JP2015072321A - IMAGING DEVICE AND IMAGING DEVICE CONTROL METHOD - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method that enables a change of a Tv value or an ISO value after maintaining an exposure to be performed in order upon maintaining the exposure with a Tv value or an ISO value shifted when a full-aperture Av value or a minimum Av value is changed and a setting Av value varies.SOLUTION: An imaging device comprises: upper limit and lower limit setting means of a setting TV value and a setting ISO value; determination means for determining whether there is a change in a full-aperture or a minimum aperture value; means for, when there is the change therein, changing a Tv value so as to be the same exposure value as that before changed; means for, as a result of the determination means, when there is the change therein, changing an ISO value so as to be the same exposure value as that before changed; setting means for, when there is a change, setting whether to change the TV value of the ISO value; and control means for, when changing the TV value, controlling the means for changing the TV value is controlled within a range set by the upper limit and lower limit setting means of the setting TV value, and when changing the ISO value, controlling the means for changing the ISO value within a range set by upper limit and lower limit means of the setting ISO value.

Description

  The present invention relates to an imaging apparatus such as an electronic still camera, and more particularly to a method for controlling an interchangeable lens imaging apparatus.

  When the shooting mode is the manual mode and the set Av value is set to the full aperture value or the minimum aperture value of the lens, the zoom value or the minimum aperture value may change the open F value or the minimum aperture value of the lens.

  At this time, when the set value exceeds the open F value or the minimum aperture value of the lens, the open F value or the minimum aperture value of the lens is forcibly set to the set value.

  When such a situation occurs, the user often does not notice that the setting value has changed, and in that case, the number of failed photos with different exposures increases.

  In order to solve this problem, there is a method of automatically changing the Tv value and the ISO value so that there is no change in exposure (Patent Document 1). In Patent Document 1, it is determined whether or not the zoom lens has moved, the Bv value is estimated based on the change in the F value of the lens obtained in conjunction with the movement, and the shutter speed is changed.

JP 2008-263492 A

  However, in the prior art disclosed in Patent Document 1, when the setting range of the TV value and the ISO value is determined, for example, when the TV value is changed beyond the above setting range so that the exposure does not change, Although the exposure is correct, the setting value may not be changed in order because the setting range is exceeded when the TV value is subsequently changed.

  In order to solve the above problems, the present invention includes an upper limit / lower limit setting means for setting TV value, an upper limit / lower limit setting means for setting ISO value, a determination means for determining whether or not there is a change in the open aperture value or the minimum aperture value, As a result of the determination means, when there is a change, the TV value changing means for changing the TV value so as to be the same as the exposure value before the change, and as a result of the determination means, there is a change before the change. Setting means for setting whether to change the TV value or the ISO value when there is a change as a result of the ISO value changing means for changing the ISO value and the determination means so as to be the same as the exposure value; As a result of the setting means, when the TV value is set to be changed, the TV value changing means is controlled within the range set by the upper and lower limit setting means of the set TV value, and the result of the setting means, If it was set to change the ISO value, An image pickup apparatus comprising: a control unit that controls the ISO value changing unit within a range set by an upper limit / lower limit setting unit.

  According to the present invention, it is possible to maintain the exposure even if the setting is unexpectedly changed due to a change in the aperture value of the lens, and it is also possible to change the setting within the range determined by the user. . By making these things possible, it is possible to reduce the number of failed photos and realize comfortable operability.

1 is a configuration block diagram of an imaging apparatus as an embodiment of the present invention. (a), (b) is an external view of the imaging device as one Embodiment of this invention. It is a flowchart for maintaining exposure when the open Av value or the minimum Av value changes. It is a flowchart at the time of shifting Tv value in order to maintain exposure. It is a flowchart at the time of shifting ISO value in order to maintain exposure. FIG. 10 is a GUI image diagram for setting whether to maintain exposure when the Av value is changed using a Tv value, using an ISO value, or not. It is a GUI image figure which sets the upper and lower limit value of setting Tv value, and is a figure when an upper limit is 1/250 and a lower limit is 1/125. It is a GUI image figure which sets the upper and lower limit value of setting Tv value, and is a figure when an upper limit is 1/8000 and a lower limit is 30 seconds. It is a GUI image diagram for setting the upper and lower limit values of the set ISO value, and the upper limit value is 1600 and the lower limit value is 1000. It is a GUI image diagram for setting the upper and lower limit values of the set ISO value, and the upper limit value is 12800 and the lower limit value is 100.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing the configuration of an imaging apparatus 200 as an embodiment of the present invention.

  The lens unit 100 is a lens unit on which an interchangeable photographic lens is mounted. The lens 5 is usually composed of a plurality of lenses, but here, only a single lens is shown for simplicity. The communication terminal 6 is a communication terminal for the lens to communicate with the imaging device side, and the communication terminal 10 is a communication terminal for the imaging device to communicate with the lens side. The lens unit 100 communicates with the microcomputer 40 via the communication terminals 6, 10, controls the aperture 1 via the aperture drive circuit 2 by the internal lens system control circuit 4, and passes through the AF drive circuit 3. The focus is adjusted by displacing the position of the lens 5. Further, the microcomputer 40 acquires the open aperture value and the minimum aperture value of the lens unit 100 via the communication terminals 6 and 10.

  The AE sensor 15 measures the luminance of the subject that has passed through the lens unit 100. The AF sensor 11 outputs defocus amount information to the microcomputer 40. The microcomputer 40 controls the lens unit 100 based on that. The quick return mirror 12 is instructed by the microcomputer 40 at the time of exposure, and is raised and lowered by an actuator (not shown). The photographer can confirm the focus and composition of the optical image of the subject obtained through the lens unit 100 by observing the focusing screen 13 via the pentaprism 14 and the finder 16.

  The focal plane shutter 17 is a focal plane shutter that can freely control the exposure time of the image sensor 20 under the control of the microcomputer 40. The optical filter 18 is generally composed of a low-pass filter or the like, and cuts high-frequency components of light entering from the focal plane shutter 17 and guides the subject image to the image sensor 20. The image pickup device 20 is an image pickup device in which a CCD, a CMOS, or the like is generally used, and a subject image formed on the image pickup device 20 through the lens unit 100 is photoelectrically converted and captured as an electric signal.

  The AMP circuit 21 amplifies the photographic signal with a gain corresponding to the set photographic sensitivity with respect to the captured electric signal. The A / D conversion circuit 22 converts the analog signal converted into an electric signal by the image sensor 20 into a digital signal.

  The image processing circuit 23 performs filter processing, color conversion processing, and gamma / knee processing on the image data converted into a digital signal by the A / D conversion circuit 22 and outputs the result to the memory controller 27. The image processing circuit 23 also includes a D / A conversion circuit. The image processing circuit 23 converts the image data converted into a digital signal by the A / D conversion circuit 22 and the image data input by the memory controller 27 into an analog signal and outputs the analog signal to the liquid crystal display unit 25 through the liquid crystal driving circuit 24. You can also Image processing and display processing by these image processing circuits 23 are switched by the microcomputer 40. Further, the microcomputer 40 performs white balance adjustment based on the color balance information of the photographed image.

  The liquid crystal display unit 25 is a rear monitor for displaying an image. The display is not limited to a liquid crystal display as long as it displays an image, and may be a display of another system such as an organic EL.

  The memory controller 27 stores unprocessed image data input from the image processing circuit 23 in the buffer memory 26 or stores image processed image data in the recording medium 28. Conversely, image data is fetched from the buffer memory 26 or the recording medium 28 and output to the image processing circuit 23. The memory controller 27 stores the image data sent via the external interface 29 in the recording medium 28, and conversely outputs the image data stored in the recording medium 28 to the outside via the external interface 29. It is also possible to do. Examples of the external interface include interfaces such as USB, IEEE, and HDMI (registered trademark). The recording medium 28 is a removable recording medium such as a memory card. However, it may be a built-in memory. The microcomputer 40 controls the drive timing of the image sensor 20 via the timing control circuit 32.

  The power supply control circuit 35 is a circuit that controls the power supplied from the AC power supply unit 30 or the secondary battery unit 31. In response to an instruction from the microcomputer 40, the power supply control circuit 35 turns on and off the power supply. The power supply control circuit 35 also notifies the microcomputer 40 of information on the current power supply state detected by the power supply state detection circuit 34 and information on the current power supply type detected by the power supply type detection circuit 33.

  The microcomputer 40 controls the focal plane shutter 17 via the shutter control circuit 36. The optical filter vibration control circuit 37 is a circuit that vibrates the piezoelectric element 19 connected to the optical filter 18. It vibrates according to the instruction of the microcomputer 40 so that the piezoelectric element is vibrated with predetermined values for the vibration amplitude, vibration time, and vibration axial direction. The non-volatile memory 38 is a non-volatile recording medium that stores user-set values such as shutter speed, aperture value, and shooting sensitivity, as well as various other data, even when the imaging device is not turned on. can do.

  The volatile memory 39 stores data that is desired to be temporarily stored, such as the internal state of the imaging apparatus and information on the removable recording medium 28. The operation unit 70 is various operation members as an input unit that receives an operation from a user. The operation unit 70 includes at least the following operation units. Release button 201, main electronic dial 202, sub electronic dial 203, power switch 204, protect button 205, menu button 206, delete button 207, enlargement mode button 208, playback instruction button 209, single / multi switching button 210, multi controller 211 .

The microcomputer 40 is a control unit that controls each unit included in the imaging apparatus 200. The microcomputer 40 executes various processes described later by expanding and executing the program recorded in the nonvolatile memory 38 using the volatile memory 39 as a work memory.
FIG. 2A is a diagram illustrating an appearance shape from the front of the entire imaging apparatus 200, and FIG. 2B is a diagram illustrating an appearance shape from the back of the entire imaging apparatus 200. Portions common to FIG. 1 are denoted by the same symbols.

  The release button 201 is a button for issuing a shooting preparation instruction and a shooting instruction. By pressing the button halfway, the brightness of the subject is measured or focused. Further, when the button is fully pressed, the shutter is released and an image is taken. The main electronic dial 202 is a rotation operation member, and the user rotates the main electronic dial 202 to set setting values such as a shutter speed and an aperture, and to finely adjust the enlargement magnification in the enlargement mode. The sub electronic dial 203 is a rotation operation member, and the user turns the sub electronic dial 203 to set setting values such as aperture and exposure correction, or to perform an operation of feeding one image in an image display state. Do.

  A power switch 204 is an operation member for turning the power on and off. The protect button 205 is a button for performing processing such as protection and rating on an image stored in a recording medium inside and outside the imaging apparatus. The menu button 206 is a button for displaying various setting screens on the liquid crystal display unit 25. A delete button 207 is a button for instructing deletion of an image stored in a recording medium inside or outside the imaging apparatus. The enlargement mode button 208 is a button that accepts an operation for issuing an instruction to transition to the enlargement mode (instruction to start the enlargement mode) and an instruction to exit from the enlargement mode (instruction to end the enlargement mode) in the playback state.

  The reproduction instruction button 209 is a button for causing the liquid crystal display unit 25 to display an image stored in a recording medium inside and outside the imaging apparatus. The distance measuring point selection button 210 is a button for entering a mode for selecting a distance measuring point 213 which is a start point of autofocus and an AF area 212 which is a range where autofocus is performed. The multi-controller 211 can be operated in a plurality of directions for setting a distance measuring point that is a start point of autofocus or moving an enlarged frame (enlarged range) in an enlarged image display state. It is an operation member.

[Example 1]
Hereinafter, with reference to FIGS. 3 to 7, a method for maintaining the exposure when the open aperture value and the minimum aperture value of the lens change according to the first embodiment of the present invention will be described.

  First, the basic flow of this method will be described with reference to FIGS. In step S100, it is determined whether or not there is a change in the open Av value or the minimum Av acquired from the lens unit 100. If there is a change, the process proceeds to step S101, and if there is no change, the process ends.

In step S101, it is determined whether or not the shooting mode is the manual mode. If the shooting mode is the manual mode, the process proceeds to step S102, and if not, the process ends. If the currently set Av value is smaller than the open Av value or larger than the minimum Av value in step S102, the process proceeds to step S103, and if not, the process ends. In step S103, the Bv value and Bv1 at the current set value are calculated based on the following equation (A).
Bv1 = Tv1 + setting Av−ISO1 + α (A)
Tv1 is a currently set Tv value, ISO1 is a currently set ISO value, and α is an arbitrary coefficient.

  In step S104, a setting value is acquired as to whether the Tv value is shifted or the ISO value is shifted in order to maintain the exposure. The setting can be set by selecting from the GUI image screen shown in FIG. When ISO is selected, the ISO value is shifted in order to maintain exposure, and when Tv is selected, the Tv value is shifted to maintain exposure. If you choose Never, do nothing.

  In step S105, as a result of reading in step S104, it is determined whether or not the setting is to maintain exposure by shifting Tv. If the setting is to maintain exposure by shifting Tv, step S107 is performed. If not, the process proceeds to step S106. In step S106, as a result of reading in step S104, it is determined whether or not the setting is to maintain exposure by shifting ISO. If the setting is to maintain exposure by shifting ISO, step S108 is performed. Go to, otherwise do nothing. In step S107, processing for shifting Tv is performed to maintain exposure. Details will be described later. In step S108, processing for shifting ISO is performed to maintain exposure. Details will be described later.

Next, this method will be specifically described with reference to FIGS. 4, 5, and 7. First, the case where the exposure is to be maintained by shifting the Tv value will be described with reference to FIGS. In step S200, a Tv value for maintaining exposure is calculated based on the following equation (B).
Tv2 = Bv1-open Av + ISO1-α (B-1)
Tv2 = Bv1-minimum Av + ISO1-α (B-2)
Tv2 is a Tv value for maintaining exposure.

  In step S201, the setting range of the setting Tv value is acquired. The setting can be set by selecting from the GUI image screen shown in FIGS. When set as shown in FIG. 7A, Tv values that can be set are from 1/125 to 1/250, and can be set when set as shown in FIG. 7B. The Tv value is from 1/8000 to 30 seconds. In step S202, it is determined whether Tv2 calculated in step S200 exceeds the upper limit value acquired in step S201. If it exceeds, the process proceeds to step S204, and if not, the process proceeds to step S203.

  In step S203, it is determined whether Tv2 calculated in step S200 is below the lower limit value acquired in step S201. If it is below, the process proceeds to step S205. If not, Tv2 calculated in step S200 is It is set as the set Tv value and exposure is maintained. In step S204, since Tv2 calculated in step S200 exceeds the upper limit value acquired in step S201, the upper limit value is substituted into Tv2 and set as the set Tv value. In step S205, since Tv2 calculated in step S200 is below the lower limit value acquired in step S201, the lower limit value is substituted into Tv2 and set as the set Tv value.

  Since the setting Tv is set as described above, even if the user changes the Tv value after the exposure maintaining function is activated, the setting range is not exceeded. As a result, the user can shoot without confusion. In addition, since the Tv value falls within the range desired by the user, the Tv value does not exceed the user's intention. Thus, the user can take a picture with peace of mind.

Next, the case of trying to maintain the exposure by shifting the ISO value will be described with reference to FIGS. In step S300, an ISO value for maintaining exposure is calculated based on the following equation (C).
ISO2 = Bv1−open Av−Tv1 + α (C-1)
ISO2 = Bv1-minimum Av-Tv1 + α (C-2)
ISO2 is an ISO value for maintaining exposure.

  In step S301, the setting range of the set ISO value is acquired. The setting can be made by selecting from the GUI image screen shown in FIGS. 7C and 7D. When set as shown in FIG. 7C, the settable ISO values are 1000 to 1600, and when set as shown in FIG. 7D, the settable ISO values are 100 to 12800.

  In step S302, it is determined whether ISO2 calculated in step S300 exceeds the upper limit acquired in step S301. If it exceeds, the process proceeds to step S304, and if not, the process proceeds to step S303. In step S303, it is determined whether or not ISO2 calculated in step S300 is below the lower limit value acquired in step S301. If it is below, the process proceeds to step S305. The set ISO value is set and exposure is maintained. In step S304, since ISO2 calculated in step S300 exceeds the upper limit value acquired in step S301, the upper limit value is substituted into ISO2 and set as the set ISO value. In step S305, since ISO2 calculated in step S300 is below the lower limit value acquired in step S301, the lower limit value is substituted into ISO2 and set as the set ISO value.

  Since the setting ISO is set as described above, even if the user changes the ISO value after the exposure maintenance function is activated, the setting value is not exceeded, so the setting value can be changed in order. As a result, the user can shoot without confusion. In addition, since the ISO value falls within the range desired by the user, the ISO value does not exceed the user's intention. Thus, the user can take a picture with peace of mind.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Diaphragm drive circuit 3 AF drive circuit 4 Lens system control circuit 5 Lens 6 Lens side communication part 10 Camera side communication part 11 AF sensor 12 Mirror 13 Focusing screen 14 Penta prism 15 AE sensor 16 Eyepiece unit 17 Focal plane shutter 18 Optical Filter 19 Piezoelectric element 20 Imaging element 21 AMP circuit 22 A / D conversion circuit 23 Image processing circuit 24 Liquid crystal drive circuit 25 Liquid crystal display unit 26 Buffer memory 27 Memory controller 28 External memory 29 Interface 30 AC power supply unit 31 Secondary battery unit 32 Timing Control circuit 33 Power supply type detection circuit 34 Power supply state detection circuit 35 Power supply control circuit 36 Shutter control circuit 37 Optical filter vibration control circuit 38 Non-volatile memory 39 Volatile memory 40 My Black computer 70 operation unit

Claims (5)

Upper and lower limit setting means (25) of the set TV value;
Upper and lower limit setting means (25) for the set ISO value;
A determination means (40) for determining whether or not the open aperture value or the minimum aperture value has changed;
As a result of the determination means, when there is a change, a TV value changing means (40) for changing the TV value so as to be the same as the exposure value before the change,
As a result of the determination means, when there is a change, the ISO value changing means (40) for changing the ISO value so as to be the same as the exposure value before the change, and when the determination means results in a change, Setting means (25) for setting whether to change the value or to change the ISO value;
As a result of the setting means, when the TV value is set to be changed, the TV value changing means is controlled within the range set by the upper and lower limit setting means of the set TV value, and the result of the setting means, Control means (40) for controlling the ISO value changing means within the range set by the upper and lower limit setting means for the set ISO value when the setting is to change the ISO value;
An imaging apparatus comprising: The imaging apparatus according to claim 1, wherein the setting unit sets on a GUI screen. A setting TV value upper and lower limit setting step (25);
An upper and lower limit setting step (25) of the set ISO value;
A determination step (40) for determining whether or not the open aperture value or the minimum aperture value has changed;
As a result of the determination step, when there is a change, a TV value changing step (40) for changing the TV value so as to be the same as the exposure value before the change,
As a result of the determination means, when there is a change, the ISO value changing step (40) for changing the ISO value so that it becomes the same as the exposure value before the change, and when the result of the determination step is the A setting process (25) for setting whether to change the value or to change the ISO value;
As a result of the setting step, if it was set to change the TV value, within the range set by the upper and lower limit setting step of the set TV value, the TV value changing step is controlled, the result of the setting step, If the setting is to change the ISO value, the control step (40) for controlling the ISO value changing step within the range set by the upper and lower limit setting step of the set ISO value,
And a control method for the imaging apparatus. The method according to claim 3, wherein the setting step is set on a GUI screen.   The computer program for making a computer perform the control method of the imaging device of Claim 3 or Claim 4.