CN106375645A - Infrared-camera-device-based adaptive control system - Google Patents
Infrared-camera-device-based adaptive control system Download PDFInfo
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- CN106375645A CN106375645A CN201510430788.4A CN201510430788A CN106375645A CN 106375645 A CN106375645 A CN 106375645A CN 201510430788 A CN201510430788 A CN 201510430788A CN 106375645 A CN106375645 A CN 106375645A
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Abstract
The invention relates to an infrared-camera-device-based adaptive control system. A gain value of automatic gain control of an infrared camera device is obtained; if the gain value is larger than or equal to a preset first threshold value, the infrared camera device is controlled to start a black-and-white shooting mode; and the brightness of an infrared ray of the infrared camera device is adjusted in real time based on the gain value, so that the infrared camera device can adapt to an external shooting environment. According to the technical scheme, the black-and-white shooting mode can be started only by determining the gain value size corresponding to the current external shooting environment brightness information instead of setting a photoresistor, so that the infrared camera device can enter a night working state. Furthermore, the infrared camera device can adjust the brightness of the infrared ray based on changing of the external shooting environment, thereby avoiding an overexposure phenomenon, improving an image effect, and reducing power consumption of the infrared camera device.
Description
Technical field
The present invention relates to thermal camera automatic control technology field, more particularly, to one kind are based on infrared photography
The adaptive control system of device.
Background technology
Existing thermal camera is usually by imageing sensor, image-signal processor, microprocessor (such as
Single-chip microcomputer) and infrared light board (inclusion photoconductive resistance) constitute, it is possible to achieve day and night automatically the cutting of mode of operation
Change.The method of work of this automatic switchover is: the photobehavior due to the photoconductive resistance on infrared light board can be with
The change of environmental light brightness and change, infrared light board can provide a reflection environmental light brightness change
Analog voltage signal to single-chip microcomputer, single-chip microcomputer is determined according to this analog voltage signal by ad sampling works as
Front environmental light brightness state.When environmental light brightness is dimmed, single-chip microcomputer detects analog voltage signal and is less than
During a certain setting value, Single-chip Controlling thermal camera turns black and white image pickup mode and opens infrared lamp；When
Environmental light brightness brightens, when single-chip microcomputer detects analog voltage signal more than a certain setting value, single-chip microcomputer control
Video camera processed turns colored image pickup mode and cuts out infrared lamp.Although this method of work achieves a day night work
The automatic switchover of operation mode, but still there is certain defect, specifically include: one, infrared light board increases
On the one hand photoconductive resistance, increases cost, on the other hand due to the service life of photoconductive resistance itself, quality,
End the restriction of infrared optical property etc., when service life is long, photoconductive resistance itself can produce photosensitive property
Decline, the cut-off phenomenon such as infrared light is insufficient, lead to the time point day and night switching inconsistent with preset value,
The oscillatory occurences being led to due to photoconductive resistance reason itself is possibly even occurred.Two, single-chip microcomputer is to infrared lamp
Control be the mode taking high and low level directly to open, close, there is no algorithm controls, increased red
The overall power consumption of outer video camera.Three, occur under some special scenes due to the brightness of infrared lamp stronger
And the phenomenon producing picture overexposure (during as tested at the scene, is in the range of normal distance, thermal camera
Direct irradiation face, will produce face overexposure phenomenon sometimes, affect picture effect).
Content of the invention
It is an object of the invention to provide a kind of adaptive control system based on infrared eye, Neng Gou
Night operation state is automatically switched to and according to extraneous imaging environment in the case of being not provided with photoconductive resistance
Change adjusts ultrared brightness, it is to avoid overexposure phenomenon.
According to an aspect of the present invention, a kind of adaptive control system based on infrared eye, bag
Include infrared eye and microprocessor,
Described infrared eye, for carrying out image taking day and night；
Described microprocessor, carries out the automatic gain control of image shoot process for obtaining infrared eye
The yield value of system, when described yield value is more than or equal to preset first threshold value, controls infrared eye to open
Dynamic black and white image pickup mode the ultrared brightness according to described yield value real-time regulation infrared eye,
To allow infrared eye adapt to extraneous shooting environmental.
Wherein, described infrared eye includes imageing sensor and infrared light supply；
Described image sensor, for shooting external image；
Described infrared light supply, is used for sending infrared ray, so that described image sensor is in extraneous shooting environmental
Shoot external image in the case of brightness deficiency；
Described control infrared eye starts black and white image pickup mode, comprising:
Infrared eye is controlled to be switched to black and white state and open infrared light supply so that it is pre- for sending brightness
If the infrared ray of upper limit luminance threshold.
Wherein, the described ultrared brightness according to described yield value real-time regulation infrared eye, bag
Include:
By controlling the dutycycle of the pwm ripple of described infrared light supply, at interval of predetermined period according to described increasing
Beneficial value adjusts the ultrared brightness that described infrared light supply sends.
Wherein, described preset upper limit luminance threshold is during the pwm ripple 100% dutycycle output of infrared light supply
Brightness.
Wherein, described predetermined period is 500ms.
Wherein, the described ultrared brightness according to described yield value real-time regulation infrared eye, with
Just infrared eye is allowed to adapt to extraneous shooting environmental, comprising:
The change of the brightness with extraneous shooting environmental for the described yield value and change；
If described yield value is less than or equal to default Second Threshold, control the infrared of described infrared eye
The ultrared brightness that light source reduction sends, to allow described yield value increase to preset gain stable region
In the range of；
When described ultrared brightness is decreased to less than equal to pre-determined lower limit luminance threshold and described yield value
During less than or equal to default Second Threshold, infrared eye is controlled to start colored image pickup mode；
Wherein, described default Second Threshold is the lower limit of preset gain stable region.
Wherein, described pre-determined lower limit luminance threshold is during the pwm ripple 15% dutycycle output of infrared light supply
Brightness.
Wherein, described control infrared eye starts colored image pickup mode, comprising:
Infrared eye is controlled to be switched to color state and close infrared light supply.
Wherein, described microprocessor, is additionally operable to:
When described yield value is in the range of described preset gain stable region, control described infrared light supply
The infrared ray brightness sending is constant.
Wherein, described microprocessor, is additionally operable to:
When described yield value increases to the scope beyond described preset gain stable region, control described red
The ultrared brightness that outer light source increase sends, to allow described yield value be decreased to preset gain stable region
Between in the range of.
Wherein, the described ultrared brightness according to described yield value real-time regulation infrared eye, bag
Include:
When yield value >=described preset first threshold value and described ultrared brightness is not preset upper limit brightness
During threshold value, the regulation step-length controlling the pwm ripple of described infrared light supply is default first step-length；
When described preset first threshold value > the yield value >=(higher limit of preset gain stable region+default first
Jump in brightness switching threshold) and when described ultrared brightness is not preset upper limit luminance threshold, control institute
The regulation step-length stating the pwm ripple of infrared light supply is default second step-length；
When (higher limit of preset gain stable region+default first jump in brightness switching threshold) > yield value
The higher limit of >=preset gain stable region and described ultrared brightness is not preset upper limit luminance threshold
When, the regulation step-length controlling the pwm ripple of described infrared light supply is default 3rd step-length；
When default 3rd jump in brightness switching threshold≤yield value < (lower limit of preset gain stable region-
Default second jump in brightness switching threshold) and when described infrared light supply is not turned off, control described infrared light
The regulation step-length of the pwm ripple in source is default 4th step-length；
When (lower limit of preset gain stable region-default second jump in brightness switching threshold)≤yield value
The lower limit of≤preset gain stable region and when described infrared light supply is not turned off, controls described infrared
The regulation step-length of the pwm ripple of light source is default 5th step-length.
Wherein, the described ultrared brightness according to described yield value real-time regulation infrared eye, also
Including:
When described yield value≤default 3rd jump in brightness switching threshold, control infrared eye switching
To color state and close infrared light supply.
Wherein ,+the 20% of 100% dutycycle of a length of pwm ripple of the described default first step, described default second
Step-length is+the 10% of 100% dutycycle of pwm ripple, and described default 3rd step-length is 100% duty of pwm ripple
+ the 3% of ratio, described default 4th step-length is-the 10% of 100% dutycycle of pwm ripple, the described default 5th
Step-length is-the 3% of 100% dutycycle of pwm ripple.
The present invention provides a kind of adaptive control system based on infrared eye, by obtaining infrared taking the photograph
As the yield value of the automatic growth control of device, if described yield value is more than or equal to preset first threshold value,
Infrared eye is controlled to start black and white image pickup mode and according to described yield value real-time regulation infrared photography
The ultrared brightness of device, to allow infrared eye adapt to the technical scheme of extraneous imaging environment,
Achieve and photoconductive resistance need not be set, only pass through judgement corresponding with current outside imaging environment monochrome information
The size of yield value can start black and white image pickup mode, makes infrared eye enter night operation state,
Further, infrared eye also can adjust ultrared brightness according to the change of extraneous imaging environment,
Avoid the occurrence of overexposure phenomenon, improve image effect, reduce the power consumption of infrared eye simultaneously.
Brief description
Fig. 1 is the adaptive control system according to first embodiment of the invention based on infrared eye
Block diagram.
Fig. 2 is the adaptive control system according to second embodiment of the invention based on infrared eye
Block diagram.
Fig. 3 is the adaptive control system according to third embodiment of the invention based on infrared eye
Block diagram.
Fig. 4 is the adaptive control system according to third embodiment of the invention based on infrared eye
Infrared ray brightness regulation principle schematic.
Fig. 5 is the adaptive control system according to third embodiment of the invention based on infrared eye
Infrared ray brightness regulation process step-length setting principle schematic.
Fig. 6 is the adaptive control system according to third embodiment of the invention based on infrared eye
Program flow diagram.
Specific embodiment
For making the object, technical solutions and advantages of the present invention of greater clarity, with reference to being embodied as
Mode referring to the drawings, the present invention is described in more detail.It should be understood that these descriptions are example
Property, and it is not intended to limit the scope of the present invention.Additionally, in the following description, eliminate to known knot
Structure and the description of technology, to avoid unnecessarily obscuring idea of the invention.
It should be understood that hereinafter, agc (automatic gain control, automatic growth control)
For reflection outside illumination inside isp (image signal processing, image signal processing unit)
One yield value of information, when brightness is high, yield value is little, and when brightness is low, yield value is high.pwm(pulse width
Modulation, pulse width modulation) be using microprocessor (as single-chip microcomputer) numeral output come to simulation
A kind of technology that circuit is controlled.Photoconductive resistance is a kind of sensor devices, and the size of resistance value can be with
The change of external environment monochrome information and change.
First embodiment
The following is the present invention provides the first embodiment party of the adaptive control system based on infrared eye
Formula.Fig. 1 is the adaptive control system according to first embodiment of the invention based on infrared eye
Block diagram.
A kind of adaptive control system based on infrared eye, including infrared eye and microprocessor
Device.
This infrared eye, for carrying out image taking day and night.
Infrared eye carries out image taking day and night it is necessary to intelligently between day and night mode of operation
Switch over.Infrared eye is mainly the switching realizing day and night mode of operation by infrared filter,
Open optical filter during the day, with stop infrared ray enter ccd (charge coupled device,
Charge-coupled image sensor), allow ccd can only sense visible ray, infrared eye starts colored image pickup mode,
Infrared eye is made to enter the state that works by day；Night vision or illumination condition bad in the state of, optical filter stops
Only work (or switching optical filter), no longer stops that infrared ray enters ccd, infrared ray reflects laggard through object
Enter camera lens to be imaged, infrared eye starts black and white image pickup mode, so that infrared eye is entered at nightfall
Late working condition.
This microprocessor, carries out the automatic growth control of image shoot process for obtaining infrared eye
Yield value, when described yield value be more than or equal to preset first threshold value when, control infrared eye start
Black and white image pickup mode the ultrared brightness according to described yield value real-time regulation infrared eye,
To allow infrared eye adapt to extraneous shooting environmental.
Specifically, microprocessor includes obtaining gain module, starts black and white module and real-time regulation module.
Obtain gain module, carry out the automatic gain control of image shoot process for obtaining infrared eye
The yield value of system.
Yield value (agc) is actual to be exactly that the amplification to amplifier a is automatically controlled (regulation),
Using degenerative principle, the amplitude of output signal is sampled, obtain a control voltage, with anti-
To the amplification adjusting a.
Start black and white module, for when yield value is more than or equal to preset first threshold value, controlling infrared photography
Device starts black and white image pickup mode.
Preferably, preset first threshold value corresponds to night threshold value, is labeled as thnight.
Real-time regulation module, for, on the basis of starting black and white image pickup mode, adjusting in real time according to yield value
The ultrared brightness of section infrared eye, to allow infrared eye adapt to extraneous shooting environmental.
Obtain gain module and realize yield value acquisition function, and the yield value of acquisition is sent to startup black and white
Module.Start black and white module according to the yield value receiving, judge to start the opportunity of black and white image pickup mode,
And when yield value is more than or equal to preset first threshold value, start black and white image pickup mode.Real-time regulation module exists
On the basis of starting black and white image pickup mode, ultrared according to yield value real-time regulation infrared eye
Brightness, to allow infrared eye adapt to extraneous shooting environmental.
The adaptive control system based on infrared eye that embodiment of the present invention provides, need not be arranged
Photoconductive resistance, just only passes through the size of judgement yield value corresponding with current outside imaging environment monochrome information
Black and white image pickup mode can be started, make infrared eye enter night operation state, further, infrared
Camera head also can adjust ultrared brightness according to the change of extraneous imaging environment, it is to avoid overexposure existing
As improving image effect, reducing the power consumption of infrared eye simultaneously.
Second embodiment
The following is the present invention provides the second embodiment party of the adaptive control system based on infrared eye
Formula.Fig. 2 is the adaptive control system according to second embodiment of the invention based on infrared eye
Block diagram.This second embodiment and the adaptive control system first based on infrared eye
The differring primarily in that of embodiment, increased to starting black and white image pickup mode and real-time regulation is infrared takes the photograph
The content being specifically described as the process of the ultrared brightness of device.
As shown in Fig. 2 on the basis of first embodiment, the infrared photography dress of this second embodiment
Put including imageing sensor and infrared light supply；
Imageing sensor, for shooting external image.
Infrared light supply, is used for sending infrared ray, so that imageing sensor is brightness in extraneous shooting environmental
External image is shot in the case of deficiency.
Preferably, start black and white module, specifically for when yield value be more than or equal to preset first threshold value when,
Control infrared eye to be switched to black and white state and open infrared light supply so that sending brightness is on default
The infrared ray of limit luminance threshold.
Preferably, preset upper limit luminance threshold is bright during the pwm ripple 100% dutycycle output of infrared light supply
Degree.The corresponding infrared eye of this brightness is switched to brightness during black and white state.
Preferably, real-time regulation module, specifically for, on the basis of starting black and white image pickup mode, passing through
Control the dutycycle of the pwm ripple of infrared light supply, at interval of predetermined period, infrared light supply is adjusted according to yield value
The ultrared brightness sending, to allow infrared eye adapt to extraneous shooting environmental.
Preferably, predetermined period is 500ms.
Pwm ripple i.e. the impulse waveform of variable duty ratio.Pwm ripple controls, that is, to semiconductor switch device
Turn-on and turn-off be controlled, so that outfan is obtained a series of amplitudes are equal and the unequal pulse of width,
Replace sine wave or other required waveforms with these pulses, by the width to each pulse for certain rule
Degree is modulated.Wherein, pwm ripple can be exported by single-chip microcomputer itself, for controlling the infrared of infrared light supply
Line brightness degree.
The adaptive control system based on infrared eye that embodiment of the present invention provides, by isp
Obtain the agc value of the monochrome information of reflection current outside imaging environment, infrared by judging that agc value is realized
Camera head color work state, to the switching of black and white working condition, and is automatically adjusted infrared using pwm ripple
The brightness of line, makes infrared eye reach object brightness and will not produce overexposure phenomenon.
The adaptive control system based on infrared eye that embodiment of the present invention provides, is in tradition
It is automatically obtained colored image pickup mode after cancelling photoconductive resistance on the infrared light board of infrared eye to take the photograph to black and white
As the system of pattern switching, can be applicable to field of video monitoring.And this adaptive control system can automatic root
According to the monochrome information of extraneous imaging environment, realize infrared ray brightness regulation by controlling pwm dutycycle size.
3rd embodiment
The following is the present invention provides the 3rd embodiment party of the adaptive control system based on infrared eye
Formula.Fig. 3 is the adaptive control system according to third embodiment of the invention based on infrared eye
Block diagram.3rd embodiment and the adaptive control system first based on infrared eye
The differring primarily in that of embodiment, increased to starting colored image pickup mode and real-time regulation is infrared takes the photograph
The content being specifically described as the process of the ultrared brightness of device.
As shown in figure 3, the startup black and white on the basis of first embodiment, in this 3rd embodiment
Module, specifically for when yield value is more than or equal to preset first threshold value, controlling infrared eye switching
To black and white state and open infrared light supply in case send brightness be preset upper limit luminance threshold infrared ray.
Real-time regulation module, specifically for:
The change of the brightness with extraneous shooting environmental for the yield value and change；
If yield value is less than or equal to default Second Threshold, the infrared light supply of infrared eye is controlled to reduce
The ultrared brightness sending, to allow yield value to increase in the range of preset gain stable region；
When ultrared brightness is decreased to less than equal to pre-determined lower limit luminance threshold and yield value is less than or equal to
During default Second Threshold, infrared eye is controlled to start colored image pickup mode.
Wherein, infrared eye is controlled to start colored image pickup mode, comprising:
Infrared eye is controlled to be switched to color state and close infrared light supply.
Wherein, default Second Threshold is the lower limit of preset gain stable region.Preferably, preset second
Threshold value threshold value on corresponding daytime, is labeled as thday.
Preferably, pre-determined lower limit luminance threshold is bright during the pwm ripple 15% dutycycle output of infrared light supply
Degree.
Preferably, microprocessor is additionally operable to when yield value is in the range of preset gain stable region, control
The infrared ray brightness that infrared light supply processed sends is constant.Specifically, brightness stability module can be set and realize this work(
Energy.
Wherein, microprocessor, is additionally operable to increase to the scope beyond preset gain stable region when yield value
When, control the ultrared brightness that infrared light supply increase sends, to allow yield value be decreased to preset gain
In the range of stable region.Specifically, increase brightness module can be set and realize this function.
Brightness stability module and the scope that increase brightness module is for yield value and preset gain stable region
Magnitude relationship, the respond module that the ultrared brightness that infrared light supply is sent is controlled.
Specifically, this embodiment middle infrared (Mid-IR) brightness regulation principle is as shown in figure 4, Fig. 4 is according to this
Invent the infrared ray brightness regulation of the adaptive control system based on infrared eye of the 3rd embodiment
Principle schematic.
As shown in figure 4,3 stages are specifically divided into based on the adaptive control system of infrared eye,
It is respectively as follows:
A- is color to turn black: when single-chip microcomputer detects agc and is more than thnight, controls infrared eye to turn
To black and white state, switch optical filter, start black and white image pickup mode, make infrared eye enter night work
Make state and controlled by pwm, fully open infrared light supply.
B- adjusts the infrared ray brightness of infrared light supply: this stage implements process and is also classified into 3 kinds of situations,
3 intervals of (1), (2) and (3) in corresponding Fig. 4.
(1) interval: when infrared eye is switched to black and white working condition, when infrared light supply stays open,
Single-chip microcomputer real-time detection agc value, when agc is detected less than thday, single-chip microcomputer passes through to control pwm
Ripple dutycycle reduces infrared ray brightness, so that agc is increased to and enters into preset gain stable region；Work as agc
After entering this preset gain stable region, keep infrared ray brightness constant；Brightness when external environment
Continue to increase, when agc is again less than thday, reducing infrared ray brightness again, to make agc enter into default
Gain stabilization is interval；Until infrared ray brightness be reduced to pre-determined lower limit luminance threshold (i.e. infrared light supply standard-sized sheet,
15% of brightness during the pwm ripple 100% dutycycle output of infrared light supply) when, do not continue to reduce infrared
The brightness of line, now judges whether agc is less than thday, and in this way, then (switching filters to execute black turn of coloured silk
Piece, starts colored image pickup mode, makes infrared eye enter the state that works by day, and closes infrared light
Source).
(2) interval: after agc enters into preset gain stable region, such as now because external environment becomes
Change and make luminance-reduction, agc continues to increase, after agc departs from preset gain stable region, then infrared ray
Brightness also can increase therewith, makes agc be again introduced into preset gain stable region.
(3) interval: after agc enters this preset gain stable region, infrared lamp brightness keeps constant.
Black turn of coloured silk of c-: after infrared ray brightness regulation process terminates, single-chip microcomputer detects agc and is less than thday
When, control infrared eye to go to color state, switch optical filter, start colored image pickup mode, make
Infrared eye enters the state that works by day, and closes infrared light supply.
Process for the infrared ray brightness adjusting infrared light supply above by pwm ripple is it is contemplated that whole adjust
Section process to the time required for stable and in the range of different agc required benefit infrared ray brightness
The situation (indoor black and white environment is turned on light suddenly) of the difference of degree and external environmental light jump in brightness, needs
It is respectively provided with the regulation step-length of different pwm ripples in different agc scopes, to realize optimal regulation effect
Really.
Wherein, this embodiment middle infrared (Mid-IR) brightness regulation process step-length setting principle as shown in figure 5,
Fig. 5 is red based on the adaptive control system of infrared eye according to third embodiment of the invention
The principle schematic of the step-length setting of outside line brightness regulation process.
Real-time regulation module, for, on the basis of starting black and white image pickup mode, adjusting in real time according to yield value
The ultrared brightness of section infrared eye, to allow infrared eye adapt to extraneous shooting environmental.
Preferably, the ultrared brightness according to yield value real-time regulation infrared eye, comprising:
When yield value >=preset first threshold value and when ultrared brightness is not preset upper limit luminance threshold,
The regulation step-length controlling the pwm ripple of infrared light supply is default first step-length；
Work as preset first threshold value > the yield value >=(higher limit of preset gain stable region+default first brightness
Abrupt change threshold value) and when ultrared brightness is not preset upper limit luminance threshold, control infrared light supply
The regulation step-length of pwm ripple is default second step-length；
When (higher limit of preset gain stable region+default first jump in brightness switching threshold) > yield value
The higher limit of >=preset gain stable region and when ultrared brightness is not preset upper limit luminance threshold,
The regulation step-length controlling the pwm ripple of infrared light supply is default 3rd step-length；
When default 3rd jump in brightness switching threshold≤yield value < (lower limit of preset gain stable region-
Default second jump in brightness switching threshold) and when infrared light supply is not turned off, control the pwm of infrared light supply
The regulation step-length of ripple is default 4th step-length；
When (lower limit of preset gain stable region-default second jump in brightness switching threshold)≤yield value
The lower limit of≤preset gain stable region and when infrared light supply is not turned off, control the pwm of infrared light supply
The regulation step-length of ripple is default 5th step-length.
Preferably ,+the 20% of 100% dutycycle of a length of pwm ripple of the default first step, default second step is a length of
+ the 10% of 100% dutycycle of pwm ripple, presets+the 3% of 100% dutycycle that the 3rd step-length is pwm ripple,
Default 4th step-length is-the 10% of 100% dutycycle of pwm ripple, presets the 5th step-length for the 100% of pwm ripple
- the 3% of dutycycle.
Above-mentioned percentage ratio represents that pwm opens, the degree of closing, total size are 0-100%.
Corresponding above-mentioned five kinds of situations, can be further described below:
As agc >=thnight and when pwm does not have 100% unlatching, adjusting step-length is every time+20%.
When agc>=<thnight and pwm does not have for the higher limit+0x10 of preset gain stable region, agc
When having 100% unlatching, adjusting step-length is each+10%.Wherein, preset the first jump in brightness switching threshold pair
Brightness abrupt scene when answering external environment to be dark, is labeled as 0x10.Preset gain stable region upper
Limit value mainly determines according to the brightness of image in debugging image process when night low-light (level).
Higher limit when the higher limit of agc>=preset gain stable region, agc<preset gain stable region
+ 0x10 and when pwm does not have 100% unlatching, adjusting step-length is every time+3%.
As agc>=0x08, agc<thday-0x10, and when pwm is not completely turned off, adjust step-length
For every time -10%.Wherein, preset light when the corresponding external environment of the second jump in brightness switching threshold is bright
Degree abrupt scene, is labeled as 0x10.Default second jump in brightness switching threshold can be with default first brightness
Abrupt change threshold value equal it is also possible to unequal.Default 3rd jump in brightness switching threshold corresponding external world ring
Brightness abrupt scene when border is bright, is labeled as 0x08.
When agc >=thday-0x10, agc≤thday and pwm are not completely turned off, adjust step
A length of each -3%.Wherein, thday is the lower limit of preset gain stable region.Preset gain is stable
Interval lower limit mainly determines according to the brightness of image in debugging image process when night high illumination.
This microprocessor, is additionally operable to, when yield value≤default 3rd jump in brightness switching threshold, control red
Outer camera head is switched to color state and cuts out infrared light supply.Specifically, the colored mould of startup can be set
Block realizes this function.
Start colored module according to the yield value receiving, judge to start the opportunity of colored image pickup mode, and
In yield value≤default 3rd jump in brightness switching threshold, start colored image pickup mode.
Preferably, preset the 3rd jump in brightness switching threshold and correspond to 0x08.Adjusting infrared ray brightness
Cheng Zhong, judges whether agc is less than 0x08, in this way, then infrared eye is converted into work on daytime at once
Make state, and close infrared light supply.
Fig. 6 is the adaptive control system according to third embodiment of the invention based on infrared eye
Program flow diagram.
Including above-mentioned various situations are included by this program flow diagram, according to this program flow diagram, it is right to arrange
Should adaptive control system based on infrared eye control program.The control strategy of this control program
Using software algorithm realize, with strong applicability, different schemes only need to change corresponding switching threshold and
Adjust the pwm step-length controlling infrared ray brightness.
The adaptive control system based on infrared eye that embodiment of the present invention provides, can be red
Save what the cost avoiding of photoconductive resistance was caused by photoconductive resistance quality problems itself on outer camera head
Day and night change oscillation problem；The infrared ray brightness degree of infrared light supply can also accurately be automatically controlled, will not
Occur in the picture exposure problems that night state leads to because infrared ray light filling is excessively bright, improve image effect,
Also the power consumption of infrared eye can be reduced simultaneously.
One of ordinary skill in the art will appreciate that all or part of step realizing above-mentioned embodiment is permissible
Completed by hardware it is also possible to the hardware being instructed correlation by program is completed, this program can store
In a computer-readable recording medium, storage medium can include memorizer, disk or CD etc..
It should be appreciated that the above-mentioned specific embodiment of the present invention is used only for exemplary illustration or explanation
The principle of the present invention, and be not construed as limiting the invention.Therefore, in the spirit without departing from the present invention and
Any modification, equivalent substitution and improvement done in the case of scope etc., should be included in the guarantor of the present invention
Within the scope of shield.Additionally, claims of the present invention be intended to fall into scope and
Whole in the equivalents on border or this scope and border change and modifications example.
Claims (13)
1. a kind of adaptive control system based on infrared eye, including infrared eye and
Microprocessor it is characterised in that
Described infrared eye, for carrying out image taking day and night；
Described microprocessor, carries out the automatic gain of image shoot process for obtaining infrared eye
The yield value controlling, when described yield value is more than or equal to preset first threshold value, controls infrared photography dress
Put startup black and white image pickup mode the infrared ray according to described yield value real-time regulation infrared eye
Brightness to allow infrared eye adapt to extraneous shooting environmental.
2. the adaptive control system based on infrared eye according to claim 1, its
It is characterised by, described infrared eye includes imageing sensor and infrared light supply；
Described image sensor, for shooting external image；
Described infrared light supply, is used for sending infrared ray, so that described image sensor shoots ring extraneous
Border is shooting external image in the case of brightness deficiency；
Described control infrared eye starts black and white image pickup mode, comprising:
Control infrared eye is switched to black and white state and opens infrared light supply and to send brightness is
The infrared ray of preset upper limit luminance threshold.
3. the adaptive control system based on infrared eye according to claim 2, its
It is characterised by, the described ultrared brightness according to described yield value real-time regulation infrared eye,
Including:
By controlling the dutycycle of the pwm ripple of described infrared light supply, at interval of predetermined period according to described
Yield value adjusts the ultrared brightness that described infrared light supply sends.
4. the adaptive control system based on infrared eye according to claim 3, its
It is characterised by, when described preset upper limit luminance threshold is the pwm ripple 100% dutycycle output of infrared light supply
Brightness.
5. the adaptive control system based on infrared eye according to claim 3, its
It is characterised by, described predetermined period is 500ms.
6. the self adaptation based on infrared eye according to claim 1 to 5 any one
Control system is it is characterised in that described red according to described yield value real-time regulation infrared eye
The brightness of outside line, to allow infrared eye adapt to extraneous shooting environmental, comprising:
The change of the brightness with extraneous shooting environmental for the described yield value and change；
If described yield value is less than or equal to default Second Threshold, control the red of described infrared eye
The ultrared brightness that outer light source reduction sends, so that it is stable to allow described yield value increase to preset gain
In interval scope；
When described ultrared brightness is decreased to less than equal to pre-determined lower limit luminance threshold and described gain
When value is less than or equal to default Second Threshold, infrared eye is controlled to start colored image pickup mode；
Wherein, described default Second Threshold is the lower limit of preset gain stable region.
7. the adaptive control system based on infrared eye according to claim 6, its
It is characterised by, when described pre-determined lower limit luminance threshold is the pwm ripple 15% dutycycle output of infrared light supply
Brightness.
8. the adaptive control system based on infrared eye according to claim 6, its
It is characterised by, described control infrared eye starts colored image pickup mode, comprising:
Infrared eye is controlled to be switched to color state and close infrared light supply.
9. the adaptive control system based on infrared eye according to claim 6, its
It is characterised by that described microprocessor is additionally operable to:
When described yield value is in the range of described preset gain stable region, control described infrared light
The infrared ray brightness that source sends is constant.
10. the adaptive control system based on infrared eye according to claim 6, its
It is characterised by that described microprocessor is additionally operable to:
When described yield value increases to the scope beyond described preset gain stable region, control described
The ultrared brightness that infrared light supply increase sends, so that it is steady to allow described yield value be decreased to preset gain
In fixed interval scope.
11. adaptive control systems based on infrared eye according to claim 6, its
It is characterised by, the described ultrared brightness according to described yield value real-time regulation infrared eye,
Including:
When yield value >=described preset first threshold value and described ultrared brightness is not that preset upper limit is bright
During degree threshold value, the regulation step-length controlling the pwm ripple of described infrared light supply is default first step-length；
When described preset first threshold value > the yield value >=(higher limit of preset gain stable region+default the
One jump in brightness switching threshold) and when described ultrared brightness is not preset upper limit luminance threshold,
The regulation step-length controlling the pwm ripple of described infrared light supply is default second step-length；
When (higher limit of preset gain stable region+default first jump in brightness switching threshold) > gain
The higher limit of value >=preset gain stable region and described ultrared brightness is not preset upper limit brightness
During threshold value, the regulation step-length controlling the pwm ripple of described infrared light supply is default 3rd step-length；
When default 3rd jump in brightness switching threshold≤yield value < (lower limit of preset gain stable region
Value-default second jump in brightness switching threshold) and when described infrared light supply is not turned off, control described
The regulation step-length of the pwm ripple of infrared light supply is default 4th step-length；
When (lower limit of preset gain stable region-default second jump in brightness switching threshold)≤increasing
The lower limit of beneficial value≤preset gain stable region and when described infrared light supply is not turned off, control institute
The regulation step-length stating the pwm ripple of infrared light supply is default 5th step-length.
12. adaptive control systems based on infrared eye according to claim 11,
It is characterized in that, described ultrared bright according to described yield value real-time regulation infrared eye
Degree, also includes:
When described yield value≤default 3rd jump in brightness switching threshold, infrared eye is controlled to cut
Change to color state and close infrared light supply.
13. adaptive control systems based on infrared eye according to claim 11,
It is characterized in that ,+the 20% of 100% dutycycle of a length of pwm ripple of the described default first step, described default
+ the 10% of 100% dutycycle of second step a length of pwm ripple, described default 3rd step-length is pwm ripple
+ the 3% of 100% dutycycle, described default 4th step-length is-the 10% of 100% dutycycle of pwm ripple, institute
State-the 3% of 100% dutycycle that default 5th step-length is pwm ripple.
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