CN105094459B - A kind of optics multi-point touch locating method - Google Patents
A kind of optics multi-point touch locating method Download PDFInfo
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- CN105094459B CN105094459B CN201510121998.5A CN201510121998A CN105094459B CN 105094459 B CN105094459 B CN 105094459B CN 201510121998 A CN201510121998 A CN 201510121998A CN 105094459 B CN105094459 B CN 105094459B
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Abstract
The present invention discloses a kind of large scale multiple point touching positioning system based on more optical imageries, the method includes：Entire touch panel is divided by several regions according to optical camera property first, and each region is limited using three groups of angle combinations, the invalid combination " terrible point " of half or so when can effectively eliminate multiple point touching positioning by this region segmentation；Then according to the distance of each region distance optical imaging apparatus, each region area threshold value is set, partial touch " terrible point " is effectively eliminated by the way that the threshold value is arranged；Matched method is finally carried out with each optical device imaging angle using remaining each point and further eliminates possible touch point, and it can judge that each touch point is blocked in those optical devices by this matching, triangulation location is carried out so as to efficiently use the optical device not blocked.The present invention can be accurately positioned in the application of more optical device multiple point touchings, and can be effectively eliminated since multiple point touching and multiple spot imaging say " terrible point " problem introduced.
Description
Technical field
The present invention relates to optical touch control technology and human-computer interaction technique fields more particularly to multiple point touching to interact skill
Art.
Background technology
Fighter plane touch control technology keeps human-computer interaction more intuitive as a kind of novel computer input technology, by
In giving bringing great convenience property of user, other than being applied to portable personal information products, application field has spread information man
The every field such as electricity, public information, electronic game, business automation equipment.Common touch control technology includes capacitive touch
Technology, resistive touch technology, infrared touch technology or optical touch technology etc. are touched, wherein optical imagery multiple point touching interacts
Technology is always large scale interaction industrial hot spot technology, but the technology is by multiple point touching combination computation complexity high, " terrible point "
The limitation of problem and positioning accuracy, computation complexity directly influence the real-time response of equipment, and " terrible point " causes to generate when touching
False motion track, positioning accuracy directly influence touch effect, and exactly these reasons limit optical imagery multiple point touching
The extensive use of interaction technique.However have structure, installation and debugging simple based on optical multiple point touching technology, and it is at low cost, it touches
Size is touched without advantages such as limitations, there is huge potential market, so solving multiple point touching combination computation complexity height, eliminating
" terrible point " and it is accurately positioned the great meaning of true touch point.
Invention content
Goal of the invention：Present invention mainly solves multiple point touching combination computation complexities high, " terrible point " elimination and actual touch
Point is accurately positioned problem.
Scheme of the invention：The present invention is positioned using three optical cameras, and three optical cameras are respectively placed in Petting Area
The upper left corner in domain（A）, the upper right corner（C）And center of top（B）, see that Fig. 2, each optical camera are synchronized with 120 frames/second speed
Shooting, each touch point hot spot described in three optical camera A, B, C refers to imaging of the touch point in optical camera；The screening
Gear refers to that the hot spot of at least one touch point is blocked in the imaging of same optical camera by the hot spot of another touch point；It is described
" terrible point " refers to pseudo- touch point obtained from being calculated by related facula information faulty combination in three optical cameras, non-genuine to touch
It touches a little；The hot spot triangle area refers to by calculating each touch point facula information in three optical cameras, obtaining
The straight line intersected two-by-two to three groups then generates three intersection points, and hot spot triangle area refers to just three formed triangles of intersection point
The area of shape；These three intersecting point coordinates are identical in the ideal case, then it is a point to degenerate.
Invention key step：
Step 1：Touch interaction area subregion：By optical lens physical characteristic, the angular range captured by camera lens is carried out
Equalization divides；Fish eye lens A, C areas imaging positioned at the upper left corner, the upper right corner is 90 degree, is located at the flake mirror of center of top
Head B areas imagings are that B is divided into 6 equal portions, each region accounts for 30 degree, after subregion by 180 degree so A, C are divided into 3 equal portions
Touch interaction area such as Fig. 3, the angular range in each region is as follows：
Region 0：（π/3, pi/2,5 π/6, π, 5 π/6, π）；
Region 1：（π/6, π/3,5 π/6, π, 5 π/6, π）；
Region 2：（0, π/6,5 π/6, π, 5 π/6, π）；
Region 3：（0, π/6,0, π/6,5 π/6, π）；
Region 4：（0, π/6,0, π/6,2 π/3,5 π/6）；
Region 5：（0, π/6,0, π/6, pi/2,2 π/3）；
Region 6：（π/3, pi/2,2 π/3,5 π/6,5 π/6, π）；
Region 7：（π/6, π/3,2 π/3,5 π/6,5 π/6, π）；
Region 8：（0, π/6,2 π/3,5 π/6,5 π/6, π）；
Region 9：（0, π/6, pi/2,2 π/3,5 π/6, π）；
Region 10：（0, π/6, π/3, pi/2,5 π/6, π）；
Region 11：（0, π/6, π/6, π/3,5 π/6, π）；
Region 12：（0, π/6, π/6, π/3,2 π/3,5 π/6）；
Region 13：（0, π/6, π/6, π/3, pi/2,2 π/3）；
Region 14：（π/3, pi/2,2 π/3,5 π/6,2 π/3,5 π/6）；
Region 15：（π/6, π/3, pi/2,2 π/3,5 π/6, π）；
Region 16：（0, π/6, π/3, pi/2,2 π/3,5 π/6）；
Region 17：（π/6, π/3, π/6, π/3, pi/2,2 π/3）；
Region 18：（π/3, pi/2, pi/2,2 π/3,2 π/3,5 π/6）；
Region 19：（π/6, π/3, pi/2,2 π/3,2 π/3,5 π/6）；
Region 20：（π/6, π/3, π/3, pi/2,2 π/3,5 π/6）；
Region 21：（π/6, π/3, π/3, pi/2, pi/2,2 π/3）.
By subregion, it just can will touch that interaction area is complete to combine, and each region passes through three pairs of angle models
It encloses and is defined；If there are touch point p in region 9, then the touch point corresponds to hot spot and is respectively present in optical lens A, B, C
In following range：（0, π/6）,（Pi/2,2 π/3）,（5 π/6, π）, be combined be region 9 angle control range；
Further touch point p can limit p by combining as follows（）, whereinFor p and A angulations,
For p and B angulations,For p and C angulations.
Step 2 " terrible point " technology for eliminating
Through after step 1, there is its corresponding angle control range in the arbitrary touch point on touch area, we pass through
Three kinds of technologies eliminate " terrible point " below：
1. the angle control combination of pair each touch point judges whether in effective regional perspective range, if so,
Then retain；Otherwise it is judged to " terrible point ", and is rejected；
2. pair each region setting area threshold value calculates its hot spot triangle area to remaining each touch point, if its
Area value is less than given area area threshold, then retains；Otherwise it is judged to " terrible point ", and is rejected；
3. pair remaining each touch point, searches for corresponding angle value in three optical cameras, detects whether respectively
Identical value can be found, if can find same angular angle value in three optical cameras, is judged to " terrible point "；Otherwise it is judged to really touch
It touches a little.
Step 3：True touch point location technology
Judge that with the presence or absence of blocking, triangulation location is carried out if not blocking using A, C camera for the touch point；If hair
Life is blocked, then first judges have several optical lens to be blocked：If being only blocked there are one optical lens, remaining two are used
Optical lens carries out triangulation location；If two optical lens are blocked, further judge whether B optical lens is blocked, if B
It is not blocked, then triangulation location is calculated using B and A, C any combination；If B is blocked, three are being carried out using A, C optical lens
Angle positions.
Invention effect：
The current multiple point touching technology based on optical imagery mostly uses three cameras and realizes, using four optical imageries
There is also cost price is higher, and Processing Algorithm is increasingly complex, although in partial picture energy at present for the multiple point touching technology of equipment
" terrible point " and occlusion issue are solved, but can not be fully solved.Multiple point touching technology based on three optical imaging apparatus, it is main at present
Tracking is used to eliminate " terrible point " method, but there are computation complexity height, " terrible point " eradicating efficacy difference and actual touch for this method
The problems such as positioning accuracy is low, the present invention are based on these problems and propose new solution.The present invention will touch hand over first
Mutual region carries out subregion according to optical imaging apparatus characteristic, and each effective touch area is defined with angle control range, to
It can effectively reduce to combine in multiple point touching and calculate, effectively rejecting can not possibly existing number of combinations；Three steps " ghost is used again
Point " removing method effectively rejects obtained from being calculated because of combination " terrible point ", and then improves system stability；Finally judge light
It learns camera lens to be blocked situation, according to the concrete condition that each optical lens is blocked, using different triangulation location methods, to carry
High actual touch spot placement accuracy.The measured result of the present invention shows：The algorithm of exploitation can effectively reduce combination and calculate complexity
Degree improves system and responds real-time；Combination can be effectively eliminated and calculate " terrible point ", ensure system run all right；To optical imagery
The judgement that camera lens blocks can significantly improve touch positioning accuracy.
Description of the drawings：
The following further describes the present invention with reference to the drawings：
Fig. 1 is system execution flow chart；
Fig. 2 is to touch interactive device structure chart；
Fig. 3 is touch point hot spot schematic diagram；
Fig. 4 is to touch interaction area subregion schematic diagram；
Fig. 5 is " terrible point " schematic diagram；
Fig. 6 is that right camera is blocked schematic diagram；
Fig. 7 is three touch points while touching light path schematic diagram；
Fig. 8 is that touch point corresponds to light spot image schematic diagram in optical lens in Fig. 7.
Specific implementation mode
One embodiment of the present of invention is described further below in conjunction with the accompanying drawings：
The embodiment of the present invention is implemented on following hardware device, and the present embodiment is only an example of the invention, to this
Invention does not generate any restriction effect, and any hardware configuration and software algorithm without essence modification are all in protection scope of the present invention
It is interior.This example is positioned using three optical cameras, and three optical cameras are respectively placed in the upper left corner of touch area（A）,
The upper right corner（C）And center of top（B）, see that Fig. 2, each optical camera synchronize shooting, each touch point with 120 frames/second speed
Corresponding hot spot is respectively formed in three optical camera A, B, C, screen resolution is that 1920 × 1080. cameras obtain light
Optical imagery is input in computer through USB after spot, carries out denoising, distortion correction to obtaining light spot image in a computer,
Then touch point location is carried out using the developed algorithm of the present invention, touch is shown on touch panel eventually by display program
Point.If there are three touch point a, b, c simultaneously touch on touch panel, as shown in fig. 6, Fig. 7 be its in each optical camera
Corresponding light spot image is respectively a by can be calculated a, b, c angulation in optical camera A, B, C（）,b（）,c（）, 18 can be obtained altogether by combining to calculate
Kind combination, this available 27 kinds of combination, but due to, there are touch point circumstance of occlusion, number of combinations being caused to decline in B cameras.Through with
Effective coverage combinations matches can further eliminate invalid number of combinations, finally obtain 10 kinds of combinations, finally obtained efficient combination
It is as follows：
Combination 1：（）；
Combination 2：（）；
Combination 3：（）；
Combination 4：（）；
Combination 5：（）；
Combination 6：（）；
Combination 7：（）；
Combination 8：（）；
Combination 9：（）；
Combination 10：（）；
These combinations are located in region 7,15,21,8,13,9,11,12,13,14.It can be concluded that, with tactile
Touch increasing for points, invalid combination number also increases therewith, in the case that unobstructed, use zone method can effectively reject half with
On invalid combination, to which computation complexity directly reduced half.Obviously, there is false combination in remaining combination, just
It is the presence of these falseness combinations, introduces so-called " terrible point ", part ghost can be further eliminated using region area threshold method
Point.The setting of region area threshold value and imaging device precision, touch point and imaging device distance, touch point and camera lens optical axis institute at
Corner dimension is related, and each region threshold setting is as follows in the present embodiment：
Region 0：800 regions 1：800 regions 2：800
Region 3：800 regions 4：800 regions 5：800
Region 6：200 regions 7：300 regions 8：200
Region 9：200 regions 10：200 regions 11：200
Region 12：100 regions 13：500 regions 14：200
Region 15：100 regions 16：100 regions 17：1000
Region 18：100 regions 19：100 regions 20：100
Region 21：500
It is final to reject 6 groups of falseness combinations by area threshold method, it is combined in residue 4, these four combinations are respectively：
Combination 1：（）；
Combination 3：（）；
Combination 5：（）；
Combination 10：（）.
These four combinations correspond to and 4 points of a, b, c, d in Fig. 6 respectively.It is described below and further eliminates " terrible point " method：?
Global search is carried out in remaining combination, and judges the value of counter C, if C=3, shows that current search point is " terrible point ",
If C=2 or C=1, show that it is true touch point, but or blocked by other true touch points, or blocked by " terrible point ",
If C=0, show that the point is true touch point, and be not blocked.Example：If examining whether a is " terrible point ", initialization counter
C = 0；Examine first other touch points in camera A angulation whether be, C=C+1 if having exits and works as
Preceding cycle；Otherwise C is constant, continues search for, until all combinatorial search are completed；Next detects other touch points in camera
In B angulation whether be, execute same flow；Finally detect other touch points in camera C angulation whether
For, execute same flow；If last C=3, show that a is " terrible point ", otherwise a is true touch point.To b, c, d point
Same global search is carried out, search result is as follows：
a: C = 1；
b: C = 2；
c: C = 2；
d: C = 3。
It is possible thereby to judge d for " terrible point ", a, b, c are true touch point.But still it can not determine the feelings that are blocked in a, b, c
Condition.After rejecting " terrible point " c, same global search is carried out again, is obtained：
a: C = 0；
b: C = 1；
c: C = 1；
It understands that touch point a is not blocked, upper left corner camera A and upper right corner camera C can be used and carry out triangulation location；b
It is blocked in a camera with c, by analysis data it is found that b and c is mutually blocked in camera C simultaneously, belongs to one
A camera is blocked situation；So camera A and B, which may be used, carries out triangulation location.By surveying, what the present invention was developed
Algorithm can effectively reduce combination computation complexity, improve system operation real-time, " terrible point " can be effectively rejected, to ensure system
Operation stability, the judgement to camera lens circumstance of occlusion, further improves positioning accuracy.It states again, the present embodiment is only pair
The simple application citing of the present invention, any algorithm without essence modification belong to the row of institute's protection domain of the present invention.
Claims (5)
1. a kind of camera type touch device localization method, by be placed on top two corners and intermediate fish-eye camera shooting at
Picture, imaging region are limited on touch panel, and coordinate position of the touch point on touch panel is positioned by image, special
Sign is：Specific steps include：
(1) according to the imaging property of fish-eye camera, region division is carried out to touch panel；
(2) according to touch point in each region at a distance from fish-eye camera and touch point with fish-eye camera camera lens optical axis institute at folder
Angle determines the area threshold of each region touch point, and the terrible point in part is eliminated according to area threshold；
(3) angle number for being left each touch point in corresponding camera is calculated, and is further disappeared according to the number of the same angular number of degrees
Except existing terrible point；
(4) according to the angle combinations in camera of remaining true touch point, each true touch point is calculated on touch panel
Coordinate position, touch independent positioning method be：
(4.1) value that counter is corresponded to according to each point, judges the circumstance of occlusion of each point；
(4.2) if counter is 0, show that the point is not blocked, then use the camera of two corners to be positioned；
(4.3) if counter is 1, show that this o'clock is blocked in a camera, then using two cameras not blocking into
Row positioning；
(4.4) if counter is 2, show that this o'clock is blocked in two cameras, then using the point not being blocked and any screening
The camera of gear is positioned.
2. camera type touch device localization method according to claim 1, it is characterised in that：In the step (1), to touching
Touch panel zone division the specific steps are：
(1.1) the first camera is divided into three angular ranges, each angular range is (0, π/6) (0, π/6), (π/6, π/3)
(π/6, π/3), (π/3, pi/2) (π/3, pi/2)；
(1.2) second camera is divided into six angular ranges, each angular range is (0, π/6) (0, π/6), (π/6, π/3)
(π/6, π/3), (π/3, pi/2) (π/3, pi/2), (pi/2,2 π/3) (pi/2,2 π/3), (2 π/3,5 π/6) (2 π/3,5 π/6), (5 π/
6, π) (5 π/6, π)；
(1.3) third camera being divided into three angular ranges, each angular range is (pi/2,2 π/3) (pi/2,2 π/3), (2 π/
3,5 π/6) (2 π/3,5 π/6), (5 π/6, π) (5 π/6, π)；
(1.4) it is 22 regions by each camera angle segmentation Image Segmentation Methods Based on Features by touch panel whole region, each region is with three pairs
Angular range controls, and an angular regions of the first camera, second camera and third camera are corresponded respectively to per a pair.
3. camera type touch device localization method according to claim 1, it is characterised in that：In the step (2), each area
The area threshold setting in domain is as follows：Region 0：800, region 1：800, region 2：800, region 3：800, region 4：800, region 5：
800, region 6：200, region 7：300, region 8：200, region 9：200, region 10：200, region 11：200, region 12：100,
Region 13：500, region 14：200, region 15：100, region 16：100, region 17：1000, region 18：100, region 19：
100, region 20：100, region 21：500.
4. camera type touch device localization method according to claim 1, it is characterised in that：In the step (2), eliminate
Terrible point methods are：
(2.1) angle combinations of point to be determined are judged, so that it is determined that it is in which region；
(2.2) imaging angle according to touch point in three cameras generates three straight lines, then three straight lines are all by touching
Point；
(2.3) judge the coordinate that three straight lines intersect two-by-two, obtain three coordinate points, and calculate according to these three coordinate positions
The area of its triangle formed；
(2.4) threshold value for comparing the area and the region if less than thinking that the touch point is terrible point if threshold value, and is eliminated, otherwise,
Retain.
5. camera type touch device localization method according to claim 1, it is characterised in that：In the step (3), eliminate
Ghost point method be：
(3.1) an empty counter is set；
(3.2) angle value consistent with point to be determined is searched on three cameras respectively, counter adds one if finding；
(3.3) judge the value of counter, if counter is equal to three, this can determine whether that point to be determined is terrible point, otherwise, be touched to be formal
Point.
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| CN201510121998.5A CN105094459B (en) | 2015-03-20 | 2015-03-20 | A kind of optics multi-point touch locating method |
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| CN108536037B (en) * | 2018-07-12 | 2023-08-11 | 四川虹美智能科技有限公司 | Control equipment and method of intelligent household appliance and intelligent household appliance |
| CN110275645B (en) * | 2019-06-12 | 2022-08-05 | 青岛海信商用显示股份有限公司 | Touch point identification method, touch point identification device, storage medium and touch device |
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| CN101697105A (en) * | 2009-10-26 | 2010-04-21 | 广东威创视讯科技股份有限公司 | Camera type touch detection positioning method and camera type touch detection system |
| CN102419662A (en) * | 2011-06-13 | 2012-04-18 | 北京汇冠新技术股份有限公司 | Multipoint identification method and system for infrared touch screen |
| CN102662532A (en) * | 2012-03-29 | 2012-09-12 | 广东威创视讯科技股份有限公司 | Multipoint touch coordinates positioning method and device |
| CN103399674A (en) * | 2013-08-01 | 2013-11-20 | 广东威创视讯科技股份有限公司 | Method and device of multi-point touch detection |
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Patent Citations (4)
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|---|---|---|---|---|
| CN101697105A (en) * | 2009-10-26 | 2010-04-21 | 广东威创视讯科技股份有限公司 | Camera type touch detection positioning method and camera type touch detection system |
| CN102419662A (en) * | 2011-06-13 | 2012-04-18 | 北京汇冠新技术股份有限公司 | Multipoint identification method and system for infrared touch screen |
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