JP2016208234A - Imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device capable of effectively suppressing flicker by simple shutter control.SOLUTION: An imaging device 1 includes an imaging element 40, a lens 10 for forming light from the target area on the imaging element 40, a shutter 30 disposed on the target area side with respect to the imaging element 40, and a control unit 50. The control unit 50 opens the shutter 30 a plurality of times within the imaging cycle of one frame and guides the light taken by the lens 10 to the imaging element 40. This makes it possible to effectively suppress flicker by simple shutter control.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an imaging apparatus that images a target area, and is particularly suitable for imaging a landscape including a traffic light.

  2. Description of the Related Art An imaging device that captures images of streets and intersections with a monitoring camera is known. In this type of imaging apparatus, the captured image is used, for example, for verification of a traffic accident. In the verification, in addition to the situation of the vehicle and the pedestrian, the lighting condition of the traffic light is confirmed. That is, it is confirmed whether the traffic light was lit in red, blue, or yellow at the time of the accident.

  In recent years, light emitting diodes have been used as light sources for traffic lights. When a light emitting diode is driven by a commercial AC power source, the light emitting diode repeatedly turns on and off in a short cycle. Therefore, a traffic light using a light emitting diode as a light source repeats blinking in a short cycle when each color is turned on. When the traffic light blinks in a short cycle in this way, the luminance of the captured image of the traffic light changes between frames, and flicker (flicker) occurs in the captured image of the traffic light. If flicker occurs in the captured image of the traffic light, it may happen that the lighting color of the traffic light cannot be properly confirmed in the verification.

  The following Patent Document 1 describes an imaging device capable of suppressing flicker caused by LED illumination or the like. In this imaging device, when it is determined that there is flicker, the timing of the charge sweep-out pulse and the charge readout pulse for which the shutter control of the CCD sensor is controlled is changed in each field, and the same phase portion of the illumination light emission period in each field Is controlled so that the camera can be exposed.

JP 2011-193065 A

  In the method of Patent Document 1, complicated shutter control is required in which the timing of the charge sweep-out pulse and the charge readout pulse is changed in each field, and the camera exposes the same phase portion of the illumination light emission period in each field. there were.

  In view of such a problem, an object of the present invention is to provide an imaging apparatus capable of effectively suppressing flicker by simple shutter control.

  A main aspect of the present invention relates to an imaging apparatus. An imaging apparatus according to this aspect includes: an imaging element; a lens that images light from a target area on the imaging element; a shutter disposed on the target area side with respect to the imaging element; and a control unit. Prepare. The control unit opens the shutter a plurality of times within an imaging period of one frame and guides light captured by the lens to the imaging element.

  According to the imaging apparatus according to this aspect, since the imaging element is exposed a plurality of times within an imaging cycle of one frame, even when imaging a light emitting source that blinks in a short cycle such as a traffic light, the light emitting source in each imaging cycle Can be easily received by the imaging device, and the total amount of light received from the light source can be suppressed from greatly differing between frames. Therefore, it is possible to effectively suppress flicker occurring in the captured image of the light source. Further, this effect can be realized by simple control such as opening and closing the shutter a plurality of times within the imaging cycle. Therefore, according to the imaging apparatus according to this aspect, it is possible to provide an imaging apparatus that can effectively suppress flicker by simple shutter control.

  In the imaging apparatus according to this aspect, the imaging element accumulates and outputs charges corresponding to the amount of received light for each line, and the control unit overlaps a part of the charge accumulation period in each line on the imaging element. In this way, the image pickup device is controlled in such a manner that the shutter is opened a plurality of times within the overlapping accumulation period in which the charge accumulation periods of all the lines overlap each other. In this case, since the image sensor is exposed during the overlapping accumulation period, the light of the target area is irradiated to all lines at the same timing and exposure period. For this reason, even when a subject moving at high speed is included in the target area, the captured image of the subject is not distorted.

  In the imaging apparatus according to this aspect, the control unit may be configured to repeatedly open and close the shutter over the entire overlap accumulation period. In this way, the shutter opening period is likely to be included in the lighting period of the light emitting source that blinks in a short cycle, and the light from the light emitting source is more easily received by the image sensor. Therefore, the generation of a frame that does not include light from the light source can be suppressed.

  In this case, the control unit may be configured to adjust an exposure amount with respect to the imaging element by adjusting an opening / closing cycle of the shutter. In this way, the exposure amount can be adjusted smoothly.

  In the imaging device according to this aspect, the shutter may be a liquid crystal shutter, and the control unit may be configured to ON / OFF control the shutter in a pulse shape. In this way, the shutter can be accurately opened and closed in a short cycle.

  As described above, according to the present invention, it is possible to provide an imaging apparatus capable of effectively suppressing flicker by simple shutter control.

  The effects and significance of the present invention will become more apparent from the following description of embodiments. However, the embodiment described below is merely an example when the present invention is implemented, and the present invention is not limited to what is described in the following embodiment.

FIG. 1A is a diagram illustrating an external configuration of an image management system according to the embodiment. FIG. 1B is a diagram illustrating an example of a captured image according to the embodiment. FIG. 2 is a diagram illustrating a configuration of the imaging apparatus according to the embodiment. FIG. 3 is a diagram illustrating a configuration of the CMOS image sensor according to the embodiment. FIGS. 4A and 4B are diagrams for explaining read control of the CMOS image sensor according to the embodiment. FIG. 5 is a timing chart showing a shutter control method according to the embodiment. FIG. 6 is a timing chart illustrating the shutter control method according to the embodiment. FIG. 7 is a timing chart illustrating a shutter control method according to a comparative example. FIG. 8 is a timing chart illustrating a shutter control method according to a comparative example. FIGS. 9A and 9B are diagrams for explaining a control method of the CMOS image sensor according to the modified example.

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

  FIG. 1A is a diagram illustrating an external configuration of an image management system according to the embodiment.

  As illustrated in FIG. 1A, the image management system includes an imaging device 1 and an external device 2. The imaging device 1 is a surveillance camera, and is installed on the installation object 3 so as to be able to capture images of streets and intersections including traffic lights. The installation object 3 is, for example, an outer wall such as a building, a roof structure, a utility pole, or the like. The imaging device 1 records the captured image on an internal recording medium as needed. The external device 2 is a portable personal computer. In addition, the external device 2 may be another mobile information terminal such as a mobile phone or a tablet.

  The image recorded in the imaging device 1 is collected by the external device 2 as appropriate. The imaging device 1 and the external device 2 can communicate by wireless LAN. The external device 2 establishes a wireless LAN communication path and downloads an image from the imaging device 1. Communication between the imaging device 1 and the external device 2 is not limited to a wireless LAN, and may be another communication method such as Bluetooth.

  FIG. 1B is a diagram illustrating an example of a captured image captured by the imaging apparatus 1. Here, the intersection 5 including the traffic signal 4 is set as the target area. For convenience, FIG. 1B shows only the traffic light 4 that faces the direction of the imaging device 1. The image picked up by the image pickup device 1 is collected by the external device 2 and then used, for example, for verification of a traffic accident. In this verification, the lighting state of the traffic light 4 is confirmed in addition to the situation of vehicles and pedestrians traveling through the intersection 5. That is, it is confirmed whether the traffic light 4 is lit in red, blue, or yellow in the event of an accident.

  FIG. 2 is a diagram illustrating a configuration of the imaging apparatus 1.

  The imaging device 1 includes a lens 10, an iris 20, a shutter 30, an imaging element 40, a control unit 50, a storage unit 60, and a communication unit 70.

  The lens 10 takes in light from the target area and forms an image of the target area on the light receiving surface of the image sensor 40. The iris 20 limits light from the outside so that an appropriate amount of light enters the image sensor 40 according to the intensity of light from the target area. The iris amount of the iris 20 is adjusted by an iris driving circuit 21.

  The shutter 30 is a liquid crystal shutter. The shutter 30 is, for example, a liquid crystal shutter having a so-called normally black characteristic in which the transmittance is maximum when a voltage is applied and the transmittance is reduced when the voltage application is interrupted. In this case, the shutter 30 transmits light when a voltage is applied, and blocks the light when no voltage is applied. In addition, the shutter 30 may be a liquid crystal shutter having a so-called normally white characteristic in which the transmittance is maximum when no voltage is applied and the transmittance is decreased when a voltage is applied. . Further, the shutter 30 may be another type of shutter as long as it can be opened and closed at high speed. The open / close state of the shutter 30 is switched by a drive signal from the shutter drive circuit 31.

  The image sensor 40 is, for example, a CMOS image sensor. The image sensor 40 has a photodiode at a position corresponding to each pixel on the light receiving surface. The image pickup device 40 is controlled by the image pickup signal processing circuit 41 so as to accumulate and output charges to the photodiode for each line.

  The control unit 50 includes an arithmetic processing circuit such as a CPU (Central Processing Unit) and controls each unit according to a program held in the storage unit 60. The storage unit 60 holds a control program and is also used as a work area for control by the control unit 50. The control unit 50 controls the iris driving circuit 21, the shutter driving circuit 31, and the imaging signal processing circuit 41 by the program held in the storage unit 60. The communication unit 70 communicates with the external device 2 illustrated in FIG.

  FIG. 3 is a diagram schematically illustrating the configuration of the image sensor 40. For convenience, FIG. 3 shows the configuration of portions corresponding to nine pixels, but in reality, similar configurations are arranged corresponding to a predetermined number of pixels in the vertical and horizontal directions.

  The image sensor 40 has a photodiode 40a at a position corresponding to each pixel. When the photodiode 40a receives light, the photodiode 40a accumulates charges according to the amount of received light. The accumulated electric charge is converted into a voltage by the amplifier 40b and amplified. The amplified voltage is transmitted to the vertical signal line 40d for each line L when the switch 40c is turned on. The transmitted voltage is temporarily stored by the column circuit 40e arranged for each vertical signal line 40d. The stored voltage is sent to the horizontal signal line 40g when the column selection switch 40f is turned on. Then, the voltage sent to the horizontal signal line 40g is sent to the imaging signal processing circuit 41. As described above, the image sensor 40 transmits a voltage signal for each line L.

  Further, the image pickup device 40 is controlled so that charge is stored in the photodiode 40a for each line L. That is, the photodiode 40a on one line L is set in a state in which charge can be accumulated for a predetermined period, and after this period, the charge generated in each photodiode 40a on the line L is output. The This control is sequentially performed from the uppermost line L to the lowermost line L. When light is irradiated to the photodiode 40a on the line L when the line L is in a state where charge can be accumulated, the charge corresponding to the amount of the irradiated light is changed to each photodiode 40a on the line. Accumulated in. The charges accumulated in this way are read for each line L as described above, converted into a voltage signal, and output to the imaging signal processing circuit 41.

  Hereinafter, a period in which each line is set in a state where charge can be accumulated is referred to as a “charge accumulation period”.

  Returning to FIG. 2, the imaging signal processing circuit 41 sequentially sets each line on the imaging element 40 to the charge accumulation period, and reads out the charge for each line. The imaging signal processing circuit 41 includes an A / D conversion circuit, converts a voltage signal for each line supplied from the imaging element 40 via the horizontal signal line 40g (see FIG. 3) into a digital signal, and controls the control unit 50. Output to. The control unit 50 stores the digital signal (luminance signal) supplied from the imaging signal processing circuit 41 in the storage unit 60. In this way, one captured image is formed from the luminance signals for all lines (for one frame) output from the imaging signal processing circuit 41.

  FIGS. 4A and 4B are diagrams illustrating the reading control of the image sensor 40. FIG. 4A is a diagram schematically showing control (hereinafter referred to as “normal read mode”) in the case where charges are read from each line at a normal speed, and FIG. It is a figure which shows typically the control (henceforth "high-speed read mode") in the case of reading an electric charge from each line.

  On the left side of FIGS. 4A and 4B, the light receiving surface of the image sensor 40 and each line L are schematically shown. Here, the uppermost line L is L0, and the lowermost line is Ln. Also, the control timing for each line is schematically shown on the right side of FIGS. 4 (a) and 4 (b).

  Referring to FIG. 4A, in the normal read mode, control for the uppermost line L0 starts at timing t1 and ends at timing t2. The control for the line L2 that is one step below starts after a predetermined time from the timing t1. In this way, each time the line L changes to the lower stage, the control for each line is sequentially performed while the start timing is delayed by a predetermined time. The start timing of the lowermost line Ln is a timing t2 delayed by Δt from the timing t1.

  In the uppermost line L0, charges are accumulated between the timing t1 and the timing t2. For example, the entire period Δt between the timing t1 and the timing t2 is the charge accumulation period. The charge accumulation period is similarly set for the other lines L. At the timing t2 when the period Δt has elapsed from the timing t1, the charge is read from the uppermost line L0.

  For the second-stage line L1, charge accumulation is started at a timing delayed by a predetermined time from the timing t1, and charge reading is executed at a timing delayed by a predetermined time from the timing t2. Thus, every time the line L changes, the charge accumulation start timing is delayed by a predetermined time, and the charge read execution timing is also delayed by a predetermined time. The charge accumulation start timing for the lowermost line Ln is a timing t2 delayed by Δt from the timing t1, and the charge read execution timing is a timing t3 delayed by Δt from the timing t2.

  Thus, in the normal read mode, the charge accumulation end timing for the uppermost line L0 is the charge accumulation start timing for the lowermost line Ln. For this reason, in the normal read mode, a period in which the charge accumulation periods of all lines overlap does not occur.

  Referring to FIG. 4B, in the high-speed read mode, the amount of deviation of the control start timing between the lines L is shortened compared to the normal read mode by increasing the charge read speed for each line L. In the example of FIG. 4B, the shift amount of the control start timing between the lines L is reduced by half compared to the normal read mode. Therefore, the control start timing for the lowermost line Ln is delayed by Δt / 2 from the control start timing t1 for the uppermost line L0.

  The charge reading speed for each line L is increased by reducing the number of bits when sampling (A / D conversion) the charge signal of each line, compared to the number of bits in the normal reading mode. This process is performed by the imaging signal processing circuit 41 under the control of the control unit 50 in FIG. In the high-speed readout mode, the number of sampling bits is reduced in this way, so that the image quality of the captured image is slightly degraded as compared with the normal readout mode. However, this deterioration is such that there is no particular problem in visibility in applications such as surveillance cameras. Alternatively, the number of sampling bits can be reduced to the same number by improving and speeding up the imaging device 40 and the imaging signal processing circuit 41.

  As described above, by setting the control mode for the image sensor 40 to the high-speed reading mode, as shown in FIG. 4B, an overlapping accumulation period in which the charge accumulation periods of all the lines overlap with each other occurs. Then, by performing exposure during this overlapping accumulation period, each line L is irradiated with light from the target region at the same timing, and charges are applied to the photodiodes 40a on all the lines L at the same timing and exposure amount. It will be accumulated. For this reason, it can suppress that distortion arises in the picked-up image of the to-be-photographed subject. That is, the rolling shutter phenomenon is suppressed, and a global shutter function using the image sensor 40 is realized.

  In the present embodiment, the control mode of the image sensor 40 is set to the high-speed reading mode. Then, the shutter 30 is repeatedly opened and closed over the entire overlapping accumulation period, and light from the target area is guided to the image sensor 40.

  FIG. 5 is a timing chart showing a method for controlling the shutter 30.

  The uppermost part of FIG. 5 shows the voltage waveform of the commercial AC power supply. Here, it is assumed that the frequency of the commercial AC power supply is 50 Hz. In this case, the period T1 of the voltage waveform of the commercial AC power supply is 1/50 second. When light emitting diodes are used for the light sources of the respective colors of the traffic light 4 in FIG. 1B, the light emitting diodes are voltages obtained by full-wave rectifying the AC voltage of the commercial AC power supply as shown in the second stage from the top in FIG. It is driven by. The period T2 of the full-wave rectified voltage waveform is 1/100 second. The light emitting diode is lit in a period T3 in which the full-wave rectified voltage exceeds the lighting threshold SH1. Accordingly, the signal lights of the respective colors of the traffic light 4 in FIG. 1B blink at a cycle T2, that is, a 1/100 second cycle.

  On the other hand, the image sensor 40 forms a captured image for one frame at a period of 1/60 seconds. That is, the imaging cycle T4 of the imaging device 1 is 1/60 second, and the phase is shifted from 1/100, which is the blinking cycle of the signal lights of the respective colors of the traffic light 4. For this reason, when an exposure period having a predetermined time width is set at a fixed position in the overlapping accumulation period shown in FIG. 4B, the time width in which the exposure period and the lighting period of the traffic light 4 (light emitting diode) overlap each other is set for each frame. To change. For this reason, the brightness of the captured image of the traffic light 4 varies between frames, and flicker occurs in the captured image of the traffic light 4.

  FIG. 7 is a timing chart schematically showing the amount of light received by the image sensor 40 when light from the traffic light 4 (light emitting diode) is received when an exposure period of a predetermined time width is set at a fixed position of the imaging cycle T4. It is. Here, at the end of the imaging cycle T4, the shutter 30 is opened for the time width T7, and the exposure period is set. In this case, periods T81 to T83 in which light from the traffic light 4 (light emitting diode) is taken into the image sensor 40 vary between frames. For this reason, as schematically shown in the lowermost stage of FIG. 7, the amount of light received by the image sensor 40 with respect to the light from the traffic light 4 (light emitting diode) varies greatly from frame to frame. As a result, flicker occurs in the image of the traffic light 4.

  FIG. 8 is a timing chart schematically showing the amount of light received by the image sensor 40 when the light from the traffic light 4 (light emitting diode) is received when the time width T7 of FIG. 7 is shortened. For example, the time width T7 (shutter speed) is shortened when the target area is bright, such as in the daytime in fine weather. Also in this case, as in FIG. 7, the shutter 30 is opened by the time width T7 at the end of the imaging cycle T4, and the exposure period is set. In this case, the periods T81 and T82 in which light from the traffic light 4 (light emitting diode) is taken into the image sensor 40 vary between frames. Further, in the third imaging period from the left, the exposure period and the lighting period T3 of the traffic light 4 (light emitting diode) do not overlap, so that light from the traffic light 4 (light emitting diode) is not taken into the imaging element 40.

  Therefore, as schematically shown at the bottom of FIG. 7, the amount of light received by the image sensor 40 with respect to the light from the traffic light 4 (light emitting diode) varies greatly from frame to frame, thereby causing flicker in the captured image of the traffic light 4. . Further, in the frame corresponding to the third imaging period from the left, there is no received light amount of the imaging device 40 with respect to the light from the traffic light 4 (light emitting diode), and thus the captured image of the traffic light 4 in the unlit state.

  In contrast, in the present embodiment, as shown in FIG. 5, the shutter 30 repeats ON / OFF in a pulsed manner at a constant cycle over the entire period of the overlapping accumulation period T5. For this reason, the period T3 during which the traffic light 4 (light emitting diode) is lit is likely to include the opening period of the shutter 30, and a frame in which the traffic light 4 is not lit is less likely to occur than in the case of FIGS. . In FIG. 5, in the periods T61 to T63, the period T3 in which the traffic light 4 (light emitting diode) is lit includes the opening period of the shutter 30. In addition, since the shutter 30 is repeatedly turned on and off, the difference between the frames of the total received light amount in which the light from the traffic light 4 (light emitting diode) is taken into the image sensor 40 is smaller than in the case of FIGS. . Therefore, flicker is less likely to occur in the captured image of the traffic light 4.

  For example, when the target area is bright, such as in the daytime on a sunny day, as shown in FIG. 6, the OFF period of the shutter 30 is lengthened and the ON / OFF cycle of the shutter 30 is lengthened. As a result, the amount of light taken into the image sensor 40 from the target area is reduced. Also in this case, as shown in the lowermost stage of FIG. 6, the light from the traffic light 4 (light emitting diode) is reliably taken into the image sensor 40. Moreover, the difference between the frames of the total received light quantity in which the light from the traffic light 4 (light emitting diode) is taken into the image sensor 40 becomes small. Therefore, flicker is less likely to occur in the captured image of the traffic light 4.

<Effect of embodiment>
According to this embodiment, the following effects are produced.

  As shown in FIGS. 5 and 6, since the imaging device 40 is exposed a plurality of times within one frame imaging cycle T4, even when imaging the traffic light 4 blinking in a short cycle, the traffic light 4 in each imaging cycle T4. Is easily received by the image sensor 40, and the total amount of light received from the traffic light 4 is suppressed from greatly differing between frames. Therefore, flicker occurring in the captured image of the traffic light 4 can be effectively suppressed. Further, this effect can be realized by simple control such as opening and closing the shutter 30 a plurality of times within the imaging cycle. Therefore, according to the present embodiment, it is possible to provide the imaging device 1 that can effectively suppress flicker by simple shutter control.

  In addition, the image sensor 40 accumulates and outputs charges corresponding to the amount of received light for each line L, and the control unit 50 operates at high speed so that a part of the charge accumulation period in each line L on the image sensor 40 overlaps each other. The image sensor 40 is controlled in the readout mode. Then, the control unit 50 opens the shutter 30 a plurality of times within the overlapping accumulation period T5 in which the charge accumulation periods for all the lines L overlap each other. Thus, since the image sensor 40 is exposed during the overlapping accumulation period T5, the light of the target area is irradiated to all the lines L at the same timing and exposure period. For this reason, even when a subject moving at high speed is included in the target area, the captured image of the subject is not distorted.

  Further, the control unit 50 repeats opening and closing of the shutter 30 over the entire overlap accumulation period T5. Thereby, the opening period of the shutter 30 is easily included in the lighting period of the traffic light 4 blinking in a short cycle, and the light from the traffic light 4 is more easily received by the image sensor 40. Therefore, the generation of a frame that does not include light from the traffic light 4 can be suppressed.

  As shown in FIG. 6, the control unit 50 adjusts the exposure amount for the image sensor 40 by adjusting the opening / closing cycle of the shutter 30. Thereby, the exposure amount can be adjusted smoothly.

  The shutter 30 is a liquid crystal shutter, and the control unit 50 controls the shutter 30 to be turned on and off in a pulse shape. Thereby, opening and closing of the shutter 30 can be accurately performed in a short cycle.

<Example of change>
In the above embodiment, as shown in FIG. 4B, the overlapping accumulation period is generated by setting the control mode of the image sensor 40 to the high-speed readout mode. However, as shown in FIG. The overlapping accumulation period may be generated by setting the control mode of the element 40 to the low speed mode. In the low speed mode, the imaging period of each line is set to twice the normal readout mode shown in FIG. 9A, that is, 2Δt. Also in this case, the shutter 30 is controlled so as to repeat ON / OFF at a constant cycle, for example, over the entire overlap accumulation period. This also suppresses flicker that occurs in the captured image of the traffic light 4 and prevents the captured image including the traffic light 4 in the unlit state from being obtained, as in the above embodiment.

  The embodiment and the modification of the present invention have been described above. However, the present invention is not limited to the embodiment and the modification, and the embodiment of the present invention can be variously modified in addition to the above. Is possible.

  For example, in the above-described embodiment, a global shutter function is realized using a rolling shutter type CMOS image sensor as the image sensor 40, but a global shutter type CCD image sensor may be used as the image sensor 40. In this case, the shutter 30 is set to the transmission state a plurality of times in the imaging period of one frame, and preferably, the shutter 30 is repeatedly turned on and off at a constant cycle throughout the imaging period of one frame. Be controlled.

  In the above embodiment, the shutter 30 is controlled to repeat ON / OFF over the entire overlap accumulation period. However, the shutter 30 repeats ON / OFF in a part of the overlap accumulation period. It may be controlled as follows. Also in this case, it is preferable to set the period in which the shutter 30 repeats ON / OFF as long as possible so that the ON period of the shutter 30 is easily included in the light emitting period of the light emitting diode.

  In the above embodiment, the repetition cycle of ON / OFF of the shutter 30 is constant, but the repetition cycle may not necessarily be constant as long as the shutter is turned ON / OFF a plurality of times.

  Moreover, in the said embodiment, although the imaging object was the signal apparatus 4, the imaging object does not necessarily need to be the signal apparatus 4, and may be another light emission source which blinks in a short cycle.

  Moreover, in the said embodiment, although the imaging device 1 was installed in the outer wall, such as a building, a rooftop structure, an electric pole, etc., the structure of the imaging device 1 may be included in a streetlight etc. integrally, for example.

  The imaging device 1 is not limited to the monitoring camera, and may be another imaging device including an imaging unit and a storage unit.

  In addition, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.

DESCRIPTION OF SYMBOLS 1 ... Imaging device 10 ... Lens 30 ... Shutter 40 ... Imaging element 50 ... Control part

Claims (5)

An image sensor;
A lens that focuses light from a target area on the image sensor;
A shutter disposed on the target area side with respect to the image sensor;
A control unit,
The control unit opens the shutter a plurality of times within an imaging period of one frame and guides light captured by the lens to the imaging element.
An imaging apparatus characterized by that. The imaging device according to claim 1,
The imaging device accumulates and outputs charges corresponding to the amount of received light for each line,
The controller is
Controlling the image sensor so that a part of the charge accumulation period in each line on the image sensor overlaps each other;
An image pickup apparatus, wherein the shutter is opened a plurality of times within an overlapping accumulation period in which charge accumulation periods of all the lines overlap each other. The imaging device according to claim 2,
The image pickup apparatus, wherein the control unit repeats opening and closing of the shutter over the entire period of the overlapping accumulation period. The imaging device according to claim 3.
The said control part adjusts the exposure amount with respect to the said image pick-up element by adjusting the opening-and-closing period of the said shutter, The imaging device characterized by the above-mentioned. In the imaging device according to any one of claims 1 to 4,
The shutter is a liquid crystal shutter,
The image pickup apparatus, wherein the control unit performs ON / OFF control of the shutter in a pulse shape.

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