JP6104425B2 - IMAGING DEVICE AND IMAGING DEVICE CONTROL METHOD - Google Patents

Description

  The present invention relates to zoom control in a still image or moving image imaging apparatus.

Some imaging devices such as a digital camera have an optical scaling function by driving a zoom lens (optical zoom) and an electronic scaling function (electronic zoom) function for enlarging a part of an imaged area. is there. In recent years, it has become possible to shoot with the same lens from ultra-wide angle to super-telephoto due to the performance improvement of the zoom lens, and with the increase in the number of pixels of the image sensor, it has become possible to shoot with sufficient resolution even when the magnification is increased. It is coming.
On the other hand, a so-called preset zoom function and shuttle shot zoom function are known as functions for rapidly moving to an angle of view to be photographed. The preset zoom function is a function of moving from an arbitrary zoom position to a zoom position stored in advance in a memory by a user operating a switch. The shuttle shot zoom function is an extension function of the preset zoom function and has a function of returning to the original zoom position. In other words, the user operates the switch to move from an arbitrary zoom position to the zoom position stored in the memory, in which case the original zoom position is stored in the memory, and the preset zoom operation is completed. In this case, the original zoom position can be restored.

  Patent Document 1 discloses a control device related to a preset zoom function and a shuttle set zoom function. In this apparatus, the memory zoom operation from the first zoom state in one of the optical zoom region and the electronic zoom region to the second zoom state stored in the storage means in the other zoom region is performed. Can be done. In the apparatus disclosed in Patent Document 2, an operation member for selecting a zoom position storing operation by the preset zoom function and a reproduction operation to the stored zoom position, and another operation for executing the operation selected by the operation member. The member can be operated with different fingers.

JP 2006-50019 A JP 2001-117153 A

By the way, in an imaging apparatus having an ultra-high magnification zoom function, out-of-frame may occur due to slight movement of the subject when the angle of view is adjusted in the super-telephoto state. Even if the panning operation is performed by a photographer holding the camera, the range of the angle of view changes greatly. Thus, in the super-telephoto state, there is a problem that it is difficult to frame a subject that is a moving object to a desired angle of view.
In the preset zoom function and the shuttle set zoom function disclosed in Patent Documents 1 and 2, it is necessary to store the zoom position in the memory after the photographer performs an operation of once moving to the zoom position to be photographed. For this reason, it takes time to update the stored contents of the zoom position when the subject is chasing after moving out of the frame, or when the size of the subject changes. There is a possibility of missing a chance. Furthermore, in the prior art disclosed in Patent Document 2, it is necessary for a photographer to become familiar with the operation procedure in order to photograph a subject with a predetermined size while chasing a subject to be framed out. This is because it is necessary to store the zoom position while repeating the zoom operation with a plurality of operation members.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an imaging apparatus capable of photographing at a desired angle of view and a method for controlling the imaging apparatus while the photographer immediately captures the subject even when the subject is out of frame.

In order to solve the above-described problem, a first operation unit that accepts an operation for changing the zoom magnification of an image according to an embodiment of the present invention, and the operation of the image according to the operation through the first operation unit. When the first operation is performed via the first operation unit in the shooting preparation state before shooting, the control unit is configured to display the current zoom magnification. Is stored as the first zoom magnification, and the zoom magnification of the image is changed to the second zoom magnification set to the wide-angle side by a predetermined magnification change relative to the first zoom magnification , Further, when a second operation different from the first operation is performed via the first operation means, the control means changes the zoom magnification of the image to the stored first zoom magnification. you.

  According to the present invention, even when the subject goes out of the frame, the photographer can immediately take a picture with a desired angle of view while recapturing the subject.

It is a block diagram which shows the structural example of the digital camera which concerns on embodiment of this invention. It is the figure which illustrated the relationship between a focal distance and a focus lens position for every subject distance. It is the figure which illustrated the angle of view in the subject search state and the angle of view in the shooting preparation state. It is a flowchart explaining the example of a process of the zoom function which concerns on embodiment of this invention. It is a figure explaining the calculation method of the zoom out position by electronic zoom and optical zoom. 6 is a flowchart for explaining an operation example during a zoom operation in a subject search state. 7 is a flowchart for explaining an operation example different from FIG. 6. It is a flowchart explaining the operation example in which a photographer can select the operation | movement of FIG. 6 and the operation | movement of FIG. It is a flowchart explaining the example of a process of the zoom function which concerns on embodiment of this invention in the state which fixed the camera to the tripod.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The function realized by the present invention is a zoom function that supports framing by a photographer, and for convenience, will be referred to as a framing assist zoom function (hereinafter abbreviated as FA zoom function).
FIG. 1 is a block diagram illustrating a configuration example of a digital camera 100 as an example of an imaging apparatus according to the present embodiment. The lens barrel 101 drives a lens while holding a lens group therein. The zoom lens 102 optically changes the angle of view by adjusting the focal length, and the focus lens 103 adjusts the focus. The anti-vibration lens 104 is a correction lens that corrects camera shake, and the diaphragm and shutter 105 that adjust the amount of light are used for exposure control. The light passing through the lens barrel 101 is received by an image sensor 106 using a CCD (charge coupled device), a CMOS (complementary metal oxide semiconductor), or the like, and converted from an optical signal to an electrical signal. The electrical signal is input to the image processing circuit 107, subjected to pixel interpolation processing, color conversion processing, and the like, and then sent to the image memory 108 as image data. The image memory 108 is configured by a DRAM (Dynamic Random Access Memory), an SRAM (Static Random Access Memory), or the like.
The display unit 109 is configured by a TFT type LCD (Thin Film Transistor Driven Liquid Crystal Display) or the like, and displays specific information (for example, shooting information and an FA zoom frame described later) together with the shot image data. By displaying information such as live view, an electronic viewfinder (EVF) function for the photographer to adjust the angle of view is realized.

The aperture shutter drive unit 110 calculates an exposure control value (aperture value and shutter speed) based on luminance information obtained by image processing in the image processing circuit 107, and drives the aperture and shutter 105 based on the calculation result. . Thereby, AE (automatic exposure) control is performed. The anti-vibration lens driving unit 111 calculates a blur amount applied to the digital camera 100 based on information from an angular velocity sensor such as a gyro sensor, and drives the anti-vibration lens 104 so as to cancel the blur.
The focus lens driving unit 112 drives the focus lens 103. For example, in contrast AF (autofocus) control, the focus lens 103 is focused on the subject based on focus adjustment information (contrast evaluation value) of the photographing optical system obtained by image processing of the image processing circuit 107. Driven. For the application of the present invention, the focus adjustment control does not matter, and a phase difference AF method or a method combined with another method can be employed. The zoom lens driving unit 113 drives the zoom lens 102 in accordance with a zoom operation instruction. The operation unit 117 is provided with a zoom lever or a zoom button as a zoom operation member for the photographer to instruct the camera to perform zooming. The zoom drive speed and drive direction are calculated based on the operation amount and operation direction of the zoom operation switch used for the zoom operation instruction, and the zoom lens 102 moves along the optical axis according to the calculation result.

The image data generated by the shooting operation is sent to the recording unit 116 via the interface (I / F) unit 115 and recorded. The image data is recorded in an external recording medium such as a memory card used by being mounted on the camera, a non-volatile memory 118 built in the digital camera 100, or both.
In addition to the zoom operation switch, the operation unit 117 includes a release switch for instructing start of photographing, an FA zoom operation switch for instructing start and end of the FA zoom function, and the like. The operation signal is sent to the system control unit 114 described later. In addition to program data and image data, the memory 118 stores setting information of the digital camera 100 and information such as a zoom return position in an FA zoom function described later. The zoom return position is a return position when returning to the zoom position at the start when the FA zoom ends, and details thereof will be described later.
The system control unit 114 is configured using an arithmetic device such as a CPU (Central Processing Unit), and controls the entire camera by sending a control command to each unit in response to a user operation. The system control unit 114 executes various control programs stored in the memory 118, for example, programs for performing control of the image sensor 106, AE / AF control, zoom control (including FA zoom processing), and the like.

Next, control related to the FA zoom function in the system control unit 114 will be described. In FIG. 1, internal processing of the system control unit 114 is expressed as functional blocks as control units 119 to 122.
In order to maintain the in-focus state even when the angle of view is changed by the optical zoom, in the case of the rear focus type lens barrel shown in the lens barrel 101, the focus lens 103 is moved to an appropriate focus position according to the position of the zoom lens 102. Must be moved. Such control is called computer zoom (CZ) control. FIG. 2 is a graph showing a data table showing the relationship between the focal length of the zoom lens and the focus lens position in focus for each distance to the subject. This table is called a focus cam table. The horizontal axis indicates the focal length corresponding to the zoom lens position, the vertical axis indicates the focus position, and the distance from the camera to the subject (subject distance) is indicated beside each graph line. The system control unit 114 performs the scanning operation by controlling the focus lens driving unit 112 and moving the focus lens 103 within a predetermined range during the AF operation. The focus lens position that is the focal point is detected by a known method using the contrast evaluation value or the like obtained during this operation. The subject distance can be measured by referring to the focus cam table from the zoom lens position and the focus lens position at that time.

The digital camera 100 has an optical zoom function and an electronic zoom function. The CZ control unit 119 and the zoom lens driving unit 113 are in charge of optical zoom driving. The CZ control unit 119 detects the position of the zoom lens 102 every predetermined control period during the zoom operation, and follows the focus cam table at the subject distance measured by the AF operation according to the position. Drive. This makes it possible to perform an optical zoom operation while maintaining the in-focus state.
On the other hand, the electronic zoom control unit 120 and the image memory 108 are in charge of electronic zoom driving. The electronic zoom control unit 120 realizes an electronic zoom function by cutting out a target area from the image data transferred to the image memory 108. In addition, a smooth electronic zoom display can be realized by gradually increasing the range to be extracted at the frame rate period of the video to be captured by the image sensor 106 and displaying the range on the display unit 109.

Next, an overview of the FA zoom function and the FA zoom frame control unit 121 and the FA zoom control unit 122 will be described. Conventionally, when a photographer framing in a telephoto state and waiting for a photo opportunity, the subject moves out of the frame and the like, the photographer needs to perform the following operations.
-Search for a subject by zooming out by operating the zoom operation switch.
-Adjust the angle of view by zooming until the desired angle of view is reached again.
On the other hand, in the digital camera 100 equipped with the FA zoom function, if the subject loses sight in a state in which the angle of view is adjusted before shooting (hereinafter referred to as a shooting preparation state), the photographer switches the FA zoom operation switch. Can be operated. This FA zoom operation switch is a switch assigned for the FA zoom function, and instructs the camera to start the FA zoom function by pressing a member different from the operation member of the zoom operation switch. The FA zoom control unit 122 stores the zoom positions of the electronic zoom and the optical zoom in the memory 118 when a start instruction is issued from the FA zoom operation switch. Further, the FA zoom control unit 122 instructs the CZ control unit 119 or the electronic zoom control unit 120 to zoom out according to the processing procedure of FIG. 4 to be described later, and the angle of view is zoomed out from the shooting preparation state. (Hereinafter referred to as subject search state).

FIG. 3A shows the angle of view in the zoom-out state, and FIG. 3B shows the angle of view in the zoom-in state. As shown in FIG. 3A, the FA zoom frame control unit 121 calculates the size indicating the angle of view in the stored shooting preparation state, and the frame 300, that is, FA zoom, is displayed at the center of the EVF of the display unit 109. Display a frame. The size of the FA zoom frame 300 is calculated based on the zoom magnification at the time of zooming out. For example, when the electronic zoom magnification is 2 times and the optical zoom magnification is 3 times from the shooting preparation state and the subject search state is entered after zooming out, the angle of view displayed on the EVF in the subject search state is ( A FA zoom frame having a size of 1/2) × (1/3) = 1/6 times is displayed.
While the FA zoom operation switch is pressed, the zoom-out state is maintained. When the photographer finds a desired subject in the subject search state, framing is performed so that the subject fits within the FA zoom frame using the FA zoom frame 300 as a guide. Thereafter, when the photographer releases the FA zoom operation switch and instructs the camera to end the FA zoom, the FA zoom control unit 122 performs a zoom-in operation by electronic zoom or optical zoom up to the stored zoom position in the shooting preparation state. . Thus, the optimum framing state as shown in FIG. 3B is obtained. With this processing, the photographer can shoot at a desired angle of view while re-framing the framed out subject with a simple operation.

Next, a processing example of the FA zoom function will be described with reference to FIG.
In S100, the FA zoom control unit 122 determines whether the FA zoom operation switch of the operation unit 117 is pressed in the shooting preparation state. When the pressing of the FA zoom operation switch is detected, the FA zoom process starts. In S101, the FA zoom control unit 122 acquires the optical zoom position in the shooting preparation state from the CZ control unit 119, and acquires the electronic zoom position from the electronic zoom control unit 120. Further, the FA zoom control unit 122 stores the data of the optical zoom position and the electronic zoom position in the memory 118. The optical zoom position represents the position of the zoom lens corresponding to the zoom magnification that can be changed by the optical zoom function, and the electronic zoom position represents the control position corresponding to the magnification of image enlargement and reduction that can be changed by the electronic zoom function. .

  In S <b> 102, the FA zoom control unit 122 acquires the zoom-out drive amount stored in the memory 118. The zoom-out drive amount can be changed by the photographer by an operation on the setting menu. In this case, the operation unit 117 and the display unit 109 constitute a zoom-out drive amount setting unit. In this example, a zoom-out operation, which will be described later, is performed according to a preset zoom-out drive amount. The form in which the FA zoom control unit 122 controls the operation step by step or until the photographer performs a stop operation. The zoom-out operation is continued. In S103, the FA zoom control unit 122 determines whether or not the zoom state in the shooting preparation state is the electronic zoom state. In a general zoom operation, when the zoom operation switch of the operation unit 117 is pressed, if the optical zoom position is between the wide end and the tele end, the optical zoom is driven under the control of the CZ control unit 119. . When the optical zoom position is at the tele end and an operation instruction in the tele direction is given, the electronic zoom control unit 120 drives the electronic zoom to enable super telephoto shooting. In order to ensure consistency between the zoom operation by the operation of the zoom operation switch and the FA zoom operation, even in the FA zoom operation, when the zoom state in the shooting preparation state is the electronic zoom state, the electronic zoom is driven first. That is, it is determined whether or not the zoom position stored in the memory 118 is within the zoom area in the zoom state to be prioritized. In this example, the electronic zoom is prioritized, so in S103 the zoom position is the electronic zoom area. It is determined whether or not there is. If the zoom state at the start of FA zoom is the electronic zoom state, the process proceeds to S104. In S104, the FA zoom control unit 122 calculates the zoom-out position of the electronic zoom from the electronic zoom position acquired in S101 and the zoom-out drive amount acquired in S102 according to the zoom-out position calculation method described later, and the electronic zoom control unit 120. Set to. In S105, the FA zoom control unit 122 instructs the electronic zoom control unit 120 to perform the scaling process up to the zoom-out position of the electronic zoom set in S104. The electronic zoom control unit 120 performs a zoom-out operation by electronic zoom.

  When it is determined in S103 that the zoom position in the shooting preparation state is in the optical zoom area, or after a zoom-out operation of electronic zoom is performed in S105, the process proceeds to S106. In S106, the FA zoom control unit 122 determines whether further zoom-out by optical zoom is necessary. That is, when the electronic zoom alone is not sufficient for the zoom drive of the set zoom-out drive amount, it is necessary to supplement the remaining zoom-out drive amount with the optical zoom (the calculation of the remaining drive amount will be described later). If it is determined that zoom-out by optical zoom is necessary, the process proceeds to S107, and if zoom-out by optical zoom is not necessary, the process proceeds to S109. In S107, the FA zoom control unit 122 calculates the zoom-out position of the optical zoom from the optical zoom position and the zoom-out drive amount according to the calculation method described later, and sets it in the CZ control unit 119. In S108, the FA zoom control unit 122 instructs the CZ control unit 119 to perform zoom driving to the optical zoom zoom-out position set in S107. The CZ control unit 119 controls the zoom lens driving unit 113 to perform a zoom-out operation of optical zoom. Then, the process proceeds to S109.

  In step S109, the FA zoom control unit 122 instructs the FA zoom frame control unit 121 to display an FA zoom frame corresponding to the zoom-out magnification, and sets the subject search state. In S110, the FA zoom control unit 122 determines whether or not the FA zoom operation switch of the operation unit 117 is opened in the subject search state and is turned off. When the FA zoom control unit 122 detects that the FA zoom operation switch is turned off, the FA zoom control unit 122 starts the FA zoom end operation after S111. In S111, the FA zoom control unit 122 reads the data of the zoom position (zoom return position) stored in S101 from the memory 118. In S112, the FA zoom control unit 122 determines whether or not the zoom state in the subject search state is the optical zoom state. In the optical zoom state (Yes in S112), the process proceeds to S113 in order to perform zoom-in with priority on the optical zoom. Proceed with the process. In S113, the FA zoom control unit 122 sets the zoom-in position by optical zoom in the CZ control unit 119 among the zoom return positions read in S111. In S114, the FA zoom control unit 122 instructs the CZ control unit 119 to drive the zoom lens 102 to the zoom-in position by the optical zoom set in S113. The CZ control unit 119 controls the zoom lens driving unit 113 to perform a zoom-in operation with optical zoom.

  When it is determined in S112 that the zoom position in the subject search state is within the electronic zoom area, or after the zoom-in operation is performed with the optical zoom in S114, the process proceeds to S115. In S115, the FA zoom control unit 122 determines whether or not further zoom-in by electronic zoom is necessary. If zoom-in by electronic zoom is necessary, the process proceeds to S116, and if zoom-in by electronic zoom is not necessary, the shooting preparation state is set and the process ends. In S <b> 116, the FA zoom control unit 122 sets the zoom-in position by electronic zoom in the electronic zoom control unit 120 among the zoom return positions read in S <b> 111. In S117, the FA zoom control unit 122 instructs the electronic zoom control unit 120 to perform the scaling process up to the zoom-in position by the electronic zoom set in S116. The electronic zoom control unit 120 performs an electronic zoom-in operation, thereby returning to the zoom return position. When the operation is finished, the photographing preparation state is set and the process is finished.

  Next, a method for calculating the zoom-out position of the electronic zoom and optical zoom set in S104 and S107 of FIG. 4 will be described with reference to FIG. FIG. 5A is a diagram illustrating an example of a zoom-out operation when the zoom-out drive amount is set as a continuous amount based on the zoom magnification. In this example, when the focal length of the optical zoom is in the range of 24 to 840 mm, the optical zoom magnification is set to a maximum of 35 times, the electronic zoom magnification is set to a maximum of 4 times, and the zoom-out drive amount is converted to a zoom magnification to 1/8 times. It is said that. In the figure, “optical wide end” and “optical tele end” indicate the wide end (focal length 24 mm) and tele end (focal length 840 mm) in the optical zoom operation, respectively, and represent the boundaries of the optical zoom region. “Electronic wide end” and “electronic tele end” indicate a wide end (equivalent to a focal length of 840 mm) and a tele end (equivalent to a focal length of 3360 mm) in the electronic zoom operation, respectively, and represent the boundaries of the electronic zoom region. The optical telephoto end position matches the electronic wide end position.

Pattern 1 shows a zoom-out position when the zoom position in the shooting preparation state is a focal length of 840 mm at the optical telephoto end position. Since the zoom state in the shooting preparation state is the optical zoom state, the electronic zoom position remains at the electronic wide end position. When the optical zoom position is changed with the zoom-out drive amount corresponding to the zoom magnification of 1/8, the position corresponding to the focal length of 840 mm × (1/8 times) = 105 mm is the zoom-out position.
Pattern 2 shows the zoom-out position when the zoom position in the shooting preparation state is the optical middle position and the focal length is 192 mm. The zoom-out position of the optical zoom at this time is the zoom-out position at the optical wide end position corresponding to a focal length of 192 mm × (1/8 ×) = 24 mm.

Pattern 3 shows the zoom-out position when the zoom position in the shooting preparation state is the optical middle position and the focal length is 72 mm. The calculation result of the zoom-out position of the optical zoom is 72 mm × (1/8 times) = 9 mm, which is a position on the wide angle side from the optical wide end position. In this case, the optical wide end position is set as the zoom-out position.
Pattern 4 shows the zoom-out position when the zoom position in the shooting preparation state is the electronic telephoto end position. Since the electronic zoom magnification is a maximum of four times, the zoom-out position of the electronic zoom is set to the electronic wide end position, and the zoom-out operation with the optical zoom is performed for the remaining two times. Therefore, the zoom-out position by the optical zoom is a position corresponding to a focal length of 840 mm × (½ times) = 420 mm.

  When the zoom-out drive amount is set based on the zoom magnification, the size of the FA zoom frame in the subject search state is constant except when the zoom-out position exceeds the optical wide end position as in pattern 3. That is, there is an advantage that the zoomed out angle of view becomes the same magnification.

  FIG. 5B is a diagram illustrating an example of the zoom-out operation when the zoom-out drive amount is set based on the number of zoom steps. The number of zoom steps refers to the number of stop-division zooms in the step zoom function that stops only at zoom positions determined in stages, and the zoom position is represented by a discrete amount. In this example, the number of steps of optical zoom is 13 steps of optical W (wide), optical M1 to M11, and optical T (tele). The optical W corresponds to the optical M0, and the optical T corresponds to the optical M12. The number of steps of the electronic zoom is four steps of electron W (wide), electrons M1 and M2, and electron T (tele). The electron W corresponds to the electron M0, and the electron T corresponds to the electron M3. The zoom-out drive amount is 6 steps.

Pattern 5 shows the zoom-out position when the zoom position in the shooting preparation state is the optical telephoto end position (= electronic wide end position). Since the zoom state in the shooting preparation state is the optical zoom state, the electronic zoom remains at the electronic wide end position. The optical zoom position is optical T (= M12), and the position of M12-6 (step) = M6 is the zoom-out position.
Pattern 6 represents a zoom-out position when the zoom position in the shooting preparation state is the optical middle position M6. The zoom-out position of the optical zoom at this time is M6-6 (step) = M0, and the optical wide end (optical W) position is the zoom-out position.

Pattern 7 shows a zoom-out position when the zoom position in the shooting preparation state is the optical middle position M4. When the zoom-out position of the optical zoom is calculated, M4-6 (step) = M (−2), which is a position on the wide angle side with respect to the optical wide end position. In this case, the optical wide end (optical W) position is set as the zoom-out position.
Pattern 8 shows the zoom-out position when the zoom position in the shooting preparation state is the electronic telephoto end position (electronic T). Since the maximum number of electronic zoom steps is four, the zoom-out position of the electronic zoom is the electronic wide end position, and the zoom-out operation is performed with the optical zoom for the remaining two steps. Therefore, the zoom-out position of the optical zoom is M12-2 (step) = M10.

When the zoom-out drive amount is set based on the number of zoom steps as described above, the zoom-out position can be basically calculated only by subtraction, so that there is an advantage that the arithmetic processing becomes easy.
The calculation of the zoom-in position performed in S113 and S116 in FIG. 4 is performed in the same manner as described above except that the optical zoom is prioritized, and thus the description thereof is omitted.

  6 to 8 are flowcharts showing an example of an operation when the photographer operates the zoom operation switch in the subject search state, that is, the zoom-out state before the end of the FA zoom operation is determined in S110 of FIG. It is.

  FIG. 6 shows a processing example in which zoom driving is performed in the same manner as the zoom operation in the shooting preparation state when the photographer operates the zoom operation switch in the subject search state. In S200, the FA zoom control unit 122 determines whether or not the FA zoom operation switch of the operation unit 117 has been turned off. When the switch is determined to be in the off state, the subject search state is terminated. If the FA zoom operation switch is on, the process proceeds to S201, and the FA zoom control unit 122 determines whether or not the zoom operation switch has been operated in the subject search state. If the zoom operation switch is operated, the process proceeds to S202. If the switch is not operated, the process returns to S200. In S202, the FA zoom control unit 122 determines whether the current zoom state is an electronic zoom state or an optical zoom state. If it is in the electronic zoom state, the process proceeds to S203, and if it is in the optical zoom state, the process proceeds to S204.

In S203, the FA zoom control unit 122 sends a control command to the electronic zoom control unit 120 to perform an electronic zoom operation. In step S204, the FA zoom control unit 122 sends a control command to the CZ control unit 119 to perform an optical zoom operation. In either case, the zooming operation in the tele direction (telephoto direction) or the wide direction (wide angle direction) is performed according to the operation direction of the zoom operation switch, that is, the zoom-in direction or zoom-out direction. After S203 or S204, the process proceeds to S205, and when the zoom operation is performed in the tele direction by the zoom operation, the FA zoom control unit 122 has reached the zoom return position to zoom in at the end of the FA zoom operation. It is determined whether or not. If the zoom position has reached the zoom return position, the zoom operation is forcibly terminated and the process returns to S200. If the zoom position does not reach the zoom return position, the process proceeds to S206. In step S <b> 206, the FA zoom control unit 122 determines whether or not the zoom operation has been completed according to the pressed state of the zoom operation switch. If it is determined that the zoom operation has ended, the process returns to S200. If it is determined that the zoom operation is continued, the process returns to S202, and the zoom operation is continued.
According to the process shown in FIG. 6, when the subject has not entered the frame even when the subject search state has been reached, the photographer performs a zoom operation to immediately widen the angle of view and select the subject. This is effective for re-searching or narrowing the range of the angle of view in the subject search state.

FIG. 7 shows an example of processing for changing the zoom return position when the photographer operates the zoom operation switch in the subject search state. The difference from FIG. 6 is the processing of S302 and S303 following S201. Therefore, the description of the processing given the same step number as in FIG. 6 is omitted, and the difference will be described below.
When the zoom operation is performed in S201, the process proceeds to S302, and the FA zoom control unit 122 updates the zoom return position data stored in the memory 118 in S101 of FIG. 4 according to the operation direction of the zoom operation switch. The zoom return position data is updated along the tele direction while the operation direction of the zoom operation switch by the photographer is the tele direction, and the zoom return position data is updated along the wide direction while the operation direction is the wide direction. Updated. In next step S303, the FA zoom control unit 122 instructs the FA zoom frame control unit 121 to update the FA zoom frame. The FA zoom frame control unit 121 recalculates the size of the FA zoom frame according to the zoom return position updated in S302, and updates the EVF display of the FA zoom frame. Then, the process proceeds to S205.
According to the processing shown in FIG. 7, when the subject size changes from the time when the photographer performs framing in the shooting preparation state, the request to adjust the angle of view to zoom in while maintaining the subject search state can be met. it can.

FIG. 8 shows an example in which the operation described with reference to FIGS. 6 and 7 can be selectively performed when the photographer operates the zoom operation switch in the subject search state. The difference from FIG. 6 is the processing of S402 to 404 following S201. Therefore, the description of the processing given the same step number as in FIG. 6 is omitted, and the difference will be described below.
In S402, the FA zoom control unit 122 determines the zoom operation mode in the subject search state. In the case of the zoom drive mode, the process proceeds to S403 and the processes of S202 to 205 in FIG. 6 are executed. In the zoom return position change mode, the process proceeds to S404 and the processes of S302, S304, and S205 in FIG. . Examples of the mode setting include a method in which an operator sets a mode using a setting menu, a method in which a mode is set using an operation member assigned to the operation unit 117, and the like. After S403 and S404, the process proceeds to S206.
According to the process shown in FIG. 8, since the photographer can select the zoom drive mode and the zoom return position change mode in the subject search state, convenience is improved.

  Next, a process for changing the zoom drive speed and the zoom drive amount when the digital camera 100 is fixed to a tripod and the FA zoom process is executed will be described. The tripod detection unit 123 shown in FIG. 1 detects whether the digital camera 100 is fixed to a tripod (not shown) and sends the detection result to the FA zoom control unit 122. For example, there is a method of determining that the camera is fixed to a tripod when a state where the vibration level detected by a vibration detection device used for camera shake detection or the like continues for a reference time or longer continues. In addition, a method of detecting a contact with a tripod by providing a detection switch in the camera may be used.

FIG. 9 is a flowchart illustrating an example of processing for changing the zoom drive speed and the zoom drive amount. The steps different from FIG. 4 are the processes of S503 to S505 between S102 and S103, and the processes of S515 and 516 between S111 and S112. Therefore, the difference will be described below.
When the photographer performs the FA zoom process while holding the digital camera 100 in his / her hand, it may not return to the intended composition due to camera shake. In addition, when a sudden change in the angle of view is performed when zooming out or zooming in, the photographer may lose sight of the subject again depending on the timing of camera shake. For this reason, even with the FA zoom function, zoom speed control with continuity is necessary when zooming in. However, when the FA zoom process is performed with the camera fixed on a tripod, subject frame out and field angle change due to camera shake or panning in the super-telephoto state can be minimized. For this reason, it is possible to increase the zoom drive speed during zoom-out or zoom-in to the maximum value, and to change the zoom-out drive amount.

In S503 following S102, the tripod detection unit 123 detects whether or not the digital camera 100 is fixed to the tripod. If the camera is fixed to a tripod at the start of the FA zoom operation, the process proceeds to S504. If the camera is not fixed to the tripod, the process proceeds to S103.
In S504, the FA zoom control unit 122 changes the zoom-out drive amount acquired in S102 to the zoom-out drive amount when the tripod is fixed. This zoom-out drive amount is set to a larger value than when shooting without using a tripod. This may be a preset value, or may be a form that can be changed within a predetermined range by the photographer through an operation on the setting menu. In step S <b> 505, the FA zoom control unit 122 changes the zoom-out speed when performing the zoom-out operation (zoom drive speed during zoom-out) to the zoom-out speed when the tripod is fixed. The zoom-out speed when the tripod is fixed is basically set to the maximum speed allowed by the zoom drive control, but the photographer can change the zoom-out speed within a predetermined range by operating the setting menu. Good. The zoom-out speed when the tripod is fixed is larger than the speed set when the camera is not fixed to the tripod.

  In S515 subsequent to S111, the tripod detection unit 123 detects whether or not the digital camera 100 is fixed to the tripod. If it is detected that the camera is fixed to a tripod at the end of the FA zoom operation, the process proceeds to S516. If it is detected that the camera is not fixed to the tripod, the process proceeds to S112. In S516, the FA zoom control unit 122 changes the zoom-in speed when performing the zoom-in operation (the zoom drive speed when zooming in) to the zoom-in speed when the tripod is fixed. The zoom-in speed when the tripod is fixed is basically set to the maximum speed allowed by the zoom drive control, but it may be configured such that the photographer can change the zoom-in speed within a predetermined range by an operation on the setting menu. The zoom-in speed when the tripod is fixed is larger than the speed set when the camera is not fixed to the tripod.

  According to the processing shown in FIG. 9, since the operation is quickly performed by setting the zoom-out speed and the zoom-in speed to the maximum values in the FA zoom operation when using a tripod, the usability of the camera is improved. Also, it is effective when the photographer searches for a subject in a wider range by changing the zoom-out drive amount to a larger value than when not using a tripod.

  As mentioned above, although preferable embodiment of this invention was described, a various deformation | transformation and change are possible within the range of the summary of this invention. For example, in the above embodiment, the electronic zoom is prioritized in the zoom-out operation of FIG. 4, but the optical zoom may be prioritized. In this case, it is determined whether or not the zoom position stored in the memory 118 is within the optical zoom area. When the zoom position calculated according to the zoom-out drive amount in the optical zoom region extends beyond the zoom region to the electronic zoom region, the zoom position is changed according to the calculated zoom-out drive amount for the remaining amount. In the above embodiment, as the operation instruction means, an example is shown in which the subject search state is maintained while the FA zoom operation switch is pressed, and the camera is instructed to end the FA zoom operation by opening the switch. However, the present invention is not limited to this, and an operation instruction unit that starts FA zoom by opening the switch after pressing the FA zoom operation switch and ends the FA zoom operation by pressing and releasing the switch again may be used. In addition, an operation instruction unit that combines a plurality of buttons, such as a combination of a FA zoom operation switch and a zoom operation switch to give a start or end instruction, may be used.

DESCRIPTION OF SYMBOLS 100 Digital camera 102 Zoom lens 109 Display part 114 System control part 116 Recording part 117 Operation part 118 Memory 119 CZ control part 120 Electronic zoom control part 121 FA zoom frame control part 122 FA zoom control part 123 Tripod detection part

Claims (11)

First operating means for accepting an operation for changing the zoom magnification of the image;
An image pickup apparatus having control means for controlling a zoom magnification of the image according to an operation through the first operation means,
In the shooting preparation state before shooting ,
If the first operation is performed through the pre-Symbol first operating means, the control means stores the current zoom magnification as the first zoom magnification, relative to the first zoom magnification In other words, the zoom magnification of the image is changed to a second zoom magnification set to the wide-angle side by a predetermined magnification change , and further, a second operation different from the first operation is performed via the first operation means. If is performed, the control means, the image pickup apparatus characterized that you change the zoom magnification of the image to the stored first zoom magnification. A release means for accepting an operation for instructing the start of shooting;
The imaging apparatus according to claim 1, wherein the photographing preparation state is a state before an operation through the release unit is performed.   The imaging apparatus according to claim 2, wherein the first operation unit is provided separately from the release unit. The control means controls display means for displaying the image;
When the first operation is performed via the first operation unit, the control unit superimposes the image on the image while changing the zoom magnification of the image to the second zoom magnification. 4. The image pickup apparatus according to claim 1, wherein the display unit performs control so as to perform display indicating an angle of view corresponding to a first zoom magnification. 5.   The control by the control means includes at least one control of an optical zoom for changing a focal length by driving a zoom lens and an electronic zoom for changing a zoom magnification of the image by image processing. 5. The imaging device according to any one of 4. The control by the control means includes control of the optical zoom and the electronic zoom,
When changing the zoom magnification from the telephoto end of the optical zoom further to the telephoto side, the control means changes the zoom magnification of the image by the electronic zoom,
6. The control unit according to claim 5, wherein when the zoom magnification is changed from the first zoom magnification to the second zoom magnification, the electronic zoom is preferentially changed when the zoom magnification is changed. Imaging device. A second operation means for receiving an operation for instructing a telephoto direction or a wide-angle direction;
When the operation through the second operation unit is performed before the second operation is performed through the first operation unit, the control unit operates through the second operation unit. The imaging apparatus according to claim 1, wherein the zoom magnification of the image is changed in a direction according to the image quality. A second operation means for receiving an operation for instructing a telephoto direction or a wide-angle direction;
When the operation through the second operation unit is performed before the second operation is performed through the first operation unit, the control unit operates through the second operation unit. The imaging apparatus according to claim 1, wherein the first zoom magnification stored is changed in a direction corresponding to the first zoom magnification. Detecting means for detecting whether or not the imaging device is fixed to a tripod;
When the detection unit detects that the imaging device is fixed to a tripod, the control unit determines the amount of change from the first zoom magnification to the second zoom magnification, and the imaging device uses a tripod. The imaging apparatus according to claim 1, wherein the imaging device is changed to a value larger than the amount of change when the distance is not fixed. Detecting means for detecting whether or not the imaging device is fixed to a tripod;
In the control unit, when the detection unit detects that the imaging device is fixed to a tripod, the first operation or the second operation is performed via the first operation unit. The imaging apparatus according to claim 9, wherein the zoom magnification changing speed is changed to a value larger than the changing speed when the imaging apparatus is not fixed to a tripod. An image pickup apparatus control method having a first operation means for accepting an operation for changing an image zoom magnification,
In the shooting preparation state before shooting ,
If the first operation is performed through the pre-Symbol first operation means stores the current zoom magnification as the first zoom magnification, relatively predetermined magnification with respect to the first zoom magnification Changing the zoom magnification of the image to a second zoom magnification set to the wide-angle side by the amount of change;
And a step of changing the zoom magnification of the image to the stored first zoom magnification when a second operation different from the first operation is performed via the first operation means. control method for an imaging apparatus according to claim to Rukoto.

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