CN110084860A - A kind of projector lens distortion correction system and method - Google Patents
A kind of projector lens distortion correction system and method Download PDFInfo
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- CN110084860A CN110084860A CN201910439869.9A CN201910439869A CN110084860A CN 110084860 A CN110084860 A CN 110084860A CN 201910439869 A CN201910439869 A CN 201910439869A CN 110084860 A CN110084860 A CN 110084860A
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- G—PHYSICS
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/80—Analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration
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Abstract
The invention discloses a kind of projector lens distortion correction system and methods, including gridiron pattern scaling board, high definition camera, projector, curtain and computer, high definition camera is fixed on above projector, and the camera lens of high definition camera and projector is vertical with curtain and is located at same fore-and-aft plane, high definition camera is for shooting gridiron pattern picture, gridiron pattern picture passes through on projector to curtain, and the gridiron pattern picture of the projection on curtain is located in the visual field of high definition camera, high definition camera and projector are connect with the computer for calculating projector lens internal reference and distortion parameter.The present invention uses the combination for being the transformation on conventional camera lens plus software, have four big advantageous features: the precision of projected position and resolution ratio is higher, production cost is lower, volume is smaller, project ratio advantageously, it is higher to technology acuracy more to adapt to market economy, volume is smaller, cost is lower, projects closer demand.
Description
Technical field
The present invention relates to projector lens distortion correction technical field, especially a kind of projector lens distortion correction system
And method.
Background technique
Existing ultrashort zoom lens are that free-form curved mirror+more lens reflex mirror is composed currently on the market, are mostly
Reach same function superior technique infrastructure cost effect with multiple groups lens reflex or refraction, but its structure is complex, and structure is wanted
Refinement degree is higher, and lens set needs placement location different.The location error that will cause in projection is bigger.
Summary of the invention
The invention aims to solve the problems, such as in the prior art ultrashort zoom lens projector can not projection plane image, mention
For a kind of projector lens distortion correction system and method, make up that projector can not be imaged by introducing high definition camera is lacked
Point has equipment simple, at low cost, easy to operate, feature with high accuracy to complete the calibration of projector.
In order to achieve the above objectives, the present invention is implemented according to following technical scheme:
A kind of projector lens distortion correction system, including gridiron pattern scaling board, high definition camera, projector, curtain and meter
Calculation machine, the high definition camera are fixed on above projector, and the camera lens of high definition camera and projector is vertical with curtain and is located at same
One fore-and-aft plane, high definition camera pass through on projector to curtain for shooting gridiron pattern picture, the gridiron pattern picture, and
The gridiron pattern picture of projection on curtain is located in the visual field of high definition camera, and the high definition camera and projector are thrown with for calculating
Shadow instrument camera lens internal reference is connected with the computer of distortion parameter.
In addition, being distorted the present invention also provides a kind of projector lens distortion correction method using above-mentioned projector lens
Correction system, the specific steps are as follows:
S1, first with high definition camera shoot gridiron pattern picture, obtain high definition camera parameter P1；
S2, projector is then reused by gridiron pattern picture projector to curtain and using high definition camera capture curtain
Cloth gridiron pattern picture demarcates the picture that high definition camera captures, and get parms P2, and P2 is camera and projector lens
Internal reference and distortion parameter；It is finally calculated by computer and obtains projector lens internal reference and distortion parameter P3.
Further, the standardization of high definition camera parameter P1 is mainly designed according to the principle of camera pinhole imaging system in the S1,
Wherein it is as follows to be converted to pixel coordinate formula for world coordinate system:
Wherein s is ratio,For pixel coordinate, M1For high definition camera inner parameter matrix, M2To join outside high definition camera
Matrix number, XwHigh definition camera is solved during the calibration process according to known world coordinates and pixel coordinate for world coordinates
Internal reference matrix M1With outer ginseng matrix M2。
Further, get parms P2 specific steps in the S2 are as follows: the world of bodies coordinate is replaced with projector
Projection image, then establish its new calibration system of high definition camera+projector, when using projector picture, be conducive to new
Calibration system calibrates the internal reference and distortion parameter P2 of new camera and projector lens, the internal reference of camera and projector lens and
Distortion parameter P2 contains high definition camera parameter P1 and projector lens internal reference and distortion parameter P3, finally by Computing
High definition camera parameter P1 is rejected to obtain projector lens internal reference and distortion parameter P3.
Compared with prior art, the present invention is with being combination that transformation on conventional camera lens adds software, has four big excellent
Gesture feature: the precision of projected position and resolution ratio is higher, production cost is lower, volume is smaller, and projection ratio advantageously, more adapts to
Market economy is higher to technology acuracy, and volume is smaller, and cost is lower, projects closer demand:
1. projected position precision and high-resolution: the present invention is directly transformed by conventional camera lens, has been lacked since structure is missed
Projected position precision problem caused by difference has higher projected position precision than the reflective ultrashort coke on existing market, due to
It is directly to be made of lens set, and is the same in millions of pixel camera lens principles of regular camera, so can reaches very high
Resolution accuracy, production cost is lower.And what is used currently on the market is reflective principle, is unable to reach very high resolution
Rate precision.More lens reflex formulas are ultrashort burnt since production cost is excessively high currently on the market, can not promote always.Due to reflective super
Short focus is to reach to launch out bigger image in relatively short distance and come out with multiple groups lens reflecting.But what it is due to utilization is
Multiple groups lens reflecting, reflection is not the lens set on same horizontal line, and the inclination angle of the lens set of reflection seems very
Important, as soon as slightly point tolerance, the position projected after reflection has biggish deviation.
2. production cost is lower: since what the present invention used is made of conventional mirror often be transformed, so production with manufacture
Mature production technology and production cost are had in technique.And reflective ultrashort coke currently on the market, although also there is certain life
Production. art, but since structure is complicated, production required precision is higher, and production material cost is more higher.So.Cost of the invention
Very big cost advantage can be had more than the ultrashort zoom lens that reflect currently on the market, be a few minutes of reflection lens currently on the market
One of cost.
3. small in size: because use is conventional camera lens design principle to the present invention, and reflective ultrashort zoom lens are to tie
The principle reflected on structure, so reflective volume does not accomplish very little.So the present invention can be more anti-than currently on the market in volume
It is ultrashort burnt with more advantage small in size to penetrate formula.It is same to throw than much smaller times of volume of meeting.
4. projection is than advantageously: this is the projection ratio of various ultrashort cokes currently on the market, and the newest projection of the present invention
Than can achieve 0.25-0.28. than the following more advantage listed in the market.
Detailed description of the invention
Fig. 1 is projector lens distortion correction system structure diagram of the invention.
Fig. 2 is the flow chart of projector lens distortion correction method of the invention.
Fig. 3 is high definition camera imaging model of the invention.
Fig. 4 is high definition camera of the invention+projecting apparatus system imaging model.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, with reference to embodiments, to the present invention into
Row is further to be described in detail.Described herein the specific embodiments are only for explaining the present invention, is not used to limit invention.
As shown in Figure 1, present embodiments providing a kind of projector lens distortion correction system, including gridiron pattern scaling board
(being not drawn into figure), high definition camera 1, projector 2, curtain 3 and computer (being not drawn into figure), the high definition camera 1 are fixed on
2 top of projector, and the camera lens of high definition camera 1 and projector 2 is vertical with curtain 3 and is located at same fore-and-aft plane, high definition camera 1
For shooting gridiron pattern picture, the gridiron pattern picture projects to the view field 4 on curtain 3, and curtain 3 by projector 2
On the gridiron pattern picture of projection be located in the visual field of high definition camera 1, the high definition camera 1 and projector 2 are thrown with for calculating
Shadow instrument camera lens internal reference is connected with the computer of distortion parameter.
As shown in Fig. 2, projector lens distortion correction can be carried out using above-mentioned projector lens distortion correction system, have
Steps are as follows for body:
S1, first with high definition camera shoot gridiron pattern picture, obtain high definition camera parameter P1, specifically:
As shown in figure 3, the standardization of high definition camera parameter P1 is mainly designed according to the principle of camera pinhole imaging system, wherein generation
It is as follows that boundary's coordinate system is converted to pixel coordinate formula:
Wherein s is ratio,For pixel coordinate, M1For high definition camera inner parameter matrix, M2To join outside high definition camera
Matrix number, XwHigh definition camera is solved during the calibration process according to known world coordinates and pixel coordinate for world coordinates
Internal reference matrix M1With outer ginseng matrix M2。
S2, projector is then reused by gridiron pattern picture projector to curtain and using high definition camera capture curtain
Cloth gridiron pattern picture demarcates the picture that high definition camera captures, and get parms P2, and P2 is camera and projector lens
Internal reference and distortion parameter；It is finally calculated by computer and obtains projector lens internal reference and distortion parameter P3, specifically:
As shown in figure 4, the world of bodies coordinate to be replaced with to the projection image of projector, then its high definition camera 1+ is established
The new calibration system of projector 2 calibrates new camera and throwing conducive to new calibration system when using 2 projection image of projector
The internal reference and distortion parameter P2 of shadow instrument camera lens, the internal reference and distortion parameter P2 of camera and projector lens contain high definition camera ginseng
Number P1 and projector lens internal reference and distortion parameter P3 reject high definition camera parameter P1 finally by Computing to obtain
Projector lens internal reference and distortion parameter P3.
Before projection, the intrinsic parameter P3 of plane picture and projector is subjected to operation, obtains the image I with barrel-type distortion,
Distortionless flat image can be presented by ultrashort zoom lens projector projects in image I on curtain 3.
The limitation that technical solution of the present invention is not limited to the above specific embodiments, it is all to do according to the technique and scheme of the present invention
Technology deformation out, falls within the scope of protection of the present invention.
Claims (4)
1. a kind of projector lens distortion correction system, which is characterized in that including gridiron pattern scaling board, high definition camera, projector,
Curtain and computer, the high definition camera is fixed on above projector, and the camera lens of high definition camera and projector is vertical with curtain
And it is located at same fore-and-aft plane, for shooting gridiron pattern picture, the gridiron pattern picture is arrived high definition camera by projector
The gridiron pattern picture of projection on curtain, and on curtain is located in the visual field of high definition camera, the high definition camera and projector with
It is connected for calculating projector lens internal reference with the computer of distortion parameter.
2. a kind of projector lens distortion correction method, which is characterized in that abnormal using projector lens as described in claim 1
Become correction system, the specific steps are as follows:
S1, first with high definition camera shoot gridiron pattern picture, obtain high definition camera parameter P1；
S2, projector is then reused by gridiron pattern picture projector to curtain and using high definition camera capture curtain chess
Disk trrellis diagram piece demarcates the picture that high definition camera captures, and get parms P2, and P2 is the internal reference of camera and projector lens
And distortion parameter；It is finally calculated by computer and obtains projector lens internal reference and distortion parameter P3.
3. projector lens distortion correction method according to claim 2, it is characterised in that: high definition camera is joined in the S1
The standardization of number P1 is mainly designed according to the principle of camera pinhole imaging system, and wherein world coordinate system is converted to pixel coordinate formula such as
Under:
Wherein s is ratio,For pixel coordinate, M1For high definition camera inner parameter matrix, M2For high definition camera external parameter square
Battle array, XwThe internal reference of high definition camera is solved during the calibration process according to known world coordinates and pixel coordinate for world coordinates
Matrix M1With outer ginseng matrix M2。
4. projector lens distortion correction method according to claim 3, it is characterised in that: get parms P2 in the S2
Specific steps are as follows: the projection image that the world of bodies coordinate is replaced with to projector then establishes its high definition camera+projector
New calibration system calibrates new camera and projector lens conducive to new calibration system when using projector picture
The internal reference and distortion parameter P2 of internal reference and distortion parameter P2, camera and projector lens contain high definition camera parameter P1 and projection
Instrument camera lens internal reference and distortion parameter P3 reject high definition camera parameter P1 finally by Computing to obtain projector lens
Internal reference and distortion parameter P3.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112991457A (en) * | 2021-02-22 | 2021-06-18 | 北京理工大学 | Method and device for calibrating spatial position and internal and external parameters of projector in surgical navigation |
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