls the aperture 312 based on photometric information from the photometry unit 46.

  A memory 52 stores constants, variables, programs, and the like for operating the system control circuit 50.

  Reference numeral 342 denotes a distance measurement control unit that controls the focusing of the photographic lens 310, 344 denotes a zoom control unit that controls zooming of the photographic lens 310, and the system control circuit 50 acquires the zoom position via the zoom control unit 344. Is possible.

  A lens system control circuit 350 controls the entire lens unit that controls the aperture, distance measurement, and zoom.

  Reference numeral 300 denotes a lens unit constituting a unit such as a lens 310 and a diaphragm 312.

  The lens system control circuit 350 includes a memory for storing operation constants, variables, programs and the like, identification information such as a number unique to the lens unit 300, management information, function information such as an open aperture value, a minimum aperture value, a focal length, It also has a non-volatile memory function for holding current and past set values.

  Reference numeral 120 denotes an interface for connecting the imaging device 100 to the lens unit 300, and 122 and 322 are connectors for electrically connecting the imaging device 100 to the lens unit 300.

  Reference numeral 72 denotes a power switch that can switch and set the power-on and power-off modes of the imaging apparatus 100.

  Reference numeral 80 denotes power supply control means, which includes a battery detection circuit, a DC-DC converter, a switch circuit for switching a block to be energized, and the like. The presence / absence of the 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 control circuit 50, and the necessary voltage is included for the necessary period. Supply to each part.

  Reference numeral 82 denotes a connector, 84 denotes a connector, and 86 denotes 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, an AC adapter, or the like.

  90 is an interface with a recording medium such as a memory card or hard disk, 92 is a connector for connecting to a recording medium such as a memory card or hard disk, and 200 is a recording medium such as a memory card or hard disk.

  Reference numeral 98 denotes recording medium attachment / detachment detection means for detecting whether or not the recording medium 200 is attached to the connector 92.

  The recording medium 200 is composed of a semiconductor memory, a magnetic disk, or the like.

  Reference numeral 56 denotes an electrically erasable / recordable nonvolatile memory such as an EEPROM.

  Reference numeral 60 denotes a mode dial switch, which is a mode changeover switch for distinguishing between starting of the normal still image shooting mode and the moving image shooting mode.

  Reference numeral 62 denotes a shutter switch SW1, which is turned on during the operation of a shutter button (not shown), and performs AF (autofocus) processing, AE (automatic exposure) processing, AWB (auto white balance) processing, EF (flash dimming) processing, and the like. Instruct to start operation.

  Reference numeral 64 denotes a shutter switch SW2, which is turned on when an operation of a shutter button (not shown) is completed. If the off state is maintained depending on the state of the moving image 1 mode switch 60, the operation shifts to a still image shooting operation. If it is held, the process moves to a moving image shooting operation.

  Reference numeral 66 denotes a playback switch, which instructs the start of a playback operation in which a captured image is read from the memory 30 or the recording medium 200 and displayed by the image display unit 28 in the shooting mode state.

  Reference numeral 70 denotes an operation unit including various buttons, a touch panel, and the like, and performs various settings.

<Description of Operation of Imaging Device 100>
FIG. 2 shows a flowchart of a main routine of the imaging apparatus 100 in the present embodiment.

  Upon power-on such as battery replacement, the system control circuit 50 initializes flags, control variables, and the like, and performs initialization processing for each part of the imaging apparatus 100 (S101).

  The system control circuit 50 determines the setting position of the power switch 72, and if the power switch 72 is set to power OFF (S102), the display on each display unit is changed to the end state. Then, necessary parameters, setting values, and setting modes including flags and control variables are recorded in the nonvolatile memory 56. After performing a predetermined end process such as shutting off unnecessary power of each part of the imaging apparatus 100 including the image display unit 28 by the power supply control unit 80 (S103), the process returns to S102.

  If the power switch 72 is set to ON (S102), the process proceeds to S104.

  The system control circuit 50 determines whether there is a problem in the operation of the imaging apparatus 100 due to the remaining capacity and operation status of the power supply 86 configured by a battery or the like by the power supply control means 80 (S104). If there is a problem, the display unit 54 and / or the image display unit 28 is used to display a predetermined warning by an image or sound (S105), and the process returns to S102.

  If there is no problem with the power supply 86 (S104), the process proceeds to S106.

  The system control circuit 50 uses the display unit 54 to display various setting states of the imaging apparatus 100 using images and sounds. If the image display of the image display unit 28 is ON, the image display unit 28 is also used to display various setting states of the imaging apparatus 100 using images and sounds (S106).

  The system control circuit 50 determines the setting position of the mode dial 60. If the mode dial 60 is not set to the shooting mode (S108), the process proceeds to S110.

  If the mode dial 60 is set to the shooting mode (S108), the system control circuit 50 executes the shooting mode (S109), and returns to S102 when the process is completed.

  Details of the shooting mode (S109) will be described later with reference to FIG.

  The system control circuit 50 determines the set position of the mode dial 60, and if the mode dial 72 is not set to the reproduction mode (S110), the process returns to S102.

  If the mode dial 60 is set to the reproduction mode (S110), the reproduction mode process is executed (S111), and if the process is completed, the process returns to S102.

  As described above, the user of the imaging apparatus 100 can carry the imaging apparatus 100 and perform shooting and reproduction at any time.

  FIG. 3 shows a detailed flowchart of the shooting mode in S109 of FIG.

  The system control circuit 50 acquires the zoom position from the zoom control means 344 (S501), and proceeds to S502.

  In S502, it is determined whether the zoom position obtained in S501 is within the range of Z1, and if it is within the range, the process proceeds to S503, and if it is out of the range, the process proceeds to S504.

  Here, the relationship between the zoom position and Z1 to Z3 will be described with reference to FIG.

  FIG. 4A shows the relationship of the imaging drive frequency to the optical zoom and electronic zoom positions, with the horizontal axis representing the zoom position and the vertical axis representing the imaging drive frequency.

  When the zoom position is in the Z1 range on the Wide side, the imaging drive frequency is f1 [Hz]. When the zoom position is in the Z2 range on the Tele side, the imaging drive frequency is f2 [Hz], and the zoom position is Z3 in the electronic zoom area. If it is within the range, the imaging drive frequency is set to f3 [Hz] (f2 = f3 in FIG. 4A). Here, in FIG. 4A, hysteresis is not provided at the frequency switching position between Z1 and Z2 and between Z2 and Z3, but a configuration in which hysteresis is provided is also possible. In FIG. 4A, the switching position between Z1 and Z2 is not particularly specified, but the switching position can be arbitrarily set.

  For example, the switching position of Z1 and Z2 is set to an intermediate position in the optical zoom operating range, the imaging drive frequency is f1 = 30 MHz, f2 = 60 MHz (f1 = 1 / f2), and f3 = f2 = 60 MHz during electronic zoom. It may be operated. In the case of the Wide end side where the influence of the distortion amount is not conspicuous, the drive frequency can be made lower than f2, so when f1 = 30 MHz and f2 = 60 MHz, the Wide side has the imaging drive frequency out of the total power. Dependence can be reduced to half.

  Returning to the description of FIG. 3, if it is determined in S502 that it is within the range of Z1, the process proceeds to S503, the imaging drive frequency is set to f1 [Hz] corresponding to Z1, and the process proceeds to S507.

  If it is determined in S502 that the zoom position is outside the range of Z1, the process proceeds to S504, and it is determined whether the zoom position obtained in S501 is in the range of Z2. If it is within the range of Z2, the process proceeds to S505, and if it is out of the range, the process proceeds to S506.

  When the process proceeds to S505 within the range of Z2, the imaging drive frequency is set to f2 [Hz] corresponding to Z2, and the process proceeds to S507.

  If it is determined in S504 that it is out of the range of Z2, the process proceeds to S506, and it is determined from FIG. The imaging drive frequency is set to f3 [Hz], and the process proceeds to S507.

  In S507, an imaging system driving parameter corresponding to the imaging driving frequency set in S503, S505, or S506 is set, the imaging element 14 is driven at a frequency corresponding to the zoom position, and a through image display is performed (S508). , The process returns to S501.

  Here, in FIG. 4A, at the time of electronic zoom with a zoom magnification higher than that of the optical zoom, the same frequency f3 [Hz] as the imaging drive frequency f2 [Hz] in the zoom range Z2 (f2 = f3 in FIG. 4A). The reason why it can be driven will be described.

  FIG. 5 shows an image (1280 × 960) at the Tele end where a distorted image is recorded and a cut-out image (640 × 480) at the time of electronic zoom. Since clipping is performed on the image at the Tele end, the distortion amount of the image at the time of clipping is the same as the distortion amount at the Tele end. Therefore, at the time of electronic zoom, the same drive frequency as the Tele end is sufficient without increasing the drive frequency.

  When the electronic zoom is at a high magnification, it is assumed that it is difficult to recognize the amount of distortion because the subject image moves greatly when the camera is slightly shaken. In that case, the drive frequency at the time of electronic zoom may be set to a frequency lower than f2 instead of f2 [Hz].

  In this proposal, the zoom range (Z1 to Z3) and the imaging drive frequency (f1 to f3) as shown in FIG. 4A are used. However, even if the zoom position and the imaging drive frequency are further divided and controlled. I do not care. For example, seamless frequency control as shown in FIG. Further, a configuration as shown in FIGS. 4C and 4D is also possible. In FIG. 4C, there is Z0 between the zoom ranges Z1 and Z2, and in the region of Z0, the imaging drive frequency increases from f1 to f2 as the optical zoom moves from the Wide side to the Tele side. In FIG. 4D, there is Z0 between the zoom ranges Z1 and Z2, and in the region of Z0, the imaging drive frequency is a frequency f0 [Hz] between f1 and f2.

  If there is a plurality of optical zoom frequency switching positions and the imaging drive frequency becomes f1 <= f0 <= f2 as the optical zoom moves from the Wide end to the Tele end, the imaging drive frequency switching zoom position is not limited. Absent. The frequency switching position and f0 are not limited to one point, and a plurality of positions can be provided.

  As mentioned above, although this invention was explained in full detail based on embodiment, this invention is not limited to these specific embodiment, Various forms of the range which does not deviate from the summary of this invention are also contained in this invention. According to the present invention, the imaging drive frequency is controlled according to the zoom position. When the zoom position is on the Wide side, the imaging drive frequency is lowered, and when the zoom position is on the Tele side, the imaging drive frequency is increased. Thereby, rolling distortion can be reduced without always increasing the imaging drive frequency.

12: Shutter 14: Image sensor 17: A / D converter 18: Timing generation circuit 20: Image processing circuit 22: Memory control circuit 24: Image display memory 26: D / A converter 27: Electronic zoom circuit 28: Image display Unit 30: Memory 32: Image compression / expansion circuit 40: Exposure control means 42: Distance measurement control means 46: Photometry means 50: System control circuit 52: Memory 56: Non-volatile memory 60: Mode dial switch 62: Shutter switch SW1
64: Shutter switch SW2
66: Playback switch 70: Operation unit 72: Power switch (main switch)
80: power supply control means 82: connector 84: connector 86: power supply means 90: interface 92: connector 100: imaging device 200: recording medium

Claims (5)

Imaging means for taking a subject image and converting it into a video signal;
Imaging drive control means for controlling driving of the imaging means;
Imaging frequency control means for controlling the drive frequency of the imaging drive control means;
Optical means for condensing an optical image on the imaging means;
Optical control means for controlling the zoom position of the optical means;
Optical position detection means for detecting the position of the optical means;
Recording means for recording the video signal obtained through the imaging means on a recording medium;
Have
An image pickup apparatus, wherein the optical position detection means detects a zoom position of the optical means, and controls the drive frequency control means so as to obtain an image pickup drive frequency corresponding to the zoom position of the optical means. Imaging means for taking a subject image and converting it into a video signal;
Imaging drive control means for controlling driving of the imaging means;
Imaging frequency control means for controlling the drive frequency of the imaging drive control means;
Optical means for condensing an optical image on the imaging means;
Optical control means for controlling the zoom position of the optical means;
Optical position detection means for detecting the position of the optical means;
Recording means for recording the video signal obtained through the imaging means on a recording medium;
Electronic scaling processing means for cutting out a partial range of a video signal acquired via the imaging means or a video signal read out from the recording medium, and performing signal processing to generate a video signal indicating the video content of the partial range When,
Have
The optical position detection means detects the zoom position of the optical means or the operation of the electronic scaling processing means, and the imaging drive frequency corresponding to the zoom position of the optical means or the operation of the electronic scaling processing means An image pickup apparatus that controls the drive frequency control means so that When the optical position detection means detects the zoom position of the optical means, and the zoom position is at the wide-angle end or the wide-angle end side with respect to an arbitrary zoom position,
The imaging frequency control means drives the imaging means at a frequency that does not change or lowers as it moves from an arbitrary zoom position to the wide-angle end in a selectable frequency range. The imaging apparatus according to 1. When the optical position detection means detects the zoom position of the optical means, and the zoom position is at the telephoto end or at the telephoto end side with respect to an arbitrary zoom position,
The imaging frequency control means drives the imaging means at a frequency that does not change or is higher as it moves from an arbitrary zoom position to a telephoto end side within a selectable frequency range. The imaging apparatus according to 1. According to the magnification or image size of the image generated by the electronic scaling processing means,
The imaging apparatus according to claim 2, wherein the imaging unit is driven at a frequency that is the same as or different from the imaging drive frequency.