CN102945105B - A kind of multipoint portable optical touch screen and localization method thereof - Google Patents
A kind of multipoint portable optical touch screen and localization method thereof Download PDFInfo
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Abstract
The invention provides a kind of multipoint portable optical touch screen, comprising: image collecting device, for gathering the image above touch-surface; Picture processing chip, for the treatment of image, identifies touching object and calculates touching object relevant information; Processor, for calibrating touch-screen, processes the information that two or more picture processing chip provides, and calculates touch point, then touch point information is sent to upper computer software; Touch ring, be ring that can be luminous, under special circumstances, be enclosed within the top of finger or other touching object, improve touch quality; Frame is folding housing, and under special circumstances, the acquisition range of limited images harvester, prevents the moving object outside touch-surface from disturbing normal touch operation.Problem that the present invention effectively solves " terrible point ", has cheapness, portable, easy-to-use, easy care, the easily sensing range of expansion, touch-screen can regulate in software, can be applied to the advantages such as multiple occasion.
Description
Technical field
The present invention relates to computer vision and human-computer interaction technology, particularly a kind of multipoint portable optical touch screen and localization method thereof.
Background technology
Touch-screen has more friendly Man Machine Interface intuitively than traditional input equipment, therefore substitutes conventional input device just gradually.
Traditional touch-screen comprises electric capacity, electric resistance touch screen.Although electric resistance touch screen is cheap, outer membrane is easily scratched and causes touch-screen unavailable, and sandwich construction can cause very large light loss.Capacitance plate is current most popular touch-screen, and its shortcoming is: easily cause maloperation at wet weather; Can only touch with hand or special felt pen; Easily to drift about; Expensive being not suitable for makes large-area touch-screen.
The optical touch screen conventional touch screen that compares has very large advantage.Increase with touch area hardly as price and increase, very cheap and easy care.Take surface as the optic multipoint touch screen of representative, volume is very large and expensive.Infrared touch panel has and is difficult to realize multiple point touching, shortcoming unstable under illumination condition.
Summary of the invention
Based on this, be necessary to provide a kind of cheapness, portable, easy-to-use, easy care, the easy multiple spot optical touch screen expanded, touch size adjustable, multiple occasion can be applied to.Its localization method is provided in addition.
The technical solution used in the present invention is: a kind of multipoint portable optical touch screen, comprising:
Image collecting device, for gathering the image above touch-surface;
Picture processing chip, the image that process image acquisition device arrives, identifies touching object and calculates touching object relevant information;
Processor, for calibrating touch-screen, and processes the information that two or more picture processing chip provides, and calculates the information such as position, touch point, then touch point information is sent to upper computer software;
Touch ring, be ring that can be luminous, for when visible ray interference is large or light is dark, is enclosed within the top of finger or other touching object, improves touch quality;
Frame, for folding housing, when interference causing to touch-screen for the moving object outside touch-surface, touch-surface and image collecting device are fenced up, with the acquisition range of limited images harvester, prevent the moving object outside touch-surface from disturbing touch-screen.
Wherein, the omni-directional image harvester that described image collecting device is made up of camera, curved reflector and outer casing stand, camera, curved reflector, outer casing stand are individual components, can dismounting and change.
Wherein, the curved surface of described curved reflector is a kind of surface of revolution.
Wherein, camera and curved reflector are fixed together by outer casing stand, and camera is directly over curved reflector, and the position relationship of camera and curved reflector meets following requirement:
The optical axis of cam lens overlaps with the turning axle of the curved surface of curved reflector, and the picture centre that camera is captured is the center of curved reflector;
The height of camera will ensure that camera can capture the image of touch-surface upper peripheral 360 degree by curved mirror.
Wherein, camera is divided into the common camera catching visible ray and the infrared camera catching infrared light, and be used for adapting to different application scenarios, catoptron is also divided into the higher catoptron of visible reflectance and the catoptron higher to infrared reflection rate thereupon.
Wherein, the processing mode of described picture processing chip is:
A two field picture is obtained from camera;
Use moving object recognizer, the pixel region in image is divided into the foreground pixel of motion and static background pixel, and generates corresponding bianry image;
Use regional connectivity algorithm, bianry image is carried out connection process, to mark off different touching object;
Calculate the relevant informations such as the position of all touching object barycenter in the picture detected.
Wherein, the processing mode of described picture processing chip does not process the whole image that camera catches, but foundation is the center of circle with picture centre, be radius be at a certain distance that the doughnut of width is as detecting area with certain length, Processing Algorithm only processes the image in image detection district, image in this image detection district is that the light on touch-surface is formed to camera through curved reflector, camera can pass through above the image monitoring touch-surface in image detection district, to have judged whether touching object contact touch-surface.
Wherein, described optical touch screen, when not changing hardware, only can be changed the sensing range of image collecting device, thus change the sensing range size of whole optical touch screen by the radius and width regulating image detection region on software.
Wherein, described processor, two or more picture processing chip can be connected, and the touching object information integration provided by all picture processing chips becomes the information of touch point, the calculating that all picture processing chips can walk abreast, the quantity therefore increasing image collecting device can not cause the decline of processor efficiency too much.
Wherein, described touch ring, is cycle object that can be luminous, can be enclosed within the top of finger or other touching object, can sends out infrared light or visible ray to surrounding.
Wherein, described optical touch screen, be independently, do not bind with touch-surface, optical touch screen can easily take off from a touch-surface and be used on another touch-surface, image collecting device can be placed on when using touch-surface optional position in the plane, and image collecting device can arbitrarily angledly be placed, as long as before the use, enable calibration algorithm, namely optical touch screen can normally use, and described calibration steps is:
Touch-surface shows several calibration point, and provides the coordinate of calibration point in touch-surface coordinate system to calibration algorithm;
Touching object touches calibration point successively, is caught by image collecting device, and the data obtained are supplied to calibration algorithm process;
Geometric relationship is utilized the default coordinate system of image processing apparatus to be modified to the coordinate system paralleled with the coordinate system of touch-surface;
Utilize the coordinate of geometric relationship computed image harvester center in the coordinate system of touch screen surface.
Wherein, described optical touch screen, this touch-screen, without the need to overcovers such as cover glass in touch plane, adds the transmittance of screen, reduces touching device weight and cost, add the portability of device.
Wherein, described image collecting device, can use wide-angle camera to reduce the height of image collecting device, increases portability, and does not worry that the image of wide-angle camera collection has radial distortion.
Wherein, described image collecting device, the size of curved reflector can adjust depending on application scenarios, when for small size touch-surface, can reduce the size of curved reflector, with the size of downscaled images harvester, increases portability.
Wherein, described optical touch screen, it can use as a kind of portable autonomous device, and projection screen, display screen, wall, ground etc. can not have the surface of touch function to become by lower cost can touch interface.
There is provided a kind of touching object information integration to become the localization method of the information of touch point in addition, the method comprises the steps:
Touching object barycenter information is obtained from picture processing chip;
Calculate the straight-line equation through process image collecting device center and touching object barycenter, multiple touching object is by formation straight line collection;
Multiple image collecting device forms multiple straight line collection, gets any two straight line collection and is set to A and B, and the straight line in A and the straight line in B are crossing between two obtains a point set;
When more than two image collecting devices, multiple point set can be produced, get the common factor of these point sets, form touch point set, and get rid of " terrible point ";
When only having two image collecting devices, can according to screening out minority " terrible point " with algorithm and getting rid of;
Find the incidence relation of the set of present frame touch point and the set of former frame touch point, determine which touch point there occurs mobile, disappearance, which touch point is emerging point;
Result is transferred to upper computer software.
The present invention's advantage is compared with prior art:
1, this touch-screen is easy to carry, and whole equipment is light and take up space little, and in former technology, touch-screen is equally large with the area of touch-surface, cannot carry;
2, this touch-screen is a kind of general autonomous device, he does not bind with touch-surface, can easily take off from a touch-surface and be used on another touch-surface, because the sensing range size of this touch-screen can be adjusted by software, so go for the touch-surface of various sizes, in former technology, touch-screen and touch-surface often one, and the sensing range of touch-screen is fixing, therefore changes another touch-surface and just must change another touch-screen again;
3, this touch-screen installation easy to use, because image collecting device makes omnidirectional's harvester, as long as so the image collector in touch-screen is seated in touch-surface institute in the plane, this surface just can by touch-control, and the angle no matter image processing apparatus is placed and position, in technology in the past, the installation of touch-screen is complicated, and needs accurate calibration;
4, this touch-screen is convenient to safeguard, because several ingredients of touch-screen are separate removable part, so maintain easily replacing, in former technology, touch-screen ingredient damages and often needs whole replacing.
5, this touch-screen has good extendability, can be expanded according to demand by user oneself or change touch screen function, increase the quantity of image collecting device, the touch of more points can be supported, camera is replaced by the touch-screen that this touch-screen just can be become perception infrared light by infrared camera, is replaced by the touch-screen that this touch-screen just can be become perception visible ray by common camera.
Accompanying drawing explanation
Fig. 1 is image collecting device in an embodiment and picture processing chip.
Fig. 2 is that image collecting device sensing region is between the situation of the critical conditions of convergence and dive rgence when after the radius and width adjustment to certain numerical value in image detection district.
Fig. 3 is when after the radius and width adjustment to certain numerical value in image detection district, the situation that image collecting device sensing region is dispersed.
Fig. 4 is when after the radius and width adjustment to certain numerical value in image detection district, the situation of image collecting device sensing region convergence.
Fig. 5 is in an embodiment, uses the situation of frame.
Fig. 6 be image acquisition device to image in image detection district, coordinate system, motion pixel agglomerate schematic diagram.
Fig. 7 is in an embodiment, adopts a kind of image collecting device of special rotational paraboloid mirror, and surrounding is only parallel to the light reflection of touch-surface in camera by this curved reflector.
Fig. 8 is in an embodiment, the situation of the optical touch screen containing two image collecting devices.
Fig. 9 is in an embodiment, containing the situation more than the optical touch screen of two image collecting devices.
Figure 10 is in an embodiment, before carrying out calibration algorithm, and the situation of the coordinate system of two image collecting devices and the coordinate system of touch-surface.
Figure 11 is in an embodiment, after carrying out calibration algorithm, and the situation of the coordinate system of two image collecting devices and the coordinate system of touch-surface.
Figure 12 is in an embodiment, uses the situation touching ring.
Figure 13 is in an embodiment, the treatment scheme of picture processing chip.
Figure 14 is in an embodiment, the treatment scheme of processor.
Figure 15 is in an embodiment, the flow process of calibration algorithm.
Embodiment
Fig. 1 shows detailed construction and the picture processing chip 2 of image collecting device in an embodiment.This image collecting device comprises camera 11, curved reflector 12, outer casing stand 13, and this three part is all absolute construction.The curved surface of curved reflector 12 is a kind of surface of revolution, such as, can be the paraboloid of revolution or hemisphere face, select hemisphere face catoptron as an example in figure.The optical axis GW of camera 11 overlaps with the turning axle HM of curved reflector 13, picture processing chip and image collecting device are man-to-man relations, picture processing chip only processes the image that the image collecting device corresponding to it gathers, so picture processing chip can be placed in image collecting device.
Height WM due to camera 11 will ensure that camera can capture the image of above touch-surface 360 degree by curved mirror, so WM has minimum value, but because image collecting device is just in order to the direction at the place of detecting touch object, so the impact of the radial distortion that can not produce by camera uses optical lens, therefore wide-angle camera can be used to reduce WM, thus make the height reduction of image collecting device, the size of curved reflector 12 can adjust depending on application scenarios, when for small size touch-surface 5, the size of curved reflector 12 can reduce, thus the size of whole image collecting device is reduced, these two aspects all can increase the portability of this optical touch screen device.
In Fig. 6, image detection district 61 in the image 6 that camera 11 collects take picture centre as the center of circle, take r as radius, take d as the circle ring area of width, camera 11 can by above the image monitoring touch-surface 5 in image detection district 61, with judged whether touching object contact touch-surface 5, r and d all adjustable in software.After pixel binaryzation in image detection district 61, sport foreground pixel agglomerate 62 is for be identified as touching object by picture processing chip.
Only make use of the pixel in the image detection district 61 in image 6 due to picture processing chip 2, therefore, camera 11 can do special processing, makes it only return image containing image detection district 61 pixel, increases the frame frequency of camera 11 with this.
This optical touch screen, can when not changing hardware, can sensing region size only by regulating the radius r in image detection region 61 and width d to change image collecting device on software.
Fig. 2 is after the radius r in image detection district 61 and width d adjust to certain numerical value, is in light UV in a certain plane parallel with touch-surface 5 and reflects through curved reflector 12 from surrounding and enter camera 11 and be imaged on situation in image detection district.This is a kind of theoretic critical situation, and in this case, no matter touch-surface is much, and the image 6 that camera 11 collects also cannot see touch-surface 5 in image detection region, and therefore the sensing region of image collecting device is infinitely great.
Fig. 3 is after the radius r in image detection district 61 and width d adjust to certain numerical value, to reflect enter camera 11 and be imaged on situation in image detection district higher than the light UV of plane parallel with touch-surface 5 in Fig. 2 from surrounding through curved reflector 12.In this case, no matter touch-surface 5 is much, the image 6 that camera 11 collects also cannot see touch-surface 5 in territory, image detection district 61, therefore the sensing region of image collecting device is infinitely great, namely the sensing region of image collecting device is dispersed, and this situation should be avoided, because in this case, even if do not contact touch-surface 5, also touch operation may be caused.
Fig. 4 is when after the radius and width adjustment to certain numerical value in image detection district 61, to reflect enter camera 11 and be imaged on situation in image detection district lower than the light of plane parallel with touch-surface 5 in Fig. 2 from surrounding through curved reflector 12.In this case, the image 6 that camera 11 collects can see the plane at touch-surface 5 place in image detection district 61, the sensing region convergence of image collecting device, this is normal situation about using, and during r reduction, the radius MS of the sensing region of image collecting device increases, and namely the sensing range of image collecting device increases.
In Fig. 7, the curved surface of curved reflector 12 is certain rotary parabolic line curved surfaces, and this curved reflector 12 only to camera 11 reflected parallel in the light of touch-surface, and can not reflect the light in other directions.At this moment, the sensing region of image collecting device is dispersed and non-adjustable, frame must be used to block the sensing region of image collecting device, but, change image detection zone radius and can adjust the height of touch-screen from actual touch surface, make touching object need not contact touch-surface can be identified, the damage that touch-surface and touching object occur because of friction can be reduced like this.
In Fig. 4, because there is certain width d in image detection district 61, therefore after curved mirror reflection mirror 12 reflects, camera 11 can see with MT to be internal diameter, with MS be external diameter annulus in touch-surface 5, therefore in this annulus, touch-surface 5 can not show, but touching object can be perceived.So when this optical touch screen is as touch pad, when namely touch-surface does not have and shows dynamically, touch-surface 5 can be in MS in the scope of the circle being radius; When touch-surface 5 have show dynamically time, touch-surface 5 can only be in MT in the scope of the circle being radius.
Due to the structure of image collecting device, the circle that the sensing region of image collecting device is is the center of circle with image collecting device center M.In Fig. 5,1-1,1-2 are two image collecting devices, 8 is frame, 5 is touch-surface, region in figure in circular dashed line is the sensing region of image collecting device, the object moved in two circular sensing regions all can affect optical touch screen, but because the position determining touch point at least needs to be caught by two image collecting devices simultaneously, so only have the common factor of two sensing regions just can calculate the position of touch point, therefore touch screen panel 5 must be comprised in the common factor of two sensing regions.After the periphery at touch-surface installs frame 8 additional, the sensing region of image processing apparatus is truncated, and the moving object only in frame 8 just can be perceived, to avoid maloperation.
Frame is folding housing, and size is larger than touch-surface, the color of scuncheon should as far as possible with conventional touching object as the color contrast pointed is large, to be easily identified.
In Fig. 8,1-1,1-2 are image collecting device, and processor 3 can connect two or more image collecting devices, and as an example, in Fig. 8, processor 3 is connected to two image collecting devices, and the result of process is also sent to host computer 7 by processor.
In Fig. 8, two touching object P1 and P2 are had in touch-surface 5, 1-1, 1-2 captures two touching object, and the centroid position of two touching object in images themselves is passed to processor, processor calculates the straight-line equation appearing image collecting device center and touching object barycenter according to these information, here the information provided by 1-1 calculates the equation of straight line C1P1 and straight line C1P2, the information provided by 1-2 calculates the equation of straight line C2P1 and straight line C2P2, these two groups of straight lines intersect respectively, calculate touch point P1, P2 and " terrible point " P1, the position of P2, that is when there being two image collecting devices, multiple spot touches simultaneously and can produce " terrible point ", namely touch point here have two kinds may P1, P2 or P1 ', P2 ', but in two touch, utilize algorithm almost can get rid of " terrible point ", more point touches simultaneously and just needs multiple image collecting device.
Fig. 9 can be used for setting forth, this optical touch screen how to utilize the image collecting device more than two to get rid of " terrible point ", 1-1, 1-2, 1-3 is 3 image collecting devices, 3 groups of straight-line equations are obtained after the information processing that they provide by processor, two straight lines relevant with 1-1 and relevant with 1-2 two straight line intersection obtain the point set containing 4 points, two straight lines relevant with 1-2 and relevant with 1-3 two straight line intersection obtain the point set containing 4 points, the common factor getting these two point sets is real touch point, be here P1, P2, this embodies the good support of this optical touch screen to multiple point touching, and good extensibility.
Figure 10 is in an embodiment, before carrying out calibration algorithm, and the situation of coordinate system O2, O3 of two image collecting devices and the coordinate system O1 of touch-surface.At this moment 3 coordinate systems not parallel, and do not know O2, O3 coordinate origin and the image collecting device center coordinate in the coordinate system O1 of touch-surface, two necessary conditions that this optical touch screen can normally work are: the coordinate system of all image collecting devices is parallel with touch-surface coordinate system; The coordinate of all image collecting device centers in touch-surface coordinate system O1 is known.
Figure 11 is in an embodiment, carry out the situation after calibration algorithm, can see that coordinate system O2, O3 of two image collecting devices are parallel with the coordinate system O1 of touch-surface, and the coordinate of the initial point of O2, O3 in O1 is known, this optical touch screen is now calibrated complete, normally can start work.As can see from Figure 6, the coordinate of the image that image collecting device captures before calibration is default coordinate is 63, the x-axis of 63 is parallel with the direction of image transverse direction, and the y-axis of 63 is parallel with the direction of image longitudinal direction, and the coordinate system 63 after calibration can rotate to an angle and become coordinate system 64.
When calibration algorithm runs, touch-surface 5 demonstrates several calibration point, such as the A1 in Figure 11, A2, A3, A4, and provide the coordinate of calibration point in touch-surface coordinate system to calibration algorithm, touching object clicks the image of the calibration point being presented at touch-surface successively, after image collecting device captures touching object, the data obtained are supplied to calibration algorithm process, calibration algorithm passes through geometric relationship, can calculate image collecting device self default coordinate be 63 need to rotate how many angles could be parallel with the coordinate system O1 of touch-surface, and calculate the coordinate of image collecting device bottom center M point in O1, to meet two necessary conditions making this optical touch screen normally work.
Because there has been above-mentioned calibration algorithm, thus image collecting device almost can optional position, arbitrarily angled placement, as long as before the use, enable calibration algorithm, namely can normally use.But in order to better effect, image collecting device to be placed on outside touch-surface 5 and to separate certain distance and places by we, and the touch point calculated like this is more accurate.
Figure 12 is in an embodiment, uses the situation touching ring.Touch ring 4 is cycle object that can be luminous, be enclosed within the top of finger or other touching object, infrared light or visible ray is sent out to surrounding, when touch-screen is when visible ray interference is larger, such as light change is violent, or when reliability and stability require higher, the camera of image collecting device can be replaced by infrared camera, touching object band is sent out the touch ring of infrared light, visible ray can be avoided like this to disturb, increase system reliability and stability, when touch-screen is when light is darker, can by touch ring luminous on touching object band, camera is made to perceive touching object.
Claims (8)
1. a multipoint portable optical touch screen, is characterized in that, comprising:
Image collecting device, for gathering the image above touch-surface; This image collecting device comprises camera (11), curved reflector (12), outer casing stand (13);
Picture processing chip, the image that process image acquisition device arrives, identifies touching object and calculates touching object relevant information;
Processor, for calibrating touch-screen, and processes the information that two or more picture processing chip provides, and calculates touch point positional information, then touch point information is sent to upper computer software;
Touch ring, be ring that can be luminous, under the condition that visible ray interference is large or light is dark, be enclosed within the top of finger or other touching object, improve touch quality;
Frame, for folding housing, when interference causing to touch-screen for the moving object outside touch-surface, touch-surface and image collecting device are fenced up, with the acquisition range of limited images harvester, prevent the moving object outside touch-surface from disturbing touch-screen;
The processing mode of described picture processing chip is:
A two field picture is obtained from camera;
Use moving object recognizer, the pixel region in image is divided into the foreground pixel of motion and static background pixel, and generates corresponding bianry image;
Use regional connectivity algorithm, bianry image is carried out connection process, to mark off different touching object;
Calculate the location dependent information of all touching object barycenter in the picture detected;
The processing mode of described picture processing chip does not process the whole image that camera catches, but foundation is the center of circle with picture centre, be radius at a certain distance, be that the doughnut of width is as detecting area with certain length, Processing Algorithm only processes the image in image detection district, image in this image detection district is that the light above touch-surface is formed to camera through curved reflector, camera can pass through above the image monitoring touch-surface in image detection district, to have judged whether touching object contact touch-surface;
Wherein the curved surface of curved reflector is a kind of surface of revolution;
Camera and curved reflector are fixed together by outer casing stand, and camera is directly over curved reflector, and the position relationship of camera and curved reflector meets following requirement:
The optical axis of cam lens overlaps with the turning axle of the curved surface of curved reflector, and the picture centre that camera is captured is the center of curved reflector;
The height of camera will ensure that camera can capture the image of above touch-surface 360 degree by curved mirror.
2. a kind of multipoint portable optical touch screen according to claim 1, it is characterized in that, the omni-directional image harvester that described image collecting device is made up of camera, curved reflector and outer casing stand, camera, curved reflector, outer casing stand are individual components, can dismounting and change.
3. a kind of multipoint portable optical touch screen according to claim 2, it is characterized in that, camera is divided into the common camera catching visible ray and the infrared camera catching infrared light, be used for adapting to different application scenarios, catoptron is also divided into the higher catoptron of visible reflectance and the catoptron higher to infrared reflection rate thereupon.
4. a kind of multipoint portable optical touch screen according to claim 1, it is characterized in that, described optical touch screen, when not changing hardware, only can be changed the sensing range of image collecting device by the radius and width regulating image detection region on software, thus change the sensing range size of whole optical touch screen.
5. a kind of multipoint portable optical touch screen according to claim 1, it is characterized in that, described processor, two or more picture processing chip can be connected, and the touching object information integration provided by all picture processing chips becomes the information of touch point, the calculating that all picture processing chips can walk abreast, the quantity therefore increasing image collecting device can not cause the decline of processor efficiency too much.
6. a kind of multipoint portable optical touch screen according to claim 1, is characterized in that, described touch ring, is cycle object that can be luminous, can be enclosed within the top of finger or other touching object, can sends out infrared light or visible ray to surrounding.
7. a kind of multipoint portable optical touch screen according to claim 1, it is characterized in that, described optical touch screen, independently, do not bind with touch-surface, optical touch screen can easily take off from a touch-surface and be used on another touch-surface, image collecting device can be placed on when using touch-surface optional position in the plane, and image collecting device can arbitrarily angledly be placed, as long as before the use, enable calibration algorithm, namely optical touch screen can normally use, and described calibration steps is:
Touch-surface shows several calibration point, and provides the coordinate of calibration point in touch-surface coordinate system to calibration algorithm;
Touching object touches calibration point successively, is caught by image collecting device, and the data obtained are supplied to calibration algorithm process;
Geometric relationship is utilized the default coordinate system of image processing apparatus to be modified to the coordinate system paralleled with the coordinate system of touch-surface;
Utilize the coordinate of geometric relationship computed image harvester center in the coordinate system of touch screen surface.
8. touching object information integration becomes a localization method for the information of touch point, utilizes the multipoint portable optical touch screen described in claim 1, it is characterized in that: the method comprises the steps:
Touching object barycenter information is obtained from picture processing chip;
Calculate the straight-line equation through process image collecting device center and touching object barycenter, multiple touching object is by formation straight line collection;
Multiple image collecting device forms multiple straight line collection, gets any two straight line collection and is set to A and B, and the straight line in A and the straight line in B are crossing between two obtains a point set;
When more than two image collecting devices, multiple point set can be produced, get the common factor of these point sets, form touch point set, and get rid of " terrible point ";
When only having two image collecting devices, can according to screening out minority " terrible point " with algorithm and getting rid of;
Find the incidence relation of the set of present frame touch point and the set of former frame touch point, determine which touch point there occurs mobile, disappearance, which touch point is emerging point;
Result is transferred to upper computer software.
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| CN103425355B (en) * | 2013-07-08 | 2016-09-07 | 狒特科技（北京）有限公司 | The portable optical touch screen of a kind of omnidirectional camera structure and location calibration steps thereof |
| CN104090661B (en) * | 2014-07-14 | 2017-06-30 | 香港应用科技研究院有限公司 | Portable interactive whiteboard module |
| CN107003758B (en) * | 2015-06-16 | 2020-04-28 | 华为技术有限公司 | Ghost point processing method and user equipment |
| CN108845692B (en) * | 2018-06-01 | 2021-09-24 | Oppo广东移动通信有限公司 | Replacement method and electronic device |
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