CN104935919B - A kind of light path monitoring method based on light-field camera - Google Patents
A kind of light path monitoring method based on light-field camera Download PDFInfo
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- CN104935919B CN104935919B CN201510323214.7A CN201510323214A CN104935919B CN 104935919 B CN104935919 B CN 104935919B CN 201510323214 A CN201510323214 A CN 201510323214A CN 104935919 B CN104935919 B CN 104935919B
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Abstract
The invention discloses a kind of light path monitoring method based on light-field camera, this method uses light path imaging of the light-field camera along optical system, judge that the reflecting surface of speculum whether there is between flaw and speculum and speculum light path with the presence or absence of bright spot by gathering and handling image information, at the same in the speculum and light path that can determine to have flaw bright spot position.The present invention is using the long depth field imaging of light-field camera, the characteristic of focusing and depth survey afterwards is monitored with carrying out total system to light path, the working condition of multiple speculums in light path can be monitored simultaneously in advance, afterwards or online, have the advantages that monitoring efficiency is high, easy to operate, so as to ensure that optical system normally smoothly works.
Description
Technical field
The present invention relates to a kind of monitoring method of optical system, more particularly to a kind of light path monitoring side based on light-field camera
Method, its be a kind of optical system between speculum and speculum and speculum light path monitoring method.
Background technology
In optical technical field, system intactly monitors the light path of optical system for ensureing that optical system is normal smoothly
Work meaning is great.In optical system, the reflecting surface that speculum in optical system is monitored in advance whether there is flaw, light path
Whether condition of work is met, potential problems can be removed starting optical system front row, optical system works are ensured.In optical system
During work, monitor the situation of light path on-line, the working condition of optical system can be recorded, while when some in light path
When optical element working condition changes and is unsatisfactory for condition of work and alarm, reduction damages the wind of optical element in light path
Danger.Monitoring light path can assess the working characteristics of optical system by contrasting state of the optical system before and after work afterwards.
In addition, whether the optical element in the optical system wrapped up for sealing or with casing, investigation light path can be normal
Work relative difficulty.Wasted time and energy, can only typically detected in advance or afterwards using artificial investigation method, it is difficult to realize online inspection
Survey, and manually investigate in laser system dangerous.Therefore, optical system is monitored along light path using camera can
To solve well in above mentioned problem.Patent of invention " one kind positioning reflection table of Chinese Patent Application No. 201410481855.1
The method of the speculum of face existing defects " is made camera focus successively in light path and reflected by constantly regulate general camera camera lens
The reflecting surface of mirror, to monitor the working condition of speculum.This method needs constantly to change camera parameter in monitoring process, with
The monitoring to different speculums in light path is met, so that being difficult to system intactly monitors light path.Light-field camera with its it is unique into
As pattern and image procossing mode can effectively overcome above mentioned problem.
Light-field camera can be achieved on long depth field imaging, the Novel camera of focusing and depth survey afterwards.In theory, light field
Camera can be with the working condition of whole light path in the monitoring optical system of system completely, while can determine there is the reflection of flaw
The position of mirror and quantity.
The content of the invention
The technical problem to be solved in the present invention is：In optical technical field, system intactly monitors the light path of optical system
For ensureing that the normal smoothly work meaning of optical system is great.In optical system, speculum in optical system is monitored in advance
Reflecting surface whether there is flaw, whether light path meet condition of work, can remove potential problems starting optical system front row,
Ensure optical system works.In optical system works, the situation of light path is monitored on-line, can be to the working condition of optical system
Recorded, while when some optical element working condition in light path changes and when being unsatisfactory for condition of work and Times
Alert, reduction damages the risk of optical element in light path.Monitoring light path can be by contrasting optical system before and after work afterwards
State, assesses the working characteristics of optical system.In addition, in the optical system wrapped up for sealing or with casing, investigation light path
Optical element whether can normal work relative difficulty.Wasted time and energy using artificial investigation method, typically can only in advance or thing
After detect, it is difficult to realize on-line checking, and manually investigate in laser system dangerous.
The invention solves the problems that the technical scheme that its technical problem is used is：A kind of light path monitoring side based on light-field camera
Method, this method uses light path imaging of the light-field camera along optical system, and speculum is judged by gathering and handling image information
Reflecting surface whether there is between flaw and speculum and speculum light path whether there is bright spot, while can determine there is the flaw
The position of bright spot in the speculum or light path of defect.This method can monitor multiple anti-in light path in advance, afterwards or online simultaneously
The working condition of mirror is penetrated, the method is characterized in that implementation step is as follows：
Step (1), the light path imaging using light-field camera along optical system.
Step (2), the camera lens for adjusting light-field camera, make its speculum in the middle part of light path of focusing, to ensure optical system
The reflecting surface of all speculums is all in the digital focusing range of light-field camera in middle light path.
Step (3), the image collected according to light-field camera judge in light path whether with the presence of speculum reflecting surface
Defect.
Step (4), the parameter according to light-field camera and its parallax relation to same objective point imaging calculate reflecting surface and deposited
Distance between the speculum and light-field camera camera lens of flaw, may thereby determine that specific position of the speculum in whole light path
Put.
Step (5), determine successively all reflecting surface existing defects speculum position, and determine its quantity.
Further, the speculum in the optical system includes total reflective mirror and half-reflecting half mirror.
Further, after the light-field camera is imaged for focus type light-field camera, i.e. object point by light-field camera primary mirror, its
Picture point is conjugated with sensitive chip on microlens array.
Further, primary mirror in the light-field camera, the putting position of microlens array need to meet same object point can be two
It is imaged on individual or more than two lenticules, to record parallax, so that according to disparity computation speculum and light-field camera mirror
The distance between head.
Further, in the step (4), the distance between speculum and camera lens be according to binocular range measurement principle and
Perfect lens Gaussian imaging equation utilize light-field camera in primary mirror and the parameter of microlens array and its to same objective point imaging
Parallax relation is calculated and obtained.
The present invention principle be：The present invention can realize that long depth field imaging, afterwards focusing and depth are surveyed using light-field camera
The characteristic of amount is monitored with carrying out total system to light path, can monitor multiple speculums in light path simultaneously in advance, afterwards or online
Working condition, while determine optical system in reflecting surface existing defects speculum position and quantity.
The present invention has the following advantages：The present invention is applied widely, and the anti-of speculum is determined by the image information collected
Reflective surface whether there is light path between flaw and speculum and speculum and whether there is bright spot, while can determine there is flaw
The position of bright spot in speculum or light path.This method can monitor multiple anti-in optical system in advance, afterwards or online simultaneously
The working condition of mirror is penetrated, the speculum of reflecting surface existing defects is found in time and its position in the optical path is determined, so as to timely
Take safeguard measure；The present invention has the advantages that real-time is good, monitoring efficiency is high, easy to operate, is that optical system is normally steady
Ground work provides safeguard.
Brief description of the drawings
Fig. 1 is basic flow sheet of the invention；
Fig. 2 is work system schematic diagram of the invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, illustrate with reference to the work system of the present invention
Figure, the present invention is described in more detail.
As shown in Figure 2, the work system of optical system is monitored by computer A, light-field camera B, light splitting with light-field camera
Mirror C, optical system D are constituted, it is assumed that wherein optical system D includes three speculums such as 1. number, 2. number and 3. number, and it is embodied
Method is as follows：
(1) auxiliary optical path is built using spectroscope C so that light path imagings of the light-field camera B along optical system D, and will
Image is delivered to computer A.
(2) adjustment light-field camera B camera lens, makes its 2. number speculum being located in optical system D in the middle part of light path of focusing,
To ensure in optical system D that all speculums are all in light-field camera B digital focusing range in light path.
(3) the reflecting surface existing defects for whether having speculum in light path are judged according to the light-field camera B images collected.
(4) the reflecting surface flaw in light path with the presence of speculum is assumed, according to light-field camera B parameter with it to same
The parallax relation of objective point imaging calculates reflecting surface and there is the distance between speculum and light-field camera camera lens of flaw, so that really
Surely it is 1. number, 2. number and 3. which or which speculum in number three speculums has flaw.
It is described above, it is only the embodiment in the present invention, but protection scope of the present invention is not limited thereto, and appoints
What be familiar with the people of the technology disclosed herein technical scope in, it will be appreciated that the conversion or replacement expected, should all cover
Within the protection domain of claims of the present invention.
Claims (1)
1. a kind of light path monitoring method based on light-field camera, this method using light path of the light-field camera along optical system into
Picture, judges that the reflecting surface of speculum whether there is between flaw and speculum and speculum by gathering and handling image information
Light path whether there is bright spot, at the same in the speculum and light path that can determine to have flaw bright spot position, this method can in advance,
It is afterwards or online while monitoring the working condition of multiple speculums in light path, it is characterised in that：This method realizes that step is as follows：
Step (1), the light path imaging using light-field camera along optical system；
Step (2), the camera lens for adjusting light-field camera, make its speculum in the middle part of light path of focusing, to ensure light in optical system
The reflecting surface of all speculums is all in the digital focusing range of light-field camera in road；
Step (3), the image collected according to light-field camera judge the reflecting surface existing defects for whether having speculum in light path；
Step (4), the parameter according to light-field camera and its parallax relation to same objective point imaging calculate reflecting surface and there is the flaw
The distance between speculum and light-field camera camera lens of defect, may thereby determine that particular location of the speculum in whole light path；
Step (5), determine successively all reflecting surface existing defects speculum position, and determine its quantity；
Speculum in optical system includes total reflective mirror and half-reflecting half mirror；
Light-field camera used in this method is its picture after focus type light-field camera, i.e. object point are imaged by light-field camera primary mirror
Point is conjugated with sensitive chip on microlens array；
In light-field camera used in this method primary mirror, the putting position of microlens array need to meet same object point can at two or
Be imaged on the more than two lenticules of person, to record parallax so that according to disparity computation speculum and light-field camera camera lens it
Between distance；
In step (4), the distance between speculum and camera lens are according to binocular range measurement principle and perfect lens Gauss imaging
Formula utilize light-field camera in primary mirror and the parameter of microlens array and its to same objective point imaging parallax relation calculating and obtain；
The light path monitoring method based on light-field camera can realize long depth field imaging, afterwards focusing and depth using light-field camera
The characteristic of measurement is monitored with carrying out total system to light path, can monitor multiple reflections in light path simultaneously in advance, afterwards or online
The working condition of mirror, while determining the position of the speculum of reflecting surface existing defects and quantity in optical system；
Specifically, with light-field camera monitor optical system work system by computer (A), light-field camera (B), spectroscope (C),
Optical system (D) is constituted, it is assumed that wherein optical system (D) includes 1. number, 2. number and 3. number three speculums, its specific embodiment party
Method is as follows：
(11) auxiliary optical path is built using spectroscope (C) so that light path imaging of the light-field camera (B) along optical system (D), and
Image is delivered to computer (A)；
(12) camera lens of adjustment light-field camera (B), makes its 2. number reflection being located in optical system (D) in the middle part of light path of focusing
Mirror, to ensure in optical system (D) that all speculums are all in the digital focusing range of light-field camera (B) in light path；
(13) image collected according to light-field camera (B) judges the reflecting surface existing defects for whether having speculum in light path；
(14) the reflecting surface flaw in light path with the presence of speculum is assumed, according to the parameter of light-field camera (B) with it to same
The parallax relation of objective point imaging calculates reflecting surface and there is the distance between speculum and light-field camera camera lens of flaw, so that really
Surely it is 1. number, 2. number and 3. which or which speculum in number three speculums has flaw.
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| CN106908016B (en) * | 2017-03-06 | 2019-07-05 | 中国科学院光电技术研究所 | A kind of concave surface hysteroscope curvature radius measurement method based on light-field camera |
| CN106954013B (en) * | 2017-04-19 | 2023-06-20 | 中国科学技术大学 | Compact high-resolution light field camera with double-light-path imaging |
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| CN104198501A (en) * | 2014-09-18 | 2014-12-10 | 中国科学院光电技术研究所 | Method for positioning reflector with flaw on reflecting surface |
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| CN104198501A (en) * | 2014-09-18 | 2014-12-10 | 中国科学院光电技术研究所 | Method for positioning reflector with flaw on reflecting surface |
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| 先拍照，后对焦——颠覆传统的光场相机Lytro;玉牙青青;《中国摄影家》;20130601;114-117页 * |
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