CN102548156B - Self-adaptive brightness control system and method for multichannel infrared LED (Light-Emitting Diode) target spot - Google Patents
Self-adaptive brightness control system and method for multichannel infrared LED (Light-Emitting Diode) target spot Download PDFInfo
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Abstract
The invention discloses a self-adaptive brightness control system and method for a multichannel infrared LED (Light-Emitting Diode) target spot, belonging to the field of vision measurement. The system comprises a host computer decision module, a communication circuit module and an optical target spot brightness control circuit module, wherein the optical target spot brightness control circuit module consists of a singlechip control unit, an indicating unit, a multistage voltage switching unit, a PWM (Pulse-Width Modulation) generator, a push-pull circuit and an infrared LED; and the push-pull circuit consists of a PNP triode and an NPN triode. According to the system and the method, dynamic adjustment of LED working current from certain milliampere and hundreds of milliampere can be realized, and the brightness control problem of the optical target spot in high-coverage vision measurement is solved; and the system and the method play important roles in high-accuracy vision dynamic tracking, detecting, positioning and the like of the infrared LED serving as a target spot.
Description
technical field
The present invention relates to a kind of multichannel infrared LED target spot adaption brightness control system and control method thereof, belong to vision measurement field.
background technology
Machine vision metrology technology owing to having fast, in real time, flexibly and compared with advantages such as high measurement accuracies, more and more for the measurement of the on-the-spot workpiece three-dimensional profile of industrial production, reference characteristic space coordinates and position and attitude.Compare the features such as the point, line, surface that measured object itself exists naturally, optics target spot easily extracts, and can increase the distance of measurement, improve certainty of measurement, so the geometric properties that uses the optics target spot being arranged on measured object indirectly to measure measured object is a kind of effective metering system.
Optics target spot imaging facula center accurately location is important foundation and the key link of vision measurement technology.Through testing and verification, use infrared LED (Light Emitting Diode) as optics target spot, and Gauss curved matching is carried out in optics target spot imaging facula center and locate the target spot center image coordinate that can obtain degree of precision.But the prerequisite of this image position method is imaging facula is reliable and stable Gaussian Profile.Large vision measurement within the vision relates generally to multiple above-mentioned LED optics target spots, and DYNAMIC DISTRIBUTION is in the scope apart from several meters to tens meters, camera, one show the stability that improves centralized positioning for ensureing that optics target spot all can all meet the requirement of Gauss's location algorithm and make everywhere target spot imaging facula distribute at large imaging facula within the vision, need to be according to target spot the different distributions position in space to LED target spot brightness carry out adaptive control.
At present, more towards the LED brilliance control report in general lighting field, but be not suitable for the requirement of high-precision vision measurement for infrared LED target spot brightness regulation scope and degree of regulation completely towards control method and the control system of general lighting.Infrared LED target spot brightness adjustment approach mainly contains two classes: a class is that the mode of utilizing A/D conversion chip to change driving voltage regulates the size that flows through infrared LED continuous current, the method linearity is good, but owing to directly carrying out brightness adjusting by changing electric current, the colour temperature drift that can make LED emit beam, affects luminous mass; The more important thing is, allow the continuous current of passing through generally not allow to exceed 100mA for conventional infrared LED, in the time carrying out telemeasurement, also cannot adjust the LED brightness meeting the demands with sustained ceiling current allowable; Meanwhile, control the requirement of multiple infrared LEDs by changing the more difficult realization of circuit topological structure of voltage-regulation electric current simultaneously.Another kind of is to adopt LED multi-path to drive chip by PWM(Pulse Width Modulation) mode regulates the average current size that flows through infrared LED, use the luminosity of each infrared LED of PWM mode independent regulation, under which, the driving voltage of infrared LED is constant, so electric current when LED conducting is a definite value, adopt the turn-on and turn-off of the pulse signal control LED of high frequency, regulate the ratio of turn-on and turn-off time to realize average current size adjustment by the method for pulse pulse width modulation, the advantage of the method is to realize the luminosity of simultaneously controlling multichannel infrared LED, degree of regulation is high, but be subject to the restriction of chip gross power, each paths of LEDs dimming scope is very limited.
summary of the invention
The present invention proposes a kind of multichannel infrared LED target spot brightness adaptive control system and control method thereof, solved the brightness adaptive control problem of optics target spot in the vision measurement of the large visual field.
The present invention adopts following technical scheme for solving its technical problem:
A kind of multichannel infrared LED target spot adaption brightness control system, be linked in sequence and form by communication interface by host computer decision-making module, communication circuit module, optics target spot intednsity circuit module, wherein, host computer decision-making module is to be formed by industrial CCD camera, image pick-up card and two-way being linked in sequence of Computer Analysis decision package; Communication circuit module is made up of main communicating circuit and secondary communicating circuit, and main communicating circuit is connected by wireless signal with secondary communicating circuit; Optics target spot intednsity circuit module is made up of Single-chip Controlling unit, indicating member, multilevel voltage switch unit, PWM generator, push-pull circuit and infrared LED, Single-chip Controlling unit is connected with indicating member, multilevel voltage switch unit and PWM generator respectively, multilevel voltage switch unit is connected with n bar push-pull circuit, PWM generator is also connected with n bar push-pull circuit, n is natural number, and every push-pull circuit is all linked in sequence with infrared LED.
Described communication circuit module has two kinds of communication modes: wired and wireless.
Described push-pull circuit is made up of positive-negative-positive triode and NPN type triode.
The control method of multichannel infrared LED target spot adaption brightness control system, comprises the steps:
(1) with given initial value make optics target spot intednsity circuit module and communication circuit module in running order, Computer Analysis decision package to industrial CCD collected by camera to image analyze, cross bright or cross dark information and the decision-making of centralized positioning precision result and go out brightness regulation parameter according to LED hot spot, and by parameter read-in PWM generator, regulate each road output pwm signal duty ratio, be applied to infrared LED by push-pull circuit carries out, after brilliance control, taking next time;
(2) host computer decision-making module is sent to main communicating circuit by communication interface RS232 by control information, control information comprise measure unlatchings, the light modulation of single channel target spot, the normal operation detection of hardware, false alarm, to host computer feedback processing information, main communicating circuit is changed signal according to the difference of communication mode: have under ray mode, signal to be converted to antijamming capability is strong, the RS485 differential signal of long transmission distance, be sent to Single-chip Controlling unit by communication interface; Wireless mode is next is converted to wireless carrier by signal, and secondary communicating circuit is converted to RS485 differential signal after receiving wireless carrier, is sent to Single-chip Controlling unit by communication interface;
(3) Single-chip Controlling unit receives after control information, corresponding action is resolved and carried out to information, if there is the decision-making order of switched voltage in control information, Single-chip Controlling unit starting multilevel voltage switch unit switches the size of " maximum On current "; The brightness regulation parameter comprising in resolving information, drives PWM generator according to the requirement of host computer decision-making module, redefines the impulse waveform of duty ratio size, and drives the luminosity of push-pull circuit Dui Ge road infrared LED to carry out independence self-adapting adjusting;
(4) Single-chip Controlling unit is in fill order or execute after order, feed back to host computer decision-making module command execution signal, each control information all will be fed back executive signal to host computer decision-making module after carrying out, whether its operating state of grasping all the time optics target spot intednsity circuit module and order are correctly carried out, and the execution information of measuring command feedback is the triggering signal that industrial CCD camera carries out IMAQ simultaneously.
Described optics target spot intednsity circuit module adopts PWM technology that PWM duty cycle signals is provided, the push-pull circuit that design is made up of positive-negative-positive triode and NPN type triode is as the direct driving of infrared LED, pwm signal carries out light modulation to LED target spot indirectly by push-pull circuit, increase multilevel voltage switch unit to change by the maximum On current of LED at push-pull circuit input, thereby improve LED brightness regulation precision, improve adjustable range, using Single-chip Controlling unit as response host computer decision-making module, by the various command of Single-chip Controlling unit resolves host computer decision-making module, and drive optics target spot intednsity circuit module to carry out decision-making order.
At host computer decision-making module end, design one group of adjusting parameter list that contains multiple brightness degrees, sequentially parameter list is designed to from small to large to first close rear thin non-homogeneous hash form by brightness adjusting, to meet the requirement of closely light modulation precision and remote dimming scope; The LED that Computer Analysis decision package draws according to target spot positioning analysis result crosses the bright or dark information of mistake, in adjusting parameter list, adopt the strategy such as binary search or inertia search, decision-making goes out applicable adjusting parameter, send to PWM generator to produce the PWM of corresponding duty ratio via Single-chip Controlling unit, carry out the adjusting of LED self adaptation, provide failure of adjustment signal until meet the indicating member of positioning accuracy request or notice single-chip microcomputer control unit.
Host computer decision-making module sends control command by communication circuit module to Single-chip Controlling unit, and triggers the generation interruption of Single-chip Controlling unit; Single-chip Controlling unit, in interrupt routine, by the host-host protocol of control command, receives the data that host computer decision-making module sends over, and data is carried out to verification; If data meet protocol requirement, complete every control according to the particular content of order by Single-chip Controlling unit, comprise measure unlatchings, the light modulation of single channel target spot, the normal operation detection of hardware, false alarm, to host computer decision-making module feedback processing information; Complete after a control operation in Single-chip Controlling unit, to related register set or zero clearing, and the decision information of wait host computer decision-making module next time.
Beneficial effect of the present invention is as follows:
The present invention can realize LED operating current several milliamperes of adjustings of arriving between hundreds of milliampere, and can ensure that the LED adjustable range under LED degree of regulation and the telemeasurement under close-in measurement all meets the demands, and has solved the brightness adaptive control problem of optics target spot in the vision measurement of the large visual field well.The present invention for the high-precision vision taking infraluminescence LED as target dynamically follow the tracks of, detect, location etc. is significant.
brief description of the drawings
Fig. 1 is multichannel infrared LED target spot adaption brightness composition of the control system structure chart.
Fig. 2 is push-pull circuit schematic diagram.
Fig. 3 is the control flow chart of Single-chip Controlling unit.
Fig. 4 is host computer decision-making module Computer analysis decision element analysis decision flow diagram.
Fig. 5 is optics target spot intednsity circuit module principle figure in the present invention.
Fig. 6 is the schematic diagram of communication circuit module in the present invention.
Fig. 7 is the schematic diagram of secondary communicating circuit in the present invention.
Fig. 8 is in the present invention 1.5 meters--target spot imaging facula distribution map within the scope of 10 meters.
Fig. 9 is different distance spot center intensity profile statistics in the present invention.
Figure 10 is that in the present invention, maximum On current is the electric current grade-adjustable table under 70mA.
Figure 11 is that in the present invention, maximum On current is the electric current grade-adjustable table under 200mA.
specific embodiment
Below in conjunction with accompanying drawing, the invention is described in further details.
Control system structure of the present invention as shown in Figure 1, be linked in sequence and form by communication interface by host computer decision-making module, communication circuit module, optics target spot intednsity circuit module, wherein, host computer decision-making module is to be formed by industrial CCD camera, image pick-up card and two-way being linked in sequence of Computer Analysis decision package; Communication circuit module is made up of main communicating circuit and secondary communicating circuit, and main communicating circuit is connected by wireless signal with secondary communicating circuit; Optics target spot intednsity circuit module is made up of Single-chip Controlling unit, indicating member, multilevel voltage switch unit, PWM generator, push-pull circuit and infrared LED, Single-chip Controlling unit is connected with indicating member, multilevel voltage switch unit and PWM generator respectively, multilevel voltage switch unit is connected with n bar push-pull circuit, PWM generator is also connected with n bar push-pull circuit, n is natural number, and every push-pull circuit is all linked in sequence with infrared LED.
In the present invention, LED target spot brightness self-adaptation control method is described in detail as follows:
(1) adopt positive-negative-positive triode and NPN type triode to form push-pull circuit and directly drive infrared LED, and PWM generator is carried out light modulation to LED target spot indirectly by push-pull circuit.So both can realize PWM dimming function, can increase by push-pull circuit again the driving power of LED, can realize LED target spot at multi-level dynamic light adjustment in a big way.Push-pull circuit as shown in Figure 2.
(2) be to meet light modulation precision under nearlyer measuring distance and the requirement of remote lower dimming scope, at push-pull circuit power input increase multilevel voltage switch unit simultaneously.When telemeasurement, automatically switch to large driving voltage to meet the requirement of infrared LED dimming scope, when close-in measurement, be switched to little driving voltage so that brightness regulation precision is met.
(3) using Single-chip Controlling unit as the control core unit of response host computer decision-making module.The host-host protocol of having formulated every control command between host computer decision-making module and Single-chip Controlling unit, comprises data format, data volume and verification mode etc.Host computer decision-making module sends control command by communication interface to Single-chip Controlling unit, and triggers the generation interruption of Single-chip Controlling unit; Single-chip Controlling unit, in interrupt routine, by the host-host protocol of control command, receives the data that host computer decision-making module sends over, and data is carried out to verification.If data meet protocol requirement, complete every control according to the particular content of order by Single-chip Controlling unit, comprise measure unlatchings, the light modulation of single channel target spot, the normal operation detection of hardware, false alarm, to host computer decision-making module feedback processing information etc.; Complete after a control operation in Single-chip Controlling unit, to related register set or zero clearing, and the decision information of wait host computer decision-making module next time.Fig. 3 is the control flow chart of Single-chip Controlling unit.
(4), at host computer decision-making module end, the maximum On current calculating according to tapping voltage, has designed one group of adjusting parameter list that contains multiple brightness degrees.For adapting to the requirement of closely light modulation precision and remote dimming scope, sequentially parameter list is designed to from small to large to first close rear thin non-homogeneous hash form by brightness adjusting.The LED that Computer Analysis decision package draws according to target spot positioning analysis result crosses the bright or dark information of mistake, in adjusting parameter list, adopt the strategy such as binary search or inertia search, decision-making goes out applicable adjusting parameter, send to PWM generator to produce the PWM of corresponding duty ratio via Single-chip Controlling unit, carry out the adjusting of infrared LED self adaptation, provide failure of adjustment signal until meet the indicating member of positioning accuracy request or notice single-chip microcomputer control unit.Fig. 4 is host computer machine decision-making module Computer Analysis decision package analysis decision flow chart.
Single-chip Controlling unit in Fig. 1 uses microcontroller PIC16F873A, and PWM generator adopts LED to drive chip MAX6964, forms push-pull circuit with positive-negative-positive triode S8050 and NPN type triode S8550.Adopt the SE3470 type infrarede emitting diode of Honeywell company production as the feature target spot in vision measurement.
Optics target spot intednsity circuit module principle figure as shown in Figure 5, adopts big or small two step voltage switching modes, and design is used for closely accurately brightness regulation by the maximum On current of LED at 70mA, and maximum On current regulates for long-distance large-range at 200mA.Therefore, push-pull circuit is connect after the pull-up resistor of 50 Ω, connect HK4100F-DC5V-5H type relay.Relay two ends connect respectively 5V DC power supply and 12V DC power supply, and by switch triode 2N3906 and TLP512 photoisolator, the I/O that receives single-chip microcomputer controls mouth.Single-chip Controlling unit, according to the decision-making of host computer decision-making module, is controlled relay, to switch the operating voltage being carried on push-pull circuit, thereby changes maximum On current size.According to MAX6964 output port feature, MAX6964 output port is connect to 5V DC power supply by 10k Ω pull-up resistor, and via after 74HC04 type inverter and 3.65k Ω current-limiting resistance, receive push-pull circuit, for regulating the average current by LED.By the I2C serial line interface of PIC single-chip microcomputer and MAX6964 chip, complete the independent regulation control to each paths of LEDs brightness in conjunction with above-mentioned push-pull circuit and Control.
The schematic diagram of communication circuit module as shown in Figure 6.Can use wired and wireless two kinds of data transfer modes.When data send, first use MAX232 chip that Computer Analysis decision package is converted to two-way Transistor-Transistor Logic level signal by the data of self RS232 communication interface transmission, one road signal is after photoelectricity isolation, be converted to differential signal by MAX490 chip, by the wired transmission of RS485 interface, data are delivered to Single-chip Controlling unit, wireless receiving and dispatching interface is accessed in another road after 74HC04 type inverter promotes load capacity, and on this interface connects, wireless transceiver can be delivered to secondary communicating circuit by data by wireless mode.When data receiver, have under ray mode, Single-chip Controlling unit sends to the data of Computer Analysis decision package to be delivered to after main communicating circuit by RS485 interface with differential signal, use MAX490 chip to be converted to Transistor-Transistor Logic level signal, level signal accesses MAX232 chip and carries out passing to Computer Analysis decision package by RS232 communication interface after level conversion after TLP512 photoisolator; Under wireless mode, wireless transceiver receives after data, presses serial protocol send data with Transistor-Transistor Logic level signal from delivery outlet, increases load capacity through inverter, and by after MAX232 chip level conversion, pass to Computer Analysis decision package by RS232 communication interface.
Secondary communicating circuit as shown in Figure 7.It is operated in wireless mode, use CC1100 type wireless transceiver and MAX490 chip to realize the mutual conversion of Transistor-Transistor Logic level signal and differential signal, use TLP512 photoelectrical coupler to carry out photoelectricity isolation, cooperating main communicating circuit under wireless mode is realized wireless mode communication function.
At host computer decision-making module end, according to the maximum On current of 70mA and 200mA, the present embodiment has designed one group of adjusting parameter list that contains 50 brightness degrees, and parameter list is designed to first close rear thin non-homogeneous hash form.According to LED spot location analysis result, adopt binary search strategy, if LED is excessively bright, the bound using parameter gauge outfit and current adjusting parameter as region of search, if LED is excessively dark,, using current adjusting parameter and parameter list tail as the bound of region of search, regulate parameter using the intermediate value of region of search as the next one, send to MAX6964 to carry out the adjusting of LED self adaptation via Single-chip Controlling unit, until meet positioning accuracy request.
Target spot location algorithm requires target spot imaging facula in wide-field measuring range, to distribute unanimously.Fig. 8 is given in target spot imaging facula within the scope of 1.5--10 rice and distributes; Under different distance, the hot spot distribution degree of consistency is high as seen from the figure.
It is the another important requirement of target spot location algorithm that the center brightness of hot spot is stablized.Within the scope of 1.5--10 rice, get respectively ten apart from node, each apart from gathering 300 images on node, spot center Luminance Distribution is carried out to mathematical statistics.Fig. 9 has shown the spot center Luminance Distribution statistics under four different distance.As seen from the figure, result meets gaussian random and distributes, and center brightness is stable.
It is 70mA(small-power that Figure 10 and Figure 11 have provided respectively maximum On current) lower and maximum On current is that 200mA(is high-power) lower electric current adjusting grade.Electric current adjustable range is at 0.29mA--140mA as seen from the figure.Meet the requirement of light regulation within the scope of 1.5--10 rice.Therefore the method providing with the present invention can realize the self adaptation light modulation of multichannel infrared LED target spot, both can meet in-plant light modulation required precision, can meet again remote dimming scope requirement.
Claims (3)
1. a multichannel infrared LED target spot adaption brightness control system, it is characterized in that being linked in sequence and forming by communication interface by host computer decision-making module, communication circuit module, optics target spot intednsity circuit module, wherein, host computer decision-making module is to be formed by industrial CCD camera, image pick-up card and two-way being linked in sequence of Computer Analysis decision package, optics target spot intednsity circuit module is made up of Single-chip Controlling unit, indicating member, multilevel voltage switch unit, PWM generator, push-pull circuit and infrared LED, Single-chip Controlling unit is connected with indicating member, multilevel voltage switch unit and PWM generator respectively, multilevel voltage switch unit is connected with n bar push-pull circuit, PWM generator is also connected with n bar push-pull circuit, n is natural number, and every push-pull circuit is all linked in sequence with infrared LED, described push-pull circuit is made up of positive-negative-positive triode and NPN type triode, communication circuit module is made up of main communicating circuit and secondary communicating circuit, divide wire communication and two kinds of modes of wireless telecommunications, main communicating circuit is connected with host computer by communication interface RS232, secondary communicating circuit is connected with optics target spot intednsity circuit by communication interface RS485, main communicating circuit is connected by wireless signal with secondary communicating circuit, forms wireless telecommunications, main communicating circuit also can adopt wired mode to turn RS485 adapter by RS232 to be directly connected with optics target spot intednsity circuit, forms wire communication, optics target spot intednsity circuit module, adopt big or small two step voltage switching modes, design is used for closely accurately brightness regulation by the maximum On current of LED at 70mA, maximum On current regulates for long-distance large-range at 200mA, at host computer decision-making module end, according to the maximum On current of 70mA and 200mA, design one group of adjusting parameter list that contains 50 brightness degrees, parameter list is designed to first close rear thin non-homogeneous hash form, the LED that Computer Analysis decision package draws according to target spot positioning analysis result crosses the bright or dark information of mistake, in adjusting parameter list, adopt binary search strategy, decision-making goes out applicable adjusting parameter, send to PWM generator to produce the PWM of corresponding duty ratio via Single-chip Controlling unit, pwm signal carries out light modulation to LED target spot indirectly by push-pull circuit, the operating voltage being carried on push-pull circuit by switching at push-pull circuit input increase multilevel voltage switch unit is passed through the maximum On current size of LED to change, carry out the adjusting of LED self adaptation.
2. a control method that is applied to multichannel infrared LED target spot adaption brightness control system claimed in claim 1, is characterized in that, comprises the steps:
(1) with given initial value make optics target spot intednsity circuit module and communication circuit module in running order, Computer Analysis decision package to industrial CCD collected by camera to image analyze, design one group of adjusting parameter list that contains multiple brightness degrees, sequentially parameter list is designed to from small to large to first close rear thin non-homogeneous hash form by brightness adjusting, to meet the requirement of closely light modulation precision and remote dimming scope, the LED that Computer Analysis decision package draws according to target spot positioning analysis result crosses the bright or dark information of mistake, in adjusting parameter list, adopt the strategy such as binary search or inertia search, decision-making goes out applicable adjusting parameter, and by parameter read-in PWM generator, regulate each road output pwm signal duty ratio, pwm signal carries out light modulation to LED target spot indirectly by push-pull circuit, increase multilevel voltage switch unit to change by the maximum On current of LED at push-pull circuit input, thereby improve LED brightness regulation precision, improve adjustable range, carry out after brilliance control, take next time,
(2) host computer decision-making module is sent to main communicating circuit by communication interface RS232 by control information, control information comprise measure unlatchings, the light modulation of single channel target spot, the normal operation detection of hardware, false alarm, to host computer feedback processing information, main communicating circuit is changed signal according to the difference of communication mode: have under ray mode, signal to be converted to antijamming capability is strong, the RS485 differential signal of long transmission distance, be sent to Single-chip Controlling unit by communication interface; Wireless mode is next is converted to wireless carrier by signal, and secondary communicating circuit is converted to RS485 differential signal after receiving wireless carrier, is sent to Single-chip Controlling unit by communication interface;
(3) Single-chip Controlling unit receives after control information, corresponding action is resolved and carried out to information, if there is the decision-making order of switched voltage in control information, Single-chip Controlling unit starting multilevel voltage switch unit switches the size of " maximum On current "; The brightness regulation parameter comprising in resolving information, drives PWM generator according to the requirement of host computer decision-making module, redefines the impulse waveform of duty ratio size, and drives the luminosity of push-pull circuit Dui Ge road infrared LED to carry out independence self-adapting adjusting;
(4) Single-chip Controlling unit is in fill order or execute after order, feed back to host computer decision-making module command execution signal, each control information all will be fed back executive signal to host computer decision-making module after carrying out, whether its operating state of grasping all the time optics target spot intednsity circuit module and order are correctly carried out, and the execution information of measuring command feedback is the triggering signal that industrial CCD camera carries out IMAQ simultaneously.
3. the control method of multichannel infrared LED target spot adaption brightness control system according to claim 2, it is characterized in that host computer decision-making module sends control command by communication circuit module to Single-chip Controlling unit, and trigger the generation interruption of Single-chip Controlling unit; Single-chip Controlling unit, in interrupt routine, by the host-host protocol of control command, receives the data that host computer decision-making module sends over, and data is carried out to verification; If data meet protocol requirement, complete every control according to the particular content of order by Single-chip Controlling unit, comprise measure unlatchings, the light modulation of single channel target spot, the normal operation detection of hardware, false alarm, to host computer decision-making module feedback processing information; Complete after a control operation in Single-chip Controlling unit, to related register set or zero clearing, and the decision information of wait host computer decision-making module next time.
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