JP2023040311A - camera system - Google Patents

Abstract

To provide a camera system capable of obtaining a highly-accurate image by using a camera device mounted in a mobile body.SOLUTION: A camera system 100 includes a drone 105 and a camera device 1 attached to the drone 105. The camera device 1 includes: a variable ND filter; a sensor for detecting at least either brightness or temperature at a place at which the variable ND filter is provided, or spectral characteristics of the variable ND filter; and a control circuit for controlling the variable ND filter. The control circuit controls the variable ND filter according to at least either the brightness, the temperature, or the spectral characteristics detected by the sensor.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a camera system equipped with a camera device having an optical filter.

WO2017/179378 describes a spectral camera control system. A spectral camera control system comprises a spectral camera mounted on an air vehicle. The spectrum camera is a camera for photographing the ground surface, and is attached to the aircraft so as to face vertically downward. A spectral camera has a lens group, a depolarizer, a liquid crystal tunable filter, and an image sensor.

The spectral camera control system has a liquid crystal tunable filter control circuit for controlling the liquid crystal tunable filter and a spectral camera controller. The liquid crystal wavelength tunable filter has a configuration in which a plurality of plate-shaped liquid crystal elements and plate-shaped polarizing elements are superimposed on each other. In each liquid crystal element, the alignment state is independently controlled by the applied voltage supplied from the liquid crystal tunable filter control circuit.

Therefore, the liquid crystal wavelength tunable filter can transmit light of any wavelength by combining the alignment state of the liquid crystal element and the polarizing element. Upon receiving the wavelength characteristic signal from the spectrum camera control device, the liquid crystal wavelength tunable filter control circuit supplies an applied voltage corresponding to the wavelength specifying signal to the liquid crystal element of the liquid crystal wavelength tunable filter. The liquid crystal wavelength tunable filter switches the transmission wavelength according to the input applied voltage.

WO2017/179378

By the way, a camera system attached to a moving body like the spectrum camera control system described above is used for maintenance of a photovoltaic panel. Maintenance of photovoltaic panels is essential because photovoltaic panels are installed outdoors and there are various factors that reduce power generation efficiency. Therefore, it is conceivable to inspect the photovoltaic panel using a camera device mounted on a moving body such as a drone.

By the way, in the inspection of the photovoltaic panel, the appearance inspection may be difficult due to the light reflected from the panel surface. Also, in camera devices for this type of inspection, a fixed type filter may be used to suppress local reflections. Various types of filters can be used, but the liquid crystal wavelength tunable filter described above has the problem that the desired resolution cannot be obtained. For example, the liquid crystal tunable filter cannot achieve the resolution of a 4K camera in principle. Therefore, there is room for improvement in the accuracy of images obtained from camera devices mounted on moving bodies.

An object of the present disclosure is to provide a camera system capable of obtaining a highly accurate image using a camera device mounted on a mobile object.

A camera system according to the present disclosure includes a mobile body and a camera device attached to the mobile body, and the camera device includes a variable ND filter, and brightness, temperature, and a sensor for detecting at least one of spectral characteristics of the variable ND filter; and a control circuit for controlling the variable ND filter, wherein the control circuit detects at least brightness, temperature, and spectral characteristics detected by the sensor. A variable ND filter is controlled according to either.

This camera system has a camera device, and the camera device has a variable ND filter, a sensor, and a control circuit. By providing a variable ND filter, it is possible to support the resolution of a 4K camera. Furthermore, the sensor detects at least one of the brightness of the location where the variable ND filter is arranged, the temperature of the location where the variable ND filter is arranged, and the spectral characteristics of the variable ND filter. A control circuit controls the variable ND filter according to at least one of brightness, temperature, and spectral characteristics detected by the sensor. Therefore, since the variable ND filter is controlled according to at least one of the brightness, temperature, and spectral characteristics of the shooting environment, it is possible to perform control according to the situation in which the variable ND filter is placed. Therefore, a highly accurate image can be obtained by controlling the variable ND filter according to at least one of brightness, temperature, and spectral characteristics of the variable ND filter.

The moving object described above may be a drone. In this case, since the above-described camera device is attached to the drone, it is possible to acquire an image of the photovoltaic panel or the like with high accuracy while flying the drone.

According to the present disclosure, a highly accurate image can be obtained using a camera device mounted on a mobile object.

1 is a perspective view showing an example of a moving body of a camera system according to an embodiment; FIG. 2 is a perspective view of a solar panel, which is an example of an object to be photographed by the camera system of FIG. 1; FIG. 2 is a diagram schematically showing a camera device of the camera system of FIG. 1; FIG. 4 is a diagram schematically showing a variable ND filter, a sensor and a control circuit of the camera device of FIG. 3; FIG. FIG. 5 is a front view showing an example of a cell fixing frame of the variable ND filter of FIG. 4; 5 is a diagram schematically showing a cross section of the variable ND filter of FIG. 4; FIG. 4 is a diagram schematically showing a table of waveform information stored in a storage unit of the camera device of FIG. 3; FIG. 8 is a diagram showing an example of waveform information stored in the table of FIG. 7; FIG. FIG. 11 is a side view showing an example of a mobile body according to a modification;

Embodiments of a camera system according to the present disclosure will be described below with reference to the drawings. Elements that are the same or correspond to the description of the drawings are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate. The drawings may be partially simplified or exaggerated for ease of explanation, and dimensional ratios and the like are not limited to those shown in the drawings.

FIG. 1 shows a drone 105, which is a moving object of a camera system 100 according to this embodiment. Exemplary camera system 100 comprises camera device 1 and drone 105 . The drone 105 includes a body portion 105b positioned in the center of the drone 105, a plurality of extension portions 101 radially extending from the body portion 105b, and a plurality of extension portions 101 positioned at the ends of the extension portions 101 opposite to the body portion 105b. and a plurality of propeller portions 103 supported by the support portion 102 . The camera device 1 is mounted, for example, on the main body 105b of the drone 105 .

The drone 105 is, for example, a mobile object that can fly by remote control, and is used for inspection of the photovoltaic panel P illustrated in FIG. 2 . Since the photovoltaic panel P is installed outdoors and is easily affected by the external environment and has various factors that reduce power generation efficiency, inspection and maintenance of the photovoltaic panel P is essential.

A drone 105 equipped with the camera device 1 of the camera system 100 flies toward the photovoltaic panel P in order to photograph the photovoltaic panel P, for example. The camera device 1 acquires a highly accurate image of the photovoltaic panel P by photographing the photovoltaic panel P with high accuracy. As a result, since a clearer image of the photovoltaic panel P can be obtained, the inspection of the photovoltaic panel P can be performed more accurately.

FIG. 3 is a diagram schematically showing the configuration of the camera device 1. As shown in FIG. As shown in FIG. 3, the camera device 1 includes a lens 2 that forms an image of incident light, a variable ND filter 10, and an imaging device that has a CCD (charge-coupled device) that photoelectrically converts the light incident from the lens 2. 3 , a control circuit 4 , a display section 5 and a sensor 6 .

Light enters the lens 2 , and the light transmitted through the lens 2 forms an image on the imaging element 3 . Note that although one lens 2 is illustrated in FIG. 3 , the camera device 1 may include a plurality of lenses 2 . The imaging element 3 may be configured by, for example, a CCD element or a CMOS (Complementary Metal-Oxide Semiconductor) element.

The control circuit 4 constitutes a microcomputer having a CPU and a storage section 4b including ROM, RAM and the like. The control circuit 4 is electrically connected to the variable ND filter 10 and controls the variable ND filter 10 by outputting a control signal to the variable ND filter 10 . A variable ND filter 10 is provided between the lens 2 and the imaging device 3 . The variable ND filter 10 may include, for example, an infrared cut filter (IR cut filter) and a neutral density filter (ND filter).

The display unit 5 displays filter information indicating the state of the variable ND filter 10 . In the present disclosure, “filter information” refers to information of the variable ND filter 10 itself, such as light transmittance, brightness, exposure, or spectral characteristics of the variable ND filter 10. It may also include environmental information of the location where the variable ND filter 10 is arranged, such as the temperature of the location. Since the camera device 1 is provided with the display unit 5 in this manner, the user (photographer, etc.) of the camera device 1 can easily grasp the filter information of the variable ND filter 10 .

The sensor 6 detects environmental information at the location where the variable ND filter 10 is arranged. In the present disclosure, “environmental information” includes brightness (brightness or illuminance), spectral characteristics, and temperature, and includes information that can affect the operation of the variable ND filter 10 . “Spectral characteristics” indicates the ratio of energy for each wavelength of light (also referred to as spectral distribution). The sensor 6 includes, for example, a brightness detection sensor 6b that detects brightness, a temperature detection sensor 6c that detects temperature, and a spectral characteristic detection sensor 6d that detects spectral characteristics.

FIG. 4 is a perspective view schematically showing an example of arrangement of components inside the camera device 1. As shown in FIG. As shown in FIGS. 3 and 4, inside the camera device 1, a cell fixing frame 7 for fixing the variable ND filter 10 is provided. For example, the cell fixing frame 7 is made of metal. As an example, the cell fixing frame 7 may be made of aluminum and subjected to alumite treatment.

The cell fixing frame 7 has a hole portion 7b to which the variable ND filter 10 is fixed, and the variable ND filter 10 is fixed to the cell fixing frame 7 so that the front and back surfaces of the variable ND filter 10 are exposed from the hole portion 7b. The brightness detection sensor 6 b is, for example, a photodiode, photoelectrically converts the light L emitted by the light source 8 provided inside the camera device 1 , and outputs the light to the control circuit 4 . The light source 8 is, for example, an LED.

As an example, the temperature detection sensor 6c is a non-contact thermometer, but various thermometers can be used as the temperature detection sensor 6c. The spectral characteristic detection sensor 6d is a sensor that measures the spectral characteristic of light passing through the variable ND filter 10. For example, it measures the amount of light for each wavelength of the light passing through the variable ND filter 10, and outputs the measurement result as a measurement signal. Output to the control circuit 4 .

FIG. 5 is a plan view showing an exemplary cell fixing frame 7. FIG. As shown in FIG. 5, the cell fixing frame 7 has a hole portion 7b to which the variable ND filter 10 is fixed, and a through hole 7c to which the brightness detection sensor 6b and the light source 8 are fixed. As an example, the cell fixing frame 7 has a rectangular shape with a notch 7d at one corner, and a rectangular hole 7b is formed in a portion including the center of the cell fixing frame 7 .

For example, if the vertical length of the hole 7b is h and the horizontal length of the hole 7b is w, the value of h is 40 mm and the value of w is 30 mm. The through hole 7c is formed on one side (upper side) in the vertical direction (longitudinal direction) of the hole portion 7b, and has, for example, a horizontally long rectangular shape. However, the shape, size and material of each part of the cell fixing frame 7 are not limited to the examples described above, and can be changed as appropriate.

FIG. 6 is a cross-sectional view showing an example of details of the variable ND filter 10. As shown in FIG. As shown in FIG. 6, the variable ND filter 10 includes a pair of transparent electrodes 11 facing each other, a pair of transparent substrates 12 sandwiching the pair of transparent electrodes 11, and an electrolytic substrate accommodated in the gap between the pair of transparent electrodes 11. A liquid 13 and a sealing material 14 for sealing the gap between the pair of transparent electrodes 11 are provided.

Each of the pair of transparent electrodes 11 is, for example, a transparent conductive film forming an electrode pair. In this case, each transparent electrode 11 is formed as a film on each transparent substrate 12 . The transparent electrode 11 may be sandwiched between the transparent substrates 12 by clip electrodes. The transparent electrode 11 is made of, for example, at least one of indium tin oxide (ITO: Indium Tin Oxide), tin oxide, and zinc oxide. Each of the pair of transparent electrodes 11 is connected to a drive circuit 15 (electric circuit).

The transparent substrate 12 has, for example, a rectangular plate shape. The transparent substrate 12 may be made of glass or resin. The transparent substrate 12 has an inner surface 12b with which the transparent electrode 11 contacts, and an outer surface 12c facing the opposite side of the inner surface 12b. For example, the inner surface 12b and the outer surface 12c are both smooth surfaces. An antireflection film may be provided on the outer surface 12c.

In order to connect each transparent electrode 11 to the driving circuit 15, the positions of the pair of transparent substrates 12 when viewed from the out-of-plane direction D1 of the inner surface 12b and the outer surface 12c are shifted from each other. Thereby, a part of each transparent substrate 12 protrudes outside of the inner surface 12b and the outer surface 12c in the in-plane direction D2. A sealing material 14 surrounds the space between the pair of transparent electrodes 11 . The electrolyte 13 contained in the region surrounded by the pair of transparent substrates 12 , the pair of transparent electrodes 11 and the sealing material 14 constitutes the light transmission region of the variable ND filter 10 .

The electrolytic solution 13 is, for example, a liquid containing at least one of silver ions and copper ions in a solvent containing methanol. As an example, the electrolytic solution 13 is an electrolytic solution containing propylene carbonate and methanol as solvents and AgNO ₃ (silver nitrate), CuCl ₂ (cupric chloride) and LiBr (lithium bromide) as solutes.

For example, the weight of silver nitrate contained in the electrolytic solution 13 is greater than the weight of cupric chloride contained in the electrolytic solution 13 . A thickening agent may be added to the electrolytic solution 13 . Thickeners may be constituted by polymers such as, for example, polypropylene, polyvinyl butyral or polymethyl methacrylate.

The driving circuit 15 includes a first lead wire 15b electrically connected to one of the pair of transparent electrodes 11, a second lead wire 15c electrically connected to the other of the pair of transparent electrodes 11, and a second lead wire 15c electrically connected to the other of the pair of transparent electrodes 11. 1 lead wire 15b and a switch circuit 15d provided on the opposite side of each transparent electrode 11 of the second lead wire 15c.

The switch circuit 15d has a DC power supply 15f, a first switch 15g connected in series with the DC power supply 15f, and a second switch 15h connected in parallel with the first switch 15g. The first switch 15g and the second switch 15h may, for example, interlock with each other and be turned on/off in opposite directions.

That is, when the first switch 15g is ON, the second switch 15h may be OFF, and when the first switch 15g is OFF, the second switch 15h may be ON. Alternatively, both the first switch 15g and the second switch 15h may be turned off. In this way, the mode of the switch that constitutes the switch circuit 15d can be changed as appropriate.

For example, when the first switch 15g is OFF, no current flows through the first lead wire 15b and the second lead wire 15c, and no voltage is generated between the pair of transparent electrodes 11. FIG. That is, since there is no potential (floating potential) between the pair of transparent electrodes 11, metal cations (eg Ag ⁺ , Cu ²⁺ ) and anions (eg NO ³⁻ , Cl ⁻ ) in the electrolyte 13 are dispersed. state.

Therefore, the electrolytic solution 13 is almost colorless and transparent. In the light transmission region of the variable ND filter 10, the entire thickness direction of the variable ND filter 10 extends from the one transparent substrate 12 and the transparent electrode 11 to the other transparent electrode 11 and the transparent substrate 12 including the electrolytic solution 13. Almost colorless and transparent. That is, when the voltage between the pair of transparent electrodes 11 is in a released state (a state in which no voltage is applied), the variable ND filter 10 has uniform optical characteristics in the light transmission region.

When the second switch 15h is turned off and the first switch 15g is turned on, a current flows through the first lead wire 15b and the second lead wire 15c, and a voltage is applied between the pair of transparent electrodes 11. occurs. At this time, a voltage is applied between the pair of transparent electrodes 11 so that one transparent electrode 11 is set as a positive electrode and the other transparent electrode 11 is set as a negative electrode.

An electric field E is generated from the transparent electrode 11 set as the positive electrode toward the transparent electrode 11 set as the negative electrode. The direction of the electric field E substantially coincides with the thickness direction of the variable ND filter 10 . Due to this electric field E, metal cations (eg, Ag ⁺ , Cu ²⁺ ) in the electrolytic solution 13 move to the transparent electrode 11 set as the negative electrode and are reduced.

As a result, a deposition layer containing, for example, silver and copper is formed on the transparent electrode 11 to form a low transmittance surface with low light transmittance. When the transparent electrode 11 is not formed with the low-transmittance surface, the variable ND filter 10 can be put in the same state as without a filter, and when the transparent electrode 11 is formed with the low-transmittance surface, the variable ND filter 10 can be used. function can be exhibited.

The switch circuit 15d is connected to the control circuit 4 described above, and the control circuit 4 controls the switch circuit 15d so that the voltage applied between the pair of transparent electrodes 11 is variable. The light transmittance, brightness, color and spectral characteristics of the variable ND filter 10 are adjusted by varying the voltage applied between the pair of transparent electrodes 11 . That is, the variable ND filter 10 is driven by a voltage to adjust, for example, light transmittance, brightness, color, spectral characteristics, and the like.

As shown in FIG. 7, the storage unit 4b of the control circuit 4 has a table B in which waveform information W1 to W36 of the voltage applied to the variable ND filter 10 is stored in advance. The control circuit 4 selects the waveform information W1 to W36 stored in the table B according to the environmental information (for example, brightness or temperature) of the variable ND filter 10 detected by the sensor 6, and the selected waveform information W1 ˜W36 to the variable ND filter 10. FIG. The control circuit 4 may select the waveform information stored in the table according to the brightness, temperature and spectral information as the environmental information of the variable ND filter 10 detected by the sensor 6 . In this case, the control circuit 4 selects waveform information from a table with three axes of brightness, temperature and spectral information.

For example, the table B stores a plurality of waveform information W1 to W36, among the environmental information detected by the sensor 6, which are different for each brightness and each temperature. The waveform information W1 to W36 are drive patterns that are prepared in advance, and drive patterns for the variable ND filter 10 that are most suitable for the detected environmental information.

As shown in FIGS. 7 and 8, each of the waveform information W1-W36 includes waveform information of, for example, a rectangular wave. Table B stores waveform information W1 to W36 having different periods T, amplitudes F, and duty ratios (D/T). The waveforms stored in Table B are not limited to rectangular waves, and may be other waveform information such as sine waves. Also, the table B may include waveform information with an amplitude F value of zero (having no wave such as a substantial pulse).

As an example, the environmental information includes six levels of brightness and six levels of temperature. is 5, the control circuit 4 selects the waveform information W17 from the table B;

When the brightness level detected by the brightness detection sensor 6b is 6 and the temperature level detected by the temperature detection sensor 6c is 2, the control circuit 4 selects the waveform information W32 from the table B. The control circuit 4 outputs any one of the waveform information W1 to W36 selected as described above to the variable ND filter 10 to control the operation of the variable ND filter 10. FIG.

Next, the effects obtained from the camera system 100 according to this embodiment will be described in detail. A camera system 100 includes a camera device 1 , and the camera device 1 includes a variable ND filter 10 , a sensor 6 and a control circuit 4 . By providing the variable ND filter 10, it is possible to cope with the resolution of a 4K camera. Further, the sensor 6 detects a variable ND in accordance with at least one of the brightness of the location where the variable ND filter 10 is arranged, the temperature of the location where the variable ND filter 10 is arranged, and the spectral characteristics of the variable ND filter 10. Controls filter 10 .

Therefore, since the variable ND filter 10 is controlled according to at least one of the brightness, temperature, and spectral characteristics of the imaging environment, it is possible to control the variable ND filter 10 in accordance with the situation in which it is placed. Therefore, by controlling the variable ND filter 10 according to at least one of brightness, temperature, and spectral characteristics of the variable ND filter 10, a highly accurate image can be obtained.

In the present embodiment, the moving object on which the camera device 1 is mounted is the drone 105 . Therefore, since the camera device 1 is attached to the drone 105, an image of the photovoltaic panel P or the like can be acquired with high accuracy while the drone 105 is flying. That is, even when the drone 105 flies over the photovoltaic panel P and takes an image of the photovoltaic panel P, a highly accurate image of the photovoltaic panel P can be obtained without being affected by the external environment. Obtainable.

In the camera device 1, waveform information W1 to W36 of voltages for driving the variable ND filter 10 are stored in the storage section 4b. Further, the sensor 6 detects the environmental information of the location where the variable ND filter 10 is arranged, and the control circuit 4 selects one of the waveform information W1 to W36 according to the detected environmental information, and the variable ND filter 10 to control.

Therefore, the waveform information W1 to W36 of the voltage applied to the variable ND filter 10 can be selected in accordance with the photographing environment, thereby speeding up the response to color change and the like. As a result, responsiveness can be sped up. In addition, since the camera device 1 does not require a moving mechanism for moving the variable ND filter 10 and the like, it is possible to suppress complication of the device. Therefore, the configuration can be simplified.

The sensor 6 includes a brightness detection sensor 6b that detects the brightness of the location where the variable ND filter 10 is arranged, and the control circuit 4 stores the brightness detected by the brightness detection sensor 6b. The waveform information W1 to W36 stored in the section 4b may be selected. In this case, the brightness detection sensor 6b detects the brightness of the location where the variable ND filter 10 is arranged, and the control circuit 4 selects the waveform information W1 to W36 according to the detected brightness. Therefore, since the waveform information W1 to W36 of the voltage to the variable ND filter 10 can be selected according to the brightness of the shooting environment, the optimum waveform information W1 to W36 is selected according to the environmental information such as the shooting environment including the brightness. can do.

The sensor 6 includes a spectral characteristic detection sensor 6d that detects the spectral characteristic of the variable ND filter 10, and the control circuit 4 stores the spectral characteristic detected by the spectral characteristic detection sensor 6d in the storage unit 4b. You may select the waveform information that is available. In this case, since the waveform information of the voltage to the variable ND filter 10 can be selected according to the spectral characteristics of the variable ND filter 10, the spectral characteristics of the variable ND filter 10 can be fed back. Therefore, it is possible to prevent the observed color from being different from the intended color and to improve the responsiveness.

The camera device 1 according to this embodiment may also include a display section 5 that displays filter information indicating the state of the variable ND filter 10 . In this case, filter information such as the transmittance or temperature of the variable ND filter 10 can be displayed on the display unit 5, so that the filter information such as the transmittance can be easily grasped.

The embodiment of the camera system according to the present disclosure has been described above. However, the camera system according to the present disclosure is not limited to the above-described embodiments, and may be modified or applied to other things within the scope of not changing the gist described in each claim. . That is, the configuration of each part of the camera system can be changed as appropriate without changing the gist of the above.

FIG. 9 is a diagram showing a camera system 200 according to a modification. As shown in FIG. 9 , a camera system 200 according to the modification is provided in an aerial work platform 210 . A camera system 200 includes a camera device 1 and an aerial work vehicle 210 . The aerial work vehicle 210 includes, for example, a telescopic boom 201, a hook 202 that moves up and down from the boom 201, a swivel base 204 that swivels the boom 201, a vehicle body 203 that supports the swivel platform 204, and a vehicle body 203 that supports the vehicle body 203 and the ground. and a plurality of outriggers 205 projecting out.

As an example, the camera device 1 is mounted on the tip portion 201 b of the boom 201 . In this case, for example, the camera device 1 can photograph the construction site from the tip portion 201b. Also, the camera device 1 may be mounted near the hook 202 . In this case, the suspended load on the hook 202 and the position of the hook 202 can be photographed with high accuracy by the camera device 1 .

Like the camera system 200 according to the modified example described above, the moving object on which the camera device 1 is mounted includes various objects other than the drone 105 and the aerial work vehicle 210 . For example, the mobile object on which the camera device 1 is mounted may be a transportation device such as a vehicle, a ship, an aircraft, or a rocket, or may be a mobile machine such as the blades of a generator.

In the above-described embodiment, an example was described in which the control circuit 4 selects the waveform information W1 to W36 stored in the table B according to the brightness, temperature, or spectral characteristics (environmental information) of the variable ND filter 10. FIG. However, the control circuit 4 may select waveform information according to, for example, the humidity of the location where the variable ND filter 10 is arranged, and the environmental information may be information other than brightness, temperature, or spectral characteristics. good too. Furthermore, in the above-described embodiment, the example in which the table B for pre-storing the waveform information W1 to W36 is provided in the storage unit 4b has been described. However, the number and types of waveform information stored in the table can be changed as appropriate.

Further, in the above-described embodiment, the camera device 1 constituting the camera system 100 of the drone 105 has been described. However, the camera device according to the present disclosure may be used for other applications such as an in-vehicle camera module, for example. Furthermore, the configuration and function of each part of the camera device are not limited to the above-described embodiments and can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1... Camera apparatus 2... Lens 3... Imaging element 4... Control circuit 4b... Storage part 5... Display part 6... Sensor 6b... Brightness detection sensor 6c... Temperature detection sensor 6d... Spectral characteristic Detection sensor 7 Cell fixing frame 7b Hole 7c Through hole 7d Notch 8 Light source 10 Variable ND filter 11 Transparent electrode 12 Transparent substrate 12b Inner surface 12c Outer surface 13 Electrolyte solution 14 Sealing material 15 Drive circuit 15b, 15c Lead wire 15d Switch circuit 15f DC power supply 15g, 15h Switch 100, 200 Camera system 101 Extension Main part 102 Support part 103 Propeller part 105 Drone (moving body) 105b Body part 201 Boom 201b Tip part 202 Hook 203 Car body 204 Swivel base 205 Outrigger 210... Aerial work vehicle (moving body), B... Table, D1... Out-of-plane direction, D2... In-plane direction, E... Electric field, F... Amplitude, L... Light, P... Photovoltaic panel, T... Period, W1 to W36... Waveform information.

Claims (2)

a mobile object;
a camera device attached to the moving object;
with
The camera device is
a variable ND filter;
a sensor that detects at least one of brightness, temperature, and spectral characteristics of the variable ND filter at a location where the variable ND filter is arranged;
a control circuit that controls the variable ND filter;
has
The control circuit controls the variable ND filter according to at least one of the brightness, the temperature, and the spectral characteristics detected by the sensor.
camera system. The mobile object is a drone,
A camera system according to claim 1 .

Images