JP7527792B2 - Image capture device and method for controlling image capture device - Google Patents

Description

The present invention relates to an imaging device and a control method for the imaging device, and in particular to an imaging device and a control method for moving a focus lens in conjunction with the movement of a zoom lens.

Conventionally, in video cameras and the like, when zooming using a zoom lens, the focus lens is moved to compensate for the image plane movement that accompanies the movement of the zoom lens, and a so-called zoom tracking operation is often performed to maintain a focused state. The zoom tracking operation is performed by moving the position of the focus lens along a cam trajectory curve (trajectory data) stored in memory.

Furthermore, simply using the trajectory data described above will result in errors between the design value of the cam trajectory and the focusing position during actual operation due to individual variations in the lens barrel, so a tracking adjustment is performed to correct the errors for each lens before shipping from the factory. In the tracking adjustment, the reference positions of the zoom lens and focus lens in the trajectory data are saved as adjustment values.

If the lens barrel is subjected to shock, vibration, deterioration over time, or a sudden change in temperature, the positions of the imaging optical system, the imaging element, and the detection sensor (photointerrupter (PI)) that detects the position of the zoom lens and focus lens will change. These changes can cause the positional relationship between the zoom lens and focus lens that actually achieves focus to change from the adjusted trajectory data. This can result in a decrease in focus accuracy during zooming operations.

Patent document 1 proposes correcting the back focus adjustment value based on the amount of change from a reference focus lens position when certain conditions are met.

JP 2014-228695 A

However, the method disclosed in Patent Document 1 may not be able to deal with a decrease in focus accuracy during zooming, depending on the cause of the difference between the actual focus position and the focus position indicated by the trajectory data. The method disclosed in Patent Document 1 uses back focus adjustment, so it can correct changes in the lens barrel that affect the position of the image sensor and the reference position of the focus lens. However, it cannot perform appropriate corrections when there are changes in the imaging optical system that affect the shape of the trajectory data or the reference position of the zoom lens. If the position of the focusing focus lens changes due to a change in the imaging optical system or the reference position of the zoom lens, the focus will shift again when the zoom position is changed, even if the reference position of the focus lens is corrected. This means that zoom tracking cannot be performed correctly, and the angle of view will also shift.

The present invention aims to provide an imaging device that can reduce the decrease in focus accuracy during zooming, even if the stored trajectory data deviates from the actual focus position due to various factors.

An imaging device according to the present invention includes an imaging element that photoelectrically converts an image of a subject captured by an imaging optical system having a zoom lens and a focus lens, a storage means that stores trajectory data indicating a positional relationship between the zoom lens and the focus lens when the imaging optical system is focused on a predetermined subject distance, an adjustment value acquisition means that acquires an adjustment value for adjusting the trajectory data, and a focus control means that controls the driving of the focus lens based on the trajectory data and the adjustment value acquired by the adjustment value acquisition means during a zoom operation,
The adjustment value acquisition means acquires a first focus degree when the position of the zoom lens in the trajectory data is a first position, and a second focus degree when the position of the zoom lens in the trajectory data is a second position, the first position being an intermediate position in the trajectory data and the second position being a position on the WIDE side of the first position, and determines an acquisition process to be executed from a plurality of acquisition processes for acquiring the adjustment value based on the first focus degree and the second focus degree , and acquires the adjustment value based on the determined acquisition process.

The present invention provides an imaging device that can reduce the decrease in focus accuracy during zooming.

1 is a configuration diagram of an imaging device according to a first embodiment of the present invention. 11 is a conceptual diagram showing the relationship between the zoom position and the focus position according to the subject distance. FIG. 11 is a conceptual diagram showing an example of focus in-focus information. 5 is a conceptual diagram showing an example of a tracking trajectory when the imaging optical system is changed in the first embodiment of the present invention. FIG. FIG. 11 is a conceptual diagram showing an example of a tracking trajectory when an image sensor is changed in the first embodiment of the present invention. 4 is a flowchart of detection control and correction control in the first embodiment of the present invention. 1 is a flowchart of a change factor analysis in the first embodiment of the present invention. FIG. 11 is a configuration diagram of an imaging device according to a second embodiment of the present invention. 11A and 11B are conceptual diagrams showing changes in trajectory data when the reference position of the focus lens is shifted. 11A and 11B are conceptual diagrams showing changes in trajectory data when the reference position of the zoom lens is shifted. FIG. 11 is a conceptual diagram showing an example of angle of view difference information in the second embodiment of the present invention. FIG. 11 is a conceptual diagram showing an example of angle of view feature amount information in the second embodiment of the present invention. 10 is a flowchart showing a process for registering reference data according to the second embodiment of the present invention. 10 is a flowchart of focus/zoom position deviation correction control in the second embodiment of the present invention. 10 is a flowchart of a zoom position deviation amount detection process according to the second embodiment of the present invention. 10 is a flowchart of a focus position deviation amount detection process according to the second embodiment of the present invention. 13 is a diagram illustrating an example of a tracking correction application in the third embodiment of the present invention. FIG. 11 is a configuration diagram of an imaging device according to a fourth embodiment of the present invention. FIG. 13 is a conceptual diagram showing an example of automatic setting of the angle of view in the fourth embodiment of the present invention. 13 is an example of a data table handled in automatic setting of the angle of view in the fourth embodiment of the present invention. 13 is a control flowchart of a maintenance mode in the fourth embodiment of the present invention. 13 is a flowchart of a view angle adjustment control in a fourth embodiment of the present invention. 13 is an example of a maintenance setting application in the fifth embodiment of the present invention.

The following describes in detail an embodiment of the present invention with reference to the accompanying drawings. Note that in each drawing, the same reference numbers are used for the same components, and duplicate descriptions will be omitted.

In this embodiment, based on the stored trajectory data, the positions of the zoom lens and the focus lens, and the actual focus level at the position, it is estimated how the actual focus position has changed from the stored trajectory data. Then, based on the estimation result, a method for obtaining the adjustment value is selected. For example, it is estimated whether a curve obtained by plotting the actual focus position at the zoom lens position and the focus lens position in the same manner as the trajectory data will be a curve offset from the trajectory data, or a curve with a different shape (curvature or slope) from the curve indicated by the trajectory data. If it is estimated to be an offset curve, a method for obtaining the adjustment value based on the offset value is selected, and if it is estimated to be a curve with a different shape, a method is selected so that a different adjustment value is set for each position of the zoom lens. An example in which the subject distance is used instead of the focus level is also described.

Figure 1 is a diagram showing the configuration of an imaging device 100 according to this embodiment. The imaging device 100 according to this embodiment includes an imaging optical system 110.

The imaging optical system 110 is composed of multiple optical elements and forms an optical image of an object (subject). The imaging optical system 110 of this embodiment has a zoom lens (variable magnification lens) 1 that is moved in the optical axis direction to change the focal length, a focus lens 2 that is moved in the optical axis direction to adjust the focus, and an aperture unit 3 that adjusts the amount of light. Although one zoom lens 1 and one focus lens 2 are shown in FIG. 1, each can also be configured with two or more groups.

The optical image formed by the imaging optical system 110 is photoelectrically converted by the imaging element 6 via a band-pass filter 4 (hereinafter, BPF) and a color filter 5. Although not shown in FIG. 1, optical elements such as the BPF 4 are configured to be retractable from the optical path of the imaging optical system 110.

The electrical signal (video signal) output from the image sensor 6 is gain-adjusted by the AGC (automatic gain control) 7, A/D converted by the A/D converter 8, and then input to the camera signal processing unit 9. The camera signal processing unit 9 performs various image processing operations, outputs the signal as a video signal to the communication unit 10, and calculates an evaluation value required for autofocus operation from the video signal.

The cam trajectory/depth data storage unit 11 has a memory that stores trajectory data corresponding to multiple subject distances, and acquires trajectory data to be used for zoom tracking operation based on the stored trajectory data and the current positions of the focus lens and zoom lens. The trajectory data to be used for zoom tracking operation is cam trajectory data that corresponds to the current subject distance and the positions of the focus lens and zoom lens. The cam trajectory/depth data storage unit 11 also acquires depth of field information according to the zoom position.

Figure 2 shows an example of a cam trajectory indicated by the trajectory data stored in memory. The horizontal axis indicates the position of the zoom lens, and the vertical axis indicates the position of the focus lens. Each curve in the figure indicates a cam trajectory that plots the positional relationship between the zoom lens and focus lens for focusing a subject image at the same subject distance onto the imaging element. By controlling the positions of the zoom lens and focus during zooming so that they follow this cam trajectory, it is possible to perform zooming control while keeping the focus position fixed. The memory stores such cam trajectories as table data.

However, storing a table showing the cam trajectory for each fine-grained subject distance in memory would require a huge amount of memory capacity. Therefore, only table data corresponding to the cam trajectories for several reference subject distances is stored in memory. Cam trajectories for subject distances other than the reference are obtained from the internal division ratio of the cam trajectory information on the close-up side and the infinity side using the reference cam trajectory data and position information of the focus lens and zoom lens, and this is temporarily stored. In this way, the cam trajectory/depth data storage unit 11 functions as a storage means for storing trajectory data that shows the change in the position of the focus lens that becomes the in-focus position according to the subject distance and the position of the zoom lens.

The initial adjustment data storage unit 12 stores the reference positions and adjustment values of the zoom lens and focus lens that were adjusted (initial adjustment) before shipping from the factory. The adjustment value is the difference between the trajectory data stored in the cam trajectory/depth data storage unit 11 and the trajectory actually measured before shipping. The trajectory data stored in the cam trajectory/depth data storage unit 11 is the trajectory data before the initial adjustment, and by applying the adjustment value obtained by the initial adjustment to this, the trajectory data after the initial adjustment can be obtained. The initial adjustment value is written to the initial adjustment data storage unit 12 via the zoom/focus control unit 16 from the communication unit 10 by issuing a communication command from the monitoring device 20 on the factory process line. In the lens initialization process after the power is turned on, the imaging device uses the HIGH/LOW switching position of each lens PI as the reference position. Once the reference position is determined, the distance to the WIDE end and TELE end of the zoom lens is known, and the distance to the NEAR end and FAR end of the focus lens is known, so control can be performed according to the cam trajectory shown in Figure 2.

The distance measurement device 19 measures the distance to the subject, and passes distance information to the zoom/focus control unit 16 via the communication unit 10. In FIG. 1, the distance measurement device 19 is arranged as an external device, but the distance measurement means may be built into the imaging device, such as a lens barrel. If the imaging device is equipped with a distance measurement means, the distance measurement means functions as the distance information acquisition means, and if distance information is acquired from an external device via the communication unit 10, the communication unit 10 functions as the distance information acquisition means. Note that adjustment of the cam trajectory using the distance information acquired from the distance measurement device 19 will be explained in a modified example of this embodiment, but if distance information is not used, the distance measurement device is not necessary.

The trajectory change detection unit 13 acquires cam trajectory data, control information for the zoom lens and the focus lens, and the focus degree, and detects trajectory changes and estimates how the trajectory has changed based on these data. The data used by the trajectory change detection unit 13 to detect trajectory changes is stored in the detection data storage unit 14. The data used for this detection can be data linking each lens position with the focus degree, or distance information acquired from the distance measurement device 19. In addition to this, data such as temperature information and driving time may be stored. Figure 3 is an image diagram showing the focus frame. W1, W2, and W3 are the focus AF frames, and the focus evaluation value is calculated from the brightness difference (contrast) of the brightness signal in the area within the frame. The evaluation value may utilize the peak value or the integrated value within the area. In either case, the higher the contrast, the higher the evaluation value, and the focus of the image approaches the in-focus state. The lower the contrast, the lower the evaluation value, and the focus of the image tends to become blurred. The focus degree is calculated using this evaluation value. As long as the focus degree is high when the evaluation value is high and the focus degree is low when the evaluation value is low, the calculation method is not particularly important. Here, as an example, the luminance difference normalized to a range of 0 to 100 is used as the focus rate and is utilized as the detection data. The focus evaluation value and focus degree obtained by the AF frame can be used as focus information. In addition, when the trajectory change detection unit 13 detects a change in the trajectory data, it acquires an adjustment value by an acquisition method of an adjustment value according to the change factor, and stores the acquired adjustment value in the trajectory adjustment data storage unit 15. Here, the manner in which the trajectory changes according to the change factor of the trajectory will be explained with reference to FIG. 4 and FIG. 5. FIG. 4 shows the change in the trajectory when the position of the image sensor changes, and FIG. 5 shows the change in the trajectory when the position of the lens constituting the image pickup optical system changes. In FIG. 4 and FIG. 5, the cam trajectory indicated by R1 indicates the cam trajectory immediately after adjustment. R2 in FIG. 4 is the cam trajectory when the position of the lens that constitutes the imaging optical system is changed, and the difference between the focus positions of WIDE and TELE is large compared to R1, and the difference changes to become smaller around the midpoint between WIDE and TELE, and the slope of the curve is different from R1. Note that the magnitude of this difference is related to the lens sensitivity, so not all of them will be like R2. R3 in FIG. 5 is the cam trajectory when the position of the imaging element is changed, and the overall focus position appears to be offset regardless of the position of the zoom lens. In this way, when the cam trajectory changes from the cam trajectory immediately after adjustment, the shape of the cam trajectory after the change will differ depending on the factor of the change, so in this embodiment, the factor of the change or the shape of the cam trajectory after the change is estimated, and the method of obtaining the adjustment value is selected based on the estimated result.

In FIG. 4, R4 is the cam locus used for lens control when the lens is focused at the TELE end. When the zoom lens position is driven in the WIDE direction from the state focused at the TELE end, the focus lens position is driven along R4. However, since the actual focus position is on the curve R2, the focus state can be maintained up to the intermediate position indicated by d1, but when driven further in the WIDE direction, the difference with the focus lens position that actually indicates the focus gradually increases, and a difference of d2 appears at the WIDE end. Similarly, in FIG. 5, R5 is the cam locus used for lens control when the lens is focused at the TELE end, and when the zoom lens position is driven in the WIDE direction from the state focused at the TELE end, the focus lens position is driven along R5. Since the actual focus position is on the curve R3, a difference of d3 occurs at the intermediate position, and a difference of d4 occurs at the WIDE end. When the difference between the focus lens position that actually indicates focus and the focus lens position on the cam trajectory is small, such as d1, the degree of focus is high, and when the difference is large, such as from d2 to d4, the degree of focus is low. Therefore, by detecting whether the degree of focus is high from the TELE to the intermediate position and decreases as the focus approaches the WIDE end, or whether the degree of focus is low from the TELE to the WIDE as a whole, it is possible to estimate the cause of the change in the trajectory or the shape of the cam trajectory after the change. The trajectory change detection unit 13 then functions as an adjustment value acquisition unit by acquiring an adjustment value based on the estimation result. This allows the stored trajectory data to be appropriately adjusted in accordance with the change factor. The method of acquiring the adjustment value will be described in detail later.

The zoom/focus control unit 16 applies the initial adjustment values stored in the initial adjustment data storage unit 12 and the adjustment values stored in the trajectory adjustment data storage unit 15 to the data stored in the cam trajectory/depth data storage unit 11. This sends control information based on the appropriate trajectory data to the focus drive unit 17 and the zoom drive unit 18.

Next, the flow from detecting the trajectory data to adjusting the cam trajectory in accordance with the change factor will be described with reference to FIG. 6. Unless otherwise specified, the flow shown in FIG. 6 is executed by the processor and memory included in the imaging device 100, and the processor and memory that execute these constitute the cam trajectory and depth data storage unit 11 to the zoom/focus control unit 16 in FIG. 1.

First, it is checked whether the zoom lens of the imaging device is in focus at a predetermined magnification or more (S801). The predetermined magnification can be any start position at which the difference at the intermediate position (position where the focus lens is in focus on the NEAR side) indicated by d3 in FIG. 5 can be known, and it must be a magnification on the TELE side of the intermediate position. When the zoom/focus control unit 16 determines that the focus is in focus at the timing when a focus operation occurs, it checks the magnification of the zoom lens and decides whether to proceed with control. If it determines that the focus is in focus at a predetermined zoom magnification or more, it proceeds to S802. On the other hand, if the zoom lens is less than the predetermined magnification or is out of focus, it returns to S801 and waits until the next focus operation.

Next, the trajectory change detection unit 13 acquires the focus degree and trajectory information, and stores the data in the detection data storage unit 14 (S802). The trajectory information here refers to information about the cam trajectory, such as the zoom lens position and focus lens position at the time of focusing, the position of the reference trajectory data, and the correction amount interpolated from the reference trajectory data. Next, wait until the zoom lens drives in the WIDE direction (S803). When the drive in the WIDE direction starts, the trajectory change detection unit 13 acquires the focus degree and trajectory information at each zoom position while performing zoom tracking by moving the focus lens along the cam trajectory. Then, store the acquired data as detection data in the detection data storage unit 14 (S804). Then, detect whether or not there is a change in the cam trajectory based on the accumulated detection data (called accumulated data) (S805). If the current zoom lens position and focus lens position are along the cam trajectory that corresponds to the current subject distance after being adjusted with the initial adjustment value, but the focus level is lower than a predetermined value, it is determined that a change has occurred in the cam trajectory, and the change in the cam trajectory is detected.

When the zoom lens is positioned at the WIDE end due to zoom tracking, AF operation is performed again. Then, it is determined whether the zoom lens is positioned at the WIDE end and in focus (S806). If the zoom lens is at the WIDE end and in focus, proceed to S807, otherwise return to S803. In other words, S803 to S805 are repeated until the zoom lens is driven to the WIDE end. When the zoom lens is in focus at the WIDE end, the trajectory change detection unit 13 obtains the focus degree and trajectory information and stores the data in the detection data storage unit 14 (S807). The trajectory change detection unit 13 detects whether the cam trajectory has changed from the data in the detection data storage unit 14 and estimates the cause of the change (S808). Instead of estimating the cause of the change itself, the change information of the cam trajectory may be estimated. The change information of the cam trajectory is information about the manner of change, such as the shape of the cam trajectory after the change, whether the shape of the cam trajectory (the slope at each zoom position) itself has changed, or whether the change in the shape itself is small and the value has changed overall (i.e., offset). Next, the trajectory change detection unit 13 selects an adjustment amount acquisition process from among multiple adjustment amount acquisition processes based on the change factor estimated in S808, and acquires the adjustment amount by performing the selected adjustment amount acquisition process. Furthermore, the acquired adjustment amount data is stored in the trajectory adjustment data storage unit 15 (S809).

Here, the specific flow of S808 and S809 will be described with reference to FIG. 7. The trajectory change detection unit 13 acquires detection data from the detection data storage unit 14 (S901). This detection data may be changed according to the imaging device or environment, for example, by adopting one control or multiple control data. Basically, using multiple control data can suppress erroneous correction. Next, it is determined whether the focus degree at the intermediate position (MIDDLE position) during zoom tracking is equal to or greater than a predetermined value (first value) (S902). If the focus degree at the intermediate position is equal to or greater than the predetermined value, proceed to S903, and if it is less than the predetermined value, proceed to S904.

When the process proceeds to S903, the trajectory change detection unit 13 determines whether the degree of focus (degree of focus at the WIDE position) when the zoom lens and focus lens move to the WIDE position by zoom tracking is equal to or greater than a predetermined value (second value). When the process proceeds to S904, the trajectory change detection unit 13 also determines whether the degree of focus at the WIDE position is equal to or greater than a predetermined value (third value). Note that the second value and the third value may be the same value. The cause of the change in the cam trajectory is estimated by combining the results of the determinations made in S902, S903, and S904 as to whether the degree of focus at the MIDDLE position and the WIDE position is equal to or greater than a predetermined value, and a process for acquiring an adjustment value according to the cause (how the cam trajectory changes) is selected.

In the pattern that proceeds to S905, the degree of focus at the WIDE position and the intermediate position is equal to or greater than a predetermined level, so it is determined that there is no change in the cam trajectory and no adjustment is required.

Next, in the pattern proceeding to S906, since the focus level is low only at the WIDE position, it is determined that the cause of the change is due to position fluctuation of the lenses that make up the imaging optical system, and an adjustment value acquisition process (first adjustment value acquisition process) is selected that sets different adjustment values depending on the position of the zoom lens.

As a specific example of an adjustment value acquisition process that sets different adjustment values according to the position of the zoom lens, an acquisition process method in which the degree of deterioration in focus multiplied by the lens sensitivity is used as the adjustment value is described below. First, the difference between the focus lens position (p1 in FIG. 4) when driven to the WIDE end according to the cam trajectory and the focus lens position (p2 in FIG. 4) after the lens reaches the WIDE end and is focused by AF operation is acquired. The difference amount (d2) acquired here becomes the adjustment amount for the WIDE end, and the adjustment amount for other than the WIDE end is acquired by multiplying the lens sensitivity ratio. For example, when the lens sensitivity at the WIDE end is 1, the lens sensitivity at the TELE end is 2, and the sensitivity at the intermediate position is 1/5, if the adjustment amount at the WIDE end is 10, the adjustment amount at the TELE end is 20 and the adjustment amount at the intermediate position is 2. The lens sensitivity ratio depends on the lens barrel.

Next, in the pattern proceeding to S907, since the focus level is low only at the intermediate position, it can be determined that the cam trajectory has changed due to factors other than the change in the position of the lens constituting the imaging optical system and the change in the position of the imaging element. However, since there is a possibility that there are multiple factors, in this embodiment, the adjustment value is not acquired, and the zoom/focus control unit 16 sets error information and outputs a warning log from the communication unit 10 to the surveillance monitor device 20. Note that an acquisition process may be performed in which the focus position according to the cam trajectory is acquired based on the focus information and cam trajectory information of the intermediate position acquired in S804, and the difference between the actual focused position at the same intermediate position is acquired as the adjustment value at the intermediate position. Adjustment values for other zoom lens positions are acquired so as to match the current cam trajectory curve.

Finally, in the pattern proceeding to S908, since the focus level is low at the WIDE position and the intermediate position, it is determined that the cause of the change is due to a change in the position of the image sensor, and an acquisition process (acquisition process of a second adjustment value) is selected to acquire the offset value of the cam trajectory. In this embodiment, as in S906, a process is performed to acquire the difference (d4) between the focus lens position when driven to the WIDE end according to the cam trajectory and the focus lens position after focusing by AF operation after reaching the WIDE end as an adjustment value. After that, the same adjustment value is set from the WIDE end to the TELE end without considering the lens sensitivity. For example, if the adjustment value at the WIDE end is 10, the adjustment value at the TELE end and the intermediate position is also 10. Note that the difference at the intermediate position or the TELE end may be acquired as the adjustment value instead of the difference (d4) at the WIDE end.

Return to the flow of FIG. 6. Finally, the zoom/focus control unit 16 adjusts the cam trajectory data stored in the cam trajectory and depth data storage unit 11 with the initial adjustment value stored in the initial adjustment data storage unit 12 and the adjustment value (S809) stored in the trajectory adjustment data storage unit 15 (S810). This makes it possible to maintain cam trajectory data appropriate for zoom tracking operation. This makes it possible to maintain high-precision focus accuracy even if the actual cam trajectory has changed from the cam trajectory adjusted at the time of factory adjustment due to shock, vibration, deterioration over time, temperature change, etc. The adjustment values stored in the trajectory adjustment data storage unit 15 are stored for the number of zoom lens positions obtained by dividing the range from the WIDE end to the TELE end into multiple parts, and linear interpolation can be performed between them.

As a modified example of this embodiment, the change in the cam trajectory can be detected using distance information acquired from the distance measuring device 19 instead of the focus degree. The communication unit 10 acquires the distance information from the distance measuring device 19 and transmits the distance information to the trajectory change detection unit 13 via the zoom/focus control unit 16. The trajectory change detection unit 13 can use the subject distance information acquired from the distance measuring device 19 and the difference between the subject distance calculated from the zoom lens and focus lens positions and the current cam trajectory instead of the focus degree. Since the focus lens positions based on the two types of subject distances can be known from the trajectory data, the difference can be used as the correction amount. If the difference between the intermediate position and the WIDE end is greater than a predetermined value (fourth value, fifth value), proceed to S908. If the difference at the intermediate position is smaller than the predetermined value (fourth value) and the difference at the WIDE end is equal to or greater than the predetermined value (fifth value), proceed to S906. In addition, the current cam trajectory refers to the cam trajectory after the factory adjustment when the adjustment value is not stored in the trajectory adjustment data storage unit 15, and refers to the cam trajectory after the adjustment value is stored and the initial adjustment value when the adjustment value is stored. For example, if the distance measurement device 19 detects the distance to the subject as 5 m, and the zoom lens and focus lens positions when the imaging device focuses are located on a cam trajectory of 3 m, a difference of 2 m occurs. By obtaining an adjustment value corresponding to the difference (2 m) from the cam trajectory data by linear interpolation or the like and storing the obtained adjustment value in the trajectory adjustment data storage unit 15, the trajectory data can be appropriately adjusted in the same way as when the focus degree is used. Note that the accuracy of the evaluation value may decrease depending on the subject and the shooting scene, so it is considered that if distance measurement can be performed, it is possible to detect the change in the cam trajectory more accurately by using distance information, but using the evaluation value is advantageous in that the distance measurement device 19 is not required. As long as the distance measuring device can measure distance, there is no particular restriction on the method of measuring distance. For example, an optical distance measuring sensor, an ultrasonic distance measuring sensor, or distance information calculated from phase difference information can be used.

In this embodiment, in addition to obtaining the adjustment values shown in the first embodiment, an imaging device is described that obtains adjustment values corresponding to changes in the cam trajectory caused by changes in the reference position of the zoom lens and the reference position of the focus lens. Explanations of content that overlap with the first embodiment will be omitted. Note that in this embodiment, since changes in the angle of view are detected using image information, the present invention is applied to imaging devices that are used for shooting in a fixed state, such as so-called surveillance cameras and broadcast cameras attached to a pan head. It is also applicable to cameras that are fixed to a moving object, such as an in-vehicle camera, as long as the moving object itself is within the shooting range.

Figure 8 is a configuration diagram of an imaging device according to this embodiment. The imaging device of this embodiment differs from the imaging device of embodiment 1 in that it includes a view angle deviation detection unit 21, a focus deviation detection unit 22, a reference position adjustment data storage unit 23, and a focus/view angle reference data storage unit 24. Each component can be configured by a processor and memory included in the imaging device 100, similar to the cam trajectory/depth data storage unit 11 to the zoom/focus control unit 16. Each component will be explained.

The angle of view deviation detection unit 21 compares the current angle of view with the reference angle of view indicated by the reference angle of view information stored in the focus/angle of view reference data storage unit 24, and detects the amount of deviation. This detection is performed, for example, when the zoom lens and the focus lens are driven to the initial setting position (home position) or the preset position and focused. The initial setting position and the preset position can be set by the user at any position. After the zoom lens and the focus lens are driven to the specified position, the angle of view deviation detection unit 21 compares the current angle of view with the reference angle of view and determines whether there is a difference between the two angles of view. However, the angle of view itself is not compared, but whether there is a difference between the angles of view is determined based on image information. FIG. 11 is an image diagram of the angle of view information stored as the reference angle of view information. The angle of view information stored as the reference angle of view information may be image data of the entire screen, or may be partial image data depending on memory availability. Template matching technology is a representative technology for comparing angles of view based on image information.

It is found whether the same pattern as the image stored as the reference data shown in Figure 11 exists in the currently captured image. In the case of template matching, the similarity of the images is calculated, and if the similarity is above a certain level, it can be said that the angle of view is not shifted. When using feature point information, the coordinate information of the feature point is utilized. The coordinates of the pre-stored feature point (circle in Figure 12) are compared with the coordinates of the feature point calculated from the currently captured image, and if the difference is less than a predetermined value, it can be said that the angle of view is not shifted. Note that when the angle of view changes, the coordinates of the feature point may move closer to the center of the screen or may move away from the center of the screen.

If it is determined that there is a difference in the angle of view, the system moves the zoom lens while comparing the difference between the current angle of view and the angle of view stored as reference data, searches for the position where the angles of view match, and detects the amount of deviation in the angle of view.

The focus deviation detection unit 22 compares the current focus position with the focus position information (reference focus information) stored as reference information in the focus/angle of view reference data storage unit 24, and detects the amount of deviation of the focus lens from the difference between the two.

The reference position adjustment data storage unit 23 stores the amount of deviation of the angle of view and the amount of deviation of the focus lens detected by the angle of view deviation detection unit 21 and the focus deviation detection unit 22 as adjustment values.

The focus/angle of view reference data storage unit 24 stores information on the focus position and the angle of view acquired at a specific timing. This information on the focus position and the angle of view is used to remember the state before the reference position shifted. The specific timing is when the initial setting position (home position) set at the time of installation (fixing) is registered, or when an arbitrary position (preset position) fixed in a preset mode in which the focus lens or zoom lens is fixed at an arbitrary position is registered. In addition, temperature information or time information may be used as a trigger. As the focus reference data, the evaluation value of each AF frame such as the focus in-focus frame shown in FIG. 3, the focus position/focus degree, the ratio of the evaluation values between frames, or the ratio of the focus degree between frames may be used.

Using Figures 9 and 10, the effect on the cam trajectory when the reference position of each lens is shifted will be explained. R1 in Figures 9 and 10 shows the cam trajectory immediately after adjustment. R6 in Figure 9 is the cam trajectory when the reference position of the focus lens is shifted, and similar to Figure 5, the focus position is offset overall regardless of the position of the zoom lens. R7 in Figure 10 is the cam trajectory when the reference position of the zoom lens is shifted, and the effect of the change in the focus position differs depending on the position of the zoom lens. In addition, when comparing R1 and R7 at the same zoom lens position, the difference in the angle of view is also large. Although it is omitted from the figure, when tracing the cam trajectory when focusing at the TELE end, the focus degree at the intermediate position is low in both Figures 9 and 10. In other words, the focus degree at the intermediate position is low when the position of the image sensor in Example 1 is changed or when the reference position of each lens is shifted, so there are cases where it is necessary to isolate the cause (or how it has changed). This may be necessary especially for imaging devices that are used in harsh environments, such as those subject to large temperature fluctuations and frequent shocks. After the sensor cause is determined in the first embodiment and the process proceeds to S908, this determination can be made by executing the flow of this embodiment.

The flow from when the user updates the camera settings to when the focus and angle of view reference data are stored in the focus and angle of view reference data storage unit 24 will be described with reference to FIG. 13. First, the user connects the camera to the communication unit 10 from the monitoring device 20 (S1501). Next, the user sends a zoom/focus drive instruction to the zoom/focus control unit 16 from the monitoring device 20 via the communication unit 10. The zoom/focus control unit 16 sends a control instruction to drive the lens to the focus drive unit 17 and the zoom drive unit 18. When the user confirms the angle of view and the focus in-focus position, the image information captured at the current zoom lens position and the focus lens position (in-focus position) are saved (S1502, S1503). Up to this point, the process is the same for registering the initial setting position (home position) and registering a preset that is fixed at an arbitrary position.

After the image information and the focus lens position are saved in S1503, the zoom/focus control unit 16 writes the information saved in S1503 as reference focus information and reference angle of view information in the focus/angle of view reference data storage unit 24, and ends the flow (S1504). At this time, the focus/angle of view reference data storage unit 24 stores the information in separate storage areas for when the initial setting position (home position) is registered and when a preset fixed at an arbitrary position is registered. Since the image information that serves as the reference data for the angle of view is ideally a background image that does not include a moving object, the zoom/focus control unit 16 may perform control in S1504 after confirming that no moving object is included from the camera signal. In addition, if the focus reference data includes distance information in addition to the focus information, it is easier to suppress erroneous correction. The distance measurement device 19 may send distance information to the zoom/focus control unit 16 via the communication unit 10 at regular intervals, and the distance information may be included in the distance measurement device. In the configuration diagram of FIG. 8, the distance measurement device is shown as being external, but it may be integrated with the image sensor as in the first embodiment.

Next, the flow from when the camera is driven to the initial setting position or preset position until the adjustment values for focus and angle of view are applied will be described with reference to FIG. 14. This flow starts when the user issues a command to drive to the set position from the surveillance monitor device 20 to the communication unit 10, or when the communication unit 10 is triggered by an external event or an internal event such as a timer.

First, the zoom/focus control unit 16 sends the current camera signal information and the reference data stored in the focus/angle of view reference data storage unit 24 to the angle of view deviation detection unit 21, which calculates the amount of deviation in the zoom position (S1601). Similarly, the zoom/focus control unit 16 sends the current camera signal information and the reference data information to the focus deviation detection unit 22, which calculates the amount of deviation in the focus position (S1602). The reason that the amount of deviation is detected first from the angle of view is that it has a large effect on the focusing state when the angle of view is adjusted using the zoom lens.

The amount of deviation of each lens acquired in S1601 and S1602 is written by the zoom/focus control unit 16 to the reference position adjustment data storage unit 23 (S1603). Note that the zoom/focus control unit 16 may compare the amount of deviation acquired from the focus deviation detection unit 22 with the depth data acquired from the cam trajectory and depth data storage unit 11, and write the amount of deviation only if the amount of deviation exceeds the depth of field.

After that, when driving the zoom lens or focus lens, the adjustment values stored in the reference position adjustment data storage unit 23 are applied to the data in the initial adjustment data storage unit 12 and the cam trajectory/depth data storage unit 11, and tracking control and drive control to the registered position are performed (S1604).

Next, the detailed flow of the control for calculating the amount of deviation in the zoom position (S1601) and the control for calculating the amount of deviation in the focus position (S1602) will be described with reference to Figures 15 and 16.

The angle of view deviation detection unit 21 executes the flow of FIG. 15 based on the INPUT information from the zoom/focus control unit 16. First, the zoom/focus control unit 16 checks whether the zoom lens and focus lens are driven to the registered position (S1701). If they are being driven and are not yet at the registered position, S1701 is repeated, and if they are driven to the registered position, the process proceeds to the next step and checks whether there is a moving object within the focus frame of the focus (S1702). If a moving object is detected, the process returns to S1701, and if no moving object is detected, the focus state is checked (S1703). Since there are cases where the autofocus is restarted when a moving object is no longer detected, if the focus is not focused and the focus is driven, the process returns to S1701, and if the focus is confirmed to be in focus, the current angle of view information is obtained (S1704). In this step, the angle of view deviation detection unit 21 obtains image information such as that shown in FIG. 11 and FIG. 12 from the current camera information as angle of view information.

Once the angle of view information has been acquired, the current angle of view information is compared with that of the reference data (S1705). If the difference with the reference data is greater than a threshold value, the zoom lens is moved finely to match the angle of view to the reference data, and the obtained current angle of view information is compared with that of the reference data to search for and detect a lens position where the angle of view matches. Then, information on the amount of deviation, which is the difference between the zoom position where the angle of view matches and the zoom position before the zoom lens was moved, is passed to the zoom/focus control unit 16 (S1706). On the other hand, if the difference is small, the flow ends without updating the adjustment amount.

Next, the focus shift detection unit 22 executes the flow of FIG. 16 based on the INPUT information from the zoom/focus control unit 16. This flow is performed after obtaining the amount of deviation of the zoom position, that is, after driving the zoom lens to a position where the current angle of view and the angle of view of the reference data match. Therefore, first, the angle of view information of the reference data are compared with the current angle of view information to confirm whether the current angle of view matches the angle of view of the reference data (S1801). If the angles of view do not match, the flow of S1601 by the angle of view shift detection unit 21 is determined to be incomplete or unnecessary to be adjusted, and the flow returns to the beginning and waits until S1706 by the angle of view shift detection unit 21 is completed. Only when it is determined that the current angle of view and the angle of view of the reference data match, the flow proceeds to the next flow, and it is confirmed whether there is a moving object within the focus frame as in S1702 (S1802). If a moving object is detected, the flow returns to S1801. If a moving object is not detected, the focus state is confirmed as in S1703 (S1803). If the focus is not achieved and the focus is being driven, the process returns to S1801. If the focus is confirmed to be achieved, the focus information as shown in FIG. 3 is obtained from the current camera information (S1804). Next, the current focus information is compared with the focus information of the reference data to obtain the difference in the focus lens position as the amount of deviation, and the deviation amount information is passed to the zoom/focus control unit 16 (S1805), and the flow ends.

With this embodiment, even if the reference positions of the focus lens position and zoom lens position change from the reference positions adjusted during initial adjustment due to shock, vibration, deterioration over time, temperature change, etc., and the lens control trajectory data changes, the trajectory data can be adjusted.

Figure 17 is an example of an application screen according to Example 3 of the present invention, which allows the user to switch between control on and off and to trigger execution at any timing for the controls described in Examples 1 and 2. The configuration diagram is the same as in Examples 1 and 2, and explanations of overlapping content will be omitted. Also, explanations of the flow charts that are the same as those in Examples 1 and 2 will be omitted.

The user can display and operate the tracking adjustment setting application window M1901 on the surveillance monitor device 20. In the tracking adjustment setting application window M1901, it is possible to switch the control for adjusting the zoom lens and focus lens reference positions, and the user can register the reference and perform adjustments at any trigger.

Regarding adjustment control, the menu assumes that two patterns, "Automatic Adjustment (M1902)" and "No Adjustment (M1903)," can be selected. To explain each item, "Automatic Adjustment (M1902)" performs the control explained in Examples 1 and 2, while "No Adjustment (M1903)" performs no adjustment. In addition to this, it may be possible to select, for example, only the adjustment of Example 1, only when driven to the initial setting position with the adjustment of Example 2, or only when driven to the preset position.

For manual control, this is an example in which two types of buttons are arranged: "Register Reference Data (M1904)" and "Execute Adjustment (M1905)." To explain each item, "Register Reference Data (M1904)" executes the flow in FIG. 13 explained in the second embodiment, and "Execute Adjustment (M1905)" executes the flow in FIG. 14 explained in the second embodiment.

Pressing the OK button in M1906 saves the adjustment control state and closes the application screen, and pressing the Cancel button in M1907 closes the application screen without saving the adjustment control state. Manual controls in M1904 and M1905 are reflected immediately.

This makes it possible to maintain high-precision focus accuracy even if the lens control trajectory data adjusted at the factory changes due to shock, vibration, deterioration over time, temperature changes, etc.

In the first and second embodiments, examples of adjusting the cam trajectory during shooting have been described. In this embodiment, the adjustment control of the cam trajectory shown in the first and second embodiments is executed at any timing as a maintenance mode. Furthermore, an imaging device is described that automatically determines a shooting range suitable for the adjustment control, changes the shooting direction to a shooting direction in which the determined shooting range is shot, and then acquires an adjustment value. Explanations of contents that overlap with the first and second embodiments will be omitted.

Figure 18 is a configuration diagram of the imaging device according to this embodiment. The imaging device according to this embodiment differs from the imaging device according to the second embodiment in that it includes a PAN driver 25, a TILT driver 26, and a focus evaluation value/subject distance memory 27. Each component can be configured by a processor and memory included in the imaging device 100, similar to the cam trajectory/depth data storage unit 11 to the focus/angle of view reference data memory unit 24. Each component will be explained below.

The PAN driving unit 25 drives the shooting direction of the imaging device in the horizontal direction according to instructions from the communication unit 10. The TILT driving unit 26 drives the shooting direction of the imaging device in the vertical direction according to instructions from the communication unit 10. In this embodiment, the imaging device is equipped with a PAN/TILT mechanism, but the imaging device may be mounted on a camera platform and the shooting direction may be changed from the outside. The focus evaluation value/subject distance storage unit 27 stores the focus evaluation value according to the PAN/TILT position and the subject distance information at the time of focusing in order to automatically set the shooting range suitable for adjustment control. The PAN/TILT position information is passed from the communication unit 10 to the zoom/focus control unit 16, which calculates the subject distance at the time of focusing from the cam trajectory data and stores it in the focus evaluation value/subject distance storage unit 27.

Figure 19 is an image diagram showing the concept of PAN/TILT positions in automatic shooting range setting. The entire image diagram is like a panoramic image in which images taken at each PAN/TILT position are stitched together. Driving instructions are issued from the surveillance monitor device 20 to the zoom/focus control unit 16, the PAN driving unit 25, and the TILT driving unit 26 via the communication unit 10, and the shooting range is set to P0 or P1. Figure 20 is an example of a data table of focus evaluation values corresponding to PAN/TILT positions stored in the focus evaluation value/subject distance storage unit 27 and subject distance information at the time of focusing. When focusing is achieved at the P0 shooting range in Figure 19, the focus evaluation value and subject distance information calculated from the cam trajectory data are stored in a data table with the horizontal axis being PAN 0 and the vertical axis being TILT 0. In panoramic shooting, image data is stored and stitched together, but in this embodiment, instead of images, the focus evaluation value and subject distance are stored and used for automatic setting of the shooting range.

Next, the flow from when the imaging device enters the maintenance mode, when automatic shooting range adjustment control is performed, to when correction control of the cam trajectory is performed will be described with reference to FIG. 21. First, the process waits until the user issues a maintenance mode start instruction from the monitoring device 20 to the communication unit 10 (S2101). When the maintenance mode start instruction is issued, the process proceeds to S2102, where the communication unit 10 instructs the zoom/focus control unit 16 to drive the zoom lens position to a position for the maintenance mode. The zoom lens position at this time may be determined according to the configuration of the imaging optical system, or the zoom lens position when the user operates the device may be utilized. In S2103, automatic shooting range adjustment is performed as described in FIG. 19 and FIG. 20. The communication unit 10 controls the PAN drive unit 25 and the TILT drive unit 26 to create a data table as shown in FIG. 20, and the PAN/TILT position where the subject distance is equal to or greater than a predetermined distance and where the focus evaluation value is high is determined as the shooting range during maintenance. A more detailed process of automatic shooting range adjustment will be described later.

In this flow, the automatic shooting range adjustment in S2103 is performed using the zoom lens position determined in S2102, but this may be controlled to be performed multiple times. For example, the shooting range is first determined by automatically adjusting the shooting range at the WIDE end, and then the zoom lens is moved to the TELE end, and the shooting range is automatically adjusted at the TELE end within that shooting range, so that the shooting range suitable for maintenance can be determined with higher accuracy. Based on the determined angle of view, the change in the cam trajectory is detected and the cause is estimated in S2104, and the cam trajectory is corrected in S2105, and the flow ends. Note that the processing in S2104 and S2105 is a processing for forcibly executing the flow of FIG. 6 and FIG. 7 described in the first embodiment as a maintenance mode, so the details are omitted. In addition to the contents of S2104 and S2105, the control of the second embodiment can also be incorporated.

Next, a detailed flow of the automatic shooting range adjustment control will be described with reference to FIG. 22. First, the communication unit 10 issues an instruction to the PAN driving unit 25 and the TILT driving unit 26 to drive to the initial PAN/TILT position (S2201). Here, as an example, P0 in FIG. 19 is set as the initial position. Next, the communication unit 10 sends an instruction to the zoom/focus control unit 16 to start autofocus control (S2202). Wait until the focus is in focus (S2203). When the focus is in focus, the process proceeds to S2204, where the zoom/focus control unit 16 stores the subject distance information calculated from the focus evaluation value and the cam trajectory data in the data table of the focus evaluation value/subject distance storage unit 27. Since this data table needs to store values according to the PAN/TILT position, the communication unit 10 controls the position information of the PAN driving unit 25 and the TILT driving unit 26 to be passed to the zoom/focus control unit 16. After that, the PAN/TILT position is advanced to the next position (S2205). Here, as an example, it is driven to P1 in FIG. 19. In this manner, it goes from P0 to P1 in order, and it is confirmed whether all PAN/TILT positions have been visited (S2206). If it is a position that has not yet been visited, the control returns to S2202, and the flow up to S2206 is repeated. If all PAN/TILT positions have been visited, the process proceeds to S2207, and the PAN/TILT position with the long subject distance and high focus evaluation value is determined to be the optimal position. A drive command is issued from the communication unit 10 to the PAN drive unit 25 and the TILT drive unit 26, which drive to the optimal position determined in S2207, and the flow ends (S2208).

With this embodiment, even if the actual cam trajectory changes from the cam trajectory adjusted at the factory due to shock, vibration, deterioration over time, temperature change, etc., the user can perform maintenance and maintain high-precision focus accuracy.

In this embodiment, an example will be described in which the user can execute and set the maintenance mode described in embodiment 4 from the screen. The configuration diagram is the same as in embodiment 4, and explanations of overlapping content will be omitted. Also, explanations of the flow charts that are the same as in embodiment 4 will be omitted.

Figure 23 is an example of an application screen according to the fifth embodiment of the present invention.

The user can display and operate the maintenance setting application window M2301 on the surveillance monitor device 20. The maintenance setting application window M2301 allows maintenance to be performed immediately or at a specified date and time. In addition, the user can select whether to perform a status inspection before performing maintenance and whether to automatically adjust the angle of view.

When the maintenance control is to be "immediately executed (M2302)", the menu is designed to allow two patterns to be executed, the "execute after checking the status (M2303)" button and the "execute without checking the status (M2304)" button. When the "execute after checking the status (M2303)" button is pressed, the monitoring device 20 notifies the communication unit 10 of an inspection instruction, and the communication unit 10 checks the status of the imaging device. The contents to be checked at this time include the operation time and temperature change of the imaging device, and the number of times the lens has been driven. For example, if the operation time is a predetermined period (e.g., three months or more), if the temperature inside the imaging device approaches the upper limit of the guaranteed temperature many times, or if the number of times the lens has been driven exceeds 1/10 of the product durability, if maintenance has not been performed, the maintenance control of the fourth embodiment is executed. Note that other information may be used according to the configuration of the imaging device. If it is determined that maintenance is unnecessary, the process is terminated without executing maintenance. If the "execute without checking the status (M2304)" button is pressed, the above-mentioned inspection is not performed, and the maintenance control of the fourth embodiment is executed.

When performing maintenance control "at a specified date and time (M2305)," maintenance can be performed by specifying the "execution date (M2306)" and "execution time (M2307)." When this setting is made, pressing the "OK button (M2310)" sends information from the surveillance monitor device 20 to the communication unit 10 and closes the maintenance setting application window. The imaging device performs maintenance at the specified date and time. Pressing the "Cancel button (M2311)" closes the maintenance setting application window without sending the set information to the communication unit 10.

The menu is designed to allow the user to select "Yes (M2308)" or "No (M2309)" for automatic adjustment of the shooting range. To explain each item, "Yes (M2308)" performs the automatic adjustment control of the shooting range of the fourth embodiment, while "No (M2309)" skips the automatic adjustment control of the shooting range. This setting is reflected in the control of "Execute immediately (M2302)" and "Execute at a specified date and time (M2305)."

With this embodiment, even if the actual cam trajectory changes from the cam trajectory adjusted at the factory due to shock, vibration, deterioration over time, temperature change, etc., the user can perform maintenance at any time and maintain high-precision focus accuracy.

The above describes preferred embodiments of the present invention, but it goes without saying that the present invention is not limited to these embodiments, and various modifications and variations are possible within the scope of the gist of the invention.

In addition, in Examples 1 to 3, an example was described in which the present invention was applied to a lens-integrated imaging device in which the imaging optical system (photographic lens) and the imaging device body are integrated. However, the present invention is not limited to this, and can also be applied to an imaging system (optical equipment) that is composed of an imaging device body and an interchangeable lens having an imaging optical system that is detachable from the imaging device body.

REFERENCE SIGNS LIST 1 Zoom lens 2 Focus lens 6 Image pickup element 11 Storage means 13 Adjustment value acquisition means 100 Image pickup device 110 Image pickup optical system

Claims (23)

an image sensor that photoelectrically converts an object image captured by an image capturing optical system having a zoom lens and a focus lens;
a storage means for storing trajectory data indicating a positional relationship between the zoom lens and the focus lens when the imaging optical system is focused on a predetermined subject distance;
an adjustment value acquisition means for acquiring an adjustment value for adjusting the trajectory data;
a focus control unit that controls driving of the focus lens based on the trajectory data and the adjustment value acquired by the adjustment value acquisition unit during a zoom operation,
The adjustment value acquisition means
obtaining a first focus degree when the position of the zoom lens in the trajectory data is a first position, and a second focus degree when the position of the zoom lens in the trajectory data is a second position;
the first position is an intermediate position in the trajectory data, and the second position is a position on a WIDE side of the first position,
determining an acquisition process to be executed from a plurality of acquisition processes for acquiring the adjustment value based on the first focus degree and the second focus degree;
The imaging apparatus further comprises: an image capturing apparatus that acquires the adjustment value based on the determined acquisition process. The imaging device according to claim 1, characterized in that the second position is the WIDE end in the trajectory data. The adjustment value acquisition means
3. The imaging device according to claim 1, wherein the adjustment value acquisition process is determined based on the degree of focus of the imaging optical system when the positions of the zoom lens and the focus lens indicate the focus position of the imaging optical system in the trajectory data. The adjustment value acquisition means
From a state in which the zoom lens is focused at the first position,
The zoom lens is driven in a WIDE direction to obtain the first focus degree and the second focus degree;
2. The imaging device according to claim 1, wherein the detected data is stored. an image sensor that photoelectrically converts an object image captured by an image capturing optical system having a zoom lens and a focus lens;
a storage means for storing trajectory data indicating a positional relationship between the zoom lens and the focus lens when the imaging optical system is focused on a predetermined subject distance;
an adjustment value acquisition means for acquiring an adjustment value for adjusting the trajectory data;
a focus control unit that controls driving of the focus lens based on the trajectory data and the adjustment value acquired by the adjustment value acquisition unit during a zoom operation;
distance information acquisition means for acquiring distance information;
The adjustment value acquisition means
a difference between distance information acquired based on the trajectory data and the positions of the zoom lens and the focus lens when the imaging optical system is in a focused state and distance information acquired by the distance information acquisition means is acquired when the position of the zoom lens in the trajectory data is a first position and when the position of the zoom lens in the trajectory data is a second position;
an imaging device that determines an acquisition process to be executed from a plurality of acquisition processes for acquiring the adjustment value based on a difference acquired at the first position and a difference acquired at the second position. The imaging device according to claim 5, characterized in that the second position is the WIDE end in the trajectory data. the plurality of acquisition processes include a first acquisition process and a second acquisition process,
7. The imaging apparatus according to claim 1, wherein a change in the adjustment value according to the position of the zoom lens is smaller in the second acquisition process than in the first acquisition process. the second acquisition process is a process of acquiring an offset value of the trajectory data,
The imaging apparatus according to claim 7 , wherein the offset value is obtained as the adjustment value. The imaging device according to claim 7 or 8, characterized in that the second acquisition process is a process of acquiring the adjustment value based on the focus degree of the imaging optical system when the zoom lens and the focus lens are in a third position and the trajectory data. a reference position adjusting unit for adjusting a reference position of the zoom lens and the focus lens,
The reference position adjustment means is
acquiring an adjustment value for adjusting a reference position of the zoom lens based on a difference between current angle of view information, which is an image captured after the zoom lens and the focus lens are driven to designated positions, and reference angle of view information, which is a pre-stored image;
10. The imaging device according to claim 1, further comprising: a focus lens control unit that controls a reference position of the focus lens based on a difference between a pre-stored position of the focus lens and a current position of the focus lens after being driven to the specified position. The reference position adjustment means is
11. The image pickup apparatus according to claim 10, wherein the adjustment of the reference position of the focus lens is performed after the adjustment of the reference position of the zoom lens. The timing for acquiring the pre -stored focus lens position and the reference angle of view information is
12. The imaging device according to claim 10, wherein the timing is at least one of a timing at which the predetermined position is set in a mode in which the zoom lens and the focus lens are fixed at a predetermined position, and a timing at which an instruction from a user is received. The imaging device according to any one of claims 10 to 12, characterized in that the timing for acquiring the difference between the reference angle of view and the current angle of view and the difference between a pre-stored position of the focus lens and current focus in-focus information is at least one of when a mode for fixing the zoom lens and the focus lens at a predetermined position is set and when an instruction is received from a user. The reference position adjustment means is
A difference between the reference angle of view information and the current angle of view information is
14. The imaging device according to claim 10, wherein the image capturing method is performed using at least one of feature point information of an image captured by the imaging element and a similarity of the image. The reference position adjustment means is
The difference between the pre - stored focus lens position and the current focus in-focus information is
The imaging device according to any one of claims 10 to 14, characterized in that the focus evaluation value of the image acquired by the imaging element is obtained using at least one of the ratio of the evaluation values of multiple regions of the image and the ratio of the in-focus degrees of the multiple regions. A distance information acquisition means for acquiring distance information,
The distance information acquisition means
distance information of the position of the focus lens and the timing of acquiring the reference angle of view information, which are stored in advance ;
16. The imaging apparatus according to claim 10, wherein, when the current distance information matches, a zoom deviation amount is calculated from the angle of view information, and a focus deviation amount is calculated from the focus adjustment information. the storage means stores the trajectory information before the initial adjustment and the initial adjustment value;
17. The imaging device according to claim 1, wherein the focus control means controls the focus lens based on trajectory information before the initial adjustment, the initial adjustment value, and the adjustment value acquired by the adjustment value acquisition means. a first mode for performing imaging of the imaging device;
a second mode for performing maintenance based on an instruction from a user;
The adjustment value acquisition means
When the first mode is set, the adjustment value is automatically acquired,
18. The imaging apparatus according to claim 1, wherein when the second mode is set, the acquisition of the adjustment value is performed at a timing based on an instruction from a user. A change unit changes a photographing range by controlling the imaging optical system and a drive unit that drives the imaging optical system in a panning direction or a tilting direction;
a means for storing a focus evaluation value and a subject distance when in focus according to the photographing range;
a photographing range determining unit that determines a photographing range from the stored focus evaluation value and the subject distance when the second mode is set,
20. The imaging apparatus according to claim 18, wherein the adjustment value acquisition means acquires the adjustment value in the imaging range determined by the imaging range determination means. The imaging range determining means includes:
From the photographing range in which the object distance stored is equal to or greater than a predetermined distance,
20. The imaging apparatus according to claim 19, wherein the imaging range is determined based on the stored focus evaluation value. means for determining a control method for the second mode;
a method of determining whether or not acquisition of the adjustment value is necessary and then executing acquisition of the adjustment value;
A method of acquiring the adjustment value without determining whether or not the adjustment value needs to be acquired;
21. The imaging apparatus according to claim 19, wherein the imaging apparatus is capable of determining whether or not the adjustment value is acquired at a specified date and time. The determination of whether or not the adjustment value needs to be acquired is
The image capturing apparatus performs the image capturing process by comparing at least one of the following values with a predetermined value: the operating time of the image capturing apparatus, the temperature change, and the number of times the lens is driven.
22. The imaging apparatus according to claim 21, wherein when the compared value is equal to or greater than the predetermined value, it is determined that acquisition of the adjustment value is necessary. A method for controlling an image capturing apparatus including an image capturing element that photoelectrically converts an object image captured by an image capturing optical system having a zoom lens and a focus lens, comprising the steps of:
an adjustment value acquisition step of acquiring an adjustment value for adjusting trajectory data indicating a positional relationship between the zoom lens and the focus lens when the imaging optical system is focused on a predetermined subject distance;
a focus control step of controlling the driving of the focus lens based on the trajectory data and the adjustment value acquired in the adjustment value acquisition step during a zoom operation,
In the adjustment value acquisition step,
obtaining a first focus degree when the position of the zoom lens in the trajectory data is a first position, and a second focus degree when the position of the zoom lens in the trajectory data is a second position;
the first position is an intermediate position in the trajectory data, and the second position is a position on a WIDE side of the first position,
determining an acquisition process to be executed from a plurality of acquisition processes for acquiring the adjustment value based on the first focus degree and the second focus degree;
A control method for an imaging apparatus, comprising: acquiring the adjustment value based on the determined acquisition process.

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