JP2011059346A - Imaging apparatus and method of controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To performs stable focus detection even when posture of the imaging apparatus is changed, in an imaging apparatus including a cross sensor. <P>SOLUTION: Based on at least part of signals respectively output from first and second line sensor pairs (401 and 402) constituting the cross sensor, the imaging apparatus detects a shift amount of the phase of the signal for every line sensor pair, and obtains a focus state by a phase difference method. The posture of the imaging apparatus is detected (S21), and in a plurality of photoelectric conversion elements respectively constituting the first and second line sensor pairs based on a detected posture, a detection range to output the signal used for detecting the shift amount is changed (S24). In such a case, when the posture of the imaging apparatus changes, the detection range of the first line sensor pair before the change is changed as the detection range of the second line sensor pair after the change, and also the detection range of the second line sensor pair before the change is changed as the detection range of the first line sensor pair after the change. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an imaging apparatus and a control method thereof, and more particularly to a technique for detecting a focus state in an imaging apparatus.

  2. Description of the Related Art Conventionally, a camera that switches focus detection control between a horizontal position and a vertical position based on the camera position is known.

  In this type of camera, since the shooting screen is generally horizontally long, a plurality of distance measuring points for focus detection are arranged longer in the horizontal direction than in the vertical direction. Therefore, comparing the difference in defocus amount between the distance measurement point located at the top and the distance measurement point located at the bottom when the camera posture is in the horizontal position and the vertical position, the camera posture is The difference in the amount of defocusing tends to be larger at the position. For this reason, in near-point priority focus control that selects the distance measurement point that is closest to the subject among the multiple distance measurement points, the defocus amount varies greatly depending on the distance measurement point. In some cases, a subject closer than the main subject is selected.

  Therefore, Reference 1 proposes a method in which a plurality of distance measuring points are divided into a plurality of groups in advance, and the closest point within the predetermined value of the difference in the defocus amount of the closest point in each group is proposed. Accordingly, even if there is a subject that can be measured in the other direction and in front of the main subject when viewed from the photographer, the main subject can be selected.

  Further, in this type of camera, when the camera is changed between the horizontal position and the vertical position, the distance measuring point selected in advance is not changed. Therefore, to shoot with the same composition as before changing the camera, the focus detection point must be selected again.

  Therefore, in Reference Document 2, for example, when the highest distance measuring point is selected in advance, after the camera is moved from the horizontal position to the vertical position, the highest distance measuring point is selected. A method of changing to is proposed.

JP-A-6-82678 JP-A-9-90202

  By the way, a camera is known in which the capturing power of a subject is improved by a cross sensor arranged on a sensor surface so that a plurality of photoelectric conversion elements intersect each other on a primary imaging plane. In this type of camera, the edge of the subject in a plurality of directions can be detected by using a cross sensor. Thereby, the direction of any one of the plurality of photoelectric conversion elements and the direction of the edge of the subject can be orthogonalized, and the capturing power of the subject is improved.

  On the other hand, in such a cross sensor, for example, as shown in FIG. 9, the number of photoelectric conversion elements arranged in a certain direction may be different from the number of photoelectric conversion elements arranged in a direction in another direction. If the number of photoelectric conversion elements is small, it is difficult to be influenced by the background, but the maximum defocus amount that can be detected is small. On the other hand, if the number of photoelectric conversion elements is large, the maximum defocus amount that can be detected increases, but it is easily affected by the background. Thus, if the number of photoelectric conversion elements arranged in each direction is different, the cross sensor has different ranging characteristics.

  For this reason, these ranging characteristics depend on the arrangement direction of the arranged photoelectric conversion elements. That is, the focus detection capability differs between the distance of the same subject when the camera is in the horizontal position and the vertical position. Therefore, as soon as the camera is changed between the horizontal position and the vertical position, the focus detection, which has been stable until now, may become unstable or easily pulled to the background. A sense of stability cannot be obtained.

  Here, as shown in FIG. 9A, a cross sensor with a larger number of pixels of the photoelectric conversion element h in the horizontal direction than the number of pixels of the photoelectric conversion element v in the vertical direction, and a background filled with diagonal lines and an unpainted subject. A case where the distance is measured will be described as an example. In FIG. 9A, as shown in FIG. 9C, focus detection is performed using an object image signal output from the photoelectric conversion element h in the horizontal direction. On the other hand, in the state shown in FIG. 9B in which the posture of the camera is rotated by 90 degrees, when measuring the same subject, the subject output from the photoelectric conversion element v as shown in FIG. Focus detection is performed using the image signal. At this time, the image signal shown in FIG. 9D is applied to the edge of the image signal because the number of pixels of the photoelectric conversion element v is smaller than that of the photoelectric conversion element h compared to the image signal shown in FIG. 9B. And focus detection becomes unstable.

  Conversely, when focus detection is stable with the cross sensor in the state shown in FIG. 9B, the camera is rotated 90 degrees and the cross sensor is in the state shown in FIG. Since the distance measurement range is expanded, it becomes easy to be pulled by the background.

  The present invention has been made in view of the above problems, and an object of the present invention is to enable stable focus detection even in a case where the orientation of the imaging device is changed in an imaging device including a cross sensor.

  In order to achieve the above object, an imaging apparatus according to the present invention includes a first line sensor pair composed of two line sensors arranged in a row for detecting a focus state by a phase difference method, and the first A second line sensor pair composed of two line sensors arranged in a line so as to be perpendicular to the pair of line sensors, and a signal output from the first and second line sensor pairs. Focus detection means for detecting the phase shift amount of the signal for each of the first and second line sensor pairs and determining the focus state based on at least a part, and attitude detection means for detecting the attitude of the imaging device And, based on the posture detected by the posture detection means, a photoelectric device that outputs a signal used for detecting the shift amount among the plurality of photoelectric conversion elements constituting each of the first and second line sensor pairs. conversion A change unit that changes a detection range that is a child range, and the change unit changes the detection range of the first line sensor pair before the change when the posture of the imaging device is changed. The detection range of the second line sensor pair after the change is changed, and the detection range of the second line sensor pair before the change is changed as the detection range of the first line sensor pair after the change.

  According to the present invention, in an imaging apparatus provided with a cross sensor, stable focus detection can be performed even when the attitude of the imaging apparatus is changed.

1 is a block diagram illustrating a configuration of an imaging apparatus according to an embodiment of the present invention. The figure explaining arrangement | positioning of two sets of line sensor pairs in embodiment of this invention. The optical path diagram for demonstrating the principle which detects a focus state. 5 is a flowchart illustrating a photographing process according to the first embodiment of the present invention. 5 is a flowchart for explaining focus detection range change processing according to the first embodiment of the present invention. The figure explaining the positional relationship of the detection range of a photoelectric conversion element and the ranging point in the 1st Embodiment of this invention. The figure for demonstrating the change of the detection range in the 1st Embodiment of this invention. The flowchart explaining the focus detection range change process in the 2nd Embodiment of this invention. The figure explaining the positional relationship of a conventional pair of photoelectric conversion element and a ranging point, and an image signal.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

Device Configuration FIG. 1 is a block diagram showing a configuration of a digital camera as an example of an imaging device according to an embodiment of the present invention. In FIG. 1, reference numeral 101 denotes a photographing lens. In the figure, it is expressed by a single lens, but it is actually constituted by a combination of a plurality of lenses. Reference numeral 107 denotes an image sensor such as a CCD or CMOS sensor that forms a subject optical image that has passed through the photographic lens 101. An image signal obtained by converting the image signal obtained by converting into an electric charge according to the amount of light of the formed subject optical image. Output. The image signal output from the image sensor 107 is converted into a digital image signal by the A / D converter 110 via the analog signal processing circuit 109.

  Reference numeral 102 denotes a main mirror having a semi-transmissive portion, which is retracted out of the photographing optical path at the time of photographing, and is obliquely provided on the photographing optical path at the time of detecting the focus. FIG. 1 shows a state (mirror down) inserted in the photographing optical path. The main mirror 102 guides a part of the light beam that has passed through the photographing lens 101 to a finder optical system including the focusing plate 103, the pentaprism 104, and the eyepiece lens 105 while being obliquely provided in the photographing optical path.

  Reference numeral 106 denotes a submirror that can be folded and unfolded with respect to the main mirror 102 in synchronization with the operation of the main mirror 102. A part of the light beam that has passed through the semi-transmissive portion of the main mirror 102 is reflected downward by the sub-mirror 106 and enters the phase difference type focus detection unit 108, and the focus detection unit 108 detects the in-focus state of the photographing lens 101. Is done.

  In addition, a system controller 112 including a CPU that controls the entire camera, a RAM that is a storage device, and the like is provided, and operations of each unit described below are appropriately controlled.

  Reference numeral 113 denotes a communication circuit that is connected to the system controller 112 and communicates with the photographing lens 101, a lens driving mechanism that drives the lens to perform focus adjustment, and a lens driving unit that includes the driving circuit. Reference numeral 114 denotes a mirror driving unit that is connected to the system controller 112 and drives the main mirror 102 to the outside of the photographing light beam. A sensor control circuit 115 is connected to the system controller 112 and controls the focus detection unit 108. Reference numeral 116 denotes an image sensor driving unit that is connected to the system controller 112 and drives the image sensor 107.

  A digital signal processing circuit 111 is connected to the system controller 112 and performs image processing such as shading correction and gamma correction on the digital image signal output from the A / D converter 110.

  Reference numeral 117 denotes a buffer memory that is connected to the digital signal processing circuit 111 and can store data for a plurality of frames captured by the image sensor 107. The A / D converted signal is temporarily stored in the buffer memory 117. Remembered. The digital signal processing circuit 111 reads the data stored in the buffer memory 117 and performs the above-described processes, and the processed data is stored in the buffer memory 117 again.

  Reference numeral 118 denotes a recording / recording unit that is connected to the digital signal processing circuit 111 and records the image data, which has been temporarily stored in the buffer memory 117 and subjected to various processes by the digital signal processing circuit 111, in an external storage medium 119 such as a memory card. It is a reproduction signal processing circuit. In addition, when reading image data from the external storage medium 119, the recording / playback signal processing circuit 118 performs image data expansion processing.

  Reference numeral 121 denotes a display unit for displaying a captured image. The display unit 121 displays an image signal obtained from the image sensor 107 and is used when reproducing image data recorded in the storage medium 119. It is done. When displaying an image on the display unit 121, the image data stored in the buffer memory 117 is read, the digital image data is converted into an analog video signal by the D / A converter 120, and the image is displayed on the display unit 121. To do.

  Reference numeral 122 denotes an attitude detection circuit that is connected to the system controller 112 and detects the attitude of the camera. A gyroscope that measures the angle and angular velocity of an object may be used for camera posture detection.

  Reference numeral 123 denotes an operation member for operating the camera, such as a power switch for turning on / off the camera, a release button, and a setting button for selecting a shooting mode such as a person shooting mode. Is an operation unit provided. When these switches and buttons are operated, a signal corresponding to the operation is input to the system controller 112. The release button is connected to SW1 that is turned on by the first stroke operation (half press operation) of the release button operated by the photographer and SW2 that is turned on by the second stroke operation (full press operation) of the release button. Has been.

  FIG. 2 is a diagram illustrating a line sensor pair 401 (first line sensor pair) and a line sensor pair 402 (second line sensor pair) included in the phase difference type focus detection unit 108. The line sensor pair 401 includes a pair of vertical line sensors 401a and 401b arranged in a line, and the line sensor pair 402 includes a pair of horizontal line sensors 402a and 402b arranged in a line. Each line sensor is composed of a plurality of photoelectric conversion elements, and here, the case where the camera is in the horizontal position is shown. Here, the line sensors 401a and 401b are configured by photoelectric conversion elements V1 to V40, respectively, and the line sensors 402a and 402b are configured by photoelectric conversion elements H1 to H50, respectively. However, the configuration of the line sensors 401a and 401b, 402a and 402b shown here is an example for explaining the first embodiment, and it goes without saying that the number of photoelectric conversion elements is not limited to this.

  FIG. 3 is an optical path diagram for explaining the principle of detecting the focus state by the focus detection unit 108, and shows the components developed on the optical axis of the photographing lens 101. However, the main mirror 102 and the sub mirror 106 are omitted. 3 shows the line sensor pair 401 shown in FIG. 2, the line sensor pair 402 has the same configuration. In FIG. 3, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals.

  In FIG. 3, reference numeral 109 denotes a field mask arranged near the planned focal plane of the photographing lens 101, that is, a plane conjugate with the film plane, and 201 denotes a field lens arranged similarly near the planned focal plane. Reference numeral 202 denotes a secondary imaging system composed of two lenses 202a and 202b, and 203 includes a pair of longitudinal line sensors 401a and 401b disposed behind the corresponding lenses 202a and 202b. This is a line sensor pair 401. Reference numeral 204 denotes a stop having two openings 204a and 204b arranged corresponding to the two lenses 202a and 202b of the secondary imaging system 202, and 205 denotes the photographing lens 101 including two divided areas 205a and 205b. The exit pupil is shown.

  In such a configuration, for example, when the photographic lens 101 is extended to the left in the drawing and a light beam is imaged to the left of the image sensor 107, the pair of images formed on the line sensor pair 401 is in the direction of the arrow A. Displace. By detecting the relative shift amount of the pair of images by the photoelectric conversion element 203, it is possible to detect the in-focus state of the photographing lens 101 and further to perform focus adjustment driving of the photographing lens 101. When the photographing lens 101 is retracted to the right in the figure, the pair of images on the line sensor pair 401 is displaced in the direction opposite to the direction of the arrow A in the figure.

<First Embodiment>
With reference to FIG. 4, the overall flow of the imaging process in the first embodiment of the present invention by the camera having the above-described configuration will be described.

  In S <b> 11, the system controller 112 determines whether the SW <b> 1 is turned on by pressing the release switch in the operation unit 123. If SW1 is not turned on, the process is repeated until SW1 is turned on. When SW1 is turned on, the process proceeds to S12. In S12, the focus detection range is changed based on the camera posture detected by the posture detection circuit 122. Details of the focus detection range changing process will be described later.

  Next, in S13, the system controller 112 uses the focus detection unit 108 to detect the focus state (defocus amount).

  Here, the region for detecting the focus state will be described. 6A shows a plurality of ranging points 501 to 505 in the effective pixel region of the image sensor 107, and FIG. 6B shows the ranging points shown in FIG. 6A and the vertical direction shown in FIG. It is a figure which shows the positional relationship with the line sensor pair 401 of this and the line sensor pair 402 of a horizontal direction. Of the plurality of distance measuring points 501 to 505, the distance measuring point used for focus adjustment is selected by a known method such as an instruction from the photographer or near-point priority AF processing. When the distance measuring point 501 is selected, signals output from the photoelectric conversion elements V27 to V40 are used when the photoelectric conversion elements V1 to V13 are selected, and when the distance measuring point 505 is selected. Similarly, when the ranging point 502 is selected, signals output from the photoelectric conversion elements H35 to H50 are used when the photoelectric conversion elements H1 to H15 and the ranging point 504 are selected. When the distance measuring point 503 is selected, signals output from the photoelectric conversion elements V13 to V27 and the photoelectric conversion elements H16 to H35 are used.

  In S14, it is determined whether or not the focus state detected based on the signal obtained from the distance measuring point described above represents in-focus. If it is not in focus, the process proceeds to S15, and the system controller 112 converts the defocus amount detected in S13 into the number of pulses that is the driving amount of the photographing lens 101, and drives the photographing lens 101 via the lens driving unit 113. On the other hand, if it is in focus, the process proceeds to S16.

  In S <b> 16, the system controller 112 determines again whether or not SW <b> 1 is turned on in the operation unit 123. If SW1 is OFF, the process returns to S11. If SW1 is ON, the process proceeds to S17. In S17, the system controller 112 determines whether or not SW2 is turned on by operating the release switch. If it is not turned on, the system controller 112 returns to S16, and if it is turned on, the process proceeds to S18.

  In S <b> 18, the system controller 112 retracts the main mirror 102 and the sub mirror 106 to the outside of the imaging optical path via the mirror driving unit 114 and drives the imaging element 107 via the imaging element driving unit 116 to perform imaging.

  Next, the focus detection range changing process performed in S12 of FIG. 4 will be described with reference to FIG.

  In S21, the system controller 112 drives the attitude detection circuit 122 to detect the camera attitude (vertical position, horizontal position), and determines whether the camera attitude detected in S22 is the same as the previously detected attitude. . If they are the same (NO in S22), there is no need to change the focus detection range, so the process returns to the process of FIG. 4, and if the attitude has changed (YES in S22), the process proceeds to S23.

  When the posture is changed from the vertical position to the horizontal position, before the change, the line sensor pair 401 in FIG. 2 is horizontal with respect to the ground and the line sensor pair 402 is vertical. 402 is horizontal and the line sensor pair 401 is vertical. Similarly, when the posture is changed from the horizontal position to the vertical position, the line sensor pair 402 in FIG. 2 is horizontal with respect to the ground and the line sensor pair 401 is vertical with respect to the ground before the change. The line sensor pair 401 is horizontal and the line sensor pair 402 is vertical.

  Therefore, in S23, when the distance measuring point corresponding to the line sensor pair 401 is selected, the line sensor pair 402 is changed, and when the distance measuring point corresponding to the line sensor pair 402 is selected. The line sensor pair 401 is changed. When the distance measuring point 503 is selected, the horizontal / vertical directions of the line sensor pairs 401 and 402 are exchanged.

  Subsequently, in S24, the range (detection range) of the photoelectric conversion element that outputs a signal used for focus detection among the photoelectric conversion elements constituting the changed line sensor pair 401 and / or 402 is changed. Here, the process performed in S24 will be described in detail with reference to FIGS. FIG. 7 is a diagram for explaining the change of the detection range. Here, it is assumed that a distance measuring point 503 shown in FIG. 6 is selected as the distance measuring point.

  When the posture is changed from the horizontal position as shown in FIG. 6B to the vertical position as shown in FIG. 6C, first, in the horizontal position, the photoelectric conversion elements H16˜ H35 (20 elements) is the detection range. When this is changed to the vertical position, the line sensor pair 401 becomes horizontal. Since the detection range corresponding to the distance measuring point 503 of the line sensor pair 401 is the photoelectric conversion elements V14 to V27 (14 elements), as can be seen from FIG. 7, it is compared with the detection range of the line sensor pair 402 before the change. It becomes narrow. On the other hand, in the horizontal position before the change, the photoelectric conversion elements V14 to V27 in the vertical line sensor pair 401 are in the detection range. When this is changed to the vertical position, the line sensor pair 402 is in the vertical direction. Since the detection range corresponding to the distance measuring point 503 of the line sensor pair 402 is the photoelectric conversion elements H16 to H35, as can be seen from FIG. 7, the detection range becomes wider than before the change. Therefore, in the first embodiment, after the change from the horizontal position to the vertical position, the detection range of the line sensor pair 401 is expanded to V11 to V27, and the detection range of the line sensor pair 402 is reduced to H19 to H32. To do. FIG. 6C is a diagram showing a state after the detection range is changed in this way.

  Further, when the vertical position is within the detection range as shown in FIG. 6C, when the camera posture is returned to the horizontal position again, the detection range is changed as follows. That is, the detection range of the line sensor pair 402 in the horizontal direction after the change is expanded from the photoelectric conversion elements H19 to H32 to H16 to H32, and the detection range of the line sensor pair 401 in the vertical direction is expanded from the photoelectric conversion elements V11 to V27. Reduce to V14 to V27. That is, it returns to the detection range as shown in FIG.

  By changing the detection range in this way, signals in the same region of the subject image can be used for focus detection even when the posture of the camera changes from the horizontal position to the vertical position and from the vertical position to the horizontal position. Therefore, stable focus adjustment can be performed.

  On the other hand, the distance measurement points 501, 502, 504, and 505 of only one of the line sensor pair 401 or the line sensor pair 402 have a fixed photoelectric conversion element range regardless of the posture.

  The detection range is changed by the system controller 112. At this time, the system controller 112 may change the detection range by changing and extracting the range used for the calculation from the signal obtained from the focus detection unit 108 via the sensor control circuit 115. Further, the detection range may be changed by changing the range in which signals are read from the photoelectric conversion elements. Furthermore, the detection range may be changed by changing the range in which the photoelectric conversion element performs charge accumulation.

  When the detection range is changed in S24 as described above, the process returns to the process of FIG.

  As described above, according to the first embodiment, stable focus adjustment can be performed even when the posture of the camera is changed from the horizontal position to the vertical position and from the vertical position to the horizontal position.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. Note that the overall flow of the imaging process in the second embodiment is the same as that shown in FIG. However, since the detection range changing process performed in S12 is different from that in FIG. 5 described in the first embodiment, the detection range changing process will be described below with reference to FIG. Step numbers will be assigned and description will be omitted as appropriate.

  In S21, the system controller 112 drives the attitude detection circuit 122 to detect the camera attitude (vertical position, horizontal position), and determines whether the camera attitude detected in S22 is the same as the previously detected attitude. . If they are the same (NO in S22), there is no need to change the focus adjustment range, so the process returns to the process of FIG. 4, and if the posture has changed (YES in S22), the process proceeds to S31.

  In S31, it is determined whether or not the focus state detected in S13 of FIG. If the focus state becomes unstable, the process proceeds to S23, and if the focus state does not become unstable, the process returns to the process of FIG. Note that whether or not the focus state has become unstable may be determined because the correlation amount of the signal obtained from the detection range is significantly lower than the previous correlation amount. It may be judged from the fact that the accumulation time of Alternatively, the determination may be made based on the fact that the defocus amount is large and the front pin or the rear pin is used. In any case, it is only necessary to determine whether or not the index indicating the stability of the focus state is within a preset range.

  Since the processing of S23 and S24 is the same as the processing described with reference to FIGS. 5 to 7 in the first embodiment, description thereof is omitted here.

  As described above, according to the second embodiment, only when the focus state becomes unstable, the horizontal and vertical directions of the line sensor pair are changed and the detection range is changed. In addition to the same effect, it is possible to simplify complicated control accompanying the change of the detection range.

Claims (6)

A first line sensor pair composed of two line sensors arranged in a row for detecting a focus state by a phase difference method, and arranged in a row so as to be perpendicular to the first line sensor pair A second line sensor pair composed of two line sensors, and the first and second lines based on at least part of signals output from the first and second line sensor pairs. A focus detection means for detecting a phase shift amount of the signal for each sensor pair and obtaining a focus state;
Attitude detection means for detecting the attitude of the imaging device;
A photoelectric conversion element that outputs a signal used to detect the shift amount among a plurality of photoelectric conversion elements constituting each of the first and second line sensor pairs based on the attitude detected by the attitude detection means. Change means for changing the detection range that is the range of
The changing means changes the detection range of the first line sensor pair before the change as the detection range of the second line sensor pair after the change when the posture of the imaging apparatus is changed, An imaging apparatus, wherein a detection range of the second line sensor pair before change is changed as a detection range of the first line sensor pair after change. A determination means for determining whether or not an index representing the stability of the focus state obtained from the focus detection means is within a preset range when the posture of the imaging apparatus is changed;
When the determination unit determines that the index indicating the stability is not within a preset range, the change unit changes the detection range of the first and second line sensor pairs. The imaging apparatus according to claim 1.   2. The focus detection unit detects a deviation amount by extracting a signal corresponding to the detection range from signals output from the first and second line sensor pairs. 2. The imaging device according to 2.   The imaging according to claim 1, wherein the focus detection unit reads a signal from a photoelectric conversion element corresponding to the detection range among the photoelectric conversion elements of the first and second line sensor pairs. apparatus.   3. The charge detection unit according to claim 1, wherein the focus detection unit causes charge to be accumulated in a photoelectric conversion element corresponding to the detection range among the photoelectric conversion elements of the first and second line sensor pairs. The imaging device described. A first line sensor pair composed of two line sensors arranged in a row for detecting a focus state by a phase difference method, and arranged in a row so as to be perpendicular to the first line sensor pair A second line sensor pair composed of two line sensors, and the first and second lines based on at least part of signals output from the first and second line sensor pairs. A method of controlling an imaging apparatus having a focus detection unit that detects a phase shift amount of the signal for each sensor pair and obtains a focus state,
A posture detection step in which the posture detection means detects the posture of the imaging device;
Based on the posture detected in the posture detection step, the changing unit outputs a signal used for detecting a deviation amount among the plurality of photoelectric conversion elements constituting each of the first and second line sensor pairs. A change step for changing the detection range that is the range of the photoelectric conversion element,
In the changing step, when the posture of the imaging device is changed, the detection range of the first line sensor pair before the change is changed as the detection range of the second line sensor pair after the change, and the change is made. A method for controlling an imaging apparatus, wherein the detection range of the second pair of line sensors before is changed as the detection range of the first pair of line sensors after change.

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