JP6700763B2 - Imaging device, control method thereof, and control program - Google Patents

Description

  The present invention relates to an image pickup apparatus, a control method therefor, and a control program, and more particularly to an image pickup apparatus that detects a periodic change in the amount of light from a subject.

  Generally, if there is a change (flicker) in the amount of outside light in a predetermined cycle during shooting, so-called uneven exposure may occur. For example, when a CMOS image sensor is used as an image sensor and an image is captured while shifting the storage period for each line of the image sensor, the state of the amount of external light that overlaps the storage period varies from line to line. Therefore, a line having a large integrated value of the amount of external light in the accumulation period is bright, a line having a small integrated value of the amount of external light in the accumulation period is dark, and the obtained image is an image with uneven exposure. If the length of the accumulation period (accumulation time) of each line is equal to or longer than the cycle of the light amount change, the state in which the light amount is maximum and the state in which the light amount is minimum are included in one accumulation period. The uneven exposure is not noticeable. On the other hand, if the accumulation time of each line is shorter than the cycle of light intensity change, a line that overlaps with a state where the light intensity is high and a line that overlaps with a state where the light intensity is low can be separated. The exposure unevenness in the image becomes remarkable.

  In order to solve such a problem, there is an image pickup apparatus that detects the period and phase of flicker, and performs exposure by matching the timing with the light amount peak of a flicker light source with little change in brightness to reduce the influence of flicker. ..

  For example, in order to detect the peak timing of the flicker light source, there is a method of detecting the flicker cycle and phase by performing charge accumulation at 600 Hz, which is a common multiple of 100 Hz and 120 Hz that can be the flicker cycle, that is, at an interval of 1.66 ms. It is known (see Patent Document 1).

JP, 2014-220764, A

  By the way, in an LED light source, which is one of the flicker light sources, the turn-off time (dark time) is long and the turn-on time is short. In such a flicker light source, the sampling cycle is too long in the charge accumulation at the above-mentioned 1.66 ms interval, and the flicker detection accuracy may be degraded. On the other hand, if the charge accumulation time is shortened, the sampling cycle can be shortened. However, in this case, the photometry of the subject becomes difficult due to the low luminance.

  As described above, it is difficult to shorten the sampling period at the time of photometry to accurately detect flicker and to perform photometry of a subject with low luminance.

  Therefore, an object of the present invention is to provide an imaging apparatus, a control method thereof, and a control program, which can accurately detect a periodic change in the amount of light from a subject by shortening the sampling cycle.

In order to achieve the above-mentioned object, an image pickup apparatus according to the present invention is an image pickup apparatus having an image pickup device including a plurality of pixels arranged in a two-dimensional matrix, and a plurality of predetermined lines in the image pickup device are used in a shooting environment. A line for flicker detection for detecting flicker, control means for controlling driving of the image pickup device, and calculation for obtaining a cycle and peak timing of the flicker according to outputs of the plurality of lines for flicker detection. and means, possess a plurality of lines for the flicker detection is provided with at least two or more groups, wherein, in said two or more groups of a plurality of lines for the flicker detection, charge accumulation Is controlled so as to differ by a first interval, and the first interval is a time obtained by dividing a predetermined cycle by the number of the two or more groups .

Control method according to the present invention is a control method of an image pickup apparatus which have a image sensor having a plurality of pixels arranged in a two-dimensional matrix, in the image pickup device, the flicker in shooting environment a predetermined plurality of lines a line for flicker detection for detecting, possess a control step for controlling the driving of the imaging element, and a computation step of determining the period and peak timing of the flicker in accordance with an output line for the flicker detection The plurality of lines for flicker detection includes at least two or more groups, and in the control step, the timing of starting the charge accumulation in the two or more groups of the plurality of lines for flicker detection is set to The first interval is a time period obtained by dividing a predetermined period by the number of the two or more groups .

Control program according to the present invention is a control program used in an imaging device that have the image pickup device comprising a plurality of pixels arranged in a two-dimensional matrix, in the imaging device, the imaging environment a predetermined plurality of lines As a flicker detection line for detecting flicker, a control step of controlling a drive of the image pickup device in a computer provided in the image pickup device, and a cycle and a peak of the flicker according to an output of the flicker detection line. A calculation step for obtaining timing, and a plurality of lines for flicker detection , which are executed , comprise at least two or more groups, and in the control step, in the two or more groups of the plurality of lines for flicker detection, The timing of starting the charge accumulation is controlled to be different by a first interval, and the first interval is a time obtained by dividing a predetermined period by the number of the two or more groups. To do.

  According to the present invention, it is possible to accurately detect a periodic change in the amount of light from a subject.

It is a figure showing the composition about an example of an imaging device by an embodiment of the invention. 6 is a flowchart for explaining a process at the time of live view (LV) display performed by the camera shown in FIG. 1. 2A and 2B are diagrams for explaining a pixel array in the image sensor shown in FIG. 1, in which FIG. 7A is a diagram showing an example of a pixel array, and FIG. Is. It is a figure for demonstrating the conventional flicker detection for comparison. FIG. 3 is a diagram for explaining an example of flicker detection performed by the camera shown in FIG. 1. FIG. 3 is a diagram showing a relationship between an accumulation time for flicker detection and a division number of flicker detection pixels in the camera shown in FIG. 1. FIG. 9 is a diagram for explaining another example of flicker detection performed by the camera shown in FIG. 1. FIG. 6 is a diagram for explaining calculation of a flicker phase performed by the camera shown in FIG. 1.

  Hereinafter, an example of the imaging device according to the embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing the configuration of an example of an image pickup apparatus according to an embodiment of the present invention.

  The illustrated image pickup apparatus is, for example, a digital single-lens reflex camera (hereinafter simply referred to as a camera), and includes a camera body (image pickup apparatus body) 100 and a photographing lens unit (hereinafter simply referred to as a photographing lens) 200. The camera body 100 and the taking lens 200 are mechanically and electrically connected to each other.

  The camera body 100 is provided with a microcomputer (CPU: hereinafter referred to as a camera microcomputer) 101, and the camera microcomputer 101 controls the entire camera. A memory 102 such as a RAM and a ROM is connected to the camera microcomputer 101, and the memory 102 stores a control program and is used as a work area of the camera microcomputer 101.

  An image pickup device 103 such as a CCD or a CMOS image sensor is arranged on the optical axis of the taking lens 200, and the image pickup device 103 is provided with an infrared cut filter, a low pass filter, and the like. Then, an optical image is formed on the image sensor 103 via the taking lens 200, and the image sensor 103 outputs an electric signal according to the optical image. Note that the image sensor 103 can store and read charges independently for each of a plurality of pixels (that is, a pixel group).

  A shutter 104 is arranged on the front side of the image sensor 103. The shutter 104 shields the image sensor 103 during non-shooting, and opens the shutter 104 during shooting to allow light to enter the image sensor 103. Let

  A half mirror 105 is arranged in front of the shutter 104, and the half mirror 105 reflects a part of light incident through the taking lens 200 at the time of non-shooting to focus an optical image on the focusing plate 106. Image on. The half mirror 105 is retracted from the optical axis at the time of shooting.

  A display element 107 is arranged above the focusing plate 106. The display element 107 is, for example, a PN liquid crystal device, and a user can view an optical image formed on the focusing plate 106 and various information displayed on the display element 107 through an optical finder (not shown).

  The optical image formed on the focusing plate 106 is guided to a photometric sensor (AE) 108 and an optical finder via a pentaprism 109. The photometric sensor 108 includes an image sensor such as a CCD or CMOS image sensor. An image processing CPU (hereinafter referred to as ICPU) 112 drives and controls the image sensor 103 and the photometric sensor 108 under the control of the camera microcomputer 101. Further, the ICPU 112 performs light control processing, subject detection processing, subject tracking, and detection of periodic light amount change of light from the subject (flicker detection) according to the output of the photometric sensor 108. A memory 113 including a RAM and a ROM is connected to the ICPU 112.

  The focus detection circuit (AF) 110 receives the optical image reflected by the AF mirror 111 arranged behind the half mirror 105. The focus detection circuit 110 includes an AF sensor (not shown), and performs distance measurement (that is, focus detection) according to an optical image formed on the AF sensor under the control of the camera microcomputer 101.

  A display device 114 such as an LCD is arranged on the back surface of the camera body 100, and the reproduced image is displayed on the display device when the image is reproduced. Further, at the time of shooting, a live view image and a menu are displayed on the display device 114.

  The taking lens 102 has a lens group such as a focus lens 103 and a diaphragm (not shown), and a lens microcomputer (LPU) 201 drives and controls the focus lens under the control of the camera microcomputer 101 and also controls the diaphragm. To do. The LPU 201 also sends distance information indicating the distance between the camera and the subject to the camera microcomputer 101.

  In the following description, the live view image is displayed by the output of the image sensor 103 and the flicker detection is performed. However, the photometric sensor 108 acquires the AE image and uses the AE image. Flicker detection may be performed.

  FIG. 2 is a flowchart for explaining a process at the time of live view (LV) display performed by the camera shown in FIG. Note that the processing according to the illustrated flowchart is performed under the control of the camera microcomputer 101.

  When a live view (LV) display is instructed by a user operation, the camera microcomputer 101 determines charge accumulation conditions for live view display (LV accumulation) and charge accumulation for flicker detection (flicker accumulation). To perform photometry (step S101). Here, the camera microcomputer 101 controls the photometric sensor 108 or the image sensor 103 by the ICPU 112 to perform photometry, and obtain a photometric result (for example, the brightness of the subject).

  Subsequently, the camera microcomputer 101 obtains storage conditions such as time and gain required for LV storage and flicker storage based on the photometric result (step S102). Hereinafter, the accumulation condition related to LV accumulation is referred to as an LV accumulation condition, and the accumulation condition related to flicker accumulation is referred to as a flicker accumulation condition.

  Next, the camera microcomputer 101 causes the ICPU 112 to accumulate and read charges in the image sensor 103 based on the LV accumulation condition to acquire an LV image (step S103). Here, in order to reduce the power consumption of the image sensor 103 and the time required to process the image for LV, it is desirable to thin out the pixels and perform charge accumulation and readout without using all the pixels of the image sensor 103.

  Subsequently, the camera microcomputer 101 displays the LV image on the display device 114, performs photometry of the subject based on the LV image, and further obtains the next LV accumulation condition. That is, photometry is performed (step S104). Then, the camera microcomputer 101 determines whether or not the first shutter switch SW1 is turned on by pressing the shutter button (release button) halfway (step S105).

  If the first shutter switch SW1 is off (NO in step S105), the camera microcomputer 101 determines whether there is an instruction to end the LV (step S106). For example, the camera microcomputer 101 determines that the LV end is completed if the live view display switch provided in the camera body 100 is not on (that is, is off).

  When there is an instruction to end the LV (YES in step S106), the camera microcomputer 101 ends the LV. On the other hand, if there is no LV end instruction (NO in step S106), the camera microcomputer 101 returns to the process of step S103.

  When the first shutter switch SW1 is on (YES in step S105), the camera microcomputer 101 acquires the LV image and the flicker detection image from the image sensor 103 by the ICPU 112 (step S107). Here, the camera microcomputer 101 causes the ICPU 112 to simultaneously perform LV accumulation and flicker accumulation as follows.

  FIG. 3 is a diagram for explaining a pixel array in the image sensor shown in FIG. And FIG.3(a) is a figure which shows an example of a pixel array, FIG.3(b) is a figure which expands and shows a part of pixel array shown in FIG.3(a).

  As shown in FIG. 3A, the image sensor 103 has a plurality of images arranged in a two-dimensional matrix. In the illustrated example, the first and second rows are thinned pixels, and the third and fourth rows are flicker detection pixels A. Furthermore, the 5th and 6th rows are the flicker detection pixels B. The seventh and eighth rows are the flicker detection pixels C. The ninth and tenth rows are set as LV pixels, followed by four rows of thinned pixels, and thereafter, in the same manner, flicker detection pixels A to C, LV pixels, and thinned pixels are arranged. Finally, two rows of thinned pixels are arranged.

  As described above, in the image sensor 103, at least some of the plurality of pixels are the flicker detection pixels A to C. That is, the flicker detection pixel belongs to any one of the plurality of groups. Further, the image sensor 103 includes LV (live view) pixels and thinned pixels. Further, the image sensor 103 can independently control charge accumulation and readout of a plurality of groups of flicker detection pixels and LV pixels.

  In the present embodiment, the image sensor 103 includes a plurality of groups of flicker detection pixels and LV pixels, but the photometric sensor 108 includes a plurality of groups of flicker detection pixels. A configuration for performing flicker detection by using the flicker may be used. Further, the flicker detection pixels and the LV pixels of the plurality of groups may not be provided in the order shown in FIG. 3A, or the thinned pixels may not be provided. Further, the arrangement of the flicker detection pixels and the LV pixels of a plurality of groups may not be fixed, and a configuration may be used in which each pixel is switched between the flicker detection pixel and the LV pixel depending on the situation. But it's okay.

  As shown in FIG. 3B, the pixels included in the image sensor 103 are arranged in a Bayer array, and any one of the color filters of red (R), green (Gr, Gb), and blue (B) is a pixel. Is associated with. Note that Gr represents a green filter in the row of red (R), and Gb represents a green filter in the row of blue (B).

  When acquiring an LV image from the image sensor 103, charge accumulation and readout are performed for the LV pixel. At the time of flicker detection, charge accumulation and reading are performed for the flicker detection pixel. Then, at the time of photographing (at the time of acquiring the main image), charge accumulation and reading are performed for all pixels including the thinned pixels.

  As described above, by arranging the flicker detection pixels A to C according to the predetermined rule, the flicker detection can be performed according to the change in the light amount of the subject, and the accuracy of the flicker detection can be improved. Furthermore, thinning pixels are arranged, and when acquiring LV pixels and detecting flicker, charge accumulation and reading are not performed for thinning pixels. As a result, not only power consumption can be reduced at the time of flicker detection, but also image processing time can be shortened.

  In addition, with respect to the LV pixels, charge accumulation and reading are performed under the accumulation condition that is determined so that the LV image is properly exposed. Further, as will be described later, the flicker detection pixels A to C perform charge accumulation and readout under the same accumulation condition with a sampling cycle of 600 Hz. At this time, charge accumulation is performed by shifting the phases of the flicker detection pixels A to C.

  Referring again to FIG. 2, the camera microcomputer 101 displays the LV image acquired in step S107 on the display device 114, and uses the ICPU 112 to measure the subject, store the next LV, and store for flicker detection. The storage condition of is calculated (step S108). Then, the camera microcomputer 101 obtains the flicker period and phase using the flicker detection pixels acquired in step S107, as will be described later (step S109).

  Subsequently, the camera microcomputer 101 determines whether or not the second shutter switch SW2 is turned on by fully pressing the shutter button (step S110). If the second shutter switch SW2 is off (NO in step S110), the camera microcomputer 101 returns to the process of step S105.

  On the other hand, when the second shutter switch SW2 is turned on (YES in step S110), the camera microcomputer 101 performs flicker reduction shooting that reduces the influence of flicker based on the flicker cycle and phase obtained in step S109. (Step S111). For example, in flicker reduction shooting, the camera microcomputer 101 obtains the flicker peak timing based on the flicker cycle and phase. Then, the camera microcomputer 101 drives the shutter in synchronization with the peak timing to perform shooting, and obtains a shot image (main image).

  In this way, if the photographing is performed in synchronization with the flicker peak, the exposure (photographing) can be performed at the timing when the change in the light amount of the flicker light source is the smallest. As a result, uneven brightness can be reduced. In capturing the main image, as described above, charges are accumulated in all the pixels (including the thinned pixels) of the image sensor 103.

  After that, the camera microcomputer 101 stores the main image in the memory 102 (step S112). Then, the camera microcomputer 101 displays the main image on the display device 114 as a quick review (step S113), and returns to the process of step S103.

  FIG. 4 is a diagram for explaining conventional flicker detection for comparison. FIG. 5 is a diagram for explaining an example of flicker detection performed by the camera of this embodiment.

  Referring to FIG. 4, in the conventional flicker detection, for example, accumulation and reading are repeated at intervals of 1.66 ms. In this case, a flicker light source such as an LED light source has a low flicker detection accuracy. That is, in the case of a light source such as an LED light source in which the turn-off time is longer than the turn-on time, when flicker detection is attempted, as shown in FIG. 4, there are only two photometric values in turning on the light source. . As described above, in the conventional flicker detection, the number of samplings for accurately detecting the flicker of the flicker light source such as the LED light source is small, and the flicker detection cannot be performed accurately.

  On the other hand, in the camera of this embodiment, the flicker detection pixels A to C of the third group are used to shift the accumulation timing, and increase the sampling number when the accumulation time is 1.66 ms, for example.

  Referring to FIG. 5, here, the storage timings in the flicker detection pixels A to C are shifted by a predetermined phase (shift time: for example, 0.553 ms) by the storage start signals A to C output from the ICPU 112. The storage timing shift time of 0.553 ms is the storage time of 1.66 ms divided by the number 3 of the flicker detection pixel group.

  Now, let us say that the images (that is, photometric values) obtained by the flicker detection pixels A to C are “AEa”, “AEb”, and “AEc”, respectively. Then, the n-th time (n is an integer of 2 or more) accumulation and reading are referred to as “AEa(n)”, “AEb(n)”, and “AEc(n)”, respectively.

  Each of the photometric values AEa, AEb, and AEc is a photometric value obtained at an interval of 1.66 ms, but the accumulation start timing is shifted by 0.553 ms. Therefore, when the photometric values are arranged in the order of AEa(1), AEb(1), AEc(1), AEa(2), AEb(2), AEc(2), AEa(3)... This means that photometric values were obtained at intervals of 0.553 ms.

  The number of flicker detection pixel groups (the number of divisions) can be increased within the range of the number of pixels of the image sensor 103, and the sampling number increases as the number of flicker detection pixel groups increases. The number of divisions may be determined according to the brightness of the subject. In this case, when the brightness of the subject is bright, the accumulation time of the flicker detection pixels can be shortened, so that the number of samplings can be increased even if the number of divisions is small.

  FIG. 6 is a diagram showing the relationship between the accumulation time for flicker detection and the number of divisions of flicker detection pixels in the camera shown in FIG.

  The camera microcomputer 101 obtains the accumulation time for the flicker detection accumulation based on the photometric value of the subject. In the illustrated example, the number of divisions for making the sampling number of one flicker period at least 18 points, that is, the sampling period of 0.553 ms interval is shown. Then, the camera microcomputer 101 sets the division number so that the accumulation time divided by the division number is equal to or less than the required sampling interval. This makes it possible to reduce the power consumption by reducing the number of pixels used for the flicker detection accumulation when the brightness of the subject is bright. Further, when the subject brightness is low, the number of pixels can be increased (that is, the accumulation time can be increased) to perform accurate photometry.

  Referring again to FIG. 5, here, the transition of the charge accumulation control and the photometric value when the frequency of the commercial power supply is 50 Hz is shown. When the frequency of the commercial power source is 50 Hz, the flicker cycle (light emission cycle) is about 10 ms, and when the accumulation time is 1.66 ms, 10÷1.66≈6. That is, regardless of the charge accumulation timing, the same photometric value can be obtained in 6 cycles with the accumulation time of 1.66 ms. In other words, there is a relationship of AEx(n)=AEx(n+6) (where x=a, b, or c).

  FIG. 7 is a diagram for explaining another example of flicker detection performed by the camera shown in FIG.

  FIG. 7 shows changes in the charge accumulation control and the photometric value when the frequency of the commercial power source is 60 Hz. When the frequency of the commercial power source is 60 Hz, the flicker cycle (light emission cycle) is about 8.33 ms, and when the accumulation time is 1.66 ms, it becomes 8.33÷1.66≈5. That is, regardless of the charge accumulation timing, the same photometric value can be obtained in 5 cycles with the accumulation time set to 1.66 ms. In other words, the relationship is AEx(n)=AEx(n+5).

  By the way, in a shooting environment in which no flicker exists, the photometric value AE(n) is always constant regardless of n. Now, assuming that the evaluation value at the power supply frequency of 50 Hz is F50 and the evaluation value at the power supply frequency of 60 Hz is F60, the evaluation values F50 and F60 are defined by the equations (1) and (2), respectively.

  With a predetermined threshold value as F_th, the camera microcomputer 101 determines whether or not the flicker exists in the shooting environment according to the following relationship.

  When F50<F_th and F60<F_th, the camera microcomputer 101 determines that there is no flicker. When F50<F_th and F60≧F_th, the camera microcomputer 101 determines that there is a flicker with a light emission cycle of 10 ms (that is, a commercial power supply frequency of 50 Hz). If F50≧F_th and F60<F_th, the camera microcomputer 101 determines that there is a flicker with a light emission period of 8.33 ms (that is, a commercial power frequency of 60 Hz).

  Further, when F50≧F_th and F60≧F_th, if F50≦F60, the camera microcomputer 101 determines that there is a flicker with a light emission cycle of 10 ms. If F50≧F_th and F60≧F_th, and F50>F60, the camera microcomputer 101 determines that there is a flicker with a light emission period of 8.33 ms.

  In the above example, the flicker period is detected using the flicker detection pixels A to C. However, in order to simplify the process, the flicker period is detected using only the flicker detection pixel A. You may.

  FIG. 8 is a diagram for explaining calculation of a flicker phase (peak time) performed by the camera shown in FIG.

  FIG. 8 shows an example of detection of a flicker phase for a flicker light source with a commercial power frequency of 60 Hz. The peak time t_peak is obtained by quadratic function approximation using the three photometric values of the located photometric values.

  In the illustrated example, the maximum photometric value is AEb(3), and the peak time t_peak is calculated by a quadratic function approximation using the photometric values AEa(3) and AEc(3) on both sides thereof and the photometric value AEb(3). Ask. Although the quadratic function approximation is used here when the peak time t_peak is obtained, another method may be used.

  As described above, in the embodiment of the present invention, even when the brightness of the subject is low, the sampling period is shortened to secure the flicker detection storage time. Can be detected. That is, the sampling period can be shortened and flicker detection can be performed accurately, and as a result, photometry of a subject can be performed with low brightness.

  As is clear from the above description, in the example shown in FIG. 1, the camera microcomputer 101 and the ICPU 112 function as a reading unit, a calculating unit, and a photographing control unit.

  Although the present invention has been described above based on the embodiments, the present invention is not limited to these embodiments, and various embodiments within the scope not departing from the gist of the present invention are also included in the present invention. ..

  For example, the functions of the above-described embodiments may be used as a control method, and the imaging apparatus may be caused to execute this control method. Further, a program having the functions of the above-described embodiments may be used as a control program, and the control program may be executed by a computer included in the imaging device. The control program is recorded in, for example, a computer-readable recording medium.

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

101 camera microcomputer (CPU)
103 image sensor 104 shutter 105 half mirror 107 display element 108 photometric sensor (AE)
110 Focus detection circuit (AF)
112 ICPU
114 display device 201 lens microcomputer (LCPU)

Claims (11)

An image pickup apparatus having an image pickup device having a plurality of pixels arranged in a two-dimensional matrix,
A predetermined plurality of lines in the image pickup device as flicker detection lines for detecting flicker in a shooting environment, and control means for controlling driving of the image pickup device ;
Calculating means for obtaining the period and peak timing of the flicker according to the output of the plurality of lines for flicker detection ;
Have a,
The plurality of lines for flicker detection includes at least two or more groups,
The control unit controls the two or more groups of the plurality of lines for flicker detection so that the timing of starting the charge accumulation is different by a first interval,
The imaging apparatus, wherein the first interval is a time obtained by dividing a predetermined cycle by the number of the two or more groups . The image sensor is used when photographing an object, and other pixels of the plurality of pixels except for the plurality of lines for flicker detection are used as live view pixels or pixels for thinning out. The image pickup apparatus according to claim 1 , wherein the image pickup apparatus is provided. Wherein, when obtaining the captured image by imaging the object, wherein the plurality of lines for the flicker detection, the line for live view live view formed by pixels for, and for the thinning-out the imaging apparatus according to claim 2, characterized in that for controlling the drive of the imaging device to obtain the captured image using all of the output of the decimation lines formed by pixels. The image pickup apparatus according to claim 1, wherein the image pickup element is provided in a photometric sensor for measuring the brightness of a subject. Setting a value obtained by dividing the number of the two or more groups from the storage time between charges upon detection of the flicker, to be equal to or less than the first interval, for setting the number of the two or more groups of the imaging apparatus according to any one of claims 1 to 4, characterized in that it has means. Wherein, for each of the two or more groups of the imaging device, any one of claims 1 to 5, wherein the controller controls so as to accumulate and read the charge in the same storage conditions The imaging device according to.   7. The predetermined period is an interval at which charge accumulation in each line for flicker detection is started, and is a common multiple of different flicker periods. Imaging device.   The image pickup apparatus according to claim 7, wherein the predetermined cycle is approximately 1.66 ms.   9. The calculation unit obtains the flicker cycle and peak timing based on temporally continuous outputs output from the plurality of lines for detecting the flicker, according to any one of claims 1 to 8. The image pickup device according to item 1. A method for controlling an imaging device that have the image pickup device comprising a plurality of pixels arranged in a two-dimensional matrix,
In the image sensor, a predetermined plurality of lines are flicker detection lines for detecting flicker in a shooting environment, and a control step of controlling driving of the image sensor ,
A calculation step of obtaining a cycle and a peak timing of the flicker according to the output of the line for detecting the flicker ,
Have a,
The plurality of lines for flicker detection includes at least two or more groups,
In the control step, in the two or more groups of the plurality of lines for flicker detection, control is performed such that the timing of starting charge accumulation is different by a first interval,
The said 1st space|interval is the time which divided a predetermined period by the number of the said 2 or more groups, The control method of the imaging device characterized by the above-mentioned . A control program used in an imaging device that have the image pickup device comprising a plurality of pixels arranged in a two-dimensional matrix,
In the image sensor, a predetermined plurality of lines are used as flicker detection lines for detecting flicker in a shooting environment,
In the computer included in the imaging device,
A control step of controlling the driving of the image sensor ,
A calculation step of obtaining the period and peak timing of the flicker according to the output of the line for flicker detection ,
Was executed,
The plurality of lines for flicker detection includes at least two or more groups,
In the control step, in the two or more groups of the plurality of lines for flicker detection, control is performed such that the timing of starting charge accumulation is different by a first interval,
The control program, wherein the first interval is a time obtained by dividing a predetermined cycle by the number of the two or more groups .