CN103425355B - The portable optical touch screen of a kind of omnidirectional camera structure and location calibration steps thereof - Google Patents
The portable optical touch screen of a kind of omnidirectional camera structure and location calibration steps thereof Download PDFInfo
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- CN103425355B CN103425355B CN201310284933.3A CN201310284933A CN103425355B CN 103425355 B CN103425355 B CN 103425355B CN 201310284933 A CN201310284933 A CN 201310284933A CN 103425355 B CN103425355 B CN 103425355B
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Abstract
The present invention provides portable optical touch screen and the location calibration steps thereof of a kind of omnidirectional camera structure, and this touch-screen includes: image collecting device, for gathering the image above touch-surface；Infrared light supply: for band in touching object, to be caught by image collecting device, or irradiate touching object, make touching object reflect infrared light, to be caught by image collecting device.Wherein image collecting device is a kind of infrared omnidirectional camera, is made up of infrared camera, omnidirectional's camera lens, and infrared camera can see the image of around 360 degree by omnidirectional's camera lens, and this touch-screen must comprise two or more image collecting device.The touch-screen that the present invention proposes effectively solves " ghost point " problem, supports multi-point touch, has cheap, portable, easy-to-use, easy care, easily extension, touches the advantages such as size adjustable.
Description
Technical field
The present invention relates to computer vision and human-computer interaction technology, the portable optics particularly to a kind of omnidirectional camera structure touches
Touch screen and location calibration steps thereof.
Background technology
Touch-screen has the most friendly Man Machine Interface intuitively than traditional input equipment, the most gradually substitutes tradition input and sets
Standby.
Traditional touch-screen includes electric capacity, electric resistance touch screen.Although electric resistance touch screen is cheap, but outer membrane is easily scratched
Causing touch-screen unavailable, sandwich construction can cause the biggest light loss.Capacitance plate is current most popular touch-screen, lacking of it
Point is: easily cause maloperation at wet weather；Can only touch with hand or special felt pen；It is susceptible to drift；Price
Costliness is not suitable for making large-area touch-screen.
The optical touch screen conventional touch screen that compares has the biggest advantage.As price increases, ten little with touching area increase
Divide cheap and easy care.Optic multipoint touch screen with surface as representative, sufficiently bulky and expensive.Infrared touch panel has
It is difficult to multiple point touching, shortcoming unstable under illumination condition.
Summary of the invention
Based on this, it is necessary to provide a kind of cheap, portable, easy-to-use, easy care, easily extension, support multiple spot, touching size can
The optical touch screen become.Further, it would be desirable to provide its localization method and calibration steps.
The technical solution used in the present invention is: the portable optical touch screen of a kind of omnidirectional camera structure, including:
Image collecting device: for gathering the image above touch-surface；
Infrared light supply: for band in touching object, to be caught by image collecting device, or irradiate touching object, make touch
Object reflection infrared light, to be caught by image collecting device；
Wherein image collecting device is a kind of infrared omnidirectional camera, is made up of infrared camera, omnidirectional's camera lens；This touch-screen must
Two or more image collecting device must be comprised.
Further, described omnidirectional's camera lens is to be constructed by plane cylindrical projection (Flat Cylinder Percpective)
Optical lens, the optical axis of infrared camera overlaps with the central shaft of omnidirectional's camera lens, and infrared camera can be obtained by omnidirectional's camera lens
The annular picture of 360 degree of visual fields around image collecting device.
The present invention also provides for the localization method of the portable optical touch screen of omnidirectional's camera structure, and this localization method comprises following step
Rapid:
Obtain the image of image acquisition device, and image is processed, obtain all touches that this harvester captures
The coordinate of the barycenter of subject image；
According to these coordinates, calculate through this image collecting device center and the linear equation of touching object, finally give one directly
Line set；
Multiple image collecting devices, through above-mentioned two-step pretreatment, form multiple straight line set, take two straight line set, can be set to
A and B, then the straight line in A intersects two-by-two with the straight line in B and obtains a point set；
In the case of more than two image collecting device, multiple point set can be produced, take the common factor of these point sets, so can arrange
Except " ghost point ", obtain touch point set；
In the case of only two image collecting devices, according to screening out " ghost point " with examination algorithm and can get rid of, obtain
Touch point is gathered.
Further, described to image acquisition device to concretely comprising the following steps of processing of image:
A two field picture is obtained from image collecting device；
Use moving object recognizer, the pixel region in image is divided into the foreground pixel of motion and static background pixel, and
Generate corresponding bianry image；
Use regional connectivity algorithm, bianry image is carried out connection process, to mark off different touching object；
Calculate the coordinate of the barycenter of all touching object images captured.
The whole two field picture that image collecting device is not caught by described image procossing processes, but processes in image
Point pixel, this partial pixel be by touch-surface above light be mapped to infrared camera and formed through omnidirectional's camera lens is catadioptric,
The region at this partial pixel place be the center of circle of the annular picture arrived with image acquisition device as the center of circle, be half at a certain distance
Footpath, the doughnut with certain length as width is as detecting area, and length and width is the parameter needed for the method.
Additionally the present invention provides the calibration steps of portable optical touch screen of a kind of omnidirectional camera structure, each when this touch-screen
When individual image collecting device center coordinate in touch-surface coordinate system is the most known, calibration steps at least uses a calibration point i.e.
Can complete calibration, all calibration points are known at the coordinate of touch-surface；Exist when this touch-screen exists an image collecting device center
During coordinate the unknown in touch-surface coordinate system, calibration steps at least uses two calibration points and uses lubber-line, all calibration points
Known at the coordinate of touch-surface；Lubber-line is the line segment that touch-surface shows, an end points of lubber-line is fixed and is school
In on schedule one, another end points is movable, and user can control lubber-line and rotate, so that lubber-line depends on around its fixed endpoint
The secondary center running through each image collecting device.
Further, known when each image collecting device center coordinate in touch-surface coordinate system of this touch-screen
Time, this calibration steps comprises the following steps:
Touch-surface shows at least one calibration point, and to calibration algorithm provide calibration point coordinate in touch-surface coordinate system and
All image collecting device centers coordinate in touch-surface coordinate system；
User touches calibration point successively, after being caught by image collecting device, processes image, result is supplied to school
Quasi-algorithm；
Calibration algorithm utilizes geometrical relationship to be modified to parallel with touch-surface coordinate system by the default coordinate system of image processing apparatus
Coordinate system.
Further, when there is the coordinate the unknown in touch-surface coordinate system of an image collecting device in this touch-screen, this school
Quasi-method comprises the following steps:
Touch-surface display at least two calibration point, and provide calibration point coordinate in touch-surface coordinate system to calibration algorithm；
User touches calibration point successively, after being caught by image collecting device, processes image, result is supplied to school
Quasi-algorithm；
Touch-surface display lubber-line, user rotates lubber-line makes lubber-line sequentially pass through image collecting device center, will pass through every time
Two extreme coordinates of lubber-line when wearing image collecting device center are supplied to calibration algorithm；
Calibration algorithm utilizes geometrical relationship to be modified to parallel with touch-surface coordinate system by the default coordinate system of image processing apparatus
Coordinate system, and calculate image collecting device center coordinate in touch screen surface coordinate system.
Present invention advantage compared with prior art is:
1, this touch-screen is easy to carry, and whole equipment is light and takes up space little；In technology in the past, need on the touch surface
The parts such as cover glass, frame, had both reduced light transmittance, and had increased again touching device weight and volume, make touch-screen to carry；
2, this touch-screen is a kind of general autonomous device, and he does not binds with touch-surface, can be easily from a touch-surface
On take off and use on another touch-surface, owing to the sensing range size of this touch-screen can be adjusted by software, so
Going for the touch-surface of various sizes, it can be at lower cost by projection screen, display screen, wall, ground etc.
The surface not having touch function becomes can touch interface；In technology in the past, touch-screen and touch-surface one often, and
And the sensing range of touch-screen is fixing, therefore changes another touch-surface and be necessary for changing another touch-screen again；
3, this touch-screen is easy to use and installs, owing to image collecting device makes omnidirectional's harvester, as long as so in touch-screen
Image collector be seated in touch-surface institute in the plane, through calibration, this surface just can be by touch-control, at image
The angles and positions that reason device is placed, reequip without to original touch-surface；In technology in the past, the installation of touch-screen
Complexity, needs to reequip original touch-surface, and calibrates loaded down with trivial details；
4, this touch-screen is easy to safeguard, owing to several parts of touch-screen are separate removable part, so convenient dimension
Protecting replacing, in former technology, one part of touch-screen damages and generally requires all replacings；
5, this touch-screen can support multi-point touch from principle, and touch screens and infrared touch panel are supportive bad to multiple spot；
6, this touch-screen low cost, and low to manufacturing technique requirent, generate the cycle short, easily realize batch production；
7, the touch-control scope of this touch-screen can regulate on software；
8, this touch-screen can realize " suspension touch control " technology, i.e. touching object and need not contact touch-surface, it is possible to realize
Touch-control, the most this touch-screen is suitably applied in public arena, than other touch-screen health.
Accompanying drawing explanation
The plane cylindrical projection schematic diagram that Fig. 1 is followed by omnidirectional's camera lens；
Fig. 2 is a kind of possible omnidirectional's camera lens and the image collecting device of infrared camera composition；
Fig. 3 is a kind of possible omnidirectional's camera lens and the image collecting device of infrared camera composition；
Fig. 4 is for have employed a kind of Hemispheric panoramic imaging system (PAL) as the omnidirectional's camera lens in image collecting device；
Fig. 5 is in an embodiment, the schematic diagram that finger is caught by image collecting device；
Fig. 6 be image acquisition device to image in image detection district, coordinate system, the schematic diagram of motion pixel agglomerate；
Fig. 7 is that in an embodiment, the optical touch screen containing two image collecting devices is to the touching object with infrared light supply
Carry out the schematic diagram positioned；
Fig. 8 is in an embodiment, and not touching object with any device is positioned by the touch-screen containing active infrared light source
Schematic diagram；
Fig. 9 is in an embodiment, situation during optical touch screen multi-point touch containing two image collecting devices；
Figure 10 is in an embodiment, situation during optical touch screen multi-point touch containing more than two image collecting device；
Figure 11 is in an embodiment, before carrying out calibration algorithm, and the coordinate system of two image collecting devices and touch-surface
The situation of coordinate system；
Figure 12 is in an embodiment, carries out using the schematic diagram of lubber-line calibration；
Figure 13 is in an embodiment, carries out using the schematic diagram of lubber-line calibration；
Figure 14 is in an embodiment, after carrying out calibration algorithm, and the coordinate system of two image collecting devices and touch-surface
The situation of coordinate system；
Figure 15 is in an embodiment, when the position of image collecting device is fixed and be known, carries out the schematic diagram calibrated；
Figure 16 is in an embodiment, the handling process of graphics processing unit；
Figure 17 is in an embodiment, drives the handling process of processing unit.
Detailed description of the invention
The present invention provides the portable optical touch screen of a kind of omnidirectional camera structure, including image collecting device, is used for gathering tactile
Touch the image of surface；Infrared light supply: for band in touching object, to be caught by camera, or irradiate touching object,
Touching object is made to reflect infrared light, to be caught by camera.Wherein, described image collecting device is by infrared camera, complete
To the infrared omnidirectional camera of camera lens composition, infrared camera, omnidirectional's camera lens are individual components, can be with dismounting and change.Wherein,
Omnidirectional's camera lens is the optical lens constructed according to " plane cylindrical projection (Flat Cylinder Percpective) ".Tradition
Imaging device based on central projection method, be the mode in the eye-observation external world, also be the imaging mode of pinhole camera, in order to obtain
Obtain the panoramic picture of 360 °, need an infinitely-great image plane, be physically difficulty with.In order to overcome lacking of central projection method
Fall into, there has been proposed " plane cylindrical projection ", establish a kind of new throwing in three dimensions visual field and limited two-dimensional image plane
Shadow relation, will the three-dimensional cylinder region circle ring area by special Systems Projection to two dimensional surface.
Name the example of available omnidirectional's camera lens:
Simplest omnidirectional camera lens only has a surface of revolution speculum, and such as spherical reflector, camera is at curved reflector just
Top, the optical axis of cam lens overlaps with the rotary shaft of the curved surface of curved reflector, and now camera can pass through camber reflection
The panoramic picture of around 360 degree seen by mirror.
Certainly, omnidirectional's camera lens also can also have more complicated lens combination, such as multiple speculums, multiple speculum and the group of lens
Closing, these deformation are all contained in the range of this patent protection.
This touch-screen needs to use two or more image collecting device.
The localization method of this touch-screen is:
Obtain the image of image acquisition device, and image is processed, obtain all touches that this harvester captures
The coordinate of the barycenter of subject image；
According to these coordinates, calculate through this image collecting device center and the linear equation of touching object, finally give one directly
Line set；
Multiple image collecting devices, through above-mentioned two-step pretreatment, form multiple straight line set, take two straight line set, can be set to
A and B, then the straight line in A intersects two-by-two with the straight line in B and obtains a point set；
In the case of more than two image collecting device, multiple point set can be produced, take the common factor of these point sets, so can arrange
Except " ghost point ", obtain touch point set；
In the case of only two image collecting devices, according to screening out " ghost point " with examination algorithm and can get rid of, obtain
Touch point is gathered.
Wherein, the Processing Algorithm flow process of described image procossing is:
A two field picture is obtained from image collecting device；
Use moving object recognizer, the pixel region in image is divided into the foreground pixel of motion and static background pixel, and
Generate corresponding bianry image；
Use regional connectivity algorithm, bianry image is carried out connection process, to mark off different touching object；
The relevant informations such as the coordinate of the barycenter of all touching object images that calculating captures.
Wherein, described image processing algorithm not to camera catch whole two field picture process, before it is known that,
Three-dimensional visual field around image collecting device is mapped to the circle ring area of two dimensional image by omnidirectional's camera lens, and image processing algorithm is with this
The center of circle of circle ring area is the center of circle, is radius at a certain distance, and the doughnut with certain length as width is as detecting area, at image
Adjustment method only processes the image in image detection district, and the image in this image detection district is that the light on touch-surface is through omnidirectional
Camera lens is catadioptric to be mapped to camera and is formed, and camera can pass through above the image monitoring touch-surface in image detection district, with
Determine whether that touching object contacts touch-surface.
Wherein, described optical touch screen, in the case of not changing hardware, can be by regulating image detection region on software
Radius and width change the sensing range of image collecting device, thus change sensing range and the perception of whole optical touch screen
Thickness, perception thickness i.e. touching object be touched screen perception time can the maximum distance of off screen curtain.Touch can also be set in software
The size of screen.
Wherein said image processing program can run in special graphics processing unit, graphics processing unit and IMAQ
Device one_to_one corresponding, the calculating that all of graphics processing unit can be parallel, the quantity therefore increasing image collecting device will not be led
Cause touch-screen set feeler efficiency to decline too much.Other drivers of touch-screen may operate in driving processing unit, drives
Processing unit can be independent process chip, it is also possible to be computer CPU or other there is the chip of computing capability.
Wherein, infrared light supply can band in touching object, such as with the form band of finger ring on finger or on teacher's pointer, as
Passive infrared light source is caught by camera.Or as a kind of active light source, make infrared light spread all over whole touch-surface, tactile when having
When touching object proximity touch-surface, IR is reflected into infrared camera by touch objects cognition, to be captured, the most permissible
Realize so-called " naked hand touch-control ".
During as active light source, infrared light supply can be centered around around image collecting device, or a kind of independent device, only
It is the most permissible that infrared light to be made spreads all over touch-surface.
Wherein, described optical touch screen, can be independent, does not binds with touch-surface, and optical touch screen can be very convenient
Taking off from a touch-surface and use on another touch-surface, image collecting device can be placed on touch table when using
Face optional position in the plane, and image collecting device can arbitrarily angled place, as long as before the use, enables school
Quasi-algorithm, optical touch screen i.e. can normally use.
Additionally, it is provided that the calibration steps of this touch-screen a kind of:
When each image collecting device center coordinate in touch-surface coordinate system of this touch-screen is known, this calibration side
Method comprises the following steps: touch-surface shows at least one calibration point, and provides calibration point at touch-surface coordinate to calibration algorithm
Coordinate and all image collecting device centers coordinate in touch-surface coordinate system in system；User touches calibration point, quilt successively
After image collecting device catches, image is processed, result is supplied to calibration algorithm；Calibration algorithm utilizes geometry to close
The default coordinate system of image processing apparatus is modified to the coordinate system that the coordinate system with touch-surface is paralleled by system.
When this touch-screen exists the coordinate the unknown in touch-surface coordinate system of an image collecting device, this calibration steps includes
Following steps: touch-surface display at least two calibration point, and provide calibration point in touch-surface coordinate system to calibration algorithm
Coordinate；User touches calibration point successively, after being caught by image collecting device, processes image, result is supplied to
Calibration algorithm；Touch-surface display lubber-line, user rotates lubber-line makes lubber-line sequentially pass through image collecting device center, will
Two extreme coordinates of lubber-line when every time running through image collecting device center are supplied to calibration algorithm；Calibration algorithm utilizes geometry to close
The default coordinate system of image processing apparatus is modified to the coordinate system that the coordinate system with touch-surface is paralleled by system, and calculates image
Harvester center coordinate in touch screen surface coordinate system.
The present invention is further illustrated below in conjunction with the accompanying drawings with specific embodiment.
Fig. 1 shows the plane cylindrical projection that omnidirectional's camera lens is followed, i.e. in three dimensions visual field and limited two-dimensional image plane
Establish a kind of new projection relation, three-dimensional cylinder region is projected to by omnidirectional's camera lens the circle ring area of two dimensional surface, obtains
The annular picture of 360 degree of visual fields around image collecting device.
Fig. 2, Fig. 3, Fig. 4 show optical texture and the index path of three kinds of possible omnidirectional's camera lenses 12, they and infrared photography
11 have been combined into different image collecting devices.Other optical textures can certainly be used, but finally always meet plane
Around image collecting device 360 degree of panoramic pictures are mapped in an annular region of picture by cylindrical projection.In this patent
Being referred to as these optical textures is full shot.The optical axis of full shot will be with the optical axis coincidence of infrared camera, i.e. full shot
Optical axis needs to be perpendicular to the sensitive chip of infrared camera.
In Fig. 6, the image detection district 61 in the image 6 that camera 11 is collected be with annular picture the center of circle as the center of circle, with
R is radius, the circle ring area with d as width, and camera 11 can touch table by the image monitoring in image detection district 61
Above face 5, to determine whether that touching object contacts touch-surface 5, r and d is the most adjustable.In Fig. 5, hand
After referring to be caught by image collecting device, the picture of finger can be in image detection district.Image processing algorithm is by image detection district 61
Pixel binaryzation after, sport foreground pixel agglomerate 62 for be identified as touching object by graphics processing unit, its center-of-mass coordinate
Can be sent to drive in processing unit 3 by graphics processing unit.
Only make use of the pixel in the image detection district 61 in image 6 due to image processing algorithm, therefore, camera 11 is permissible
Do specially treated, make it only return the image containing image detection district 61 pixel, increase the frame frequency of camera 11 with this.
This optical touch screen, can be in the case of not changing hardware, can be only by regulating image detection region 61 on software
Radius r and width d can change sensing range and the perception thickness of image collecting device.
In Fig. 7, Fig. 8,1-1,1-2 are image collecting device, and 2-1,2-2 are graphics processing unit, they and 1-1,1-2
The most corresponding, 2-1 processes the image of 1-1, and 2-2 processes the image of 1-2.Graphics processing unit can be incorporated into IMAQ
In the infrared camera of device.Drive processing unit 3 can connect 2-1,2-2, the wireless or side of wired connection can be used
Formula.
Fig. 7 shows how touch-screen is positioned by two image collecting devices 1-1,1-2, it may be seen that Fig. 7
Middle by infrared light supply 4 band in touching object, to be caught by figure harvester, this touching object can be finger, pen,
Teacher's pointer etc..
Fig. 8 shows another kind of situation, and infrared light supply 4 is arranged on around image collecting device, i.e. as active infrared light source,
Making infrared light spread all over whole touch-surface, when there being touching object close to touch-surface, IR is reflected into by touch objects cognition
Enter infrared camera, to be captured, so can realize so-called " naked hand touch-control ".
Situation in Fig. 8 is adapted for carrying out undersized touch-screen, because the power problem of infrared light supply, is not suitable for infrared
Light spreads all over bigger touch-surface.And in Fig. 7, infrared light supply is bundled in touching object, it is adapted for carrying out large-sized touch
Screen.
In Fig. 9, having two touching object P1 and P2 in touch-surface 5,1-1,1-2 capture two touching object,
Two touching object centroid position in the picture is passed to drive processing unit 3, at driving by graphics processing unit 2-1,2-2
Reason unit 3 calculated image collecting device center and the linear equation of touching object barycenter according to these information, here by 2-1
The information provided calculates straight line C1P1 and the equation of straight line C1P2,2-2 the information provided calculates straight line C2P1 with straight
The equation of line C2P2, these two groups of straight lines intersect respectively, calculate touch point P1, P2 and the position of " ghost point " P1', P2 ',
That is, in the case of having two image collecting devices, multiple spot touches simultaneously and can produce " ghost point ", touch point the most here
Have two kinds may P1, P2 or P1 ', P2'.Only comprise the touch-screen of two image processing apparatus, meeting in the case of multi-point touch
The problem " ghost point " occur, needs to go with particular algorithm to screen " ghost point " in this case as far as possible.Obtain more stable many
Point touch-control is accomplished by multiple image collecting device.
Figure 10 can be used to illustrate, this optical touch screen is how to utilize the image collecting device of more than two to get rid of " ghost point "
, 1-1,1-2,1-3 are 3 image collecting devices, drive processing unit 3 by graphics processing unit 2-1,2-2,2-3
Obtain 3 groups of linear equations after the information processing provided, two straight lines relevant with 1-1 to and relevant two straight line intersection of 1-2
Obtain the point set containing 4 points, two straight lines relevant with 1-2 to and relevant two straight line intersection of 1-3 obtain containing 4
The point set of point, the common factor taking the two point set is real touch point, is here P1, P2, and this embodies this optical touch
The screen good support to multiple point touching, and good extensibility.
Figure 11 shows before carrying out calibration algorithm, the coordinate system 02,03 of two image collecting devices and the coordinate of touch-surface
It it is the situation of 01.At this moment 3 coordinate systems are the most not parallel, and are unaware that in 02, the 03 i.e. image collecting device of coordinate origin
Heart coordinate in the coordinate system 01 of touch-surface, two necessary conditions that this optical touch screen can normally position are: all figures
As the coordinate system of harvester is parallel with touch-surface coordinate system；All image collecting device centers are at touch-surface coordinate system 01
In coordinate known.
Figure 11, Figure 12, Figure 13, Figure 14 show the whole flow process of calibration algorithm, first such as Figure 11, show at touch-surface
Show several calibration point, the quantity of calibration point otherwise less than 2, more calibration point can guarantee that the accuracy of calibration result.These are several
Individual calibration point coordinate under coordinate system 01 is known.User touches calibration point successively can complete this step calibration.
Next Figure 12, Figure 13 illustrate how to use lubber-line calibration, with a calibration point in all calibration points of previous step
For axle, demonstrating a lubber-line, user controls lubber-line and rotates, and makes lubber-line sequentially pass through in each image collecting device
The heart, can complete this step calibration.
Figure 14 is in an embodiment, carries out the situation after calibration algorithm, it can be seen that the coordinate of two image collecting devices
It is 02,03 parallel with the coordinate system 01 of touch-surface, and the initial point of O2, O3 coordinate in O1 is it is known that this optical touch
Screen is now calibrated complete, can normally start work.It will be seen from figure 6 that the image that image collecting device captures is in school
Coordinate system before standard be default coordinate be 63, the x-axis of 63 direction horizontal with image is parallel, and the y-axis of 63 is with image longitudinal
Direction is parallel, and the coordinate system 63 after calibration can rotate to an angle and become coordinate system 64.
Owing to using lubber-line calibration to need touch-surface to have display function, the lubber-line of dynamically rotation can be demonstrated.So,
When touch-screen applications is not when showing the touch-surface of function, need the another kind of calibration program shown in Figure 15.Before calibration,
Need the i.e. image collecting device center coordinate in the coordinate system 01 of touch-surface of 02,03 coordinate origin known.Uniquely
When one calibration point coordinate is it is known that calibrate, user's touch changes calibration point can complete calibration.Calibration illustrates with Figure 14 after terminating
Effect identical.
The non-detailed disclosure of the present invention partly belong to techniques known.
Although detailed description of the invention illustrative to the present invention is described above, in order to artisans understand that of this technology neck
Those skilled in the art, it should be apparent that the invention is not restricted to the scope of detailed description of the invention, are come by the present invention
Say, as long as various change limits and in the spirit and scope of the present invention that determine in appended claim, these changes be aobvious and
Being clear to, all utilize the innovation and creation of present inventive concept all at the row of protection.
Claims (1)
1. the calibration steps of the portable optical touch screen of omnidirectional's camera structure, it is characterised in that this calibration steps uses
Calibration point and use lubber-line；Lubber-line is the line segment that touch-surface shows, an end points of lubber-line is fixed, another
End points is movable, and user can control lubber-line and rotate around its fixed endpoint, makes lubber-line sequentially pass through each image collecting device
Center complete calibration；
When each image collecting device center coordinate in touch screen surface coordinate system of this touch-screen is known, this calibration
Method comprises the following steps:
Touch-surface shows at least one calibration point, and provides calibration point coordinate in touch screen surface coordinate system to calibration algorithm
With all image collecting device centers coordinate in touch screen surface coordinate system；
User touches calibration point successively, after being caught by image collecting device, processes image, result is supplied to school
Quasi-algorithm；
Calibration algorithm utilizes geometrical relationship to be modified to equal with touch screen surface coordinate system by the default coordinate system of image collecting device
The coordinate system of row；
When there is the coordinate the unknown in touch screen surface coordinate system of an image collecting device in this touch-screen, this calibration steps bag
Include following steps:
Touch-surface display at least two calibration point, and provide calibration point seat in touch screen surface coordinate system to calibration algorithm
Mark；
User touches calibration point successively, after being caught by image collecting device, processes image, result is supplied to school
Quasi-algorithm；
Touch-surface display lubber-line, user rotates lubber-line makes lubber-line sequentially pass through each image collecting device center, every time
When running through image collecting device center, two extreme coordinates of lubber-line are supplied to calibration algorithm；
Calibration algorithm utilizes geometrical relationship to be modified to equal with touch screen surface coordinate system by the default coordinate system of image collecting device
The coordinate system of row, and calculate all image collecting device centers coordinate in touch screen surface coordinate system.
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| CN105931183A (en) * | 2016-04-15 | 2016-09-07 | 深圳乐行天下科技有限公司 | Omnibearing area array capturing system and device |
| CN106325613B (en) * | 2016-08-23 | 2020-06-05 | 昆山龙腾光电股份有限公司 | Touch display device and method thereof |
| CN113884080A (en) * | 2016-11-01 | 2022-01-04 | 北京墨土科技有限公司 | Method and equipment for determining three-dimensional coordinates of positioning point and photoelectric measuring instrument |
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