Background technology
Along with the appearance of more next more touch-screens, the accurate identification of the touch point of touch-screen is seemed particularly important.
In prior art, the touch point recognition methods of touch-screen mainly comprises following several mode: 1, for resistive touch screen, and touch-screen is made up of the two-layer transparent resistive material with surface resistance separated up and down.When touch experienced by screen, namely touch screen surface be subject to enough large pressure time, can produce between top layer with bottom and contact, spread out of corresponding electric signal by inductor, utilize voltage divider principle the physical location of touch point can be converted to the voltage representing x, y coordinate, thus determine the particular location of touch point.2, for capacitive touch screen, touch-screen four limit is all coated with long and narrow electrode, in electric conductor, form electric field.User is when touch screen, human body electric field, can form a coupling capacitance between finger and conductor layer, the electric current that four limit electrodes send can flow to touch point, and the strong and weak distance with pointing electrode of electric current is directly proportional, according to ratio and the power of electric current, determine the particular location of touch point.3, for infrared-type touch-screen, lay infrared transmitter on the adjacent both sides of screen, each opposite side is laid and is received infrared infrared remote receiver, and screen is determined two-dimensional infrared wire matrix.User is when touch screen, and finger can produce the infrared ray in x, y direction and block, and receives ultrared situation, can determine the two-dimensional coordinate of touch point, namely determine the particular location of touch point according to infrared remote receiver.
State in the touch point identifying of touch-screen in realization, inventor finds that in prior art, at least there are the following problems: the touch point of resistive touch screen identifies, limits by voltage, multiple touch point cannot be identified simultaneously, do not support multiple point touching, and complex manufacturing technology, cost is higher.The touch point of capacitive touch screen identifies, by current limit, when there being conductor near touch-screen, easily causes the mistake identification of touch point, identifies that precision is lower, and complex manufacturing technology, cost is higher.The touch point of infrared-type touch-screen identifies, limits by screen resolution and device precision, identifies that precision is lower.
Utility model content
Embodiment of the present utility model provides a kind of touch point recognition device of touch-screen, can identify multiple touch point simultaneously, supports multiple point touching.When there being conductor near touch-screen, the mistake identification of touch point can not be caused, identifying that precision is higher.Manufacture craft is simple, and cost is lower.Do not limit by screen resolution and device precision, identify that precision is higher.
For achieving the above object, embodiment of the present utility model adopts following technical scheme:
The utility model provides a kind of touch point recognition device of touch-screen, comprise touch-screen, laser line generator, camera, controller, processor and display, wherein: described controller is connected with described laser line generator and described camera respectively, described processor is connected with described controller and described display respectively; Described touch-screen is arranged in the image acquisition region of described camera; Described laser line generator, for launching the line laser parallel with described touch-screen under the control of described controller; Described camera, for gathering the image of described line laser at the flare of the touch point of described touch-screen under the control of described controller, and is sent to described controller by the image of the described flare gathered; Described controller, for being sent to described processor by the image of the described flare received; Described processor, for obtaining the positional information of described flare at display interface according to the image of the described flare received, and is sent to display by described flare in the described positional information of described display interface; Described display, for showing the position of described display interface and touch point corresponding to described flare in the described positional information of described display interface according to the described flare that receives.
In device as above, the distance between described line laser and described touch-screen is less than 3 millimeters.
In device as above, described laser line generator is at least two, and described camera is at least two.
In device as above, described at least two laser line generators are arranged at the both sides of described touch-screen respectively, and the light direction of the described laser line generator of described touch-screen both sides is contrary; Described at least two described cameras are arranged at the both sides above described touch-screen.
In device as above, described laser line generator is iraser.
In device as above, described camera is sense infrared camera.
In device as above, the wavelength of the described line laser that described iraser is launched is 830 nanometers.
Device as above also comprises: fixture, for fixedly mounting described camera.
In device as above, described fixture comprises: the first slide bar and the second slide bar, and wherein: described first slide bar is vertical with described second slide bar, described camera can move along described first slide bar, and described first slide bar can move along described second slide bar.
The touch point recognition device of the touch-screen that the utility model provides, pointed by gathering line laser or the image of flare after felt pen reflection, and obtain the positional information of flare at display interface according to the image of flare, can realize identifying multiple touch point simultaneously, support multiple point touching.When there being conductor near touch-screen, the mistake identification of touch point can not be caused, identifying that precision is higher.Manufacture craft is simple, and cost is lower.Do not limit by screen resolution and device precision, identify that precision is higher.
Embodiment
Be described in detail below in conjunction with the touch point recognition device of accompanying drawing to the utility model embodiment.
Embodiment one
The logic diagram of a touch point recognition device embodiment of the touch-screen that Fig. 1 provides for the utility model.The side view of touch-screen, laser line generator and camera in the touch point recognition device that Fig. 2 is the touch-screen shown in Fig. 1.The schematic diagram of camera collection flare in the touch point recognition device that Fig. 3 is the touch-screen shown in Fig. 1.As shown in FIG. 1 to 3, the touch point recognition device of the utility model embodiment specifically comprises touch-screen 11, laser line generator 12, camera 13, controller 14, processor 15 and display 16.Wherein:
Controller 14 is connected with laser line generator 12 and camera 13 respectively, and processor 15 is connected with controller 14 and display 16 respectively.
Touch-screen 11 is arranged in the image acquisition region of camera 13.
Particularly, touch-screen 11 can be a plane for touch operation made separately, also can for existing any one be convenient to the plane of touch operation, such as desktop, blackboard etc.Camera 13 can be one or more.If camera 13 is two, then as shown in FIG. 1 to 3, the both sides above touch-screen 11 can be arranged at, and be positioned at different planes from touch-screen 11, by adjusting the angle of camera, making touch-screen 11 be positioned at the image acquisition region of camera 13.
Laser line generator 12 is for launching the line laser 17 parallel with touch-screen 11 under control of the controller 14.
Particularly, controller 14 can start or stop emission line laser 17 by control line laser instrument 12.Preferably, due to infrared laser, to have coherence good, and therefore laser line generator 12 can be iraser.Preferably, because the composition of indoor light source 830 nanometer (nm) wave band is less, therefore laser line generator 12 can be the iraser of the infrared light of 830nm for emission wavelength.Preferably, laser line generator 12 will be close to touch-screen 11, launches the line laser 17 parallel with touch-screen 11, and such as, distance between the line laser 17 that laser line generator 12 is launched and touch-screen 11 is less than 3 millimeters (mm).Laser line generator 12 can be one or more.If laser line generator 12 is two, then as shown in FIG. 1 to 3, the both sides of touch-screen 11 can be arranged at, and the light direction of two laser line generators 12 is contrary, namely laser line generator 12 light direction being positioned at left side, for the right, is positioned at laser line generator 12 light direction on right side for left.
The image of the flare of collection at the image of the flare of the touch point 18 (shown in Fig. 3) of touch-screen 11, and is sent to controller 14 for gathering line laser 17 under control of the controller 14 by camera 13.
Particularly, if laser line generator 12 is iraser, then camera 13 is sense infrared camera.Because common camera carries out coating process in the light path of camera lens, infrared light has been filtered, therefore common camera cannot sense infrared light.Therefore need to feel infrared process to the camera lens of common camera, make it can through the infrared light of 830nm wavelength.In addition, for reducing the interference of other light, can increase the optical filter of a 830nm in the light path of the camera lens of camera 13, making the infrared light of 830nm wavelength high thoroughly, the light of other wavelength cannot be through.
Controller 14 is for being sent to processor 15 by the image of the touch-screen received 11 and the image of flare.
Flare for obtaining the positional information of flare at display interface 19 according to the image of the flare received, and is sent to display 16 in the positional information of display interface 19 by processor 15.
Particularly, first user touches respectively on four of touch-screen 11 summits, processor 15 is according to the image of receive four flares (when camera 13 is two, image for two flares of same touch point 18 carries out split, namely the flare of this touch point 18 correspondence comprises the image overlapping region of two flares and the image not overlapping region of two flares) extract flare region according to background modeling method, and extract hot spot by thresholding and the prediction of morphology barycenter is carried out to hot spot, obtain the coordinate of four flares, i.e. four coordinates of summit under image coordinate system of touch-screen 11.Suppose that four coordinates of summit under image coordinate system of touch-screen 11 are respectively (x1, y1, z1), (x2, y2, z2), (x3, y3, and (x4 z3), y4, z4), the coordinate on four summits of display interface 19 is respectively (u1, v1, w1), (u2, v2, w2), (u3, v3, and (u4 w3), v4, w4), then according to coordinate (x1, y1, z1), (x2, y2, z2), (x3, y3, z3), (x4, y4, and coordinate (u1 z4), v1, w1), (u2, v2, w2), (u3, v3, w3), (u4, v4, w4) perspective matrix A can be calculated:
Wherein, (u1, v1, w1)=(x1, y1, z1) A,
(u2，v2，w2)＝(x2，y2，z2)A，
(u3，v3，w3)＝(x3，y3，z3)A，
(u4，v4，w4)＝(x4，y4，z4)A。
User touches arbitrarily on touch-screen 11, processor 15 obtains the coordinate (x5 of this touch point 18 under image coordinate system according to the image of the flare received, y5, z5), and according to perspective matrix A, obtain the coordinate (u5 of this touch point 18 at display interface 19, v5, w5), and by coordinate (u5, v5, w5) be sent to display 16.
Wherein, (u5, v5, w5)=(x5, y5, z5) A.
Display 16 is for according to the flare that the receives position in the positional information display display interface 19 of display interface 19 and touch point 18 corresponding to flare.
Particularly, display 16 shows the position of touch point 18 in display interface 19 according to the coordinate received (u5, v5, w5).When user chooses handwriting functions, if user is operating as the multiple touch point 18 of continuous print on touch-screen 11, such as write, drawing etc., then display 16 shows the track of touch point 18 in display interface 19, realize identifying write, the interactive function of drawing etc.
Further, the touch point recognition device of the utility model embodiment can also comprise:
Storer, for storing the track of touch point 18 in display interface 19, such as word, picture etc.
Further, when user chooses mouse function, user's being operating as on touch-screen 11 is clicked or is double-clicked, processor 15 is according to the coordinate (u5 of the touch point 18 calculated at display interface 19, v5, w5) and click or double-click that function is clicked the simulation of the position of touch point 18 in display interface 19, double click operation, the interactive function that analog mouse is clicked, double-clicked is realized.
Further, the touch point recognition device of the utility model embodiment can also comprise:
Fixture 20, for fixedly mounting camera 13.
Further, the touch point recognition device of the utility model embodiment, in installation process, need carry out the mechanical fine adjustment of two-freedom, guarantee that touch-screen 11 is positioned at the image acquisition region of camera 13 to camera 13.The structural representation of fixture in the touch point recognition device that Fig. 4 is the touch-screen shown in Fig. 1.As shown in Figure 4, fixture 20 can comprise: the first slide bar 201 and the second slide bar 202.Wherein:
First slide bar 201 is vertical with the second slide bar 202, and camera 13 can move along the first slide bar 201, and the first slide bar 201 can move along the second slide bar 202.
It should be noted that, camera 13 also can move along the second slide bar 202 herein, and the second slide bar 202 can move along the first slide bar 201.
Further, the touch point recognition device of the utility model embodiment before use, needs to carry out correction process to the distortion of camera 13.
The touch point recognition device of the utility model embodiment, pointed by gathering line laser or the image of flare after felt pen reflection, and obtain the positional information of flare at display interface according to the image of flare, can realize identifying multiple touch point simultaneously, support multiple point touching.When there being conductor near touch-screen, the mistake identification of touch point can not be caused, identifying that precision is higher.Manufacture craft is simple, and cost is lower.Do not limit by screen resolution and device precision, identify that precision is higher.
The above; be only embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; change can be expected easily or replace, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of described claim.