JP2016126124A - Control apparatus, imaging apparatus, control method, program, and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control apparatus having an improved defocus detection accuracy.SOLUTION: A control apparatus 210 determines a focusing position of a focus lens through a focusing operation, and, subsequently using a focus detector 207, calculates a dispersion value of the defocus amount on the basis of the focus bracket photography and the detection of a plurality of focuses at shooting positions with reference to the focusing position. The control apparatus selects one image determined to be in the sharpest focus from an image group obtained by the focus bracket photography, and calculates a focus correction value used for correcting the defocus amount.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an imaging apparatus capable of automatic focus adjustment (AF) such as a single-lens reflex camera.

  In a single-lens reflex camera that has an automatic focus adjustment function (AF) using a phase difference detection method, errors such as manufacturing errors and adjustment errors are included in both the camera body and the taking lens, and a focus error larger than the allowable amount occurs. there's a possibility that. For this reason, some single-lens reflex cameras have a function (AF microadjustment) in which the user arbitrarily finely adjusts the AF focus correction value. However, at the time of AF micro-adjustment, the user needs to repeat the photographing and checking operations in order to check whether the fine adjustment result is correct.

  Patent Document 1 discloses an imaging apparatus that associates a defocus amount of a photographing lens with an image and calculates a focus correction value based on the defocus amount associated with the image that the user determines to be in focus. Yes.

JP 2005-109621 A

  However, in the imaging apparatus of Patent Document 1, an incorrect correction value is calculated due to an error factor such as a defocus detection error of a defocus amount associated with an image or an image selection error, and the defocus detection accuracy is deteriorated. There is.

  Therefore, the present invention provides a control device, an imaging device, a control method, a program, and a program with improved defocus detection accuracy.

  A control device according to an aspect of the present invention includes a calculating unit that calculates a defocus amount correction value, and the defocus amount using the correction value based on a relationship between a plurality of defocus amount variations and a predetermined threshold value. Determination means for determining whether or not to correct the focus amount.

  An imaging apparatus according to another aspect of the present invention includes an imaging element that photoelectrically converts an optical image via a lens, a focus detection unit that detects a defocus amount, and a calculation unit that calculates a correction value of the defocus amount. Determining means for determining whether or not to correct the defocus amount using the correction value based on a relationship between a plurality of defocus amount variations and a predetermined threshold value.

  According to another aspect of the present invention, there is provided a control method, comprising: calculating a defocus amount correction value; and using the correction value based on a relationship between a plurality of defocus amount variations and a predetermined threshold value. Determining whether or not to correct the focus amount.

  According to another aspect of the present invention, there is provided a program for calculating a defocus amount correction value, and using the correction value based on a relationship between a plurality of defocus amount variations and a predetermined threshold. Determining whether to correct the amount, and causing the computer to execute.

  A storage medium according to another aspect of the present invention stores the program.

  Other objects and features of the present invention are illustrated in the following examples.

  According to the present invention, it is possible to provide a control device, an imaging device, a control method, a program, and a program with improved defocus detection accuracy.

It is a schematic block diagram of the imaging device in each Example. It is explanatory drawing of the focus bracket imaging | photography operation | movement in each Example. It is a flowchart of the focus bracket photographing operation in each embodiment. It is a flowchart of the memory | storage determination operation | movement of a focus correction value in each Example. In Example 1, 2, it is explanatory drawing of the determination method of the 2nd threshold value used at the time of the memory | storage determination of a focus correction value. In Example 3, it is a screen for changing a 2nd threshold value according to the kind of imaging lens. In Example 4, it is a screen for changing a 2nd threshold value according to the kind of imaging device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, with reference to FIG. 1, the configuration of the imaging apparatus according to the first embodiment of the present invention will be described. FIG. 1 is a schematic configuration diagram of an imaging apparatus 200 (camera) in the present embodiment.

  As shown in FIG. 1, a photographing lens 100 is detachably attached to the imaging apparatus 200 of the present embodiment via a lens mounting mechanism of a mount unit (not shown). An electrical contact unit 104 is provided in the mount portion. The imaging device 200 communicates with the photographing lens 100 (lens device) via the electrical contact unit 104 to control the focus lens 101 of the photographing lens 100. In FIG. 1, only the focus lens 101 is shown as the lens of the photographing lens 100. However, in addition to the focus lens 101, a variable power lens or a fixed lens may be provided.

  A light beam from a subject (not shown) is guided to the main mirror 201 of the imaging apparatus 200 via the focus lens 101 of the photographing lens 100. The main mirror 201 is disposed obliquely with respect to the optical axis OA in the photographing optical path. The main mirror 201 is between a first position (down position shown in FIG. 1) for guiding the light beam from the subject to the upper viewfinder optical system and a second position (up position) for retreating from the photographing optical path. It is possible to move with. The central part of the main mirror 201 is a half mirror.

  When the main mirror 201 is at the first position (down position), a part of the light beam from the subject passes through the half mirror. The light beam transmitted through the main mirror 201 (half mirror) is reflected by the sub mirror 202 provided on the back side of the main mirror 201 and guided to the focus detection device 207 (focus detection means). Further, the light beam reflected by the main mirror 201 forms an image on the focus plate 203 arranged at a position optically conjugate with the image sensor 209. Light (subject image) diffused and transmitted through the focus plate 203 is converted into an erect image by the pentaprism 204. The erect image is magnified by the eyepiece 205 and observed by the user.

  On the other hand, when the main mirror 201 is in the second position (up position), the sub mirror 202 is folded with respect to the main mirror 201 and retracts out of the photographing optical path. For this reason, the light beam from the photographing lens 100 passes through the focal plane shutter 208 which is a mechanical shutter and enters the image sensor 209. The focal plane shutter 208 limits the amount of light incident on the image sensor 209. The imaging element 209 is a photoelectric conversion element such as a CCD sensor or a CMOS sensor that photoelectrically converts a subject image (optical image) formed by the photographing lens 100 to generate image data and outputs the image data (electrical signal). is there.

  Reference numeral 210 denotes a control device (control means) that controls various calculations and various operations in the imaging apparatus 200. The control device 210 is responsible for overall control of the imaging device 200, is configured by a CPU, an MPU, and the like, and controls operations of circuits and the like described later. In the present embodiment, the control device 210 includes a calculation unit 210a and a determination unit 210b. The calculating unit 210a calculates a defocus amount correction value. The determination unit 210b determines whether or not to correct the defocus amount using a correction value based on a predetermined threshold (first threshold, second threshold).

  The control device 210 communicates with the lens control circuit 103 in the taking lens 100 via the electrical contact unit 104. The lens control circuit 103 controls the lens driving mechanism 102 that performs focusing by driving the focus lens 101 in the direction (optical axis direction) along the optical axis OA in accordance with a signal from the control device 210. . The lens driving mechanism 102 has a stepping motor as a driving source. The control device 210 also includes an EEPROM 211 (storage means) that stores parameters that need to be adjusted when controlling the imaging device 200, camera identification information for performing individual identification of the imaging device 200, adjustment values of parameters related to imaging, and the like. Is connected.

  The display device 212 (display means) is a device that displays image data captured by the image sensor 209 and displays items set by the user, and is generally configured to include a color liquid crystal display element. The The control device 210 is connected to an operation detection unit 213 for transmitting a user's intention to the imaging device 200 and a counter 214. The operation detection unit 213 detects operations such as a release button (not shown), a selection button, and a button for selecting one of a plurality of images obtained by focus bracket photographing described later. The counter 214 is a counter for counting the number of shootings when performing bracket shooting. The count value reset of the counter 214 is performed by the control device 210.

  The lens control circuit 103 receives performance information such as a focal length and an open aperture value of the photographing lens 100, a lens ID (lens identification information) for identifying the photographing lens 100, and information received from the control device 210 through communication. A memory (not shown) for storing is provided. The performance information and the lens ID of the photographing lens 100 are transmitted from the lens control circuit 103 to the control device 210 by initial communication when the photographing lens 100 is attached to the imaging device 200. The control device 210 stores the performance information and the lens ID received from the lens control circuit 103 in the EEPROM 211.

  Next, with reference to FIG. 2, bracket shooting by the image pickup apparatus 200 in the present embodiment will be described. FIG. 2 is an explanatory diagram of the bracket shooting operation (focus bracket shooting operation) in the present embodiment. In FIG. 2, vertical arrows 301 to 310 indicate the driving direction and driving amount of the photographing lens 100. A broken line 300 in FIG. 2 indicates a focus position. The imaging apparatus 200 moves (drives) the lens by a predetermined amount in one direction (closest side or infinity side) from the in-focus position indicated by the broken line 300, and starts with the position after moving by the predetermined amount as a starting point. The lens is driven by a predetermined amount. In this embodiment, the predetermined amount is a total of nine times of arrows 302 to 310, but is not limited to this. An arrow 301 indicates a driving amount that is five times the driving amount indicated by the arrows 302 to 306 on the closest side. For this reason, it is ideal that control is performed so as to return to the original in-focus position indicated by the broken line 300 after being driven by the drive amount indicated by the arrows 302 to 306. As a result, the same drive amount (arrows 302 to 306 and arrows 307 to 310) is assigned to both the near side and the infinite side with respect to the first in-focus position (broken line 300).

  Usually, the driving amount indicated by the arrow 301 is determined based on the focusing width of the lens, and is set to, for example, twice or three times the focusing width of the lens. If this drive amount is too large, the focus change becomes rough. On the other hand, if the drive amount is small, the change in focus is too small, and it is difficult to select and narrow down one image in a later process. Lines 311 to 319 in FIG. 2 indicate positions where the photographing operation is performed. That is, the imaging apparatus 200 is driven by the same amount of driving (arrows 302 to 306 and arrows 307 to 310) on both the near side and the infinite side with respect to the first in-focus position (broken line 300). Take a picture at the position and select the most focused image later.

  Next, the focus bracket photographing operation will be described in detail with reference to FIG. FIG. 3 is a flowchart of the focus bracket photographing operation. Each step of FIG. 3 is mainly executed by the calculation unit 210a or the determination unit 210b based on a command from the control device 210.

  First, in step S101, the control device 210 performs a focusing operation, for example, focusing at a focusing position indicated by a broken line 300 in FIG. Subsequently, in step S102, the control device 210 performs focus detection a plurality of times at the in-focus position determined in step S101 using the focus detection device 207, and distributes the defocus amount based on the plurality of focus detection results. A value (variation) is calculated.

  Subsequently, in step S103, the control device 210 determines whether or not the defocus amount dispersion value (variation) calculated in step 102 is less than a first threshold value. When the dispersion value of the defocus amount is less than the first threshold value, the process proceeds to step S104. In step S104, the control device 210 resets the counter 214 (that is, sets the count value n = 0).

  Subsequently, in step S106, the control device 210 drives the focus lens 101 to the focus bracket start position via the lens control circuit 103 and the lens drive mechanism 102. Eventually, in step S115, which will be described later, one image that is determined to be the best in focus is selected from the image group obtained by focus bracket photography. At this time, in order to include an in-focus image, it is preferable to perform focus bracket photographing with reference to the in-focus position determined by the imaging device 200 (control device 210). When focus bracket shooting is performed with the bracket interval based on the lens focus width set to s and the number of bracket shots set to m (m = 9 in FIG. 2), the focus bracket start position is {s × (M-1)} / 2 is a position in the closest direction. By driving the lens to this position, it is possible to perform focus bracket photographing with reference to the in-focus position determined by the imaging apparatus 200.

  Subsequently, in step S107, the control device 210 uses the focus detection device 207 to detect (calculate) the defocus amount at the lens position (position of the focus lens 101) driven in step S106. At this time, the control device 210 may perform defocus detection a plurality of times, and an average value of the detection results may be used as the defocus amount. In step S108, the control device 210 performs shooting (still image shooting) using the image sensor 209. The control device 210 stores the image captured in step S108 in the internal memory in association with the defocus amount detected in step S107.

  Subsequently, in step S109, the control device 210 increments the count value n of the counter 214 to 1 (n = 1). In step S110, the control device 210 drives the focus lens 101 by the amount of the bracket interval s via the lens control circuit 103 and the lens driving mechanism 102. Subsequently, in step S111, the control device 210 uses the focus detection device 207 to detect the defocus amount at the lens position driven in step S110. In step S112, the control device 210 performs shooting (still image shooting) using the image sensor 209. The control device 210 stores the image captured in step S112 in the internal memory in association with the defocus amount detected in step S111.

  Subsequently, in step S113, the control device 210 increments the count value n of the counter 214 by one (n = n + 1). In step S114, the control device 210 determines whether or not the count value n of the counter 214 has reached the bracket shooting number m (n = m?). If the count value has reached the number m of bracket shots (n = m), the process proceeds to step S115. On the other hand, if the count value n has not reached the number m of bracket shots (n <m), the process returns to step S110 and steps S110 to S114 are repeated.

  In step S115, an image (focus correction image) is selected by the user. Here, a focus correction image obtained by focus bracket shooting is displayed on the display device 212. Then, the user selects one focus correction image that is determined to be in focus from the focus correction images displayed on the display device 212.

  Subsequently, in step S116, the control device 210 calculates a correction value (focus correction value). In this embodiment, the control device 210 calculates a focus correction value based on the defocus amount stored in the internal memory in association with the focus correction image selected by the user in step S115. Then, the process proceeds to step S117, and this flow ends. The focus correction value calculated in step S116 is used when correcting the defocus amount of the photographing lens 100 detected by the focus detection device 207.

  On the other hand, when the variance value of the defocus amount calculated in step S102 is greater than or equal to the first threshold value in step S103, the process proceeds to step S105. In step S105, the control device 210 stops focus bracket shooting and proceeds to step S117. If the dispersion value of the defocus amount calculated in step S102 is large (greater than or equal to the first threshold value), the defocus amount changes greatly every time focus is detected, and the focus is adjusted in step S101. This means that the reliability of the focus detection result for the subject is low. If the reliability of the focus detection result for the subject is low, the reliability of the focus correction value calculated by performing the focus bracket photographing after step S104 is also low, and the correct defocus amount cannot be corrected. Therefore, in this case, the control device 210 stops focus bracket shooting. Preferably, the control device 210 cancels the focus bracket shooting, displays the stop of the focus bracket shooting on the display device 212, and notifies the user that the bracket shooting is not performed.

  Next, with reference to FIG. 4, a memory determination operation for the focus correction value (the correction value calculated in step S116 in FIG. 3) used for correcting the defocus amount will be described. FIG. 4 is a flowchart of the focus correction value storage determination operation. Each step of FIG. 4 is mainly executed by the determination unit 210b based on a command from the control device 210.

  First, in step S201, the control device 210 determines whether or not a focus correction value has been calculated in focus bracket shooting (step S116 in FIG. 3). When the focus correction value has not been calculated (when focus bracket shooting is stopped), the process proceeds to step S205, and this flow ends. On the other hand, when the focus correction value is calculated, the process proceeds to step S202.

  In step S202, the control device 210 determines whether or not the focus correction value is less than the second threshold value. When the focus correction value is less than the second threshold value, the process proceeds to step S203, and the control device 210 does not store the focus correction value in the EEPROM 211 (storage means). On the other hand, when the focus correction value is greater than or equal to the second threshold value, the process proceeds to step S204, and the control device 210 stores the focus correction value in the EEPROM 211. The process proceeds to step S205 via step S203 or step S204, and this flow is terminated.

  When performing the focus bracket adjustment, error factors such as a defocus detection error and a user image selection error are included. For this reason, within the range of the error, an incorrect focus correction value may be calculated by applying the focus correction value, and the defocus detection accuracy may deteriorate. In this embodiment, in order to reduce the possibility of such deterioration in accuracy, a threshold value (second threshold value as a correction threshold value) that is approximately the same as a value that is assumed to vary the focus correction value due to an error is set in advance. Keep it. Thereby, the possibility of defocus detection accuracy degradation can be reduced by the focus correction value calculated by the imaging apparatus 200 (control apparatus 210).

  Next, referring to FIG. 5, a method for determining a second threshold value (second threshold value used in the determination in step S <b> 202 in FIG. 4) serving as a criterion for determining whether or not to store the focus correction value. explain. FIG. 5A is an explanatory diagram of a method for determining the second threshold value. FIG. 5B shows a case where the defocus amount dispersion value (variation) is smaller than that in FIG. 5A, and FIG. 5C shows a defocus amount dispersion value (variation) compared to FIG. Each shows a large case.

  In FIG. 5A, 401 is a focus position that is a reference position of the focus bracket determined by the control device 210. Reference numeral 402 denotes a focus correction value calculated by the control device 210 (calculation means 210a). Reference numeral 403 denotes a second threshold value. When the focus correction value 402 is within the range of the second threshold 403 (less than the second threshold), the control device 210 does not store the focus correction value in the EEPROM 211 (storage means). On the other hand, when the focus correction value 402 is outside the range of the second threshold 403 (is greater than or equal to the second threshold), the control device 210 stores the focus correction value 402 in the EEPROM 211. The second threshold is a value that can be arbitrarily changed. The control device 210 according to the present exemplary embodiment determines the second threshold 403 based on the defocus amount dispersion value obtained by performing focus detection a plurality of times at the in-focus position 401.

  FIG. 5B is an explanatory diagram when the dispersion value of the defocus amount obtained by performing focus detection a plurality of times at the in-focus position 401 is small (when it is smaller than FIG. 5A). A small defocus amount dispersion value indicates a small defocus detection error. In this case, the possibility that the defocus detection accuracy is deteriorated by applying the focus correction value is low. Therefore, the control device 210 determines a second threshold 404 having a narrower width (smaller range) than the second threshold 403 shown in FIG.

  FIG. 5C is an explanatory diagram when the dispersion value of the defocus amount obtained by performing focus detection a plurality of times at the in-focus position 401 is large (larger than FIG. 5A). A large defocus amount variance value indicates a large defocus detection error. In this case, there is a high possibility that the defocus detection accuracy is deteriorated by applying the focus correction value. Therefore, the control device 210 determines a second threshold value 405 that is wider (having a larger range) than the second threshold value 403 shown in FIG. In this embodiment, the dispersion value of the defocus amount, which is a reference when determining the second threshold value, becomes a reference when determining whether or not to stop focus bracket shooting in step S103 of FIG. It is smaller than the first threshold value.

  Next, a second embodiment of the present invention will be described. The present embodiment is different from the first embodiment in the method of determining the second threshold value (second threshold value used in the determination in step S202 of FIG. 4) as a reference for determining whether or not to store the focus correction value. Different. Since other configurations and methods are the same as those in the first embodiment, description thereof will be omitted.

  In this embodiment, the control device 210 is obtained by performing focus detection a plurality of times at a focus position where a focus correction value based on a single image selected by the user from a group of images taken with focus bracketing is calculated. The second threshold value is determined according to the variation in the defocus amount. Here, when the dispersion value (variation) of the defocus amount is small, it indicates that the defocus detection error is small, and it is unlikely that the defocus detection accuracy is deteriorated by applying the focus correction value. In this case, the control device 210 determines the second threshold 404 having a narrow width (small range) as shown in FIG.

  On the other hand, when the dispersion value (variation) of the defocus amount is large, it indicates that the defocus detection error is large, and there is a high possibility that the defocus detection accuracy is deteriorated by applying the focus correction value. In this case, the control device 210 determines a second threshold 405 having a wide width (a large range) as shown in FIG. In this embodiment, the dispersion value of the defocus amount, which is a reference when determining the second threshold value, becomes a reference when determining whether or not to stop focus bracket shooting in step S103 of FIG. It is smaller than the first threshold value.

  Next, Embodiment 3 of the present invention will be described with reference to FIG. In the present embodiment, the second threshold value (second threshold value used in the determination in step S202 of FIG. 4) serving as a reference for storing the focus correction value is set as the photographing lens 100 (focus lens). This is different from the above-described embodiments in that it is determined according to the type. Other configurations and methods are the same as those of the above-described embodiments, and thus description thereof is omitted.

  FIG. 6 is a screen for changing the second threshold according to the type of the lens (photographing lens 100). FIG. 6A is a screen when all lens uniform adjustment is selected in the focus bracket adjustment menu (first mode). When the first mode is selected, the focus bracket can be adjusted uniformly regardless of the type of lens.

  In the all-lens uniform adjustment mode, the focus bracket can be adjusted uniformly with various focus lenses. The focus lens includes a focus lens in which an error in a position where the focus lens is actually driven is large with respect to an input position command signal. In focus bracket adjustment performed using a focus lens with relatively poor controllability as described above, there is a high possibility that the obtained focus correction value is not the correct focus correction value. For this reason, if the focus correction is easily performed, the focus accuracy is likely to deteriorate. Therefore, in the all-lens uniform adjustment mode, the width of the second threshold is set wide. As a result, even when the focus correction value is calculated, control can be performed so that the focus correction is not easily performed.

  FIG. 6B shows a second mode in which the focus can be adjusted for each type of focus lens in the focus bracket adjustment menu. In the second mode, since the focus bracket adjustment of the focus lens that the user intentionally wears is performed individually, focus correction may be possible based on the image selected by the user regardless of the controllability of the focus lens. preferable. At this time, the width of the second threshold is set to be narrow so that the focus correction can be executed with the image selected by the user as much as possible.

  Next, Embodiment 4 of the present invention will be described with reference to FIG. In the present embodiment, the second threshold value (second threshold value used in the determination in step S202 in FIG. 4) serving as a reference for determining whether or not to store the focus correction value is set according to the type of the imaging apparatus 200. It is different from the above-described embodiments in that it is determined by the above. Other configurations and methods are the same as those of the above-described embodiments, and thus description thereof is omitted.

  FIG. 7 is a screen for changing the second threshold value (setting width) according to the type of the imaging apparatus 200. As shown in FIG. 7, in this embodiment, the class (type) of the imaging apparatus 200 is set to the second threshold setting width (“narrow”, “default setting”, “wide” depending on professional, middle, and entry. )) Respectively.

  When the type (model class) of the imaging apparatus 200 is an entry system, the setting range of the second threshold is narrowed. In general, a user who uses a professional-type camera is a user who can strictly evaluate the focus accuracy and is strict in evaluating the focus accuracy. For this reason, there is little error in selecting an image that is in focus from the group of images taken with focus bracketing. Therefore, in the case of a professional camera, the setting range of the second threshold is set narrow so that the focus correction can be easily performed with the image selected by the user.

  On the other hand, a user who uses an entry camera is not strict in evaluating the focus accuracy compared to a professional camera user. For this reason, there is a large error in selecting an image that is in best focus from a group of images taken with focus bracketing. In this case, the image selected by the user is often not the image at the correct focus position. For this reason, if the focus correction is performed with the focus correction value of the image selected by the user, the focus accuracy is likely to deteriorate. Therefore, in the present embodiment, in the case of an entry-type camera, the focus correction is not easily performed by setting the width of the second threshold value wide.

  A user who uses a middle camera is a user positioned between a professional user and an entry user. For this reason, it is assumed that the evaluation of the focus accuracy is also an intermediate severity between the professional user and the entry user, and the width of the second threshold is preferably set to an intermediate width between both classes. In the present embodiment, the second threshold value is not limited to the configuration preset in the imaging device 200 according to the type (class) of the imaging device 200, and can be arbitrarily set from the application. May be.

  Thus, in each embodiment, the control device 210 includes a calculation unit 210a and a determination unit 210b. The calculating unit 210a calculates a correction value (focus correction value) of the defocus amount (an evaluation value based on focus detection). The determination unit 210b determines whether or not to correct the defocus amount using the correction value based on the relationship between the variation in the plurality of defocus amounts and a predetermined threshold (first threshold, second threshold). To do. Preferably, when the determination unit 210b determines to correct the defocus amount using the correction value, the correction unit 210b stores the correction value in the storage unit (EEPROM 211). On the other hand, when the determination unit 210b determines not to correct the defocus amount using the correction value, the determination unit 210b does not store the correction value in the storage unit.

  Preferably, the determination unit 210b performs bracket shooting according to a relationship between a plurality of defocus amount variations obtained at a predetermined lens position (a position of the focus lens 101) and a first threshold value as a predetermined threshold value. It is determined whether or not to execute (S103). More preferably, the determination unit 210b notifies the user that bracket shooting is not executed when the variation in the plurality of defocus amounts exceeds the first threshold (S105).

  Preferably, the determination unit 210b changes the second threshold value as the predetermined threshold value according to variations in the plurality of defocus amounts obtained at the predetermined lens position. More preferably, the determination unit 210b narrows the dead zone width (second threshold setting width) determined by the second threshold as the variation in the plurality of defocus amounts is smaller. Preferably, the predetermined lens position is a lens position determined to be a focus position.

  Preferably, the plurality of defocus amount variations are obtained when the calculation unit 210a calculates the correction value. More preferably, the correction value is a correction value (first correction value) calculated based on one image selected from a plurality of images obtained by bracket shooting. Then, the determination unit 210b changes the second threshold value according to the variation in the plurality of defocus amounts obtained at the lens position where the first correction value is calculated.

  Preferably, the determination unit 210b changes the second threshold according to the type of the lens (the photographic lens 100). More preferably, the determination unit 210b has a first mode in which the second threshold is constant (a mode in which adjustment is performed uniformly for all lenses) and a second mode in which the second threshold is changed according to the type of lens. 2 modes (modes in which adjustment is performed for each lens). More preferably, the determination unit 210b narrows the dead zone width (second threshold setting width) determined by the second threshold value in the second mode, as compared to the first mode. .

  Preferably, the determination unit 210b changes the second threshold according to the type of the imaging device 200. More preferably, the second threshold value can be arbitrarily set on the application.

(Other examples)
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

  According to each embodiment, it is possible to provide a control device, an imaging device, a control method, a program, and a program with improved defocus detection accuracy.

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

210 Controller 210a Calculation unit 210b Determination unit

Claims (18)

A calculating means for calculating a defocus amount correction value;
And a determination unit that determines whether to correct the defocus amount using the correction value based on a relationship between a plurality of defocus amount variations and a predetermined threshold value. . The determination means includes
When it is determined that the defocus amount is corrected using the correction value, the correction value is stored in a storage unit;
The control device according to claim 1, wherein when it is determined that the defocus amount is not corrected using the correction value, the correction value is not stored in the storage unit.   The determination unit determines whether or not to perform bracket shooting according to a relationship between the variation in the plurality of defocus amounts obtained at a predetermined lens position and the first threshold value as the predetermined threshold value. The control device according to claim 1, wherein:   4. The control device according to claim 3, wherein the determination unit notifies the user that the bracket photographing is not executed when a variation in the plurality of defocus amounts exceeds the first threshold value. 5.   5. The method according to claim 1, wherein the determination unit changes the second threshold value as the predetermined threshold value according to variations in the plurality of defocus amounts obtained at a predetermined lens position. The control device according to claim 1.   The control device according to claim 5, wherein the determination unit narrows the width of the dead zone determined by the second threshold as the variation in the plurality of defocus amounts is smaller.   The control device according to claim 5, wherein the predetermined lens position is a lens position determined to be an in-focus position.   The control device according to claim 5, wherein the variation in the plurality of defocus amounts is obtained when the calculation unit calculates the correction value. The correction value is a first correction value calculated based on one image selected from a plurality of images obtained by bracket shooting,
9. The determination unit according to claim 8, wherein the determination unit changes the second threshold value according to variations in the plurality of defocus amounts obtained at the lens position where the first correction value is calculated. The control device described.   The control device according to claim 5, wherein the determination unit changes the second threshold according to a type of lens. The determination means includes
A first mode in which the second threshold is constant;
The control device according to claim 10, further comprising: a second mode in which the second threshold value is changed according to a type of the lens.   The said determination means narrows the width | variety of the dead zone determined by the said 2nd threshold value in the case of the said 2nd mode compared with the case of the said 1st mode. Control device.   The control device according to claim 5, wherein the determination unit changes the second threshold according to a type of the imaging device.   The control device according to claim 13, wherein the second threshold value can be arbitrarily set on an application. An image sensor that photoelectrically converts an optical image via a lens;
Focus detection means for detecting a defocus amount;
Calculating means for calculating a correction value of the defocus amount;
An image pickup apparatus comprising: a determination unit configured to determine whether to correct the defocus amount using the correction value based on a relationship between a plurality of defocus amount variations and a predetermined threshold value. . Calculating a defocus amount correction value;
And determining whether to correct the defocus amount using the correction value based on a relationship between a plurality of defocus amount variations and a predetermined threshold value. Calculating a defocus amount correction value;
Determining whether to correct the defocus amount using the correction value based on a relationship between a plurality of defocus amount variations and a predetermined threshold value. program.   A storage medium storing the program according to claim 17.