CN204559722U - A kind of mining high definition video collecting system - Google Patents
A kind of mining high definition video collecting system Download PDFInfo
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- CN204559722U CN204559722U CN201520265549.3U CN201520265549U CN204559722U CN 204559722 U CN204559722 U CN 204559722U CN 201520265549 U CN201520265549 U CN 201520265549U CN 204559722 U CN204559722 U CN 204559722U
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Abstract
The utility model discloses a kind of mining high definition video collecting system, comprising: video acquisition unit; Secondary light source and intrinsic safety electric source; Secondary light source, for when outside low-light (level), for video acquisition unit provides supplementary light source; Intrinsic safety electric source, is all connected with video acquisition unit and secondary light source, and for providing electric energy for video acquisition unit, and for starting secondary light source in illumination lower than during set point, and provide electric energy for it; Video acquisition unit, comprising: optical lens, and is connected the MCCD imageing sensor of setting, digital signal processor and video frequency output successively with optical lens.The utility model Whole Equipment is low in energy consumption, lightweight, volume is little, cost is low, easy maintenance, can realize the high definition video collecting under total darkness environment, and meets essential safety principle.
Description
Technical field
The utility model belongs to video capture technology field, relates to a kind of mining high definition video collecting system.
Background technology
In recent years in the darker place of the environment such as mine because video monitoring is not in place, some faults are made to fail found timely and lead to a disaster, use mining low-light (level) video capture device can obtain the high clear video image of low-light (level) even under total darkness environment, be convenient to Timeliness coverage accident potential point.
Existing mining video capture device volume is large and heavy, the scheme of existing use is ccd image sensor associated matrix column infrared LED floor light, usually to increase infrared quantity to obtain video image more clearly, power consumption is strengthened and not easily later maintenance, and price also costly in addition.
Utility model content
The purpose of this utility model is to provide a kind of mining high definition video collecting system, to solve low-light (level) at some mines even under total darkness environment, the situation that the video quality collected is not high.
The technical scheme that the utility model adopts is, a kind of mining high definition video collecting system, comprising: video acquisition unit; Secondary light source and intrinsic safety electric source;
Secondary light source, for when outside low-light (level), for video acquisition unit provides supplementary light source;
Intrinsic safety electric source, is all connected with video acquisition unit and secondary light source, and for providing electric energy for video acquisition unit, and for starting secondary light source in illumination lower than during set point, and provide electric energy for it;
Video acquisition unit, comprising: optical lens, and is connected the MCCD imageing sensor of setting, digital signal processor and video frequency output successively with optical lens;
Wherein, optical lens, for obtaining external environment condition image information, and is sent to MCCD imageing sensor by image information; MCCD imageing sensor, for receiving the image information that optical lens sends, and after converting image information to electric image signal, is sent to digital signal processor; Digital signal processor, for receiving the electric image signal that MCCD imageing sensor sends, and is converted thereof into the composite video signal of simulation, and is exported by video frequency output.
Further, secondary light source is infrared laser pipe.
Further, the wavelength of the laser of infrared laser pipe transmitting is 940nm.
Further, the Laser emission end of infrared laser pipe is provided with the concavees lens for even spread laser light source.
Further, the light transmittance of concavees lens is 95%.
Further, intrinsic safety electric source comprises for starting secondary light source and providing the drive circuit of constant-current source for it, drive circuit comprises synchronous buck-voltage increase and current constant chip XZ3442, chip XZ3442 connects input voltage both positive and negative polarity by first interface socket, chip XZ3442 is all connected with photo resistance by the second interface socket and the 4th interface socket, and chip XZ3442 connects secondary light source by the 3rd interface socket;
Two photo resistance, for accessing the variable resistor of drive circuit, one of them photo resistance is for controlling connection and the disconnection of secondary light source, and another photo resistance is for controlling the brightness of secondary light source.
Further, drive circuit is specially: comprise synchronous buck-voltage increase and current constant chip XZ3442, first pin of XZ3442 is through the second capacity earth, chip XZ3442 second pin is connected with three-prong through the second inductance, chip XZ3442 the 4th pin ground connection, chip XZ3442 the 5th pin one tunnel connects the 4th capacitance cathode, another road connects the second pin of the 3rd interface socket, 4th electric capacity minus earth, chip XZ3442 the 6th pin one tunnel connects the first pin of first interface socket, another road connects the first pin of the second interface socket, second pin ground connection of first interface socket, chip XZ3442 the 7th pin one tunnel connects the first pin of the second interface socket through the 4th resistance, another road connects the three-prong of the first triode, chip XZ3442 the 7th pin also has a road through the first capacity earth, another road of the first pin of second interface socket is through the 3rd capacity earth, second pin ground connection of the first triode, first pin connects the second pin of the second interface socket through the 3rd resistance, another road of the second pin of second interface socket is through the first grounding through resistance, chip XZ3442 the 8th pin one tunnel connects the first pin of the 3rd interface socket, another road connects the first pin of the 4th interface socket, second pin of the 4th interface socket connects the positive pole of the 4th electric capacity, chip XZ3442 the 8th pin also has a road through the second grounding through resistance.
Further, intrinsic safety electric source also comprises for video acquisition unit provides the control circuit of power supply, control circuit comprises DC/DC step-down controller MP2359, 5th pin one tunnel of DC/DC step-down controller MP2359 connects positive 12V power supply, another road is through the one or eight capacity earth, DC/DC step-down controller MP2359 the 4th pin connect positive 12V power supply through the 7th resistance, the second pin ground connection of DC/DC step-down controller MP2359, first pin one tunnel of DC/DC step-down controller MP2359 connects positive 5V power supply through the 3rd diode, another road connects the 6th pin through the one or seven electric capacity, 6th pin one tunnel of DC/DC step-down controller MP2359 is through the 4th voltage stabilizing didoe ground connection, another road connects the 3rd inductance, the other end one tunnel of the 3rd inductance is through the one or nine capacity earth, another road connects positive 5V power supply, three-prong one tunnel of DC/DC step-down controller MP2359 is through the 9th grounding through resistance, another road connects positive 5V power supply through the 8th resistance.
Further, the input of intrinsic safety electric source adopts lithium iron phosphate storage battery.
The beneficial effects of the utility model are, adopt MCCD transducer in conjunction with the scheme of infrared laser pipe as secondary light source, MCCD has higher visible ray and infrared sensitivity, signal to noise ratio under low-light (level) is also comparatively excellent, be equipped with laser infrared pipe during use, the high clear video image of low-light (level) even under total darkness environment can be obtained, and meet essential safety principle, Whole Equipment is low in energy consumption, lightweight, volume is little, cost is low, easy maintenance.
Accompanying drawing explanation
Fig. 1 is the model calling figure of a kind of mining high definition video collecting system of the utility model;
Fig. 2 is the schematic diagram of the drive circuit of a kind of mining high definition video collecting system of the utility model;
Fig. 3 is the power supply circuits schematic diagram of a kind of mining high definition video collecting system of the utility model.
In figure, 1. video acquisition unit, 2. secondary light source, 3. intrinsic safety electric source, 4. optical lens, 5.MCCD imageing sensor, 6. digital signal processor, 7. video frequency output.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
The utility model provides a kind of mining high definition video collecting system, as shown in Figure 1, comprising: video acquisition unit 1; For providing the secondary light source 2 of supplementary light source when outside low-light (level); And be all connected with video acquisition unit 1 and secondary light source 2, and provide the intrinsic safety electric source 3 of electric energy for it, this intrinsic safety electric source 3 also in illumination lower than starting secondary light source 2 during set point and providing electric energy for it.
As shown in Figure 1, video acquisition unit 1, comprising: optical lens 4, and is connected the MCCD imageing sensor 5 of setting, digital signal processor 6 and video frequency output 7 successively with optical lens 4;
Optical lens 4, for obtaining external environment condition image information, and is sent to MCCD imageing sensor 5 by image information; MCCD imageing sensor 5, for receiving the image information that optical lens 4 sends, and after converting image information to electric image signal, is sent to digital signal processor 6; Digital signal processor 6, for receiving the electric image signal that MCCD imageing sensor 5 sends, and is converted thereof into the composite video signal of simulation, and is exported by video frequency output 7.
Video acquisition unit 1 completes collection and the output of video, secondary light source unit 2 for video acquisition unit be operated in low-light (level) even total darkness environment time floor light is provided, intrinsic safety electric source unit 3 provides power supply supply for whole equipment, equips global design and meets essential safety principle.
Video acquisition unit 1 mainly comprises optical lens 4, the MCCD imageing sensor 5 of 1/2 inch and DSP 6, the imageing sensor that video acquisition unit 1 adopts is MCCD imageing sensor, the high clear video image far reached outside 30m under total darkness environment can be collected, secondary light source is the laser infrared floor light of 940nm, the vision signal exported is simulation composite video signal, adopt 1/2 inch of MCCD imageing sensor that high sensitivity is photosensitive, two filter day and night automatically switches, automatically infrared laser secondary light source is opened under low-light (level), so that the HD video under acquisition low-light (level).
Secondary light source 2 is can regulate the infrared laser pipe of brightness and correspondence is provided with for diffused light source, the concavees lens of uniform irradiation environment, enable secondary light source uniform irradiation environment, during irradiation picture scope wide, evenly and without speck, thus better obtain the HD video under low-light (level).Secondary light source 2 is the infrared laser pipe of 940nm, and infrared laser pipe is SMD infrared laser pipe, is convenient to welded and installed on aluminium base, installs concavees lens in order to diffused light source in the outside of infrared laser pipe.Enable secondary light source uniform irradiation environment, during irradiation picture scope wide, evenly and without speck, thus better obtain the HD video under low-light (level).Automatically switch to operating state when reaching low light environment, secondary light source 2 is opened, and according to the difference of illumination, the drive circuit of infrared laser pipe provides the electric current of different size, thus regulates the bright dark degree of infrared laser pipe.
Intrinsic safety electric source 3 input adopts lithium iron phosphate storage battery.Intrinsic safety electric source unit 3 is powered by lithium iron phosphate storage battery, provides 12V direct voltage, is designed power to whole equipment by efficient DC-DC circuit, and the driving power of its mid-infrared laser pipe is constant-current source, and whole circuit design meets essential safety principle.
As shown in Figure 2, intrinsic safety electric source 3 also comprises for secondary light source 2 provides the drive circuit of adjustable constant-current source, it is simple that drive circuit has circuit structure, peripheral circuit is simple, adopts two photo resistance, the illumination of infrared laser pipe can be made to arrive and better regulate, make video image quality higher, and input voltage is little, power consumption is few, and can be embodied as infrared laser pipe provides constant-current source.
Drive circuit specifically comprises synchronous buck-voltage increase and current constant chip XZ3442, chip XZ3442 first pin is through the second electric capacity C2 ground connection, chip XZ3442 second pin is connected with three-prong through the second inductance L 2, chip XZ3442 the 4th pin ground connection, chip XZ3442 the 5th pin one tunnel connects the 4th electric capacity C4 positive pole, another road connects second pin of the 3rd interface socket J3, 4th electric capacity C4 minus earth, chip XZ3442 the 6th pin one tunnel connects first pin of first interface socket J1, another road connects first pin of the second interface socket J2, the second pin ground connection of first interface socket J1, chip XZ3442 the 7th pin one tunnel connects first pin of the second interface socket J2 through the 4th resistance R4, another road connects the three-prong of the first triode Q1, chip XZ3442 the 7th pin also has a road through the first electric capacity C1 ground connection, another road of the first pin of second interface socket J2 is through the 3rd electric capacity C3 ground connection, the second pin ground connection of the first triode Q1, first pin connects second pin of the second interface socket J2 through the 3rd resistance R3, another road of the second pin of second interface socket J2 is through the first resistance R1 ground connection, chip XZ3442 the 8th pin one tunnel connects first pin of the 3rd interface socket J3, another road connects first pin of the 4th interface socket J4, second pin of the 4th interface socket J4 connects the positive pole of the 4th electric capacity C4, chip XZ3442 the 8th pin also has a road through the second resistance R2 ground connection.
Power supply control chip is XZ3442, infrared laser pipe is welded on the excellent aluminium base of heat sinking function, controlled the bright dark degree of illumination of infrared laser pipe by the difference of external environment condition illumination, and load onto concavees lens in the outside of infrared laser pipe, thus reach best floor light effect.
Wherein, chip XZ3442 connects input voltage both positive and negative polarity by first interface socket J1, and chip XZ3442 is all connected with photo resistance by the second interface socket J2 and the 4th interface socket J4, and chip XZ3442 connects secondary light source 2 by the 3rd interface socket J3.
In this drive circuit, two photo resistance are the variable resistor of access drive circuit, along with illumination reduces, the photo resistance resistance that second interface socket J2 connects reduces, in the bleeder circuit be made up of the second interface socket J2 and the first resistance R1, the first resistance R1 terminal voltage value reaches the turn-on voltage of the first triode Q1, the first triode Q1 conducting, chip the 7th pin is low, and chip XZ3442 works.The 5th pin output voltage values of chip XZ3442.Infrared laser pipe is connect and the 4th interface socket photo resistance that J4 connects forms shunt circuit jointly by the 3rd interface socket J3.Two photo resistance is adopted to control, wherein a road the 3rd interface socket J3 connects infrared laser spot plate, for controlling opening and shutting off of infrared laser pipe, 4th interface socket J4 connects another road photo resistance and shunts, for controlling the bright dark degree of infrared laser pipe, make video capture image image quality better.
When illumination illumination is greater than set point, it is larger that second interface socket J2 connects photo resistance resistance, by the second interface socket J2 and the first resistance R1 form bleeder circuit in, first resistance R1 terminal voltage value not yet reaches the turn-on voltage of the first triode Q1, first triode Q1 ends, now chip XZ3442 the 7th pin is high level, and chip XZ3442 does not work.
As shown in Figure 3, intrinsic safety electric source 3 comprises for video acquisition unit 1 provides the control circuit of 5V power supply, specifically comprise DC/DC step-down controller MP2359, 5th pin one tunnel of DC/DC step-down controller MP2359 connects positive 12V power supply, another road is through the one or eight electric capacity C18 ground connection, DC/DC step-down controller MP2359 the 4th pin connect positive 12V power supply through the 7th resistance R7, the second pin ground connection of DC/DC step-down controller MP2359, first pin one tunnel of DC/DC step-down controller MP2359 connects positive 5V power supply through the 3rd diode D3, another road connects the 6th pin through the one or seven electric capacity C17, 6th pin one tunnel of DC/DC step-down controller MP2359 is through the 4th voltage stabilizing didoe D4 ground connection, another road connects the 3rd inductance L 3, the other end one tunnel of the 3rd inductance L 3 is through the one or nine electric capacity C19 ground connection, another road connects positive 5V power supply, three-prong one tunnel of DC/DC step-down controller MP2359 is through the 9th resistance R9 ground connection, another road connects positive 5V power supply through the 8th resistance R8.Employing lithium iron phosphate storage battery is power supply, voltage is DC12V, convert the 12V of input to 5V by the BUCK converter MP2359 of a current-mode control and provide power supply to video acquisition unit 1, adopt efficient LDO circuit, circuit design meets essential safety principle.
Operation principle of the present utility model is, low-light (level) even total darkness environment time, open secondary light source 2, the i.e. drive circuit works of infrared laser pipe, infrared laser pipe is opened automatically, under the floor light of infrared laser pipe, video acquisition when completing low-light (level) by optical lens 4 and MCCD imageing sensor 5, obtain the data image signal after quantizing, then obtain simulating composite video signal by DSP 6 process, whole equipment is always powered and to be powered by lithium iron phosphate storage battery, and whole circuit design meets essential safety principle.Whole system adopts MCCD in conjunction with the scheme of infrared laser pipe, and MCCD imageing sensor 5 has the visible ray of superelevation and the image sensor chip of infrared sensitivity, and the light source that infrared laser pipe sends is without red sudden and violent phenomenon, low in energy consumption, is convenient to safeguard.
Native system has the following advantages:
1, the mode adopting MCCD imageing sensor and infrared laser duct ligation to close, can get the video image of high definition under the mine under low-light (level) and total darkness environment.The infrared sensitivity of MCCD imageing sensor is maximum can reach 940nm, makes the image that obtains more clear and without red phenomenon of exposing to the sun.
2, concavees lens are arranged on the laser injection end of infrared laser pipe, the reverberation of infrared laser pipe can be made to return by non-uniform reflection, make the video face of camera collection wider, video image is more clear, and wherein, swashing light-struck dispersion angle after using concavees lens is 60 degree, the light transmittance of concavees lens is 95%, material is optical grade PMMA, and diameter is 10mm, is highly 11mm.
3, adopt constant-current source as the driving power of infrared laser pipe, significantly effectively can increase the life cycle of infrared laser pipe, size of current is 300 ~ 700mA adjustable current, two photo resistance is adopted to control, wherein a road controls opening and shutting off of infrared laser pipe, another road controls the bright dark degree of infrared laser pipe, makes video capture image image quality better.Infrared laser pipe is welded on aluminium base, can efficiently radiates heat, thus ensure the useful life of infrared laser pipe.
4, single unit system meets essential safety principle, reliably can use in mine low-light (level).
High definition video collecting system that one of the present utility model is mining, the high definition video collecting under total darkness environment can be realized, and meet essential safety principle, Whole Equipment is low in energy consumption, lightweight, volume is little, cost is low, easy maintenance, secondary light source 2 is the laser infrared pipe of 940nm, without red sudden and violent phenomenon, the secondary light source adopted drives as constant-current source drives, operating voltage is low, be easy to this Anhua, secondary light source drive circuit is novel, two photo resistance controls, one tunnel controls day and night to switch, one tunnel controls size of current, power consumption is reduced and clear picture, be convenient to promote the use of under some low-light (level) environment such as mine.
Claims (9)
1. a mining high definition video collecting system, is characterized in that, comprising: video acquisition unit (1); Secondary light source (2) and intrinsic safety electric source (3);
Described secondary light source (2), for when outside low-light (level), for video acquisition unit (1) provides supplementary light source;
Described intrinsic safety electric source (3), all be connected with video acquisition unit (1) and secondary light source (2), and for providing electric energy for video acquisition unit (1), and for starting secondary light source (2) in illumination lower than during set point, and provide electric energy for it;
Described video acquisition unit (1), comprise: optical lens (4), and be connected the MCCD imageing sensor (5) of setting, digital signal processor (6) and video frequency output (7) successively with described optical lens (4);
Wherein, described optical lens (4), for obtaining external environment condition image information, and is sent to MCCD imageing sensor (5) by described image information; Described MCCD imageing sensor (5), for receiving the described image information that optical lens (4) sends, and after converting described image information to electric image signal, is sent to described digital signal processor (6); Described digital signal processor (6), for receiving the electric image signal that described MCCD imageing sensor (5) sends, and converts thereof into the composite video signal of simulation, and is exported by video frequency output (7).
2. a kind of mining high definition video collecting system as claimed in claim 1, is characterized in that, described secondary light source (2) is infrared laser pipe.
3. a kind of mining high definition video collecting system as claimed in claim 2, is characterized in that, the wavelength of the laser that described infrared laser pipe is launched is 940nm.
4. a kind of mining high definition video collecting system as claimed in claim 2 or claim 3, is characterized in that, the Laser emission end of described infrared laser pipe is provided with the concavees lens for evenly spreading described LASER Light Source.
5. a kind of mining high definition video collecting system as claimed in claim 4, is characterized in that, the light transmittance of described concavees lens is 95%.
6. a kind of mining high definition video collecting system as claimed in claim 1 or 2, it is characterized in that, described intrinsic safety electric source (3) comprises for starting secondary light source (2) and providing the drive circuit of constant-current source for it, described drive circuit comprises synchronous buck-voltage increase and current constant chip XZ3442, described chip XZ3442 connects input voltage both positive and negative polarity by first interface socket (J1), described chip XZ3442 is all connected with photo resistance by the second interface socket (J2) and the 4th interface socket (J4), described chip XZ3442 connects secondary light source (2) by the 3rd interface socket (J3),
Described two photo resistance, for accessing the variable resistor of drive circuit, one of them photo resistance is for controlling connection and the disconnection of described secondary light source (2), and another photo resistance is for controlling the brightness of described secondary light source (2).
7. a kind of mining high definition video collecting system as claimed in claim 6, it is characterized in that, described drive circuit is specially: comprise synchronous buck-voltage increase and current constant chip XZ3442, first pin of described chip XZ3442 is through the second electric capacity (C2) ground connection, described chip XZ3442 second pin is connected with three-prong through the second inductance (L2), described chip XZ3442 the 4th pin ground connection, described chip XZ3442 the 5th pin one tunnel connects the 4th electric capacity (C4) positive pole, another road connects the second pin of the 3rd interface socket (J3), described 4th electric capacity (C4) minus earth, described chip XZ3442 the 6th pin one tunnel connects the first pin of first interface socket (J1), another road connects the first pin of the second interface socket (J2), second pin ground connection of described first interface socket (J1), described chip XZ3442 the 7th pin one tunnel connects the first pin of the second interface socket (J2) through the 4th resistance (R4), another road connects the three-prong of the first triode (Q1), described chip XZ3442 the 7th pin also has a road through the first electric capacity (C1) ground connection, another road of the first pin of described second interface socket (J2) is through the 3rd electric capacity (C3) ground connection, second pin ground connection of described first triode (Q1), first pin connects the second pin of the second interface socket (J2) through the 3rd resistance (R3), another road of the second pin of described second interface socket (J2) is through the first resistance (R1) ground connection, described chip XZ3442 the 8th pin one tunnel connects the first pin of the 3rd interface socket (J3), another road connects the first pin of the 4th interface socket (J4), second pin of described 4th interface socket (J4) connects the positive pole of the 4th electric capacity (C4), described chip XZ3442 the 8th pin also has a road through the second resistance (R2) ground connection.
8. a kind of mining high definition video collecting system as claimed in claim 1 or 2, it is characterized in that, described intrinsic safety electric source (3) also comprises for video acquisition unit (1) provides the control circuit of power supply, described control circuit comprises DC/DC step-down controller MP2359, 5th pin one tunnel of described DC/DC step-down controller MP2359 connects positive 12V power supply, another road is through the one or eight electric capacity (C18) ground connection, described DC/DC step-down controller MP2359 the 4th pin connect positive 12V power supply through the 7th resistance (R7), the second pin ground connection of described DC/DC step-down controller MP2359, first pin one tunnel of described DC/DC step-down controller MP2359 connects positive 5V power supply through the 3rd diode (D3), another road connects the 6th pin through the one or seven electric capacity (C17), 6th pin one tunnel of described DC/DC step-down controller MP2359 is through the 4th voltage stabilizing didoe (D4) ground connection, another road connects the 3rd inductance (L3), the other end one tunnel of described 3rd inductance (L3) is through the one or nine electric capacity (C19) ground connection, another road connects positive 5V power supply, three-prong one tunnel of described DC/DC step-down controller MP2359 is through the 9th resistance (R9) ground connection, another road connects positive 5V power supply through the 8th resistance (R8).
9. a kind of mining high definition video collecting system as claimed in claim 1 or 2, is characterized in that, the input of described intrinsic safety electric source (3) adopts lithium iron phosphate storage battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520265549.3U CN204559722U (en) | 2015-04-28 | 2015-04-28 | A kind of mining high definition video collecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520265549.3U CN204559722U (en) | 2015-04-28 | 2015-04-28 | A kind of mining high definition video collecting system |
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| CN204559722U true CN204559722U (en) | 2015-08-12 |
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| CN201520265549.3U Withdrawn - After Issue CN204559722U (en) | 2015-04-28 | 2015-04-28 | A kind of mining high definition video collecting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767924A (en) * | 2015-04-28 | 2015-07-08 | 西安科技大学 | Mining high-definition video collecting system and method |
| CN105721785A (en) * | 2016-03-23 | 2016-06-29 | 浙江大学 | Camera-shooting-preventing interference equipment |
| CN106657890A (en) * | 2016-11-03 | 2017-05-10 | 西安科技大学 | Laser concealed light source video acquisition light supplement system and application method thereof |
-
2015
- 2015-04-28 CN CN201520265549.3U patent/CN204559722U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767924A (en) * | 2015-04-28 | 2015-07-08 | 西安科技大学 | Mining high-definition video collecting system and method |
| CN105721785A (en) * | 2016-03-23 | 2016-06-29 | 浙江大学 | Camera-shooting-preventing interference equipment |
| CN106657890A (en) * | 2016-11-03 | 2017-05-10 | 西安科技大学 | Laser concealed light source video acquisition light supplement system and application method thereof |
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Granted publication date: 20150812 Effective date of abandoning: 20180330 |