CN108156352B - Anti-overexposure device, night vision system and vehicle - Google Patents
Anti-overexposure device, night vision system and vehicle Download PDFInfo
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- CN108156352B CN108156352B CN201611105635.3A CN201611105635A CN108156352B CN 108156352 B CN108156352 B CN 108156352B CN 201611105635 A CN201611105635 A CN 201611105635A CN 108156352 B CN108156352 B CN 108156352B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/71—Circuitry for evaluating the brightness variation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
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Abstract
The invention provides an anti-overexposure device, a night vision system and a vehicle, wherein the night vision system comprises the anti-overexposure device, the anti-overexposure device utilizes a detection circuit to detect illumination light of a preset waveband emitted by a rendezvous vehicle to obtain an optical signal, a control circuit further controls an adjusting component to adjust an illumination area of a light source according to the optical signal detected by the detection circuit, so that the adjusting component adjusts the illumination area of the light source under the control of the control circuit to eliminate the phenomenon of image overexposure caused by the light source to the same active night vision system of the rendezvous vehicle. The embodiment of the invention achieves the purpose of preventing overexposure by adjusting the illumination area of the light source, thereby being applicable to various types of light sources, solving the problem of overexposure of night vision images caused by interaction between two vehicles with the same active night vision system in the prior art, and having high light source utilization rate, low cost and wide applicability.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to an anti-overexposure device, a night vision system and a vehicle.
Background
With the continuous development of night vision systems of vehicles, active infrared night vision systems are increasingly applied to the fields of security monitoring, vehicles and the like, so that the sight distance is increased and the road condition in front is monitored at night or under the condition of poor visibility. Night vision illumination is an indispensable component of an active infrared night vision system and is mainly used for providing light source illumination required by imaging.
However, in practical applications, it is found that when two vehicles have the same night vision system and meet each other, the infrared illumination from the vehicle is directly emitted to the night vision system of the other vehicle, so that the imaging unit in the night vision system of the vehicle can have serious overexposure phenomenon, which affects the imaging of the night vision system.
At present, amplitude modulation, MEMS avoidance and grid block avoidance modes are adopted in the prior art, but the modes are poor in reliability, meanwhile, in the polarization avoidance mode in the prior art, a common light source is a laser infrared light source so as to utilize the polarization characteristic of the laser infrared light source to carry out polarization avoidance, but the light source is extremely low in utilization rate and high in cost, and cannot be widely applied to vehicles.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a night vision system, so as to achieve the purpose of preventing the over exposure of the night vision images during the vehicle intersection without distinguishing the light sources, solve the problem of the over exposure of the night vision images caused by the interaction between the vehicles having the active night vision system in the prior art, and have high light source utilization rate, low cost and wide applicability.
The second purpose of the invention is to provide an anti-overexposure device.
A third object of the invention is to propose a vehicle.
To achieve the above object, a first embodiment of the present invention provides a night vision system for imaging an object by illumination with an infrared light source, including:
the light source and an anti-overexposure device used for controlling an illumination area of the light source;
the anti-overexposure device comprises a detection circuit, a control circuit and an adjusting component;
the detection circuit is used for detecting illumination light of a preset waveband emitted by a rendezvous vehicle to obtain an optical signal;
the control circuit is electrically connected with the detection circuit and used for controlling the adjusting component to adjust the illumination area of the light source according to the optical signal detected by the detection circuit;
the adjusting component is electrically connected with the control circuit and used for changing the optical axis or the light emitting angle of the light source under the control of the control circuit so as to adjust the illumination area of the light source.
The night vision system comprises an anti-overexposure device, wherein the anti-overexposure device detects illuminating light of a preset waveband emitted by a rendezvous vehicle by using a detection circuit to obtain an optical signal, and then a control circuit controls an adjusting assembly to adjust an illuminating area of a light source according to the optical signal detected by the detection circuit, so that the adjusting assembly adjusts the illuminating area of the light source under the control of the control circuit to reduce the interference of the light source on the night vision system of the rendezvous vehicle. The embodiment of the invention achieves the purpose of preventing overexposure by adjusting the illumination area of the light source, thereby being applicable to various types of light sources, solving the problem of overexposure of night vision images caused by interaction between vehicles with an active night vision system in the prior art, and having high light source utilization rate, low cost and wide applicability.
In order to achieve the above object, a second embodiment of the present invention provides an overexposure prevention apparatus, including: the device comprises a detection circuit, a control circuit and an adjusting component;
the detection circuit is used for detecting the illumination light with the preset wave band to obtain an optical signal;
the control circuit is electrically connected with the detection circuit and used for controlling the adjusting component to adjust the illumination area of the light source according to the optical signal detected by the detection circuit;
the adjusting component is electrically connected with the control circuit and used for changing the optical axis or the light emitting angle of the light source under the control of the control circuit so as to adjust the illumination area of the light source.
According to the anti-overexposure device disclosed by the embodiment of the invention, the detection circuit is used for detecting the illumination light of the preset waveband emitted by the rendezvous vehicle to obtain the light signal, and then the control circuit controls the adjusting assembly to adjust the illumination area of the light source according to the light signal detected by the detection circuit, so that the adjusting assembly adjusts the illumination area of the light source under the control of the control circuit, and the interference of the light source on a night vision system of the rendezvous vehicle is reduced. The embodiment of the invention achieves the purpose of preventing overexposure by adjusting the illumination area of the light source, thereby being applicable to various types of light sources, solving the problem of overexposure of night vision images caused by interaction between vehicles with an active night vision system in the prior art, and having high light source utilization rate, low cost and wide applicability.
To achieve the above object, a third embodiment of the present invention provides a vehicle including a night vision system as described in the first aspect.
The vehicle comprises a night vision system with an anti-overexposure device, wherein the anti-overexposure device utilizes a detection circuit to detect illumination light of a preset waveband emitted by a rendezvous vehicle to obtain an optical signal, and then a control circuit controls an adjusting assembly to adjust an illumination area of a light source according to the optical signal detected by the detection circuit, so that the adjusting assembly adjusts the illumination area of the light source under the control of the control circuit to reduce the interference of the light source on the night vision system of the rendezvous vehicle. The embodiment of the invention achieves the purpose of preventing overexposure by adjusting the illumination area of the light source, thereby being applicable to various types of light sources, solving the problem of overexposure of night vision images caused by interaction between vehicles with an active night vision system in the prior art, and having high light source utilization rate, low cost and wide applicability.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a night vision system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of the overexposure prevention device 20;
FIG. 3 is a schematic diagram of the position relationship of the f-theta lens 213;
FIG. 4 is a second schematic view of the structure of the overexposure prevention device 20
FIG. 5 is one of the schematic optical path diagrams;
FIG. 6 is a second schematic diagram of the optical path; and
FIG. 7 is a third schematic diagram of the optical path.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An anti-overexposure device, a night vision system and a vehicle according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a night vision system for imaging an object by illumination with an infrared light source according to an embodiment of the present invention, where the night vision system shown in fig. 1 includes: a light source 11, and an anti-overexposure device 20 for controlling the illumination area of the light source 11.
The overexposure prevention device 20 comprises a detection circuit 21, a control circuit 22 and an adjustment assembly 23.
The detection circuit 21 is configured to detect illumination light of a preset wavelength band emitted by a rendezvous vehicle to obtain an optical signal.
And the control circuit 22 is electrically connected with the detection circuit and is used for controlling the adjusting component 23 to adjust the illumination area of the light source 11 according to the optical signal detected by the detection circuit 21.
And an adjusting component 23 electrically connected with the control circuit and used for adjusting the illumination area of the light source 11 under the control of the control circuit 22 so as to reduce the interference of the light source 11 to the night vision system of the crossing vehicle.
The adjustment of the illumination area of the light source 11 includes two ways, one is to adjust the illumination direction and the optical axis of the light source so as to adjust the illumination area of the light source 11, and the other is to adjust the light emitting angle of the light source so as to adjust the illumination area of the light source 11.
In the foregoing system, since the infrared mode is often adopted for illumination, the light source 11 may be an infrared light source in the specific implementation process, where the infrared light source may be a vertical cavity type or edge emitting type semiconductor laser, or an infrared LED light source, and the emission wavelength is 750nm to 2000 nm.
Therefore, the selection of the light source 11 is not limited to a laser light source, and the method can be applied to various types of light sources, so that the technical problems that the method for preventing overexposure in the prior art can only be applied to special light sources such as laser infrared light sources, and cannot be applied to LED light sources widely used in vehicles are solved, and the night vision system provided by the embodiment of the invention has wide applicability.
The night vision system comprises an anti-overexposure device, wherein the anti-overexposure device detects illuminating light of a preset waveband emitted by a rendezvous vehicle by using a detection circuit to obtain an optical signal, and then a control circuit controls an adjusting assembly to adjust an illuminating area of a light source according to the optical signal detected by the detection circuit, so that the adjusting assembly adjusts the illuminating area of the light source under the control of the control circuit to reduce the interference of the light source on the night vision system of the rendezvous vehicle. The embodiment of the invention achieves the purpose of preventing overexposure by adjusting the illumination area of the light source, thereby being applicable to various types of light sources, solving the problem of overexposure of night vision images caused by interaction between two vehicles with the same active night vision system in the prior art, and having high light source utilization rate, low cost and wide applicability.
For clarity of the construction of the night vision system, the anti-overexposure device 20 will be described in detail below.
As a possible implementation manner of the overexposure prevention apparatus 20, fig. 2 is a schematic structural diagram of the overexposure prevention apparatus 20, and as shown in fig. 2, the detection circuit 21 includes: the detector 211 and the filter 212 arranged on the light incident surface of the detector 211.
The filter 212 is configured to filter the illumination light emitted by the intersection vehicle to transmit the illumination light in the preset wavelength band.
Specifically, if the intersection vehicle adopts the same infrared illumination mode as the light source 11, the filter 212 only transmits the illumination light in the infrared band, and filters out the light sources in other bands, that is, the light sources in other bands are cut off, so as to avoid interference in the subsequent measurement process.
And the detector 211 is configured to perform optical parameter measurement on the illumination light transmitted by the optical filter 212 to obtain an optical signal in the form of a voltage value. The optical parameter here is the luminous flux or the frequency domain position.
In particular, the detector 211 includes a detection array 2110, and in particular the detection array 2110 may be a photo-resistor or array, an optical radiation sensor or array. When the detector 211 performs a light flux measurement on the illumination light transmitted by the filter 212, a light signal in the form of a voltage value is used to indicate the measured light flux.
If the optical parameter is a frequency domain position, the detection circuit 21 further includes an f-theta lens 213, and the f-theta lens 213 is mainly used for implementing fourier transform, so as to implement measurement in the frequency domain.
The f-theta lens 213 is disposed between the filter 212 and the detection array 2110 of the detector 211, and fig. 3 is a schematic diagram illustrating a positional relationship of the f-theta lens 213, as shown in fig. 3, the lens 213, the filter 212 and the detection array 2110 share an optical axis. Thus, the detector 211 performs a frequency domain position measurement of the illumination light transmitted by the filter 212, resulting in an optical signal in the form of a voltage value. The light signal in the form of a voltage value is used to indicate the position in the detection array 2110 at which the illumination light transmitted by the filter 212 falls.
In the schematic structural diagram of the overexposure prevention apparatus 20 shown in fig. 2, the control circuit 22 includes: the current-to-voltage converter 221.
Specifically, the current-to-voltage converter 221 is electrically connected to the detection circuit 21, and is configured to output a photocurrent corresponding to a corresponding current value according to a voltage value of the optical signal in the form of a voltage.
The current-to-voltage converter 221 is specifically configured to output a photocurrent having a current value meeting a second threshold value when a voltage value of the light signal in the form of a voltage is higher than the first threshold value, so as to control the adjustment component to adjust the illumination area.
And the adjusting component 23 adjusts the illumination area under the control of the control circuit 22, and two possible implementation forms of the adjusting component 23 are specifically provided in this embodiment.
As a possible implementation manner, the adjusting component 23 adjusts the light-emitting angle of the light source 11, as shown in fig. 2, the adjusting component 23 includes: an electrostrictive 231 and a light shielding plate 232.
The electrostrictive 231 is electrically connected with the current-voltage converter 221, and is used for extending or shortening according to the current value of the photocurrent under the control of the photocurrent so as to drive the light shielding plate 232 to translate.
Specifically, the electrostrictive element 231 may be an electrostrictive element such as a piezoelectric ceramic or an electrostrictive resonator.
The light shielding plate 232 is located in the light emitting direction of the light source, is fixedly connected to the electrostriction device 231, and is used for shielding a part of light emitted by the light source 11 under the driving of the electrostriction device 231 so as to adjust the illumination area of the light source 11.
As another possible implementation manner, the adjusting assembly 23 adjusts the optical axis of the light source 11, fig. 4 is a second schematic structural diagram of the overexposure prevention apparatus 20, and as shown in fig. 4, the adjusting assembly 23 includes: electrostrictive 231 and light source base 234; the light source base 234 is rotatably connected to the electrostrictive 231, and the light source 11 is disposed on the light source base 234.
The electrostrictive 231 is electrically connected to the current-voltage converter 221, and is configured to extend or shorten according to a current value of the photocurrent under control of the photocurrent, so as to drive the light source base 234 to rotate.
The light source base 234 is driven by the electrostriction device 231 to rotate, so as to change the illumination angle of the light source 11, and adjust the illumination area of the light source 11.
For clarity of the adjustment of the illumination area by the adjustment assembly 23 under the control of the control circuit 22, the principle of preventing overexposure will be explained in connection with fig. 2.
When two vehicles with the same night vision system meet on a road, the light source 11 of the night vision system will present a light path as shown in fig. 5, and by defining the light radiation emittance, it can be determined that the luminous flux of the light source 11 conforms to the following formula:
wherein, I0The central light intensity, and θ the light exit angle.
Assuming that the diameter of the light source 11 is a1, the light emitting area corresponds to the following formula:
in the schematic optical path diagram shown in fig. 6, as shown in fig. 6, in the driving state, the infrared illumination for night vision illumination for the vehicle is received by the detector 211, and specifically, according to the schematic optical path diagram shown in fig. 7, it can be seen that the irradiation receiving angle of the infrared illumination for night vision illumination for the vehicle to the detector 211 of the host vehicle conforms to the following formula:
wherein, a is the caliber of the detector 211, d is the vehicle distance, and b is the center distance of the adjacent lanes.
According to the formulas (1) to (3), the functional relation between the angle α of irradiating the vehicle infrared light source to the vehicle and the received light flux phi on the parallel adjacent lanes can be obtained:
as shown in the formula (4), when the detector 211 detects a light flux Φ higher than a certain threshold, the light shielding plate 232 can be controlled to move horizontally, so as to block or display a portion of the light, thereby adjusting the illumination area of the light source 11.
Similarly, when the detection circuit 21 shown in fig. 3 is used, the position d of the crossing vehicle is converted into frequency domain position information on the detector 211 through the f-theta lens 213, then the signal is converted through the current-voltage converter 221, and then the light shielding plate 232 is adjusted through the electrostriction device 231 to achieve the purpose of controlling the illumination area, so as to solve the problem of the overexposure of the crossing vehicle.
It should be noted that, since three vehicles are shown in fig. 5, two vehicles on the right side are the vehicles for crossing with one vehicle on the left side, that is, two vehicles for crossing are shown in fig. 5, and the two vehicles for crossing are different in distance from one vehicle on the left side and different in relative angle, in order to distinguish between the vehicles in fig. 5 to 7, the parameters of the two vehicles for crossing are distinguished by using the superscript "in order to distinguish between the vehicles.
In general, the center distance b between standard adjacent lanes of an urban road is 3.5m, and the luminous power of a single infrared light source is 9W. For distances above 30m, the infrared light source is regarded as a point light source, and the central light radiation intensity I can be obtained0When the photodetector receiving aperture a is 5mm, 94.33w/sr, the formula (4) is usedThe results shown in table 1 below were obtained by calculation.
| φ(uw) | α(°) | b(mm) | a(mm) | d(m) |
| 58 | 2.003317 | 3500 | 5 | 100.1016 |
| 65 | 2.120921 | 3500 | 5 | 94.55103 |
| 80 | 2.353322 | 3500 | 5 | 85.21367 |
| 100 | 2.631649 | 3500 | 5 | 76.20135 |
| 150 | 3.2248 | 3500 | 5 | 62.18532 |
| 200 | 3.725646 | 3500 | 5 | 53.82563 |
| 350 | 4.9364 | 3500 | 5 | 40.62378 |
TABLE 1 measurement results under the respective measurement conditions
As can be seen from table 1, the light receiving fluxes of the photodetectors are different depending on the vehicle distance d, and the corresponding deflection angle of the vehicle with respect to the host vehicle can be calculated by the formula (4), and the result is shown in table 1. The displacement of the shading plate is controlled according to the corresponding relation of the formula (4) and the displacement of the electrostriction device, so that the regional illumination is adjusted to avoid the problem of overexposure during meeting.
Because the imaging module of the night vision system has a certain dynamic range, namely, the imaging module can only clearly image objects with maximum brightness and objects with minimum brightness in a certain range, and only needs to control the luminous flux of the illumination light within a certain threshold value range phiminAnd (4) the following steps. The displacement of the light shielding plate is X, the photoelectric conversion coefficient of the detector is K1, the conversion coefficient of the current-voltage converter is K2, and the expansion coefficient of the electrostriction device is K3.
The shutter plate displacement amount X is K1K 2K 3 phi.
For selected systems, in generalThe photoelectric conversion coefficient K1 and the electrostriction coefficient K3 are deterministic parameters, so that the light shielding plate displacement X can be directionally adjusted only by adjusting the conversion coefficient K2 of the current-voltage converter. Setting the initial position of the light shield plate as X0And X0＝K1*K2*K3*φmin. When phi is>φminIs set to phi ═ phiminAnd + Δ Φ, coefficients K1, K2, and K3 are obtained by specific optical detectors, electrostrictive devices, and circuit control, and the amount of displacement of the mask is determined as Δ X — K1 × K2 × K3 × Δ Φ.
Night vision systems are primarily aimed at increasing the night-time range of vision, typically in areas where the range is outside 30-40m, and where driving attention is given to adjacent lanes. According to the anti-overexposure device provided by the embodiment of the invention, the detection circuit is used for detecting the illumination light of the preset wave band emitted by the rendezvous vehicle in the adjacent lane to obtain the light signal, and then the control circuit controls the adjusting component to adjust the illumination area of the light source according to the light signal detected by the detection circuit, so that the adjusting component adjusts the illumination area of the light source under the control of the control circuit, and the interference of the light source on the night vision system of the rendezvous vehicle is reduced. The embodiment of the invention achieves the purpose of preventing overexposure by adjusting the illumination area of the light source, thereby being applicable to various types of light sources, solving the problem of overexposure of night vision images caused by interaction between vehicles with an active night vision system in the prior art, and having high light source utilization rate, low cost and wide applicability.
Meanwhile, as an additional processor is not needed for image recognition to control the illumination area, the system operation load is reduced. In the embodiment, the adjustment of the illumination area is controlled by all hardware, so that the reliability is improved, and the night vision system is small in size, low in cost and convenient to integrate in a night vision system.
In order to implement the above embodiment, the present invention also provides a vehicle having the night vision system described above.
The vehicle comprises a night vision system with an anti-overexposure device, wherein the anti-overexposure device utilizes a detection circuit to detect illumination light of a preset waveband emitted by a rendezvous vehicle to obtain an optical signal, and then a control circuit controls an adjusting assembly to adjust an illumination area of a light source according to the optical signal detected by the detection circuit, so that the adjusting assembly adjusts the illumination area of the light source under the control of the control circuit to reduce the interference of the light source on the night vision system of the rendezvous vehicle. The embodiment of the invention achieves the purpose of preventing overexposure by adjusting the illumination area of the light source, thereby being applicable to various types of light sources, solving the problem of overexposure of night vision images caused by interaction between vehicles with an active night vision system in the prior art, and having high light source utilization rate, low cost and wide applicability.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (11)
1. A night vision system for imaging an object by illumination with an infrared light source, comprising:
the light source and an anti-overexposure device used for controlling an illumination area of the light source;
the anti-overexposure device comprises a detection circuit, a control circuit and an adjusting component;
wherein the detection circuit comprises: the optical filter is arranged on the light incident surface of the detector;
the optical filter is used for filtering the illuminating light emitted by the intersection vehicle so as to transmit the illuminating light with a preset waveband;
the detector is used for measuring optical parameters of the illumination light transmitted by the optical filter to obtain an optical signal in a voltage value form;
the optical parameter is a frequency domain position; the detection circuit further comprises an f-theta lens;
the f-theta lens is arranged between the optical filter and the detection array of the detector, and the f-theta lens, the optical filter and the detection array share an optical axis; the control circuit is electrically connected with the detection circuit and used for controlling the adjusting component to adjust the illumination area of the light source according to the optical signal detected by the detection circuit;
the adjusting component is electrically connected with the control circuit and used for changing the optical axis or the light emitting angle of the light source under the control of the control circuit so as to adjust the illumination area of the light source.
2. The night vision system of claim 1, wherein the control circuit comprises: a current-to-voltage converter;
and the current-voltage converter is electrically connected with the detection circuit and used for outputting photocurrent in accordance with a corresponding current value according to the voltage value of the optical signal in the voltage form.
3. Night vision system according to claim 2,
the current-voltage converter is specifically configured to output a photocurrent with a current value meeting a second threshold value when the voltage value of the optical signal in the voltage form is higher than the first threshold value, so as to adjust the illumination area by using the photocurrent control adjustment component.
4. The night vision system of claim 2, wherein the adjustment assembly comprises: electrostrictives and visors;
the electrostrictive device is electrically connected with the current-voltage converter and is used for extending or shortening according to the current value of the photocurrent under the control of the photocurrent so as to drive the shading plate to translate;
the light shielding plate is positioned in the light emitting direction of the light source, is fixedly connected with the electrostriction device, and is used for shielding part of light rays emitted by the light source under the driving of the electrostriction device so as to adjust the illumination area of the light source.
5. The night vision system of claim 2, wherein the adjustment assembly comprises: an electrostrictive and a light source base; the light source base is rotatably connected with the electrostriction device, and the light source is arranged on the light source base;
the electrostrictive device is electrically connected with the current-voltage converter and is used for extending or shortening according to the current value of the photocurrent under the control of the photocurrent so as to drive the light source base to rotate;
the light source base is driven by the electrostriction device to rotate, and the illumination angle of the light source is changed, so that the illumination area of the light source is adjusted.
6. An anti-overexposure device, comprising: the device comprises a detection circuit, a control circuit and an adjusting component;
wherein the detection circuit comprises: the optical filter is arranged on the light incident surface of the detector;
the optical filter is used for filtering the illuminating light emitted by the intersection vehicle so as to transmit the illuminating light with a preset waveband;
the detector is used for measuring optical parameters of the illumination light transmitted by the optical filter to obtain an optical signal in a voltage value form;
the optical parameter is a frequency domain position; the detection circuit further comprises an f-theta lens;
the f-theta lens is arranged between the optical filter and the detection array of the detector, and the f-theta lens, the optical filter and the detection array share an optical axis;
the control circuit is electrically connected with the detection circuit and used for controlling the adjusting component to adjust the illumination area of the light source according to the optical signal detected by the detection circuit;
the adjusting component is electrically connected with the control circuit and used for changing the optical axis or the light emitting angle of the light source under the control of the control circuit so as to adjust the illumination area of the light source.
7. The overexposure prevention device of claim 6, wherein the control circuit comprises: a current-to-voltage converter;
and the current-voltage converter is electrically connected with the detection circuit and used for outputting photocurrent in accordance with a corresponding current value according to the voltage value of the optical signal in the voltage form.
8. The anti-overexposure device of claim 7, wherein the voltage converter is configured to output the photocurrent having a current value corresponding to a second threshold value when the voltage value of the optical signal in the form of voltage is higher than a first threshold value.
9. The anti-overexposure device of claim 7, wherein the adjustment assembly comprises: electrostrictives and visors;
the electrostrictive device is electrically connected with the current-voltage converter and is used for extending or shortening according to the current value of the photocurrent under the control of the photocurrent so as to drive the shading plate to translate;
the light shielding plate is positioned in the light emitting direction of the light source, is fixedly connected with the electrostriction device, and is used for shielding part of light rays emitted by the light source under the driving of the electrostriction device so as to adjust the illumination area of the light source.
10. The anti-overexposure device of claim 7, wherein the adjustment assembly comprises: an electrostrictive and a light source base; the light source base is rotatably connected with the electrostriction device, and the light source is arranged on the light source base;
the electrostrictive device is electrically connected with the current-voltage converter and is used for extending or shortening according to the current value of the photocurrent under the control of the photocurrent so as to drive the light source base to rotate;
the light source base is driven by the electrostriction device to rotate, and the illumination angle of the light source is changed, so that the illumination area of the light source is adjusted.
11. A vehicle, characterized in that it comprises a night vision system as claimed in any one of claims 1 to 5.
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| CN201611105635.3A CN108156352B (en) | 2016-12-05 | 2016-12-05 | Anti-overexposure device, night vision system and vehicle |
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| CN201611105635.3A CN108156352B (en) | 2016-12-05 | 2016-12-05 | Anti-overexposure device, night vision system and vehicle |
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| CN108156352A CN108156352A (en) | 2018-06-12 |
| CN108156352B true CN108156352B (en) | 2020-02-21 |
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| CN209926252U (en) * | 2019-02-26 | 2020-01-10 | 华域视觉科技(上海)有限公司 | Car lamp module for detection lighting and detection lighting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105253058A (en) * | 2015-10-08 | 2016-01-20 | 江苏新安电器有限公司 | Car light control system and method |
| CN205490822U (en) * | 2016-01-06 | 2016-08-17 | 深圳市智安物联科技有限公司 | Infrared HD IP camera |
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| TWI573494B (en) * | 2014-04-15 | 2017-03-01 | 索玉昇 | Illuminance based illumination regulating system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105253058A (en) * | 2015-10-08 | 2016-01-20 | 江苏新安电器有限公司 | Car light control system and method |
| CN205490822U (en) * | 2016-01-06 | 2016-08-17 | 深圳市智安物联科技有限公司 | Infrared HD IP camera |
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