JP2011239313A - Imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging apparatus that can obtain an image effect for changing a magnification at a constant speed even when an optical magnification is changed manually.SOLUTION: An imaging apparatus comprises: optical magnification change means that can change a magnification by a manual operation; electronic magnification change means that can electronically change the magnification by processing image signals obtained by an image pickup device; optical magnification change speed detection means (S102) for detecting an optical magnification change speed of the optical magnification change means; integrated magnification change speed setting means (S103) for setting an integrated magnification change speed by unifying the optical magnification change speed detected by the optical magnification change speed detection means and an electronic magnification change speed by the electronic magnification change means; and integrated magnification change speed correction means (S104) for correcting the electronic magnification change speed so that the integrated magnification change speed becomes constant even if the optical magnification change speed is changed.

Description

  The present invention relates to an imaging apparatus including an optical zoom and an electronic zoom.

  2. Description of the Related Art In recent years, a large number of image pickup apparatuses that record an image as data using an image pickup device such as a CCD (charge coupled device) such as a digital camera or a digital video camera have been put on the market. In a digital camera, a data image is recorded in a large-capacity recording unit such as a semiconductor memory card, and can be written and erased any number of times. In general, a digital camera is equipped with a liquid crystal display unit that can display captured images as needed and a removable large-capacity recording unit. The liquid crystal display unit built in the digital camera uses a dot matrix liquid crystal, and can display a high-definition image.

  When a digital camera provided with the liquid crystal display unit and the large-capacity recording unit is used, a photographed image can be displayed on the liquid crystal display unit and immediately confirmed on the spot. Therefore, image data that cannot be satisfied can be erased on the spot, or re-photographed as necessary, even in the field of photography. Compared with silver salt photography using film, the efficiency of photography is improved. It can be said that it has increased dramatically.

  Due to the above-described convenience and technological innovations such as an increase in the number of pixels of the image sensor, the range of use of digital cameras has been expanded. In recent years, there are an increasing number of digital cameras capable of exchanging lenses such as single-lens reflex cameras. Furthermore, recent digital cameras are compatible not only with still image shooting but also with moving image shooting, and their convenience is further enhanced. Many digital cameras having such an image sensor have an electronic zoom function that cuts out and enlarges an image formed on the image sensor. On the other hand, many cameras drive a zoom lens in an imaging lens group to enable optical zoom. The driving of an optical zoom lens is generally controlled electrically, but in many single-lens reflex cameras, the lens is driven manually.

  A technique using both electronic zoom and optical zoom is disclosed in Patent Document 1 and the like. For example, in a steep range of the optical zoom ratio with respect to the lens movement amount, the change of the zoom ratio due to the optical zoom is reduced and the zoom of the electronic zoom is changed, and the optical zoom is combined with the zoom ratio of the electronic zoom. The change rate is controlled to be constant. By using this technique, a video effect of zooming at a constant speed can be obtained. The function of zooming at a constant speed is highly convenient as a video effect when shooting a moving image.

JP-A-6-350891

  However, the above conventional example is based on the premise that the optical zoom is electrically controlled, and the configuration cannot be achieved with a camera that performs optical zoom manually. Since the optically controlled optical zoom has a known zooming speed of the optical zoom ratio, the zooming speed can be corrected by incorporating predetermined electronic zoom control. However, the manually operated optical zoom cannot know the zooming speed in advance, and the zooming speed cannot be corrected only by the electronic zoom control incorporated in advance.

(Object of invention)
An object of the present invention is to provide an imaging apparatus capable of obtaining an image effect of scaling at a constant speed even when optical scaling is performed manually.

  In order to achieve the above object, an imaging apparatus according to the present invention includes an optical scaling unit capable of scaling by manual operation, and an electronic scaleable electronic device by processing an image signal obtained by the imaging element. Based on the optical scaling speed detected by the optical scaling speed detecting means, the optical scaling speed detecting means for detecting the optical scaling speed of the optical scaling means, and the optical scaling speed detected by the optical scaling speed detecting means. A total zoom speed setting means for setting a total zoom speed combining the zoom speed and the electronic zoom speed by the electronic zoom means; and the total zoom speed is constant even if the optical zoom speed changes. And an overall zoom speed correcting means for correcting the electronic zoom speed.

  According to the present invention, it is possible to obtain an image effect of scaling at a constant speed even when optical scaling is performed manually.

It is a block diagram which shows the digital camera circuit structure based on one Example of this invention. It is an external appearance perspective view which shows the lens unit concerning one Example. It is a figure for demonstrating total zoom speed correction | amendment with an optical zoom and an electronic zoom. It is a flowchart which shows the operation | movement at the time of the comprehensive zooming speed correction which concerns on one Example.

  The mode for carrying out the present invention is as shown in the following examples.

  FIG. 1 is a block diagram showing a circuit configuration example of an interchangeable lens digital camera which is an image pickup apparatus according to an embodiment of the present invention.

  In FIG. 1, a photographic lens 100 is detachably attached to the camera body 200 via a mount portion described later having an electrical contact group 107. Then, communication is performed between the camera body 200 and the photographing lens 100, and the lens group 101 and the diaphragm 102 in the photographing lens 100 are driven. The photographing lens 100 is provided with a zoom detection unit 108, which detects a change in the speed of the zoom ring that is manually operated, and the detection result will be described later of the camera body 200 via the electrical contact group 107. It is communicated to the system controller 223. A battery unit 300 is detachably attached to the camera body 200 via an attachment / detachment mechanism (not shown), and power is supplied and communicated between the camera body 200 and the battery unit 300 via a power contact 302.

  An imaging light beam from a subject (not shown) is guided to the quick return mirror 202 through the lens group 101 and the diaphragm 102 for adjusting the light amount. The central portion of the quick return mirror 202 is a half mirror, and a part of the light beam is transmitted when the quick return mirror 202 is down (the state of FIG. 1 entering the photographing optical path). The transmitted light beam is reflected by the sub mirror 203 installed on the quick return mirror 202 and guided to the AF sensor 204. On the other hand, the photographing light beam reflected by the quick return mirror 202 forms an image on the focus plate 225. The subject image formed on the focus plate 225 is provided to the eyes of the photographer via the pentaprism 201 and the eyepiece lens 206.

  Further, when the quick return mirror 202 is raised (in a state where the quick return mirror 202 is retracted from the photographing optical path), the light flux from the lens group 101 is an image sensor that is an image sensor via a focal plane shutter 208 that is a mechanical shutter and a filter 209. Reach 210. The sub mirror 203 is folded when the quick return mirror 202 is up. The filter 209 has two functions, one is a function that cuts infrared rays and guides only visible light to the image sensor 210, and the other is a function as an optical low-pass filter. The focal plane shutter 208 has a front curtain and a rear curtain, and transmits and blocks the light beam from the lens group 101.

  The camera body 200 includes a system controller 223 that includes a CPU that controls the entire digital camera. The system controller 223 includes a lens control unit 104 that controls the lens driving unit 103 that performs focusing by moving a part of the lens group 101 in the optical axis direction, and a diaphragm driving unit 105 that drives the diaphragm 102. An aperture control unit 106 that performs control is connected. Further, a shutter charge / mirror drive unit 211 for controlling the up / down driving of the quick return mirror 202 and the shutter charge of the focal plane shutter 208 is connected. Further, a shutter control unit 212 for controlling the travel of the front and rear curtains of the focal plane shutter 208 and a photometric unit 207 connected to a photometric sensor disposed in the vicinity of the eyepiece lens 206 are connected. Further, an EEPROM 222 that stores parameters that need to be adjusted in order to control the digital camera, a DC / DC converter 224 that supplies power to each circuit and driver of the digital camera are connected.

  The system controller 223 and the photographic lens 100 communicate with each other via the electronic contact group 107, whereby the photographic lens 100 is determined.

  The photometric sensor is a sensor for measuring the luminance of a subject (not shown), and its output is supplied to the system controller 223 via the photometric unit 207. Further, the system controller 223 controls the lens driving unit 103 via the lens control unit 104 to form a subject image on the image sensor 210. Further, the system controller 223 controls the aperture 102 via the aperture control unit 106 and the aperture drive unit 105 based on the set aperture value, and further controls the shutter control unit 212 based on the set shutter speed value. Output a signal.

  The drive source of the front and rear curtains of the focal plane shutter 208 is a spring, and after the shutter travels, a spring charge is required for the next operation. The shutter charge / mirror drive unit 211 controls the spring charge. Further, the click return mirror 202 is raised and lowered by the shutter charge / mirror drive unit 211.

  An image data controller 220 is further connected to the system controller 223. The image data controller 220 is correction data sampling means and correction means constituted by a DSP (digital signal processor). Then, control of the image sensor 210 and correction and processing of image data input from the image sensor 210 are executed based on a command from the system controller 223.

  The image data controller 220 is connected to a timing pulse generator 217 that outputs a pulse signal necessary for driving the image sensor 210. Further, an AGC 233 is connected to receive the timing pulse generated by the timing pulse generator 217 together with the image sensor 210 and adjust the gain of the analog signal corresponding to the subject image output from the image sensor 210. Furthermore, an A / D converter 216 for converting an analog signal whose gain has been adjusted to a digital signal, a DRAM 221 for temporarily storing the obtained image data (digital data), a D / A converter 215, and image compression Unit 219 is connected. The DRAM 221 is used as a storage means for temporarily storing image data before processing or data conversion into a predetermined format.

  The photometry unit 207 performs photometry, the system controller 223 determines the exposure value, and the shutter speed value calculated based on the exposure value is equal to or less than a predetermined value (1 / lens focal length). To do. In this case, the gain can be increased by the AGC 233 so as to be a predetermined value (1 / lens focal length) or more. Further, the image display unit 213 is connected to the D / A converter 215 via the encoder unit 214.

  An image data recording medium 218 is connected to the image compression unit 219. The system controller 223 can set the image format and compression rate by sending a signal to the image compression unit 219 via the image data controller 220. Here, the image is compressed to such an extent that the image quality is sufficient to distinguish the in-focus position and the capacity does not become larger than necessary. Generally, a camera can store images in both RAW format and JPEG format, and in the case of JPEG format, the compression rate can be selected from three levels of high, medium, and low.

  The image display unit 213 is for displaying image data picked up by the image sensor 210. The image display unit 213 is configured to appropriately display an image on a rear liquid crystal display unit 236 provided on the rear surface of the digital camera based on a signal from the system controller 223.

  The image data controller 220 converts the image data on the DRAM 221 into an analog signal by the D / A converter 215 and outputs the analog signal to the encoder unit 214. The encoder unit 214 converts the output of the D / A converter 215 into a video signal (for example, an NTSC signal) necessary for driving the image display unit 213. The image compression circuit 219 is for performing compression and conversion (for example, JPEG) of image data stored in the DRAM 221. The converted image data is stored in the image data recording medium 218. As the recording medium, a hard disk, a flash memory (registered trademark), a floppy (registered trademark) disk, or the like is used.

  The system controller 223 is further connected with a power switch (SW) 234 for switching the power of the digital camera on and off. Further, a switch 231 (switch SW1) for starting photographing preparation operations such as photometry and distance measurement and a release switch 232 (switch SW2) for starting photographing operations are connected. Further, a mode setting switch 230 for setting a mode for causing the digital camera to execute a desired operation by the user and a selection switch 229 for selecting a desired one from various selection parameters are connected. Further, a determination switch 228 for determining the selected parameter and an electronic dial switch 227 for displaying the parameter up and down by rotating operation are connected. Further, a strobe 237 having an AF auxiliary light projecting function and a strobe dimming function is connected.

  A dummy load 235 having a predetermined resistance value is connected to the DC / DC converter 224. The DC / DC converter 224 causes a current to flow through the dummy load 235 at a predetermined current value, and detects the voltage drop of the battery voltage at this time, thereby detecting the voltage value of the battery. The DC / DC converter 224 is connected to the battery main body 301 via the power contact 302, and the DC / DC converter 224 is supplied with power from the battery main body 301. That is, power is supplied between the camera body 200 and the battery unit 300 through the power contact 302 as described above.

  FIG. 2 is an external view showing the taking lens 100 shown in FIG.

  The lens case 111 of the photographing lens 100 is provided with the lens group 101, the zoom ring 112, and the mount portion 114 for the camera. The zoom ring 112 is configured to be rotatable with respect to the lens casing 111. The rotation of the zoom ring 112 and the driving of the zoom lens in the lens group 101 are interlocked. By the rotation of the zoom ring 112, the zoom lens in the lens group 101 moves in the optical axis direction. It is configured to perform zooming.

  Between the zoom ring 112 and the lens housing 114, a zoom detection unit 108 that detects the rotation of the zoom ring 112 is disposed. The zoom detection unit 108 is configured by an existing phase detection technology, and a phase brush (not shown) arranged on the zoom ring 112 travels on a phase circuit in which a pattern is arranged for every predetermined section, thereby the zoom detection unit 108. The rotational speed of the ring 112 is detected.

  As described above with reference to FIG. 1, the mount unit 114 includes the electrical contact group 107 and is configured to perform communication between the camera body 200 and the photographing lens 100. Inside the lens housing 111, a lens driving unit 103 for moving the focus lens of the lens group 101 in the optical axis direction to perform focusing, and a lens control unit 104 for controlling the lens driving unit 103 are arranged. Yes. Further, inside the lens housing 111, there are disposed a diaphragm 102, a diaphragm driving unit 105 for driving the diaphragm 102, and a diaphragm control unit 106 for controlling the diaphragm driving unit 105.

  FIGS. 3A and 3B are diagrams for explaining the overall zooming speed control of the optical zoom and the electronic zoom according to the embodiment of the present invention.

  FIG. 3A is a diagram for explaining control for bringing the total zoom speed of the optical zoom and the electronic zoom close to a predetermined zoom speed. The total zooming speed becomes a constant zooming speed by performing control to approach a predetermined zooming speed. In FIG. 3A, the horizontal axis is time, and the vertical axis is the scaling factor. The zooming curve of the optical zoom is indicated by a broken line 402, the scaling curve of the electronic zoom is indicated by a two-dot chain line 403, and the scaling factor of the overall scaling factor. Are indicated by solid lines 401 respectively.

  The change in the speed of the zoom ring 112 is a behavior that accelerates from the start of the operation and decelerates toward the end of the operation in consideration of manual operation. Since the speed change of the zoom ring 112 corresponds to the zoom speed of the optical zoom, the change of the zoom speed of the optical zoom is as shown by a broken line 402. The inclination of the broken line 402 indicating the zooming curve of the optical zoom is not constant because the operation of the zoom ring 112 changes for each user or for each operation situation. The electronic zoom is controlled so as to correct the zooming speed of the optical zoom described above.

  The system controller 223 calculates the zoom speed of the electronic zoom from the zoom speed of the optical zoom detected by the zoom detector 108 so that the total zoom speed of the optical zoom and the electronic zoom is constant. As indicated by a two-dot chain line 403, the electronic zoom is controlled to the tele (telephoto) side from the reference magnification A0 in a region where the zooming speed of the optical zoom is accelerated, and is used as a reference in a region where the zooming speed of the optical zoom is reduced. It is controlled to the wide (wide angle) side from the magnification A0. The curve of the overall zoom speed that is a constant speed is as indicated by the solid line 401. In order to calculate the zooming speed of the electronic zoom, multiple model zooming speeds are set, and based on the detected initial zooming speed of the optical zoom, the zooming speed that can be corrected is predicted. Select and set the speed from the overall scaling speed of the model. This selection is based on the calculated zoom speed based on the calculated zoom speed based on the initial speed and acceleration of the optical zoom and the magnification range (A1 to A2) of the electronic zoom used for correction. The approximate total zoom speed in the model is selected from the zoom speeds of the model.

  Here, the initial position of the electronic zoom is a position offset to the tele side by a predetermined amount so that it can be controlled from the initial stage of zooming to the wide side. For convenience, this is referred to as a reference magnification A0. On the other hand, the upper limit magnification of the electronic zoom for correcting the zooming speed of the optical zoom is A1, and the lower limit magnification is A2. The electronic zoom uses magnifications from A1 to A2, and corrects the zooming speed of the optical zoom. FIG. 3B shows the use area of the image pickup element by the electronic zoom of A0, A1, and A2.

  As described above, setting the upper limit of the magnification of the electronic zoom to be used has an effect of preventing the captured moving image from being unintentionally deteriorated by correcting the zooming speed.

  Next, the operation at the time of the overall zooming speed control of the optical zoom and the electronic zoom, that is, the zooming speed correction according to the embodiment of the present invention will be described with reference to the flowchart of FIG.

  When manual zooming is started in step S101, the system controller 223 detects the optical zooming speed in the next step S102. As described above, the optical zooming speed is detected by detecting the rotation speed of the zoom ring 112 by the zoom detector 108. When the optical zoom speed is detected, the process proceeds to step S103, where the overall zoom speed V0 is set. As described above, the setting of the total zoom speed V0 can be corrected from a plurality of total zoom speeds that are models prepared based on the zoom speed of the optical zoom detected in step S102. This is done by selecting and setting the predicted overall zoom rate.

  In the next step S104, the system controller 223 starts the correction of the overall zooming speed because the overall zooming speed has been set in the above step S103. As described with reference to FIG. 3, the correction of the overall zoom speed is performed (corrected) by the image data controller 220 so that the overall zoom speed of the optical zoom and the electronic zoom is constant. It is done by doing. Specifically, the electronic zoom is controlled by the image data controller 220 changing the reading area of the image sensor 210. By controlling the change speed of this area based on an instruction from the system controller 223, the electronic zoom can be changed. Double speed is controlled.

  In the next step S105, the system controller 223 determines whether or not the upper limit A1 of the electronic zoom correction use magnification has been reached, and the electronic zoom correction use magnification has not reached the upper limit A1 (electronic zoom <A1). In this case, the process proceeds to step S106. On the other hand, if the correction use magnification of the electronic zoom has reached the upper limit A1 in step S105, the actual zoom speed of the optical zoom is higher than the zoom speed of the optical zoom predicted when the total zoom speed V0 is set. Since it is late, the process proceeds to step S121. Then, in step S121, a new total zoom speed V1 is newly set from the total zoom speeds serving as models, and the process proceeds to step S106. If the actual zoom speed of the optical zoom is slower than the predicted zoom speed of the optical zoom, correction is performed using the electronic zoom correction magnification up to the upper limit magnification A1 in order to incorporate the total zoom speed into V0. . For this reason, it is necessary to set a new total variable magnification V1. At this time, the relationship is V0> V1.

  In the next step S106, the system controller 223 determines whether or not the electronic zoom correction use magnification has reached the lower limit A2, and the electronic zoom correction use magnification has not reached the lower limit A2 (electronic zoom> A2). If determined, the process proceeds to step S107. On the other hand, it is determined that the correction use magnification of the electronic zoom has reached the lower limit A2. Then, it is assumed that the actual zoom speed of the optical zoom is faster than the zoom speed of the optical zoom predicted when the total zoom speed V0 is set. Set the zooming speed V2. When the actual zoom speed of the optical zoom is faster than the predicted zoom speed of the optical zoom, correction is performed using the correction magnification of the electronic zoom up to the lower limit magnification A2 in order to incorporate the total zoom speed into V0. . For this reason, it is necessary to set a new total overall variable speed V2. At this time, the relationship is V2> V0.

  In the next step S107, the system controller 223 determines whether or not the manual zoom operation has been stopped. The zoom operation is stopped by detecting the rotation speed of the zoom ring 112 with the zoom detection unit 108 and when the rotation speed of the zoom ring 112 falls below a predetermined threshold. If it is determined that the zoom operation has been stopped, the process proceeds to step S108. If not, the process returns to step S104, and the same operation is repeated thereafter.

  When the manual zoom operation is stopped, the system controller 223 performs the following processing after step S108 to return the electronic zoom to the reference magnification A0 in order to correct the zooming speed at the next zoom operation.

  Specifically, first, in step S108, the system controller 223 determines whether or not the magnification of the electronic zoom is larger than the reference magnification A0. As a result, when the magnification of the electronic zoom is larger than the reference magnification A0 (electronic zoom> A0), the process proceeds to step S109, and the user is prompted to increase the magnification of the optical zoom. This prompting is performed, for example, by displaying a message to that effect on the rear liquid crystal display unit 236. In the next step S110, it is determined whether or not the user has increased the optical zoom magnification in accordance with the prompt. Whether or not the optical zoom magnification has been increased is determined by detecting the rotation speed of the zoom ring 112 by the zoom detection unit 108. If the user has not increased the optical zoom magnification, the process returns to step S109, and the display for prompting the user to increase the optical zoom magnification is continued.

  If it is determined in step S110 that the optical zoom magnification has been increased, the process proceeds to step S111, and the system controller 223 performs control to reduce the magnification of the electronic zoom in inverse proportion to the optical zoom magnification. At this time, in order to prevent a change in the shooting angle of view, the zooming speed of the electronic zoom is controlled so that the total zooming ratio of the optical zoom and the electronic zoom is constant. In the next step S112, it is determined whether or not the electronic zoom has reached the reference magnification A0. If not, the process returns to step S111 to continue the control for reducing the electronic zoom magnification. On the other hand, if it is determined in step S112 that the electronic zoom reference magnification has become A0, the series of manual zoom correction ends, and the process waits until the next manual zoom correction starts.

  If it is determined in step S108 that the magnification of the electronic zoom is not larger than the reference magnification A0, the process proceeds to step S131, and the system controller 223 determines whether or not the magnification of the electronic zoom is smaller than the reference magnification A0. As a result, if the electronic zoom is smaller than the reference magnification A0 (electronic zoom <A0), the process proceeds to step S132, the electronic zoom is controlled to return the electronic zoom to the reference magnification A0, and a series of manual zoom corrections is completed. And wait until the next manual zoom correction starts. If it is determined in step S131 that the electronic zoom is greater than or equal to the reference magnification A0, a series of manual zoom corrections are immediately terminated and the process waits until the next manual zoom correction starts.

  In the present embodiment, the zooming speed of the optical zoom is detected by detecting the speed of the zoom ring 112, but the acceleration of the zoom ring 112 is detected by the existing acceleration detection technology. Thus, the zooming speed may be detected.

  The digital camera according to the above-described embodiment has optical scaling means (the zoom lens of the lens group 101 and the zoom ring 112) that can be scaled manually. Furthermore, it has an electronic zooming means (system controller 223, image data controller 220) that can be zoomed electronically by processing an image signal obtained by the image sensor (image sensor 209). The optical zooming speed detecting unit (zoom detecting circuit 108) detects the optical zooming speed of the optical zooming unit. In addition, based on the optical magnification rate detected by the optical magnification rate detection means, the overall magnification speed is set by combining the optical magnification rate and the electronic magnification rate by the electronic magnification means. It has setting means (system controller 223, image data controller 220). Further, the image forming apparatus includes total zoom speed correction means (system controller 223, image data controller 220) for correcting the electronic zoom speed so that the total zoom speed is constant even when the optical zoom speed changes.

  It should be noted that the electronic magnification when correcting the electronic magnification rate is within a predetermined range (between the upper limit magnification A1 and the lower limit magnification A2). Further, when the electronic magnification ratio when correcting the electronic magnification speed exceeds the predetermined range, a total magnification ratio is newly set (V1 or V2). When the manual operation of the optical scaling unit is stopped, the electronic scaling factor of the electronic scaling unit is returned to the reference scaling factor (A0). The optical zooming speed detecting means detects an operating speed or an operating acceleration of the optical zooming means. The total zooming speed setting means selects from a plurality of total zooming speeds prepared in advance.

  In this way, the zooming speed change of the optical zoom that can be zoomed manually is controlled so as to approach the zooming speed set in advance by the correction of the electronic zoom. Specifically, the zooming speed of the optical zoom is detected by detecting the rotation speed of the zoom ring 112 (corresponding to the moving speed of some lenses in the photographing lens group 101). Based on the zooming speed, the zooming speed by the electronic zoom is controlled. The total zoom speed of the optical zoom and the electronic zoom is configured to approach a predetermined fixed total zoom speed. As a result, the overall zooming speed becomes a constant speed by approaching a preset zooming speed. Therefore, even when the optical scaling is performed manually, an image (video) effect of scaling at a constant speed can be obtained, so that a highly convenient digital camera can be obtained.

108 Zoom detection unit 209 Image sensor 213 Image display unit 220 Image data controller 223 System controller 236 Rear liquid crystal display unit

Claims (6)

Optical scaling means that can be scaled manually,
An electronic scaling means capable of electronic scaling by processing an image signal obtained by the imaging device;
An optical zoom speed detecting means for detecting an optical zoom speed of the optical zoom means;
Based on the optical scaling speed detected by the optical scaling speed detecting means, a total scaling speed for setting a total scaling speed that combines the optical scaling speed and the electronic scaling speed by the electronic scaling means. Double speed setting means;
An imaging apparatus comprising: an overall zoom speed correction unit that corrects the electronic zoom speed so that the total zoom speed is constant even when the optical zoom speed changes.   The imaging apparatus according to claim 1, wherein an electronic magnification ratio when correcting the electronic magnification speed is within a predetermined range.   The imaging apparatus according to claim 2, wherein when the electronic magnification ratio at the time of correcting the electronic magnification speed exceeds the predetermined range, the total magnification ratio is newly set.   The imaging according to any one of claims 1 to 3, wherein when manual operation of the optical scaling unit is stopped, the electronic scaling factor of the electronic scaling unit is restored to a reference scaling factor. apparatus.   The imaging apparatus according to claim 1, wherein the optical scaling speed detection unit detects an operation speed or an operation acceleration of the optical scaling unit.   The imaging apparatus according to claim 1, wherein the total zoom speed setting unit selects from a plurality of total zoom speeds prepared in advance.

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