CN106125246A - A kind of from the method seeking laser focal plane - Google Patents
A kind of from the method seeking laser focal plane Download PDFInfo
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- CN106125246A CN106125246A CN201610571184.6A CN201610571184A CN106125246A CN 106125246 A CN106125246 A CN 106125246A CN 201610571184 A CN201610571184 A CN 201610571184A CN 106125246 A CN106125246 A CN 106125246A
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- focus adjusting
- adjusting mechanism
- image
- motion command
- focal plane
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
The invention discloses a kind of from the method seeking laser focal plane, automatization's fast searching of focal plane during laser equipment uses.The present invention utilizes the feature that laser and image are confocal, compares the motor control with focus adjusting mechanism by image definition and finds quickly to realize focal plane.The evaluation methodology of image definition uses all directions based on sobel to edge detection operator, the motor control of focus adjusting mechanism uses the climbing method improved, the image definition of former and later two positions of focus adjusting mechanism is compared, determine the focus adjusting mechanism direction of motion and step sizes according to comparative result, judge whether that focusing terminates by the change frequency of the focus adjusting mechanism direction of motion.By using this method can quickly arrive laser focal plane, do special handling to moving to focus adjusting mechanism extreme position simultaneously, can realize focussing process does not constitutes damage to focussing mechanism.The inventive method has the features such as fast operation, precision height, strong interference immunity, good stability.
Description
Technical field
The invention belongs to laser equipment technology and technical field of image processing, burnt from seeking laser more particularly, to one
The method of plane.
Background technology
Along with laser technology and machine vision are increasingly widely applied at industry, scientific research field, both fusions become
For the important support of laser equipment Intelligent Process, in the camera equipment with confocal laser, how finding focal plane becomes product
The intelligentized key of product.
The searching that traditional laser equipment uses the mode of artificial perusal manual operation to realize focal plane, the method is subject to
Anthropic factor processed is relatively big, and precision is relatively low, and in the component processing of high-volume different model, is accomplished manually this if used
Business, for changing model parts every time, this by be one the most loaded down with trivial details, uninteresting, waste time and energy and the work that easily makes mistakes.
Summary of the invention
For the defect of prior art, it is an object of the invention to provide a kind of from the method seeking laser focal plane, its mesh
Be can fast automatic searching laser focal plane, work efficiency is high and ensure that reliability.
The invention provides a kind of from the method seeking laser focal plane, comprise the steps:
S1: focusing movements mechanism direction change frequency sets to 0；
S2: gather a frame initial position image；
S3: described initial position image is carried out gray processing, and image is carried out definition evaluation；
S4: send the motion command of N number of step-length that moves upward to focus adjusting mechanism；Focusing movements mechanism carry out status poll and
Command process also performs motion command；
S5: gather current position image；
S6: the current position image gathered is carried out gray processing, and image is carried out definition evaluation；
S7: forward and backward two two field pictures are carried out definition and compares, if definition strengthens, performs step S8, if definition subtracts
Weak then execution step S9；
S8: sending equidirectional same step-length motion command to focus adjusting mechanism, focusing movements mechanism carries out status poll and order
Process and perform motion command, and be back to step S5；
S9: judge focusing movements mechanism direction change frequency whether more than n, if less than then perform equal to n step S10,
S11, otherwise performs step S12；
S10: focusing movements mechanism direction change frequency adds 1；
S11: sending opposite direction half step-length motion command to focus adjusting mechanism, focusing movements mechanism carries out status poll and order
Process and perform motion command, and be back to step S5；
S12: focusing movements mechanism direction change frequency sets to 0；Focusing terminates.
Further, sobel is utilized from all directions to edge detection operator, image to carry out definition evaluation, described sobel
To edge detection operator it is from all directions:
Further, umber of pulse N value is depending on different motors, and the value of umber of pulse N is preferably 1000 to 1200.
Further, focusing movements mechanism carry out status poll and command process particularly as follows:
(1) focus adjusting mechanism motion command is received；
(2) judge whether it arrives upper and lower limit position by inquiry input port；
(3) if arriving the upper limit or lower position, then focus adjusting mechanism motion command is modified, then direction is set to
The contrary direction of direction of motion last time, and step-length takes advantage of 2；The most do not revise focus adjusting mechanism motion command；
(4) focusing movements mechanism performs corresponding sports order.
Further, n is 3.
The present invention utilizes the mode of image procossing to realize Automatic-searching focal plane, replaces human eye by CCD and carries out figure in real time
As gathering, replace human brain by computer and the definition of image is processed and judges, replace staff by motor simultaneously and enter
Row controls focus adjusting mechanism motion, and therefore the present invention has that definition judgment is accurate, simple to operate, automaticity advantages of higher,
Effectively eliminate the impression of anthropic factor, it is ensured that product reliability.
Accompanying drawing explanation
Fig. 1 is the system schematic that the present invention applies；
Fig. 2 is from the flow chart seeking laser focal plane in the present invention；
Fig. 3 is that in the present invention, focusing movements mechanism carries out status poll and command processing module flow chart.
Wherein, 1 is CCD, and 2 is computer, and 3 is display, and 4 is laser, and 5 is camera lens, and 6 is motion control card, and 7 is motion
Platform, 8 is motor, and 9 is drive circuit.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and
It is not used in the restriction present invention.
The technical problem to be solved be a kind of can the method for fast automatic searching laser focal plane, to improve
Work efficiency, and ensure reliability.
The present invention combines the feature that in confocal system, at laser focal plane, image definition is the highest, it is proposed that a kind of sharp from seeking
The method of light focal plane, comprises the steps:
(1) focusing movements mechanism direction change frequency sets to 0；
(2) image system is utilized to gather a frame initial position image；
(3) initial position image is carried out gray processing, utilize all directions of sobel to edge detection operator, image to be carried out clearly
Clear degree is evaluated；
(4) motion command of N number of step-length that moves upward is sent to focus adjusting mechanism；Focusing movements mechanism carry out status poll and
Command process also performs motion command；
(5) current (after motion) location drawing picture is gathered；
(6) collection image is carried out gray processing, utilize all directions of sobel, to edge detection operator, image is carried out definition
Evaluate；
(7) front and back two two field picture is carried out definition to compare, if definition strengthens, perform step (8), if definition subtracts
Weak, perform step (9).
(8) sending equidirectional same step-length motion command to focus adjusting mechanism, focusing movements mechanism carries out status poll and order
Process and perform motion command, repeated execution of steps (5)；
(9) judge focusing movements mechanism direction change frequency whether more than 3, if less than perform equal to 3 step (10),
(11) step (12), is otherwise performed；
(10) focusing movements mechanism direction change frequency adds 1；
(11) sending opposite direction half step-length motion command to focus adjusting mechanism, focusing movements mechanism carries out status poll and order
Process and perform motion command, repeated execution of steps (5)；
(12) focusing movements mechanism direction change frequency sets to 0；Focusing terminates.
Further, it is both needed to focusing motion is carried out shape after oriented focusing movements mechanism of institute sends motion command
State inquiry and command process can carry out order execution, and this can effectively realize being initiated at any position and focusing overall process in focusing
Middle motion reaches the limit of detection and the protection of position.
Further, employing has high-precision sobel all directions to edge detection operator as sharpness evaluation function.
At present laser equipment focusing generally manually regulates the height of work platforms, human eye Real Time Observation image clear
Clear degree determines whether to be in focal plane position, and which is affected relatively big by artificial subjective factor, can cause focal plane position
Inaccurate thus affect processing effect, the present invention utilizes the mode of image procossing to realize Automatic-searching focal plane, is replaced by CCD
Human eye carries out image acquisition in real time, replaces human brain by computer and processes the definition of image and judge, passes through simultaneously
Motor replaces staff and is controlled focus adjusting mechanism motion, and therefore the present invention has that definition judgment is accurate, simple to operate, automatization
Degree advantages of higher, effectively eliminates the impression of anthropic factor, it is ensured that product reliability, and the present invention can make for laser equipment
During with, automatization's fast searching of focal plane provides a kind of simple, solution of low cost, has the most economic effect
Benefit and social benefit.
The method certainly seeking laser focal plane provided for the further description embodiment of the present invention, in conjunction with accompanying drawing and
Details are as follows for instantiation:
Fig. 1 is the system schematic that the present invention applies, and this system includes: CCD1, computer 2, display 3, laser 4, mirror
5, motion control card 6, motion platform 7, motor 8 and drive circuit 9；Wherein, camera and confocal laser, CCD gathers image also
Passing to computer, computer utilizes the inventive method output corresponding control signal to drive motor and actuating device to adjust image system
The distance of middle zoom lens and object plane is with fast searching laser focal plane.Main working process is:
(1) CCD gathers a frame initial position image；
(2) image of collection is delivered to computer by RJ45 interface by CCD；
(3) the inventive method is utilized to calculate required motor control signal information after computer receives image information
(number of pulses and directional information) also passes to motion control card by USB interface；
(4) motion control card exports corresponding control signal to motor-drive circuit by the pattern in pulse+direction；
(5) motor-drive circuit control driven by motor motion platform moves, and wherein motor output shaft is by machinery even
Tape splicing moves motion platform and moves.
Accompanying drawing 2 is the flow chart certainly seeking laser focal plane in the present invention, as in figure 2 it is shown, the inventive method includes:
(1) focusing movements mechanism direction change frequency sets to 0；
(2) image system is utilized to gather a frame initial position image；
(3) initial position image carrying out gray processing, i.e. image and is converted into the process of gray scale by colour, gray processing uses
YUV process.Utilizing the degree of Gray step change at marginal point to carry out the definition of evaluation image, focusing function is
Wherein, (x y) represents that (x, gradient y) illustrate this point edge energy size at image midpoint to G.Gx, GyIt is respectively
(x, y) with the convolution of respective edges detective operators, represents horizontal edge and vertical edge to image each pixel grey scale f respectively
Graded.J i.e. definition evaluation of estimate, represents that its value is the biggest then represents image more to the gradient summation of each point in entire image
Clearly.
Edge detection operator uses noise inhibiting ability preferable, can accurately reflect image definition, and amount of calculation is placed in the middle
Sobel is from all directions to edge detection operator, as follows:
(4) motion command of N number of step-length that moves upward is sent to focus adjusting mechanism；Focusing movements mechanism carry out status poll and
Command process also performs motion command.Wherein moving step sizes N is depending on the parameter of electric machine and practical situation, in the method the taking of N
Value is 1000 to 1200 the most suitable.
(5) current (after motion) location drawing picture is gathered；
(6) collection image is carried out gray processing, utilize all directions of sobel, to edge detection operator, image is carried out definition
Evaluate；
(7) front and back two two field picture being carried out definition evaluation of estimate to compare, its value is the biggest then represents that image is the most clear, if clearly
Degree strengthens (a later frame is higher than previous frame image definition evaluation of estimate) and then performs step (8), if clearly not strengthening, (a later frame ratio is front
One two field picture definition evaluation of estimate is low or equal) then perform step (9)；
(8) sending and the last equidirectional same step-length motion command that moves to focus adjusting mechanism, focusing movements mechanism carries out shape
State inquiry and command process perform motion command, repeated execution of steps (5)；
(9) judge focusing movements mechanism direction change frequency whether more than 3, if less than perform equal to 3 step (10),
(11) step (12), is otherwise performed；
(10) focusing movements mechanism direction change frequency adds 1；
(11) opposite direction (contrary with direction of motion last time) half step-length motion command, focusing movements machine are sent to focus adjusting mechanism
Structure carries out status poll and command process and performs motion command, repeated execution of steps (5)；
(12) focusing movements mechanism direction change frequency sets to 0；Focusing terminates.
Accompanying drawing 3 carries out status poll and command processing module flow chart for focusing movements mechanism in the present invention, mainly exchanges
Burnt motion moves to extreme position and has done special handling, can realize focus adjusting mechanism and be initiated in any position and motor process
Arrive any position all can quickly arrive laser focal plane and focussing mechanism not constituted damage.
As it is shown on figure 3, comprise the steps of:
(1) focus adjusting mechanism motion command is received；
(2) focus adjusting mechanism upper and lower limit position has been respectively mounted contact switch, and switching signal is connected to control card input port,
By inquiry input port, it is judged that whether it arrives upper and lower limit position；
(3) if arriving the upper limit or lower position, then focus adjusting mechanism motion command is modified, by direction reversely (with
Last time, the direction of motion was contrary), step-length takes advantage of 2；The most do not revise focus adjusting mechanism motion command；
(4) focusing movements mechanism performs corresponding sports order.
The present invention utilizes the feature that laser and image are confocal, compares the motor control with focus adjusting mechanism by image definition
Quickly to realize focal plane searching.Wherein the evaluation methodology of image definition uses all directions based on sobel to calculate to rim detection
Son, the motor control of focus adjusting mechanism uses the climbing method improved, the image definition of former and later two positions of focus adjusting mechanism is carried out
Relatively, determine the focus adjusting mechanism direction of motion and step sizes according to comparative result, by the change of the focus adjusting mechanism direction of motion time
Number judges whether that focusing terminates.By using this method can quickly arrive laser focal plane, simultaneously to moving to focus adjusting mechanism pole
Extreme position has done special handling, can realize focussing mechanism not being constituted damage in focussing process.The inventive method has computing
The features such as speed is fast, precision is high, strong interference immunity, good stability.
As it will be easily appreciated by one skilled in the art that and the foregoing is only presently preferred embodiments of the present invention, not in order to
Limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, all should comprise
Within protection scope of the present invention.
Claims (5)
1. the method certainly seeking laser focal plane, it is characterised in that comprise the steps:
S1: focusing movements mechanism direction change frequency sets to 0；
S2: gather a frame initial position image；
S3: described initial position image is carried out gray processing, and image is carried out definition evaluation；
S4: send the motion command of N number of step-length that moves upward to focus adjusting mechanism；Focusing movements mechanism carries out status poll and order
Process and perform motion command；
S5: gather current position image；
S6: the current position image gathered is carried out gray processing, and image is carried out definition evaluation；
S7: forward and backward two two field pictures are carried out definition and compares, if definition strengthens, performs step S8, if definition weakens,
Perform step S9；
S8: sending equidirectional same step-length motion command to focus adjusting mechanism, focusing movements mechanism carries out status poll and command process
And perform motion command, and it is back to step S5；
S9: judge whether focusing movements mechanism direction change frequency is more than n, if less than then performing step S10, S11 equal to n,
Otherwise perform step S12；
S10: focusing movements mechanism direction change frequency adds 1；
S11: sending opposite direction half step-length motion command to focus adjusting mechanism, focusing movements mechanism carries out status poll and command process
And perform motion command, and it is back to step S5；
S12: focusing movements mechanism direction change frequency sets to 0；Focusing terminates.
2. the method for claim 1, it is characterised in that utilize sobel to edge detection operator, image to be carried out from all directions
Definition is evaluated, and described sobel to edge detection operator is from all directions:
3. method as claimed in claim 1 or 2, it is characterised in that the value of umber of pulse N is 1000 to 1200.
4. the method as described in any one of claim 1-3, it is characterised in that focusing movements mechanism carries out status poll and order
Process particularly as follows:
(1) focus adjusting mechanism motion command is received；
(2) judge whether it arrives upper and lower limit position by inquiry input port；
(3) if arriving the upper limit or lower position, then focus adjusting mechanism motion command is modified, then direction is set to and last time
The direction that the direction of motion is contrary, and step-length takes advantage of 2；The most do not revise focus adjusting mechanism motion command；
(4) focusing movements mechanism performs corresponding sports order.
5. the method as described in any one of claim 1-4, it is characterised in that n is 3.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106657777A (en) * | 2016-11-29 | 2017-05-10 | 武汉格物优信科技有限公司 | Automatic focusing method and system for infrared thermal imager |
| CN106769883A (en) * | 2016-12-29 | 2017-05-31 | 同济大学 | A kind of Schwarzschild focal plane of lens positioner and localization method |
| CN106773103A (en) * | 2016-11-25 | 2017-05-31 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of zoom lens focal plane position fast determination method |
| CN110238547A (en) * | 2019-05-09 | 2019-09-17 | 西安理工大学 | A system and method for measuring the focus position of high-power laser |
| CN111256589A (en) * | 2020-02-14 | 2020-06-09 | 长飞光纤光缆股份有限公司 | Image method size measurement compensation method and device based on frame loss detection |
| CN111612803A (en) * | 2020-04-30 | 2020-09-01 | 杭州电子科技大学 | A Semantic Segmentation Method of Vehicle Image Based on Image Clarity |
| CN115052139A (en) * | 2018-01-19 | 2022-09-13 | Pcms控股公司 | Multiple focal planes with varying positions |
| CN115488494A (en) * | 2021-06-18 | 2022-12-20 | 中国科学院上海光学精密机械研究所 | Method for confirming focus of ultrafast laser micro-nano processing platform |
| US12047552B2 (en) | 2018-07-05 | 2024-07-23 | Interdigital Vc Holdings, Inc. | Method and system for near-eye focal plane overlays for 3D perception of content on 2D displays |
| US12238270B2 (en) | 2018-03-23 | 2025-02-25 | Interdigital Vc Holdings, Inc. | Multifocal plane based method to produce stereoscopic viewpoints in a DIBR system (MFP-DIBR) |
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| CN106773103A (en) * | 2016-11-25 | 2017-05-31 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of zoom lens focal plane position fast determination method |
| CN106657777A (en) * | 2016-11-29 | 2017-05-10 | 武汉格物优信科技有限公司 | Automatic focusing method and system for infrared thermal imager |
| CN106769883A (en) * | 2016-12-29 | 2017-05-31 | 同济大学 | A kind of Schwarzschild focal plane of lens positioner and localization method |
| CN106769883B (en) * | 2016-12-29 | 2019-06-11 | 同济大学 | A Schwarzschild objective lens focal plane positioning device and positioning method |
| CN115052139A (en) * | 2018-01-19 | 2022-09-13 | Pcms控股公司 | Multiple focal planes with varying positions |
| US11893755B2 (en) | 2018-01-19 | 2024-02-06 | Interdigital Vc Holdings, Inc. | Multi-focal planes with varying positions |
| CN115052139B (en) * | 2018-01-19 | 2023-09-08 | 交互数字Vc控股公司 | Method for displaying video and display device |
| US12238270B2 (en) | 2018-03-23 | 2025-02-25 | Interdigital Vc Holdings, Inc. | Multifocal plane based method to produce stereoscopic viewpoints in a DIBR system (MFP-DIBR) |
| US12047552B2 (en) | 2018-07-05 | 2024-07-23 | Interdigital Vc Holdings, Inc. | Method and system for near-eye focal plane overlays for 3D perception of content on 2D displays |
| CN110238547B (en) * | 2019-05-09 | 2020-12-18 | 西安理工大学 | A system and measuring method for measuring high-power laser focus position |
| CN110238547A (en) * | 2019-05-09 | 2019-09-17 | 西安理工大学 | A system and method for measuring the focus position of high-power laser |
| CN111256589B (en) * | 2020-02-14 | 2020-12-01 | 长飞光纤光缆股份有限公司 | Image method size measurement compensation method and device based on frame loss detection |
| CN111256589A (en) * | 2020-02-14 | 2020-06-09 | 长飞光纤光缆股份有限公司 | Image method size measurement compensation method and device based on frame loss detection |
| CN111612803B (en) * | 2020-04-30 | 2023-10-17 | 杭州电子科技大学 | A semantic segmentation method for vehicle images based on image clarity |
| CN111612803A (en) * | 2020-04-30 | 2020-09-01 | 杭州电子科技大学 | A Semantic Segmentation Method of Vehicle Image Based on Image Clarity |
| CN115488494A (en) * | 2021-06-18 | 2022-12-20 | 中国科学院上海光学精密机械研究所 | Method for confirming focus of ultrafast laser micro-nano processing platform |
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Application publication date: 20161116 |