WO2015180248A1

WO2015180248A1 - Touch screen touch area positioning method

Info

Publication number: WO2015180248A1
Application number: PCT/CN2014/082467
Authority: WO
Inventors: 王迪; 李金鹏; 齐洋
Original assignee: 湖州佳格电子科技有限公司
Priority date: 2014-05-30
Filing date: 2014-07-18
Publication date: 2015-12-03
Also published as: CN107506094B; CN103984449B; CN103984449A; CN107506094A

Abstract

The present invention relates to the technique of touch screens, and in particular to a touch screen touch area positioning method. The present invention is implemented through the following technical solution. The touch screen touch area positioning method comprises the following steps: (1) obtaining all blocked light paths; (2) converting the blocked light paths into polygonal data; and (3) if a set of light paths at the same angle is a light path layer, intersecting polygons in one light path layer with polygons in another light path layer to obtain a new group of polygons, then intersecting the new group of polygons with polygons in still another light path layer to obtain new polygons again, repeating the process until polygons of all light path layers are intersected, obtaining an ultimate group of polygons that comprises at least one polygon body, and recording data of the group of polygons that consists of data of all polygon bodies. By means of the present invention, identification of a touch area consumes little time and has high efficiency.

Description

Description A touch screen touch area positioning method

Technical field

The present invention relates to touch screen technology, and in particular, to a touch screen touch area positioning method.

Background technique

A multi-point identification positioning method and system for an infrared touch screen disclosed in the invention patent application No. CN102419662A, which firstly generates an axis corresponding to an infrared touch screen in a recognition process. The axis image; then the touch point information is extracted in the axis image; however, such an image processing based recognition method requires the global processing of the touch point, and thus takes a long time.

Summary of the invention

An object of the present invention is to provide a touch screen touch area positioning method, which has short time and high efficiency in recognition of a touch area.

The above technical object of the present invention is achieved by the following technical solutions: A touch screen touch area positioning method, comprising the following steps:

(1) Detecting all light paths and obtaining all blocked light paths;

(2) converting the blocked optical path into polygon data, that is, determining the coordinates of each of the infrared emitting elements and the infrared receiving elements, thereby determining the coordinates of the vertices of the blocked optical path;

(3) Assume that the set of optical paths of the same angle is a layer of optical path; intersect the polygons in one layer of the optical path with the polygons in the other layer of optical path to obtain a new set of polygons, and then add the new set of polygons The polygons in one layer of the optical path intersect to obtain a new polygon again; thus repeating to complete the intersection of the polygons of all the optical path layers, thereby obtaining the last set of polygons, the last set of polygons including at least one polygon, and recording the set of polygons Data, the set of polygon data consists of all polygon single data.

The optical path from an infrared emitting element to an infrared receiving element is a unit optical path; the optical width of the starting point of the optical path determined by each infrared emitting element should be equal to the optical width of the end point of the optical path determined by each infrared receiving element, assuming each The light width of the starting point of the optical path determined by the infrared emitting element is a unit light width; according to the resolution of the touch screen, the unit light width is determined to be n; thereby establishing a coordinate XY system, so that each infrared emitting element and the infrared receiving element are composed of two coordinates limited.

As a preferred embodiment of the present invention, the step (1) and the step (2) further have the following steps: the optical path formed by an infrared emitting element to an infrared receiving element is a unit optical path, and the optical path obtained by the step (1) is That is, all the blocked unit optical paths detect all blocked unit optical paths. If there are adjacent unit optical paths in the same optical path layer, the adjacent unit optical paths are combined to form a group of optical path groups. As a preferred embodiment of the present invention, the step (2) is specifically: converting the blocked unit optical path and/or the optical path group into polygon data, that is, determining the coordinates of each of the infrared emitting elements and the infrared receiving elements, thereby determining that the block is blocked. The coordinates of the vertices of the light path.

As a preferred embodiment of the present invention, the step (3) further includes the step of filtering the true touch area, the step comprising: a, detecting all the polygons in the last set of polygons obtained through the step (3), determining the most The polygons obtained by intersecting the layer optical path layers are true touch generating regions; if the polygon elements are obtained by intersecting the optical path layers smaller than the m layers, it is determined that the polygon single body is a false touch generating region; m is smaller than the total number of optical path layers.

As a preferred embodiment of the present invention, the step of screening the true touch area further includes

b. If the polygons in the last group of polygons are obtained by intersecting the optical path layers of the m layer or more and less than the total optical path layer, detecting all blocked optical paths passing through the polygon, if there is a single through the polygon However, if the optical path of the polygon single body that has been determined to be the true touch generation area is not passed, it is determined that the polygon single is a true touch generation area, and if it does not exist, it is determined as a false touch generation area.

In summary, the present invention has the following beneficial effects: The present invention defines an optical path for each unit to an infrared emitting element and an infrared receiving element, thereby, for each infrared emitting element and each infrared receiving element according to the resolution of the touch screen. The position is positioned by coordinates, which is equivalent to positioning the polygon formed by the optical path of each unit by coordinates; when the touch point is recognized, the optical path is first scanned to obtain the blocked unit optical path, thereby narrowing the determination range of the touch generation area. Therefore, time is saved, recognition efficiency is improved, and coordinate positioning is performed for each unit optical path according to resolution, so that it is more accurate when determining the touch generation area; the present invention does not need to be continuous when determining the angle of the optical path layer. angle.

DRAWINGS

1 is a schematic view of a touch generation area K of Embodiment 2;

Figure 2 is a schematic view showing the optical path blocked in Embodiment 2;

3 is a schematic view showing the intersection of the optical path A and the optical path B in Embodiment 2;

4 is a schematic view showing the intersection of a region G and an optical path C in Embodiment 2;

5 is a schematic diagram of the optical path combination of the same angle unit in Embodiment 2;

Fig. 6 is a view showing a touch generation area in the fourth embodiment.

detailed description

The invention will be further described in detail below with reference to the accompanying drawings.

The present invention is only an explanation of the present invention, and is not intended to limit the present invention. Those skilled in the art can make modifications without innovating the present embodiment as needed after reading the present specification, but as long as the present invention has the right. All patents are protected by patent law.

Embodiment 1: As shown in Fig. 1, an infrared emitting element 1 and an infrared receiving element 2 are respectively disposed on four sides of a touch screen.

It is assumed that the optical path from one infrared emitting element 1 to one infrared receiving element 2 is a unit optical path.

The infrared emitting element 1 is used as the starting point of the optical path, and the infrared receiving element 2 is used as the optical path end point. The light width of the starting point of the optical path determined by each of the infrared emitting elements 1 should be equal to the light width of the end point of the optical path determined by each of the infrared receiving elements 2, The light width at the start of the optical path determined by each of the infrared emitting elements 1 is a unit light width.

According to the resolution of the touch screen, determine the unit light width is n; thereby establishing a coordinate XY system, as shown in Fig. 1, the point in the lower left corner of the touch screen is the origin (0, 0), and the point in the upper right corner is Umax, Ymax); Both the infrared emitting element and the infrared receiving element are defined by two coordinates.

A polygon-based touch area localization method includes the following steps:

(1) Hardware initialization, thereby determining the coordinates corresponding to each of the infrared emitting elements and the infrared receiving elements, assuming that the set of optical paths of the same angle unit is a layer of optical path, determining the number of layers of the optical path layer mmax and the angle of each layer of the optical path layer ;

(2) In all frames, all the optical paths of the unit are detected, and all blocked optical paths are obtained;

(3) detecting a blocked unit optical path in each layer of the optical path layer, and if the blocked unit optical path in the optical path layer of the layer has adjacent unit optical paths, combining the adjacent unit optical paths to form a group of optical paths;

(4) converting each set of optical paths and/or each unit optical path obtained in step (3) into polygon data, that is, coordinates corresponding to each of the infrared emitting elements and the infrared receiving elements determined according to step (1), Recording the coordinates of the vertices of each set of optical paths and/or each optical path obtained by the step (3), and storing them in the memory, each set of optical paths or each unit optical path corresponding to a polygon;

(5) intersecting a polygon in one layer of the optical path with a polygon in another layer of the optical path, and obtaining a new polygon based on the intersection of two arbitrary polygons to obtain a new set of polygons, the new set of polygons including One or more polygons are stored in memory;

(6) intersecting the new set of polygons obtained in step (5) with the polygons in another layer of the optical path layer, and according to the logic algorithm of step (5), obtaining a new set of polygons again, and storing them in the memory;

(7) Repeat step (6) to complete the intersection of the polygons of all the optical path layers to obtain the last set of polygons;

(8) Filter each polygon in the last set of polygons obtained in step (7) to obtain a touch occurrence area.

The screening method in step (8) includes the following steps:

a. Detecting all the polygons in the last set of polygons obtained in step (4), and determining that the polygons obtained by intersecting the most layers of the optical path layers are true touch generating regions; if the polygons are smaller than the optical path of the m layers Layers intersect Then, determining that the polygon unit is a false touch generating area; m is smaller than the total number of layers of the optical path layer;

When the actual touch occurrence area is relatively small, some of the angles of the light route are blocked by the infrared component, which causes the signal fluctuation of the infrared tube to be not very large, so that the judgment of the optical path block in step 2 is incorrect, and thus the logical cause occurs. The optical path is missing, so that some true touch occurrence regions are obtained by intersecting the optical path layers of less than m layers.

The logical algorithm in which the two arbitrary polygons intersect to obtain a new polygon is a logical algorithm based on the intersection of straight lines to obtain intersections.

The logical algorithm for intersecting lines to get intersections is:

Let the line A (xl , yl) (x2, y2) line B (x3, y3) (x4, y4)

Int nDxl=x2-xl ;

Int nDyl=y2-yl _;

Int nDx2=x4-x3;

Int nDy2=y4-y3 _;

Int nB^nDyl^xl-nDxl^yl ;

Int nB2=nDy2*x3- nDx2*y3;

Int nD=nDxl*nDy2-nDx2*nDy 1;

Float fBDl= (float) nBl/nD;

Float fBD2= (float) nB2/nD _;

nBl= (int) (fBD2*nDxl);

nB2= (int) (fBDl*nDx2);

x= (—signed—short) (nBl~nB2);

nBl= (int) (fBD2*nDyl);

nB2= (int) (fBDl*nDy2);

y= (—signed—short) (nBl~nB2);

The intersection of line A and line B is (x, y).

Of course, the intersection of two polygons inevitably leads to another polygon, and the algorithm is also diverse, and is not limited to one of the above algorithms. Embodiment 2: As shown in FIG. 1, the region K where the touch region occurs, the step of identifying the region Κ is as follows,

(1) Perform all optical path scanning in one frame. In Figure 2, the dotted line and the solid line of the same angle represent a layer of optical path, and all the blocked optical paths are obtained. The unit has three optical paths, respectively A. , B, C, as shown in the solid line area in Figure 2, and obtain the coordinates of the three optical paths, that is, the four vertices of the optical path A are Al (Xal, Yal), A2 (Xa2, Ya2), A3 (Xa3, Ya3), A4 (Xa4, Ya4), since the three optical paths are unit optical paths, Xa2-Xal=n, Yal=Ya2=Ymax, Xa3-Xa4=n, Ya3=Ya4=0 _;

The four vertices of the optical path B are Bl (Xbl, Ybl), B2 (Xb2, Yb2), B3 (Xb3, Yb3), B4 (Xb4, Yb4), since the three optical paths are unit optical paths, Xb2-Xbl=n, Ybl= Yb2=Ymbx, Xb3-Xb4=n, Yb3=Yb4=0;

The four vertices of the optical path C are CI (Xcl, Ycl), C2 (Xc2, Yc2), C3 (Xc3, Yc3), C4 (Xc4, Yc4), since the three optical paths are unit optical paths, Xc2-Xcl=n, Ycl= Yc2=Ymcx, Xc3-Xc4=n, Yc3=Yc4=0;

(2) As shown in Fig. 3, first, the optical path A and the optical path B are intersected to obtain a polygon result, that is, the region G, and the coordinates of the four vertices of the region G, that is, Gl (Xgl, Ygl), G2 (Xg2, Yg2), G3 (Xg3, Yg3), G4 (Xg4, Yg4),

(3) As shown in Fig. 4, the region G and the optical path C are intersected to obtain another polygonal structure, that is, the region K, and according to the above-mentioned straight line intersection logic algorithm, the coordinates of the five vertices of the region , are obtained, that is, Kl (Xkl , Ykl), K2 (Xk2, Yk2), K3 (Xk3, Yk3), K4 (Xk4, Yk4), K5 (Xk5, Yk5), where K5 (Xk5, Yk5) is G2

(Xg2, Yg2) _;

If the area K spans at least two unit optical paths, as shown in FIG. 5, the area K crosses the unit optical path E and the unit optical path F, that is, the area K simultaneously blocks the same angle and the adjacent unit optical path E and the unit optical path F, and the same The adjacent elemental light paths of the angle are combined to form a set of optical paths H to intersect with the other optical paths to obtain a polygonal result.

Embodiment 3: At least two touch points are simultaneously generated, and the recognition manner is similar to that of Embodiment 1, except that two or more polygon result coordinates are simultaneously calculated when calculating the coordinates of the polygon result.

Embodiment 4: As shown in FIG. 6, the touch generation areas are K1, Κ2, and Κ4, and the process of identifying the two touch generation areas is as follows: Assume that the optical path layer mmax is six layers, respectively A, B, C, D, E and F; Each layer of optical path is shown in Figure 6 with dashed lines and solid lines at different angles.

The blocked optical path is as follows: Al, A2, A3 in the optical path layer A; Bl in the optical path layer B; Cl, C1 in the optical path layer C; D1 in the optical path layer D; E1; The optical path layer F is Fl, F2; these optical paths are indicated by solid lines in Fig. 6; thus, five polygonal results are obtained, which are Κ1, Κ2, Κ3, Κ4, Κ5, and of course, the actual polygons are more than these five. This embodiment only selects these five polygons for example;

Determining that the polygon obtained by intersecting the optical path layers of three layers or less, including the three layers, is a false touch occurrence area, The result of the polygon obtained by intersecting the frontmost layer of the optical path layer is the true touch generation area.

K1, Κ2, Κ3, Κ4, Κ5 five polygon results, where K1 is obtained by the intersection of the corresponding optical paths in the four layers of optical path; Κ2 is obtained by the intersection of the corresponding optical paths in the five optical path layers; Κ3 is corresponding to the corresponding three optical paths The optical paths are intersected; Κ4 is obtained by intersecting the corresponding optical paths of the three optical path layers; Κ5 is obtained by intersecting the corresponding optical paths of the two optical path layers.

Therefore, it is determined that Κ5 is a false touch generation area, Κ2 is a true touch generation area; the other three polygons need to be further filtered; all light paths passing through K1 are detected, and the optical path F2 is found, and the optical path does not pass K2, so it is determined that K1 is true Touching the occurrence area; detecting all the optical paths passing through Κ3, and finding that all the optical paths pass through the polygon unit K1 or Κ2 which is determined to be the true touch generation area, so that Κ3 is determined as the false touch generation area; all the optical paths passing through Κ4 are detected, and the optical path Al is found. And since the optical path does not pass through the polygon single body determined to be the true touch generation area, it is determined that Κ4 is the true touch generation area.

Claims

Claim

A touch screen touch area localization method, comprising the following steps:

(1) Detecting all light paths and obtaining all blocked light paths;

The touch screen touch area localization method according to claim 1, wherein the step (1) and the step (2) further have the following steps: using an infrared emitting element to an infrared The optical path formed by the receiving component is the unit optical path, and the optical path obtained by the step (1) is all the blocked unit optical paths, and all blocked optical paths are detected. If there are adjacent unit optical paths in the same optical path layer Then, the adjacent unit optical paths are combined to form a group of optical path groups.

The touch screen touch area localization method according to claim 2, wherein the step (2) is specifically: converting the blocked unit light path and/or the optical path group into polygon data, that is, determining each The coordinates of the infrared emitting element and the infrared receiving element determine the coordinates of the apex of the blocked optical path.

The method for locating a touch screen touch area according to claim 1 or 2 or 3, wherein the step (4) further comprises a step of filtering a true touch area, the step comprising:

a. detecting all the polygons in the last set of polygons obtained by the step (4), determining that the polygons obtained by intersecting the most layers of the optical path layers are true touch generating regions; if the polygons are smaller than m layers When the optical path layers are intersected, it is determined that the polygon single body is a false touch generating region; m is smaller than the total number of optical path layers.

The touch screen touch area localization method according to claim 4, wherein the step of filtering the true touch area further comprises

b. If the polygons in the last group of polygons are obtained by intersecting the optical path layers of the m layer or more and less than the total optical path layer, detecting all blocked optical paths passing through the polygon, if there is a single through the polygon But does not pass the light of the polygonal element that has been determined to be the true touch occurrence area The road is determined to be a true touch generation area, and if it is not present, it is determined to be a false touch generation area.