CN104754250B - The method of infrared imaging evidence-obtaining system and its correction image planes drift based on acousto-optic tunable filter - Google Patents
The method of infrared imaging evidence-obtaining system and its correction image planes drift based on acousto-optic tunable filter Download PDFInfo
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Abstract
The invention discloses the infrared imaging evidence-obtaining system based on acousto-optic tunable filter, including infrared lens, Infrared Acousto-optical Tunable Filter, Infrared imaging cameras, acousto-optic tunable filter driver, image capture module, computer and automatic correction image planes drift control.Stepper motor that automatic correction image planes drift control includes being used to focus to infrared lens, stepper motor driving circuit, the position-detection sensor and controller of focusing position for detecting infrared lens.First signal input part of controller and the interface of computer connect, and the signal output part of secondary signal input and position-detection sensor connects, and control output end is connected with the input of stepper motor driving circuit.Present invention also offers the method for above-mentioned imaging evidence-obtaining system correction image planes drift.The present invention makes the imaging band of infrared ray more accurate.In addition, the present invention can also adjust the focusing positions of infrared lens, most clearly image is obtained.
Description
Technical field
The present invention relates to the technology of forensic science criminal case crime scene evidence obtaining, more particularly to based on acousto-optic tunable filter
Infrared imaging evidence-obtaining system and its correction image planes drift method.
Background technology
Infrared ray is a kind of sightless heat ray of human eye, and it observes the laws such as straightline propagation, reflection and the refraction of light.From
The absorption to infrared ray of many materials in right boundary, the ability such as reflect, penetrate, infrared penetration different from visible ray, ultraviolet
Ability is stronger, can enter and deeper position is reached inside material, it might even be possible to which penetrating some visible rays and ultraviolet can not lead to
The material crossed.Therefore, infrared imaging is carried out to object, the object information different from visible ray and ultraviolet imagery or thin can be obtained
Section.
Field is identified in forensic science and material evidence, through showing frequently with infrared photography technology and extracting potential material evidence.Such as：
Show all kinds of writing words and the writing smeared;Carry out the discriminating of true and false coin;Take pictures also to burning the writing on paper
It is former;Outdoor haze flue dust scene is taken pictures;Vestige of being swooned to rifle shows with dust footprint;To the writing on dark cloth,
Seal, bloodstain etc. take pictures showing.Currently limited by camera devices, the infrared filter generally use length of scene evidence taking
Ripple leads to optical filtering, and because long wave leads to, optical filtering wave-length coverage is wider, is unfavorable for the discriminating of material evidence.
In addition, in forensic science and material evidence identification field, conventional infrared photography wave band is 700-1200nm.Due to infrared
Line wavelength is longer, and its penetration capacity is also stronger, therefore, it is necessary to the infrared imaging device that wavelength is more than 1200nm be researched and developed, to improve
The extractability of the potential material evidence in scene, technical support is provided for solving criminal cases.
Imaging spectrometer is developed by the principle of a variety of remote sensing instruments such as infrared line scanner and multispectral scanner, can
Scanning imagery and fine light splitting are realized simultaneously.It is on the basis of scanning imagery principle, and the wave band of image-forming radiation is divided
It is imaged into more narrow multiple wave bands, the image of more spectral bands is obtained to same scenery.Imaging spectrometer bag
Imaging unit and spectrum unit two parts are included, imaging unit is used for the aerial image to ground object target, and spectrophotometric unit is used for
Spectral band splits or spectrum dimension scanning.Spectrographic detection instrument by the difference of spectroscopic modes can be divided into optical filter type, grating type,
Fourier blade profile, diode array type, acousto-optic tunable filter（Acousto-Optic Tunable Filter, abbreviation AOTF）
Type etc..
Acousto-optic tunable filter (AOTF) is a kind of automatically controlled light filter, its principle based on acoustooptical effect, when a branch of multiple
When coloured light is by the crystal with Photoelasticity of dither, the monochromatic light of a certain wavelength will produce in crystals
Diffraction, transmitted at a certain angle from crystal, the polychromatic light that diffraction does not occur then directly transmits along the former light direction of propagation
Crystal is crossed, thus reaches the purpose of light splitting.Acousto-optic tunable filter is broadly divided into conllinear type acousto-optic tunable filter and non-
Conllinear type acousto-optic tunable filter, because non-colinear type acousto-optic tunable filter has larger bore and the angle of visual field, together
When diffraction light and non-diffraction light have certain separation angle, spatially realize separation, crystalline material is easily obtained, can be right
Natural light carries out diffraction, turns into the type being commonly used.When crystal vibration frequency changes, diffraction optical wavelength also accordingly changes
Become, here it is the general principle of acousto-optic tunable filter light splitting.
Because the light-dividing principle of acousto-optic tunable filter is different from traditional dispersion element (such as prism and grating), it
Diffraction dissociation angle, i.e. diffraction light and the angle that is spatially separating of non-diffraction light become with wavelength, are not fixed value, therefore will cause
The dispersion-shifted problem of image.The basic reason of dispersion-shifted is the TeO of acousto-optic tunable filter2Crystal is possessed in itself
Dispersion characteristics, the angle of diffraction of diffraction light change with the change of wavelength.Therefore, the image of different-waveband meeting on planar array detector
There is aberration, drift about, so as to which the unsharp phenomenon of spectrum picture, the picture to acousto-optic tunable filter spectroscopic data occur
First registration brings bigger difficulty.
The content of the invention
The technical problems to be solved by the invention are that infrared imaging can be carried out in criminal case crime scene by providing one kind
Evidence obtaining, the precision with higher infrared imaging and the infrared imaging evidence obtaining for carrying automatic correction image planes drift function
System.
Present invention also offers a kind of method of infrared imaging evidence-obtaining system correction image planes drift, it can overcome existing
Acousto-optic tunable filter type spectrum imaging system is existing to cause unsharp defect of focusing because drift occurs for image.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of infrared imaging evidence-obtaining system based on acousto-optic tunable filter, including infrared lens, infrared sound light can
Tunable filter, Infrared imaging cameras, acousto-optic tunable filter driver, image capture module, computer and automatic correction
Image planes drift control；
Infrared Acousto-optical Tunable Filter is located at after described infrared lens, and Infrared imaging cameras is located at infrared sound light can
After tunable filter, image capture module is used for the picture signal for gathering Infrared imaging cameras output, and by the image of collection
Signal is sent to computer, and the first interface of computer is connected with the input of acousto-optic tunable filter driver, and acousto-optic can
The output end of tunable filter driver and the signal input part of Infrared Acousto-optical Tunable Filter connect；
The automatic correction image planes drift control includes being used for stepper motor, the stepping electricity for focusing to infrared lens
Drive circuit, for detect infrared lens focusing position position-detection sensor and controller；The first of controller
The second interface of signal input part and computer connects, secondary signal input and the position-detection sensor of controller
Signal output part connects, and the control output end of controller is connected with the input of the stepper motor driving circuit, stepper motor
The output end of drive circuit is connected with stepper motor.
The invention also discloses a kind of above-mentioned infrared imaging evidence-obtaining system correction based on acousto-optic tunable filter
The method of image planes drift, comprises the following steps：
Step 1: the controller of correction image planes drift control sets the step motion scope and step of stepper motor automatically
It is long, the step motion scope is covered by stepper motor driving circuit Driving Stepping Motor, received according to from image capture module
Picture signal and from position-detection sensor receive position detection signal, calculate in each focusing position of infrared lens
Image focus criteria function value, and by compare to obtain maximum image focus criteria function value in the range of the step motion and
Its corresponding stepping position；
Step 2: then, the automatic controller for correcting image planes drift control sets the stepping fortune of stepper motor again
Dynamic scope and step-length, the starting point of the step motion scope set again is set in be schemed with the maximum in previous secondary stepping range of movement
As the previous stepping position of the corresponding stepping position of focus criteria function value, the terminal of the step motion scope set again is set
It is scheduled on the later stepping of the stepping position corresponding with the maximum image focus criteria function value in previous secondary stepping range of movement
Position, the step-length set again are less than the preceding step-length once set；Covered by stepper motor driving circuit Driving Stepping Motor
The step motion scope set again, connect according to the picture signal received from image capture module and from position-detection sensor
The position detection signal of receipts, the image focus criteria function value in each focusing position of infrared lens is calculated, and pass through ratio
Maximum image focus criteria function value and its corresponding stepping position in the range of the step motion relatively set again；
Step 3, repeat above-mentioned step two and reach n times, N is more than or equal to 0, and this corrects image planes drift control automatically
Controller by comparing to obtain a maximum image focus criteria function value in all step motion scopes, and control step
It is corresponding with the maximum image focus criteria function value in all step motion scopes that stepper motor drives infrared lens to be moved to
Focusing position.
After adopting the above technical scheme, the present invention has advantages below：
1st, the present invention replaces traditional aglow outside line optical filtering of long wave with Infrared Acousto-optical Tunable Filter, makes infrared ray
Imaging band is more accurate, so as to enhance distinguishing ability of the infrared imaging to similar material evidence；
2nd, the present invention is provided with automatic correction image planes drift control, its figure that can be gathered according to image capture module
As the focusing position for the lens focusing position detection signal adjustment infrared lens that signal and position-detection sensor detect, obtain
Most clearly image, so as to solve the image due to different-waveband caused by acousto-optic tunable filter self character in face battle array
Aberration is had on detector, is drifted about, so as to which the unsharp phenomenon of spectrum picture occur；
3rd, present invention employs indium gallium arsenic area array CCD infrared image sensor to be imaged, and makes what infrared imaging was collected evidence
Wave band reaches 1000 nm -1700nm, has stronger penetration capacity, so as to enhance spy of the infrared imaging to potential material evidence
Survey ability.
Brief description of the drawings
Fig. 1 is the original of the infrared imaging evidence-obtaining system according to an embodiment of the invention based on acousto-optic tunable filter
Manage block diagram.
Fig. 2 shows the theory diagram of automatic correction image planes drift control according to an embodiment of the invention.
Fig. 3 is the principle schematic of ramping constraint.
Embodiment
Further explanation is made to the present invention below in conjunction with the accompanying drawings.
It refer to Fig. 1.Infrared imaging evidence obtaining system according to an embodiment of the invention based on acousto-optic tunable filter
System, including infrared lens 1, Infrared Acousto-optical Tunable Filter 2, Infrared imaging cameras 3, acousto-optic tunable filter driver 4,
Image capture module 5, computer 6 and automatic correction image planes drift control 7.
Infrared Acousto-optical Tunable Filter 2 is located at after infrared lens 1.Infrared Acousto-optical Tunable Filter can use the U.S.
The TeO of Brimrose companies2Non-colinear type acousto-optic tunable filter, service band are 1000 ~ 1700nm, clear aperture 10 ×
10mm, spectral resolution become with diffraction centre wavelength, and excursion is 0.6 ~ 8nm.Peak value diffraction efficiency is 75%, radio frequency letter
Number modulation frequency is 60 ~ 130MHz ~ 208MHz.
Infrared imaging cameras 3 is located at after Infrared Acousto-optical Tunable Filter 2.The Infrared imaging cameras 3 is preferably indium gallium
Arsenic area array CCD infrared image sensor, valid pixel number 320 (H) × 256 (V), to the infrared of 1000-1700nm wave-length coverages
Line is sensitive, so as to have stronger penetration capacity.The Array CCD sensor completes the opto-electronic conversion of signal, electric charge is read,
A/D is changed and digital signal output, and is accompanied with controller and Pierre's patch cooling assembly.
The signal output part of acousto-optic tunable filter driver 4 inputs with the signal of Infrared Acousto-optical Tunable Filter 2
End connection, generation, conditioning, amplification and output of the frequency resolution for the RF driving signal of Hz levels can be achieved, control infrared sound
The spectral selection of the work of optic tunable filter 2, i.e. control system.
Image capture module 5 is used for the picture signal for gathering the output of Infrared imaging cameras 3, and the picture signal of collection is sent out
Give computer 6.Image capture module 4 preferably uses Camera Link image pick-up cards, is inserted in the slot of computer 6.
The first interface of computer 6 is connected with the input of acousto-optic tunable filter driver 4.Computer 6 is used for real
The overall control of existing system and scheduling, including configure the output parameter of acousto-optic tunable filter driver 4 and control its work
State, the running parameter of Infrared imaging cameras 3 is configured by image capture module 5 and controls its exposure process, storage to gather
Synchronism between picture signal, maintenance device etc..
As shown in Figure 2.Automatic correction image planes drift control 7 includes being used for the stepping for focusing to infrared lens 1
Motor 71, stepper motor driving circuit 72, for detect infrared lens 1 focusing position position-detection sensor 73 and control
Device 74 processed.First signal input part of controller 74 is connected with the second interface of computer 6, and receiving image by computer 6 adopts
The picture signal that collection module 5 collects, the secondary signal input of controller 74 and the signal output of position-detection sensor 73
End connection, receiving position detection sensor 73 export lens focusing position detection signal, the control output end of controller 74 with
The input of stepper motor driving circuit 72 is connected, and the output end of stepper motor driving circuit 72 is connected with stepper motor 71, uses
With the action of Driving Stepping Motor 71.Position-detection sensor 73 can use grating scale.The image letter that Infrared imaging cameras 3 exports
Number, it is also fed into automatic correction image planes drift being sent into after the collection of image capture module 5 while computer 6 carries out real-time display
The controller 74 for moving control device 7 carries out calculation process.Controller 74 is analyzed according to the image collected, to stepper motor
Drive circuit 72 sends control signal, adjusts the infrared lens 1 of front end, realizes automatic focusing, obtains most clearly image.
Controller 74 further comprises picture signal receiving unit 741, position detection signal receiving unit 742, driving control
Unit 743 processed and focusing control unit 744.
Picture signal receiving unit 741 is used for the picture signal for receiving image capture module 5 by computer 6 and collecting.
Position detection signal receiving unit 742 is used for the lens focusing position detection signal that receiving position detection sensor 73 exports.Drive
Dynamic control unit 743 is used to pass through the Driving Stepping Motor 71 of stepper motor driving circuit 72.Control unit 744 of focusing is used for multiple
The step motion scope and step-length of stepper motor 71 are set, is covered every time by the Driving Stepping Motor 71 of drive control unit 743
The step motion scope of setting, the picture signal received according to picture signal receiving unit 741 and position detection signal unit 742
The lens focusing position detection signal of reception, calculate the image focus criteria function in each focusing position of infrared lens 1
Value, and by comparing to obtain maximum image focus criteria function value and its corresponding stepping position in the range of each step motion
Put；Wherein, since the step motion scope and step-length of second setting stepper motor 71, after step motion scope once
Before starting point is set in the stepping position corresponding with the maximum image focus criteria function value in previous secondary stepping range of movement
One stepping position, after the terminal of step motion scope once be set in and the maximum image in previous secondary stepping range of movement is adjusted
The later stepping position of the corresponding stepping position of burnt evaluation function value, after the step-length that once sets be less than the preceding step once set
It is long；After Driving Stepping Motor 71 covers the step motion scope of all settings, the focusing control unit 744 is obtained by comparing
A maximum image focus criteria function value in all step motion scopes, and control stepper motor 71 to drive infrared lens
1 is moved to the focusing position corresponding with the maximum image focus criteria function value in all step motion scopes, so as to obtain
Most clearly image.In a specific embodiment, above-mentioned is repeatedly at least 3 times, above-mentioned image focus criteria function
Value can use the image focus criteria function value in spatial domain, and its specific algorithm is known, and the image focus criteria function value calculated is got over
Big representative image is more clear.
Infrared imaging evidence-obtaining system according to an embodiment of the invention based on acousto-optic tunable filter it is worked
Journey approximately as：Target optical spectrum is incided in Infrared Acousto-optical Tunable Filter 2 by infrared lens 1, and acousto-optic tunable filters
Device driver 4 produces rf signal and is applied in Infrared Acousto-optical Tunable Filter 2.In Infrared Acousto-optical Tunable Filter 2
TeO2The transducer of crystal one end produces ultrasonic wave in excited crystal surface under radiofrequency signal effect, is formed in plane of crystal
Diffraction grating, the propagation by plane of crystal light wave is influenceed, so by changing radiofrequency signal source frequency size, it is possible to change
By the wavelength of the light wave of Infrared Acousto-optical Tunable Filter 2, so as to purposefully select spectral wavelength, reach the purpose of light splitting.
After Infrared Acousto-optical Tunable Filter 2, the light of selected spectral band is detected by Infrared imaging cameras 3, forms
The spectrum picture of corresponding spectral band, by correcting image planes drift control 7 automatically, fine setting optical infrared camera lens 1, obtain most
Picture rich in detail, storage is finally gathered into computer 6 by image capture module 5.
The invention also discloses a kind of infrared imaging evidence-obtaining system correction image planes drift based on acousto-optic tunable filter
The method of shifting, comprises the following steps：
Step 1: the controller 74 of correction image planes drift control 7 sets the step motion model of stepper motor 71 automatically
Enclose and step-length, the step motion scope is covered by the Driving Stepping Motor 71 of stepper motor driving circuit 72, adopted according to from image
Collect the picture signal that module 5 receives and the position detection signal received from position-detection sensor 73, calculate in infrared lens 1
Each focusing position image focus criteria function value, and adjusted by comparing to obtain maximum image in the range of the step motion
Burnt evaluation function value and its corresponding stepping position；The stepping position of stepper motor 71 is to close correspondingly with focusing position
System, stepper motor 71 often walk a stepping position, can correspondingly drive infrared lens 1 to advance to a focusing position；
Step 2: then, the automatic controller 74 for correcting image planes drift control 7 sets the step of stepper motor 71 again
Enter range of movement and step-length, the starting point of the step motion scope set again be set in in previous secondary stepping range of movement most
The previous stepping position of the corresponding stepping position of big image focus criteria function value, the end of the step motion scope set again
Point is set in the latter of the stepping position corresponding with the maximum image focus criteria function value in previous secondary stepping range of movement
Stepping position, the step-length set again are less than the preceding step-length once set；Stepping electricity is driven by stepper motor driving circuit 72
Machine 71 covers the step motion scope set again, is examined according to the picture signal received from image capture module 5 and from position
The position detection signal that sensor 73 receives is surveyed, calculates the image focus criteria function in each focusing position of infrared lens
Value, and the maximum image focus criteria function value in the range of the step motion set again by comparing and its corresponding step
Enter position；
Step 3, repeat above-mentioned step two and reach n times, N is more than or equal to 0, and this corrects image planes drift control automatically
Controller 74 by comparing to obtain a maximum image focus criteria function value in all step motion scopes, and control
Stepper motor 71 drives infrared lens 1 to be moved to and the maximum image focus criteria function value phase in all step motion scopes
Corresponding focusing position.
The method of above-mentioned correction image planes drift is based on a kind of ramping constraint of optimization, and the algorithm is first drawn
The maximum of the whole stroke interior focusing evaluation function value of infrared lens, then reduce hunting zone, search precision is improved, most
Big value nearby re-searches for, and this process is repeated, until obtaining the search value of full accuracy.Its principle is as shown in Figure 3.
In a specific embodiment, it is somebody's turn to do the infrared imaging evidence-obtaining system based on acousto-optic tunable filter and corrects picture
The method of face drift comprises the following steps：
A, step motion range L=[a, the b] of stepper motor 71 is set, step-length λ, a, b are respectively rising for stepper motor
Point stepping position and terminal stepping position；Make λ=(b a)/5；
B, using a as starting point, its focusing evaluation as the image of the whole L/λ focusing positions of step-length collection and is calculated using λ
Functional value；
C, compare L/λ focus criteria function value, record the stepping position corresponding with the focus criteria function value of maximum
It is set to xth station；
D, returned by step-length of λ（x-1 ）Stand；
E, make the step motion range L of stepper motor 71=[（x-1）Stand,（x+1）Stand], λ=(b a)/10；
F, with（x-1）Stand as starting point, by λ=(b a)/10 be whole L/λ of step-length collection focus positions image and in terms of
Calculate its focus criteria function value；
G, compare L/λ focus criteria function value, record the stepping position corresponding with the focus criteria function value of maximum
It is set to the station of xth 1；
H, returned with λ=(b a)/10 for step-length（x1-1 ）Stand；
I, make the step motion range L of stepper motor 71=[（x1-1）Stand,（x1+1）Stand], λ=(b a)/30；
J, with（x1-1）Stand as starting point, with λ=(b a)/30 be whole L/λ of step-length collection focus positions image simultaneously
Calculate its focus criteria function value；
K, compare L/λ focus criteria function value, when focus criteria function value declines, return to three stepping fortune
Maximum focus criteria function value in dynamic scope, and control stepper motor 71 to drive infrared lens 1 to be moved to and three steppings
The corresponding focusing position of maximum image focus criteria function value in range of movement, so as to complete to focus.
Claims (5)
1. the infrared imaging evidence-obtaining system based on acousto-optic tunable filter, it is characterised in that：Including infrared lens, infrared sound
Optic tunable filter, Infrared imaging cameras, acousto-optic tunable filter driver, image capture module, computer and automatic
Correct image planes drift control；
Described Infrared Acousto-optical Tunable Filter is located at after described infrared lens, and the Infrared imaging cameras is positioned at infrared
After acousto-optic tunable filter, described image acquisition module is used for the picture signal for gathering Infrared imaging cameras output, and will
The picture signal of collection is sent to described computer, the first interface of computer and the acousto-optic tunable filter driver
Input connection, the output end of acousto-optic tunable filter driver and the signal input part of Infrared Acousto-optical Tunable Filter
Connection；
The automatic correction image planes drift control includes being used for stepper motor, the stepping electricity for focusing to the infrared lens
Drive circuit, for detect the infrared lens focusing position position-detection sensor and controller；The control
First signal input part of device is connected with the second interface of the computer, secondary signal input and the position of controller
The signal output part connection of detection sensor, the control output end of controller and the input phase of the stepper motor driving circuit
Even, the output end of stepper motor driving circuit is connected with stepper motor；
Described controller includes：
Picture signal receiving unit, for the picture signal collected by computer reception described image acquisition module；
Letter is detected in position detection signal receiving unit, the lens focusing position for receiving the position-detection sensor output
Number；
Drive control unit, for passing through described stepper motor driving circuit Driving Stepping Motor；
Focusing control unit, for repeatedly setting the step motion scope and step-length of stepper motor, passes through the drive control list
First Driving Stepping Motor covers the step motion scope set every time, and the image received according to described image signal receiving unit is believed
Number and the position detection signal unit receive lens focusing position detection signal, calculate each focusing in infrared lens
The image focus criteria function value of position, and by comparing to obtain the maximum image focusing evaluation letter in the range of each step motion
Numerical value and its corresponding stepping position；Wherein, it is latter since the step motion scope and step-length of second of setting stepper motor
The starting point of secondary step motion scope is set in and the maximum image focus criteria function value phase in previous secondary stepping range of movement
The previous stepping position of corresponding stepping position, after the terminal of step motion scope once be set in and previous secondary step motion
In the range of the corresponding stepping position of maximum image focus criteria function value later stepping position, after the step-length that once sets
Less than the preceding step-length once set；After Driving Stepping Motor covers the step motion scope of all settings, focusing control is single
Member controls stepper motor by comparing to obtain a maximum image focus criteria function value in all step motion scopes
Infrared lens are driven to be moved to the focusing corresponding with the maximum image focus criteria function value in all step motion scopes
Position.
2. the infrared imaging evidence-obtaining system based on acousto-optic tunable filter as claimed in claim 1, it is characterised in that institute
What is stated is repeatedly at least 3 times.
3. the infrared imaging evidence-obtaining system based on acousto-optic tunable filter as claimed in claim 1, it is characterised in that institute
The Infrared imaging cameras stated is indium gallium arsenic area array CCD infrared image sensor.
4. the infrared imaging evidence-obtaining system based on acousto-optic tunable filter as claimed in claim 1, it is characterised in that institute
The position-detection sensor stated is grating scale.
5. the infrared imaging evidence-obtaining system correction image planes based on acousto-optic tunable filter are drifted about as claimed in claim 1
Method, it is characterised in that comprise the following steps：
Step 1: the controller of correction image planes drift control sets the step motion scope and step-length of stepper motor automatically,
The step motion scope is covered by stepper motor driving circuit Driving Stepping Motor, according to the figure received from image capture module
The position detection signal received as signal and from position-detection sensor, calculates the figure in each focusing position of infrared lens
As focus criteria function value, and by comparing to obtain maximum image focus criteria function value and its phase in the range of the step motion
The stepping position answered；
Step 2: then, the automatic controller for correcting image planes drift control sets the step motion model of stepper motor again
Enclose and step-length, the starting point of the step motion scope set again are set in and the maximum image tune in previous secondary stepping range of movement
The previous stepping position of the corresponding stepping position of burnt evaluation function value, the terminal of the step motion scope set again are set in
The later stepping position of the stepping position corresponding with the maximum image focus criteria function value in previous secondary stepping range of movement,
The step-length set again is less than the preceding step-length once set；This is covered again by stepper motor driving circuit Driving Stepping Motor
The step motion scope of setting, according to the picture signal received from image capture module and from position-detection sensor receive position
Detection signal is put, calculates the image focus criteria function value in each focusing position of infrared lens, and by comparing to obtain
Maximum image focus criteria function value and its corresponding stepping position in the range of the step motion set again；
Step 3, repeat above-mentioned step two and reach n times, N is more than or equal to 0, and this corrects the control of image planes drift control automatically
Device processed controls stepping electric by comparing to obtain a maximum image focus criteria function value in all step motion scopes
Machine drives infrared lens to be moved to the tune corresponding with the maximum image focus criteria function value in all step motion scopes
Burnt position.
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| CN107105200A (en) * | 2017-04-28 | 2017-08-29 | 陕西理工大学 | A kind of collecting image of computer system and its acquisition method for remotely showing |
| CN109471199A (en) * | 2018-12-13 | 2019-03-15 | 长春理工大学 | A kind of visible light and infrared multidimensional degree zoom polarization imaging material evidence hunting system |
| CN112464017B (en) * | 2021-01-27 | 2021-05-14 | 中国工程物理研究院流体物理研究所 | Infrared material evidence extractor, spectral feature library establishing method and utilization method |
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