Method for authenticating capacitive touch

• US 10,175,828 B2
• Filed: 10/08/2014
• Issued: 01/08/2019
• Est. Priority Date: 10/08/2013
• Status: Active Grant

• Current Assignee: 12CM Global Pte. Ltd.
• Original Assignee: 12CM Global Pte. Ltd.
• Inventors: Han, Jeong-Gyoun, Kim, Jae-Hyung
• Primary Examiner(s): Jansen, II, Michael J
• Application Number:
  US14/653,851
• Publication Number:
  US 20150355750A1
• Time in Patent Office: 1,553 Days
• CPC Class Codes: G06F 21/36 by graphic or iconic representation
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/04186 Touch location disambiguation
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

A method for authenticating capacitive touch, executed through a system interworking with a capacitive touch screen supporting multi-touch, comprises receiving touch point information for touch points recognized as multi-touch through the capacitive touch screen, reading the touch point information and identifying a specified touch point corresponding to any one specified touch portion fixed and arranged in a previously specified position in design among touch portions of a touch device in which capacitively touchable touch portions are arranged according to a previously designed unique geometric relationship, coordinate-rotating the touch points or a geometric relationship for the touch points to match a designed geometric relationship based on a reference point corresponding to the specified touch point, and authenticating whether the coordinate-rotated geometric relationship matches the designed geometric relationship within a tolerance range or identifying the designed geometric relationship matching the coordinate-rotated geometric relationship within a tolerance range among the designed geometric relationships.

Claims

1. A method for authenticating capacitive touch that is executed through a system interworking with a capacitive touch screen that supports multi-touch and storing designed geometric relationships for arranging a plurality of touch portions in a unique geometric relationship on a touch device that is to be touched in a capacitive touch screen, the method comprising:

receiving touch point information about a plurality of touch points recognized as multi-touch through the capacitive touch screen;

reading the touch point information and identifying one of the recognized touch points which corresponds to a reference point associated with a predetermined touch portion arranged in a predetermined position among the plurality of touch portions arranged in one of the designed geometric relationships on the touch device, wherein the touch device comprises a plurality of division areas in which the touch portions are arranged, and the identifying the one of the recognized touch points which corresponds to the reference point comprises identifying the reference point by using the number of the touch portions arranged in each of the division areas;

rotating coordinates of the recognized touch points or a geometric relationship for the recognized touch points based on the identified touch point corresponding to the reference point; and

authenticating whether the rotated touch points or geometric relationship matches one of the stored designed geometric relationships within a tolerance range or identifying a geometric relationship matching the rotated touch points or geometric relationship within a tolerance range among the stored designed geometric relationships.

2. The method according to claim 1, wherein the touch point information includes a coordinate value in a coordinate system set in the capacitive touch screen in which the plurality of touch points are recognized as multi-touch.

3. The method according to claim 1, wherein the designed geometric relationship includes at least one of a distance relationship and an angular relationship between center points of the respective touch portions.

4. The method according to claim 1, wherein the designed geometric relationship includes at least one of a distance relationship and an angular relationship between the center point of the predetermined touch portion and the center point of the other touch portions.

5. The method according to claim 1, wherein the designed geometric relationship includes at least one of the distance relationship and the angular relationship between a coordinate origin identified using the predetermined touch point and the center point of each touch portion.

6. The method according to claim 1, wherein the reference point includes the predetermined touch point or a coordinate origin identified using the predetermined touch point.

7. The method according to claim 1, wherein the geometric relationship for the plurality of touch points includes at least one of a distance relationship and an angular relationship between the respective touch points.

8. The method according to claim 1, wherein the geometric relationship for the plurality of touch points includes at least one of a distance relationship and an angular relationship between the predetermined touch point and the other touch points.

9. The method according to claim 1, wherein the geometric relationship for the plurality of touch points includes at least one of a distance relationship and an angular relationship between a coordinate origin identified using the predetermined touch point and each touch point.

10. The method according to claim 7, wherein the distance relationship includes a coordinate distance in a coordinate system for reading the geometric relationship.

11. The method according to claim 7, wherein the angular relationship includes a coordinate angle in a coordinate system for reading the geometric relationship.

12. The method according to claim 1, further comprising:

coordinate-transforming the touch point information to a coordinate system corresponding to the designed geometric relationship.

13. The method according to claim 1, further comprising:

authenticating whether the number of touch points included in the touch point information matches the number of touch portions in design.

14. The method according to claim 1, further comprising:

reading mutual position relationship between the respective touch points and authenticating whether the plurality of touch points are touch points of a valid touch device.

15. The method according to claim 14, further comprising:

authenticating whether a distance between the respective touch points is equal to or greater than a minimum distinction recognition distance set in design.

16. The method according to claim 14, wherein the reading the mutual position relationship between the respective touch points and the authenticating whether the plurality of touch points are the touch points of the valid touch device includes authenticating whether a maximum spacing distance among distances between the respective touch points is smaller than a maximum spacing distance set in design.

17. The method according to claim 14, wherein the reading the mutual position relationship between the respective touch points and the authenticating whether the plurality of touch points are the touch points of the valid touch device includes authenticating whether a polygonal geometric characteristic formed by segments connecting the respective touch points includes a polygonal geometric characteristic capable of being formed by connecting center points of the touch portions arranged in the touch device.

18. The method according to claim 1, wherein the receiving the touch point information includes reading the geometric structure of the touch points corresponding to the touch point information based on a designed geometric structure condition for arranging a plurality of touch portions in a flat plate area of a frame portion included in the touch device, and identifying a specified touch point fixed and arranged in a specified position within the flat plate area.

19. The method according to claim 1,

wherein the designed geometric relationship includes a relationship in which the touch portions are positioned at calculated positions in n-division areas (n≥

4) partitioned in design, respectively, and one touch portion is fixed in a designated position in one designated area out of the n-division areas, and

the receiving the touch point information includes confirming a specified area including two touch points among the n-division areas by reading the touch point information based on the division area information in design, and identifying a specified touch point corresponding to a specified position within the confirmed specified area.

20. The method according to claim 1, further comprising:

coordinate-transforming the predetermined touch point and other touch points into a coordinate system corresponding to the designed geometric relationship upon identifying the predetermined touch point.

21. The method according to claim 1, further comprising:

calculating a geometric relationship of the rotated touch points.

22. The method according to claim 1, further comprising:

coordinate-transforming the calculated geometric relationship into a coordinate system corresponding to the designed geometric relationship upon calculating the geometric relationship.

23. The method according to claim 1,

wherein the system is implemented through a user device including the capacitive touch screen, implemented on a server communicating with the user device including the capacitive touch screen, or implemented on the user device including the capacitive touch screen and the server in a distributed manner.

24. The method of claim 1, wherein the number of touch portions arranged in one division area having the reference point is different from the number of touch portions arranged in other division areas that do not have the reference point.

25. The method of claim 24, wherein two or more touch portions are disposed in the one division having the reference point and one touch portion is disposed in each of the other division areas that do not have the reference point.

26. The method of claim 1, wherein the identifying the one of the recognized touch points which corresponds to the reference point comprises identifying the reference point by using a polygonal shape which is formed by connecting the recognized touch points.

27. The method of claim 1, wherein the identifying the one of the recognized touch points which corresponds to the reference point comprises identifying the reference point by using an angle formed by three touch points which are adjacently located among the plurality of touch points.

28. The method of claim 1, wherein the designed geometric relationships previously registered in the system.