CN101608950B - Luminance detector of universal CCD camera - Google Patents
Luminance detector of universal CCD camera Download PDFInfo
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- CN101608950B CN101608950B CN2009100233890A CN200910023389A CN101608950B CN 101608950 B CN101608950 B CN 101608950B CN 2009100233890 A CN2009100233890 A CN 2009100233890A CN 200910023389 A CN200910023389 A CN 200910023389A CN 101608950 B CN101608950 B CN 101608950B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention discloses a luminance detector of a universal CCD camera, which comprises a light source assembly, a luminance sensor, an electronic control box and a computer, wherein the light source assembly comprises a paraboloid reflecting mirror and a tungsten-halogen bulb; the electronic control box comprises a luminance detecting circuit and a microprogrammed control unit (MCU); the computer sends target luminance and a drive command to the MCU by a communication port; an optical signal of the light source assembly is converted into an electric signal to be sent to the MCU by the luminance sensor; and the MCU controls a working tap position of the luminance detecting circuit after the current luminance converted by the signal is compared with a luminance threshold value, adjusts thedrive voltage of the light source assembly after the current luminance is compared with the target luminance, and finally leads the output light of the light source assembly to meet the requirements of the target surface luminance of a detected CCD camera. The invention realizes a large measurement range of 0.1 lx-10<6> lx and has the characteristics of even and stable illumination, reliable detection result, convenient use, wide application range, and the like.
Description
Technical field
The invention belongs to the photoelectric instrument detection range, relate generally to the instrument that can detect the ccd video camera performance, relate in particular to a kind of luminance detector of universal CCD camera.
Background technology
In recent years, visual intelligence technology plays important effect in military field, battlefield commander, campaign project staff and combatant all need in time to obtain relevant battlefield dynamically, the strategy in enemy region of war and the full depth and the relevant image information of important tactical goal.Digital battlefield and combined guidance, the more too busy to get away visual information of precision strike.Therefore, video information collector such as ccd video camera just becomes the indispensability equipment of sea, land and sky electro-optical system.It is widely used in scouting, fields such as sight is taken aim at, photoelectronic warfare, firepower control, precise guidance, public security, space flight, aviation, industrial or agricultural.The common feature of these application is that light has certain requirement to the illumination on the video camera target surface, but according to the difference in camera application field, needs the brightness value that satisfies also different, should strict control with measure.
From the research situation of present understanding as can be known, military ccd video camera illumination testing apparatus roughly can adopt following three kinds of schemes to realize the measurement of illumination:
First kind is the approximate proving installation of making the illumination light source of headlight.By test and greatest drawback that use to find this proving installation is that brightness, distance, the angle of headlight is wayward, the position of illuminometer, direction are also wayward, the measuring error that can influence illumination greatly that departs from of CCD television camera entrance pupil and big lamp wiring, so measurement data instability, also inaccurate, can only obtain approximation.In addition because the brightness of headlight is too strong, operating process to ocular damage big and light intensity also can't control automatically.
Automatic Light control system integrating sphere type illumination testing apparatus is not with in second kind of employing.In order to guarantee uniformity of luminance and the illumination that reaches maximum 100,000 lx, on integrating sphere, place the Halogen lamp LED of ten different brightness
On the installation convex of cup; Described swivel nut is threaded with the installation convex of described Lamp cup.
According to the present invention, described lamp pearl is selected the halogen tungsten lamp pearl for use; Described page module also is provided with " turning off the light " button, when described transport module receives " turning off the light " button command of described computing machine transmission, it is zero instruction that described voltage control module is sent voltage to transport module, and the magnitude of voltage that output module is sent D/A converter into described power amplifier directly reduces to zero.
Beneficial effect of the present invention is embodied in the following aspects.
(1) light source assembly adopts parabolic reflector and place the scheme of the continuous dimmable lamp pearl of luminous intensity on the reflective mirror focus, the parallel beam of this light source assembly output can make the illumination on the ccd video camera target surface reach the scope of 0.1～100000lx, thereby lays a good foundation for the present invention realizes wide range, the uniform instrument performance of illumination.
(2) the illumination detection circuit is provided with three amplification work gears, adding attenuator and do not adding under two kinds of situations of attenuator, make the illumination detection circuit in six illumination ranges, to carry out linear amplification, guaranteed the linearity that the present invention works thus in 0.1～100000lx scope, so that the present invention can satisfy the detection demand of various ccd video cameras, not only can be used for the illuminance Performance Detection of visible light CCD television camera, but also can be used as the standard sources of other purposes.Versatility characteristics of the present invention make it have good application prospects.
(3) in the present invention, place target component or personnel's the associative operation and the related data of dynamic display light source assembly brightness adjustment process that software received or pointed out testing process of controlling in the computing machine, the illumination software that places MCU is then according to the work gear of the illuminations actually measured control illumination detection circuit of illuminance transducer and be carried in magnitude of voltage on the light source assembly, finally, make the light intensity of light source assembly satisfy the luminance detection requirement of tested ccd video camera by this closed-loop control, promptly reach illumination on this video camera target surface and equal the target component that receives by computing machine.Abovementioned technology has not only improved the convenience of intelligent degree of the present invention and use, simultaneously also solved illumination instability in the existing luminance detection technology, the inaccurate problem of testing result preferably, thereby guaranteed objective evaluation examined product illumination quality.
Description of drawings
Fig. 1 is the overall formation synoptic diagram of luminance detector of the present invention.
Fig. 2 is each installation site floor map of forming in the electronic control box.
Fig. 3 is the principle of work block diagram of luminance detector of the present invention.
Fig. 4 is that the light source assembly structure shown in Fig. 1 is formed synoptic diagram.
Fig. 5 is the composition and the theory diagram of the illumination detection circuit shown in Fig. 2.
Fig. 6 is the composition and the theory diagram of the control circuit board shown in Fig. 2.
Fig. 7 is the workflow diagram of illumination Control Software.
Fig. 8 is that the operation pages that the computing machine shown in Fig. 1 shows constitutes synoptic diagram.
Fig. 9 is a workflow diagram of controlling software.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in further detail.
As shown in Figure 1 and Figure 2, the luminance detector of universal CCD camera of the preferred embodiment of the present invention comprises light source assembly 1, illuminance transducer 2, electronic control box 3 and the computing machine 4 of controlling software is housed.Electronic control box 3 contains power amplifier 3-1, control circuit board 3-2, illumination detection circuit 3-3, casing 3-4, linear power supply 3-5 and Switching Power Supply 3-6.Referring to Fig. 3, the measuring principle of luminance detector of universal CCD camera of the present invention is, after the controlling software and receive object illumination (detecting the required brightness value that reaches) by keyboard input in the computing machine 4, startup has the control circuit board 3-2 of single-chip microcomputer (MCU); Illumination Control Software among the MCU is at first controlled illumination detection circuit 3-3 by initial amplification gear engaged, make power amplifier 3-1 luminous according to certain driven light source assembly 1, the light signal of illuminance transducer 2 real-time detection light source assemblies 1 also converts electric signal to, sends into MCU again after illumination detection circuit 3-3 handles; Illumination Control Software among the MCU is according to the gear-change operation of the difference control illumination detection circuit 3-3 of illuminations actually measured and illumination threshold value, adjust the output voltage of power amplifier 3-1 according to the difference of illuminations actually measured and object illumination, the output light of light source assembly 1 is stabilized on the required illuminance of tested ccd video camera survey, thereby can implements the illuminance Performance Detection detected ccd video camera.
According to shown in Figure 4, the light source assembly 1 of this preferred embodiment adds built-in light source by parabolic reflector provides necessary big brightness illumination for detector.Light source assembly 1 comprises Lamp cup 1-1, lamp pearl 1-2, adjustable lamp socket 1-3, spring 1-4, swivel nut 1-5 and adjustable support 1-6.Lamp cup 1-1 makes of aluminum alloy materials, Lamp cup 1-1 be shaped as parabola and parabolic bottom is provided with the installation convex, convex is installed is provided with the anti-spin slot that external thread and center pit and center pit one end are provided with two symmetries; The inside surface of Lamp cup 1-1; Be coated with metallic reflective coating, its reflectivity is 85%, and outside surface is processed with many radiating grooves, and surfaceness is 0.08.The Lamp cup that adopts aluminum alloy materials to make has overcome shortcomings such as the heat transfer of simple glass Lamp cup is poor, fragile, difficulty of processing is big.Lamp pearl 1-2 selects 24V 250W Philips halogen tungsten lamp pearl for use, and its brightness can be adjusted on a large scale, and high-high brightness can reach 9000lm.Adjustable lamp socket 1-3 one end has circumferentially prominent edge, and other end central authorities have the connector of installation lamp pearl 1-2 and the anti-convex that revolves that outer wall is provided with two symmetries.At the bottom of the swivel nut 1-5 one end band and bottom surface is provided with cable-through hole.Lamp cup 1-1 is fixed on the adjustable support 1-6; Lamp pearl 1-2 is installed on the connector of adjustable lamp socket 1-3, and the installation convex center pit of the outer wall of adjustable lamp socket 1-3 and Lamp cup 1-1 is slidingly matched and adjustable lamp socket 1-3 anti-revolved the anti-spin slot that convex is positioned at Lamp cup 1-1; Spring 1-4 is enclosed within on the outer wall of adjustable lamp socket 1-3 and two ends withstand on adjustable lamp socket 1-3 respectively circumferentially prominent edge and Lamp cup 1-1 install on the end face of convex, swivel nut 1-5 be threaded with Lamp cup 1-1 and the cable-through hole of lead-in wire by swivel nut of connector in draw.By adjusting adjustable support 1-6 light source assembly 1 is moved along the vertical direction; By rotation swivel nut 1-5, drive adjustable lamp socket 1-3 and lamp pearl 1-2 moves axially, the luminescent center of lamp pearl 1-2 is positioned on the paraboloidal focus, light becomes parallel beam after the parabolic direct reflection.This light source assembly 1 has solved illumination that light beam arrives the ccd video camera target surface at 100000lx or equal to change between the 0.1lx illumination range and the problem of illuminance uniformity, has overcome generally and makes the defective that light source brings with integrating sphere.
As shown in Figure 5, illumination detection circuit 3-3 comprises gear controller, amplifier and wave filter.Gear controller is made of level driver and four relays, and level driver drives the corresponding relays action according to the level controling signal of control circuit board 3-1 output.The major function of amplifier is under the control of gear controller, to the output signal of illuminance transducer 2 carry out the amplification of corresponding multiplying power and will amplify after signal send into wave filter.In this preferred embodiment, amplifier is made of ICL7650 chip and several groups of resistance of two cascades, the one ICL7650 chip is that the first order is amplified, its first input resistance is 10K Ω, the first amplification resistance R 1 is 10K Ω, second to amplify resistance R 2 be 100K Ω, and first, second amplifies resistance R 1, the R2 enlargement ratio of 1 times of correspondence and 10 times respectively; The 2nd ICL7650 chip is that amplify the second level, and its second input resistance is 2K Ω, and the 3rd to amplify resistance R 3 be 20K Ω, and the 4th to amplify resistance R 4 be 200K Ω, and the 3rd, the 4th amplifies the enlargement ratio of 10 times of resistance R 3, R4 difference correspondence and 100 times.In this preferred embodiment, the first and the 3rd resistance R 1 and R3 constitute 10 times enlargement ratio, and the second and the 3rd resistance R 2 and R3 constitute 100 times enlargement ratio, and third and fourth resistance R 3 and R4 constitute 1000 times enlargement ratio.First to fourth resistance R, 1～R2 inserts in the corresponding amplifying circuit by first to fourth relay respectively.When relay receives the high level drive signal, resistance that is attached thereto and amplifying circuit conducting, and receive the low level drive signal, the resistance that is attached thereto then disconnects with amplifying circuit.In this preferred embodiment, the illumination interval of three gears dividing according to illuminance transducer 2, amplifier also correspondingly is provided with three and amplifies gears, and first gear is meant that the first and the 3rd relay is driven by high level simultaneously; Second gear is that the second and the 3rd relay is driven by high level simultaneously; Third gear is meant that third and fourth relay is driven by high level simultaneously.In other words, first, second, third gear of amplifier respectively corresponding the enlargement ratio of 10 times of amplifier, 100 times and 1000 times; Pairing illumination range is respectively 0.1～20lx, 20～800lx, 800～10000lx.No matter which gear amplifier is operated in, and its output voltage values is as long as between 0.5～9V, just with this gear illumination range in corresponding brightness value definite linear relationship is arranged.Wave filter is the active low-pass filter that electric capacity and resistance constitute, and main effect is the radio-frequency component in the filtering amplifier output signal, reduces the spontaneous interference of signal, improves the accuracy of acquisition of signal, and filtered signal is sent among the control circuit board 3-2.
As shown in Figure 6, have MCU, A/D converter, D/A converter, RS232 interface on the control circuit board 3-2.MCU has four I/O ports and the illumination Control Software is housed, and first to fourth I/O port links to each other with first to fourth relay respectively.The output signal of amplifier is sent among the MCU through A/D converter among the illumination detection circuit 3-3; The RS232 interface can be realized the communication between MCU and the computing machine 4; The gear control signal that MCU sends is given gear controller by four I/O ports, and its voltage control signal that sends is given power amplifier 3-1 by D/A converter.The illumination Control Software contains acquisition module, filtration module, gear control module, voltage control module, transport module.The function of acquisition module is to gather the current output of illumination detection circuit 3-3 in real time and be converted into corresponding brightness value by A/D converter; The function of filtration module is that the brightness value after converting is carried out anti-interference filtration, obtains a metastable current brightness value to reject the burr that is caused by undesired signal.The function of gear control module is: set the initialization gear for the amplifier of illumination detection circuit 3-3; Current brightness value is compared with the lower limit illumination threshold value and the upper limit illumination threshold value of current gear respectively, if lower limit illumination threshold value less than current gear, send the signal that upgrades accordingly to four I/O ports, if current gear is when third gear, then send prompting and remove the attenuator instruction,, send the signal that lowers category accordingly to four I/O ports as if upper limit illumination threshold value greater than current gear to transport module, if current gear in the time of first grade, then sends prompting to transport module and adds the attenuator instruction; Send gear information and current brightness value to transport module; Current brightness value is sent into voltage control module.In through calibrated preferred embodiment, the lower limit illumination threshold value of first gear and upper limit illumination threshold value are respectively 0.1lx and 20lx, the lower limit illumination threshold value of second gear and upper limit illumination threshold value are respectively 20lx and 800lx, and the lower limit illumination threshold value of third gear and upper limit illumination threshold value are respectively 800lx and 10000lx.Above-mentioned six illumination threshold values leave in the storer of MCU in advance, and call in the data buffer when the initialization of illumination Control Software.The function of voltage control module is, current brightness value and object illumination value are compared, if greater than the object illumination value, send out to transport module and to reduce voltage-regulation instruction, if less than the object illumination value, send out the instruction of increase voltage-regulation to transport module,, send out the latch voltage instruction and arrive bit instruction to transport module if equal the object illumination value; Pressing to the transport module generating according to the instruction of turning off the light is zero instruction.In this preferred embodiment, in order to reach the object illumination value under the prerequisite of error range fast satisfying, at three of amplifier amplify gears set three kinds different from bit error, wherein, first gear is ± 0.1lx, second gear is ± 1lx, and third gear ± 10lx is as long as the difference of current brightness value and object illumination value satisfies and just thinks that to bit error current brightness value equals the object illumination value on the current gear.The function of transport module is: the object illumination value of sending by RS232 interface receiving computer also deposits the data buffer in, turn off the light instruction and give voltage control module that receiving computer sends; According to different voltage-regulation instructions, the voltage of D/A converter being sent into power amplifier 3-1 carries out the correspondence adjusting; According to voltage is zero instruction, D/A converter is sent into the voltage of power amplifier 3-1 and is directly reduced to zero; According to the voltage lock instruction, the current magnitude of voltage of D/A converter being sent into power amplifier 3-1 locks; With hint instructions, give the software of controlling in the computing machine by the loopback of RS232 interface to the current input voltage of bit instruction, gear information, current brightness value, power amplifier 3-1.No matter increase the voltage-regulation instruction and still reduce the voltage-regulation instruction, its pairing voltage-regulation amount is identical, and in this preferred embodiment, the voltage-regulation amount is made as 0.02V.The operating process of illumination Control Software is referring to Fig. 7.
Below in conjunction with this preferred embodiment using method of the present invention is described.
At first, open the power switch of electronic control box 3 and computing machine 4, after operation pages occurring on the display screen of computing machine 4, in " illumination input " hurdle, import the required detection brightness value that reaches of detected ccd video camera by keyboard, according to the prompt text that ejects in operation pages " attenuator indication " hurdle, the tester adds or removes attenuator by suggestion content on illuminance transducer 2; Afterwards, " transmission " button on the clicking operation page, at this moment, " RUN " pilot lamp is lighted, immediately, show related data in each display field on the operation pages, operation along with each circuit board in the electronic box, on the operation pages in each display field data presented constantly change, the luminous intensity of light source assembly 1 also constantly changes, the brightness value of the brightness value that shows in " illuminations actually measured " display field on operation pages and keyboard input equates, on the operation pages in each display field data presented locking and " OK " pilot lamp bright, so far light source assembly 1 provides a stable and uniform illuminance environment.At this moment, can take illuminance transducer 2 away and place detected ccd video camera on this position, whether the target surface that operating personnel observe detected ccd video camera saturated phenomenon occurs, whether satisfies index request with this illumination performance of judging detected ccd video camera.Detection finishes, and clicks " turning off the light " button in computing machine 4 operation pages, and the lamp pearl in the light source assembly 1 until extinguishing, is after this closed the power switch of electronic box 3 and computing machine 4 with slow deepening.
Claims (3)
1. luminance detector of universal CCD camera, comprise light source assembly [1], electronic control box [3], it is characterized in that: also comprise can the adapted attenuator illuminance transducer [2], the computing machine [4] of operational module is housed, described electronic control box [3] contains the control circuit board [3-2] of being with single-chip microcomputer, power amplifier [3-1] and illumination detection circuit [3-3], described light source assembly [1] contains Lamp cup [1-1], the continuously adjustable lamp pearl of luminous intensity [1-2] and be used to support the adjustable support [1-6] of described Lamp cup [1-1], Lamp cup [1-1] is a parabolic reflector, and described lamp pearl [1-2] is installed on the Lamp cup [1-1] by connector and the luminescent center of lamp pearl [1-2] is positioned on the focus of parabolic reflector; Illumination detection circuit [3-3] by the gear controller that contains several relays, can realize that the amplifier of three kinds of enlargement ratios, the wave filter that is used for the filtering high-frequency signal constitute, gear controller is according to the varying level control signal of described control circuit board [3-2] output, drive the corresponding relays action so that amplifier is operated in corresponding amplification gear, amplifier carries out the amplification of corresponding multiplying power to the detectable signal of described illuminance transducer and amplifying signal is sent into wave filter carry out filtering; Described single-chip microcomputer is equipped with the illumination control module, this illumination control module contains acquisition module, filtration module, gear control module, voltage control module, transport module, and acquisition module is gathered the current output of described wave filter in real time and is converted into corresponding brightness value by A/D converter; Filtration module carries out anti-interference filtration and obtains stable current brightness value the brightness value after converting; The function of gear control module is to judge described current brightness value whether in the illumination range of amplifier work at present gear, if not, sends to described gear controller and to upgrade or downshift command; The function of voltage control module is to judge whether described current brightness value equals the object illumination value, if not, sends the regulating command that increases voltage or reduce voltage to transport module, if yes, then sends the voltage lock instruction to transport module; The function of transport module is the described object illumination value sent of receiving computer and deposits the data buffer in, according to increasing voltage or reducing the voltage-regulation instruction, D/A converter being sent into the magnitude of voltage of described power amplifier [3-1] regulates accordingly, according to lock instruction, the magnitude of voltage of D/A converter being sent into described power amplifier [3-1] locks; Described operational module comprises that page module, brightness value connect/send out module, and the function of page module is that the operation pages that contains " illumination input " hurdle, " attenuator indication " hurdle, " transmission " button is provided on described computer screen; The function that brightness value connect/sent out module is, brightness value U in reception is input to described " illumination input " hurdle also judges that whether this brightness value U is greater than 10000lx, if not, to make the object illumination value be U and eject the text prompt of " removing attenuator " in " attenuator indication " hurdle, if yes, to make the object illumination value be U/A and eject the text prompt of " adding attenuator " in " attenuator indication " hurdle, A is the illumination adjustment factor, after receiving " transmission " button command, send described object illumination value to described single-chip microcomputer.
2. luminance detector of universal CCD camera according to claim 1, it is characterized in that: described light source assembly also comprises the swivel nut [1-5] at the bottom of adjustable lamp socket [1-3], spring [1-4] and the end band, adjustable lamp socket [1-3] end has circumferentially prominent edge, and other end outer wall is provided with the anti-convex that revolves of two symmetries; Described connector is installed in the other end central authorities of adjustable lamp socket [1-3]; Described Lamp cup [1-1] afterbody is provided with band external thread and the installation convex of center pit and the anti-spin slot that center pit one end is provided with two symmetries; The installation convex center pit of the outer wall of described adjustable lamp socket [1-3] and described Lamp cup [1-1] is slidingly matched and adjustable lamp socket [1-3] anti-revolved the anti-spin slot that convex is positioned at Lamp cup [1-1]; Described spring [1-4] is enclosed within on the installation convex of the outer wall of described adjustable lamp socket [1-3] and circumferentially dash forward edge and Lamp cup [1-1] that two ends withstand on adjustable lamp socket [1-3] respectively; Described swivel nut [1-5] is threaded with the installation convex of described Lamp cup [1-1].
3. luminance detector of universal CCD camera according to claim 1 and 2 is characterized in that: described lamp pearl [1-2] is selected the halogen tungsten lamp pearl for use; Described page module also is provided with " turning off the light " button, when described transport module receives " turning off the light " button command of described computing machine transmission, it is zero instruction that described voltage control module is sent voltage to transport module, and the magnitude of voltage that output module is sent D/A converter into described power amplifier [3-1] directly reduces to zero.
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| CN2009100233890A CN101608950B (en) | 2009-07-21 | 2009-07-21 | Luminance detector of universal CCD camera |
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| CN102128688B (en) * | 2010-01-18 | 2012-10-31 | 华东师范大学 | Method and system for measuring light color performance of laser display |
| CN102387631B (en) * | 2010-10-19 | 2013-09-11 | 刘江 | Automatic judgment and adjustment method of light intensity in immunochromatography interpretation recorder |
| CN102519586B (en) * | 2011-12-28 | 2014-03-05 | 广州合成材料研究院有限公司 | Irradiance meter for laboratory and method for implementing irradiance meter |
| CN103376156A (en) * | 2012-04-20 | 2013-10-30 | 肖晓飞 | Optical power collection system with software |
| CN103017896B (en) * | 2012-11-29 | 2015-06-03 | 广东欧珀移动通信有限公司 | Illumination photometry method and illumination photometry device |
| CN103676313B (en) * | 2013-11-29 | 2017-02-15 | 合肥京东方光电科技有限公司 | Illumination intensity adjustment method, device and system |
| CN103856051B (en) * | 2014-03-26 | 2016-04-27 | 中国科学院光电技术研究所 | High-voltage square wave gain driving signal amplitude control device |
| KR101944868B1 (en) * | 2016-12-30 | 2019-04-17 | (주)현대포멕스 | Automatic light control apparatus capable of regulating output of light apparatus according to distance between light apparatus and subject |
| CN108776004B (en) * | 2018-06-20 | 2024-07-02 | 深圳市漫反射照明科技有限公司 | Lighting auxiliary design system and lighting auxiliary design method thereof |
| CN108896173A (en) * | 2018-07-09 | 2018-11-27 | 哈尔滨工业大学 | Automatic scanning formula irradiance measuring system and method |
| CN108895344A (en) * | 2018-07-30 | 2018-11-27 | 鹰利视医疗科技有限公司 | A kind of cold light source with light-measuring mechanism |
| TWI711807B (en) * | 2018-09-18 | 2020-12-01 | 廣達電腦股份有限公司 | Illuminance calibration device, illuminance calibration method and illuminance detecting method |
| CN109520972A (en) * | 2018-12-04 | 2019-03-26 | 青岛理工大学 | Hierarchical visibility measuring method and device |
| CN110057549B (en) * | 2019-04-08 | 2021-06-01 | Tcl华星光电技术有限公司 | Light source illumination detection method and system |
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| CN1591531A (en) * | 2003-08-27 | 2005-03-09 | 株式会社日立制作所 | Image display apparatus, display unit driver and image display method for the same |
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| CN1591531A (en) * | 2003-08-27 | 2005-03-09 | 株式会社日立制作所 | Image display apparatus, display unit driver and image display method for the same |
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