System and method for unlocking an electronic device

• US 8,902,041 B2
• Filed: 08/14/2012
• Issued: 12/02/2014
• Est. Priority Date: 01/10/2012
• Status: Active Grant

• Current Assignee: Chi Mei Communication Systems Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Chi Mei Communication Systems Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Lai, Hsin-Chang, Chang, Han-Zen, Wu, Liu-Wei, Hou, Jiun-Ru
• Primary Examiner(s): Zimmerman, Brian
• Assistant Examiner(s): NGUYEN, LAURA N
• Application Number:
  US13/585,769
• Publication Number:
  US 20130176105A1
• Time in Patent Office: 840 Days
• Field of Search: 340/967, 340/467, 340/669, 340/686.1, 340/689, 345/156, 345/158, 455/411, 455/418, 455/419, 348/208.1, 348/208.2, 702150-153
• US Class Current: 340/5.51
• CPC Class Codes: G06F 21/36 by graphic or iconic representation

Abstract

In a method for unlocking an electronic device, unlocking operation having motion units are preset and are stored into a storage system. Sampled unlocking operation is stored into the storage system. When the electronic device receives a preset unlocking command to start unlocking the electronic device, three-axis acceleration values and three-axis rotation vectors are obtained continuously as an input operation from a first sensor and a second sensor. Motion units of the input operation are recorded. Sampled input operation is obtained by sampling the input operation at a preset time interval. A membership degree of the input operation is calculated. When the membership degree of the input operation conforms to a preset unlocking threshold, the electronic device is unlocked.

Claims

1. A computer-implemented method for unlocking an electronic device, the method comprising:

presetting a unlocking operation having motion units, each of the motion units comprising three-axis acceleration values and three-axis rotation vectors of the electronic device, the three-axis acceleration values being detected by a first sensor of the electronic device and the three-axis rotation vectors being detected by a second sensor of the electronic device;

sampling the unlocking operation at a preset time interval, and storing the sampled unlocking operation into a storage system of the electronic device;

obtaining the three-axis acceleration values and the three-axis rotation vectors continuously from the first sensor and the second sensor as an input operation, when the electronic device receives a preset unlocking command to unlock the electronic device;

recording motion units of the input operation;

sampling the input operation at the preset time interval as sampled input operation;

calculating a membership degree of the input operation according to a predetermined formula of a theory of fuzzy logic, the sampled unlocking operation, and the sampled input operation, wherein the membership degree is calculated according to an absolute value of a difference between a three-axis acceleration value of each motion unit in the sampled unlocking operation and a three-axis acceleration value of a corresponding motion unit in the sampled input operation, a triangular membership function of each of the absolute value, a vector difference between a three-axis rotation vector of each motion unit in the sampled unlocking operation and a three-axis rotation vector of the corresponding motion unit in the sampled input operation, and the triangular membership function of each vector difference;

unlocking the electronic device when the membership degree of the input operation conforms to a preset unlocking threshold.

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

prompting that the input operation is wrong and clearing the input operation, if the membership degree of the input operation does not conform to the preset unlocking threshold.

3. The method according to claim 1, wherein the preset unlocking threshold comprises a group of a lower level, a low level, a middle level, a higher level, and a high level, each level in the group corresponds to a range of the membership degrees.

4. The method according to claim 1, wherein a number of the motion units in the sampled unlocking operation is equal to a number of the motion units in the sampled input operation.

5. The method according to claim 1, wherein the first sensor is a three-axis acceleration sensor, and the second sensor is a three-axis gyroscope.

6. A non-transitory storage medium storing a set of instructions, when executed by at least one processor of an electronic device, cause the at least one processor to perform a method for unlocking the electronic device, the method comprising:

presetting an unlocking operation having motion units, each of the motion units comprising three-axis acceleration values and three-axis rotation vectors of the electronic device, the three-axis acceleration values being detected by a first sensor of the electronic device and the three-axis rotation vectors being detected by a second sensor of the electronic device;

sampling the unlocking operation at a preset time interval, and storing the sampled unlocking operation into a storage system of the electronic device;

obtaining the three-axis acceleration values and the three-axis rotation vectors continuously from the first sensor and the second sensor as an input operation, when the electronic device receives a preset unlocking command to unlock the electronic device;

recording the motion units of the input operation;

sampling the input operation at the preset time interval as sampled input operation;

calculating a membership degree of the input operation according to a predetermined formula of a theory of fuzzy logic, the sampled unlocking operation and the sampled input operation, wherein the membership degree is calculated according to an absolute value of a difference between a three-axis acceleration value of each motion unit in the sampled unlocking operation and a three-axis acceleration value of a corresponding motion unit in the sampled input operation, a triangular membership function of each of the absolute value, a vector difference between a three-axis rotation vector of each motion unit in the sampled unlocking operation and a three-axis rotation vector of the corresponding motion unit in the sampled input operation, and the triangular membership function of each vector difference;

unlocking the electronic device when the membership degree of the input operation conforms to a preset unlocking threshold.

7. The non-transitory storage medium according to claim 6, further comprising:

prompting that the input operation is wrong and clearing the input operation, if the membership degree of the input operation does not conform to the preset unlocking threshold.

8. The non-transitory storage medium according to claim 6, wherein the preset unlocking threshold comprises a group of a lower level, a low level, a middle level, a higher level, and a high level, each level in the group corresponds to a range of the membership degrees.

9. The non-transitory storage medium according to claim 6, wherein a number of the motion units in the sampled unlocking operation is equal to a number of the motion units in the sampled input operation.

10. The non-transitory storage medium according to claim 6, wherein the first sensor is a three-axis acceleration sensor, and the second sensor is a three-axis gyroscope.

11. An electronic device, comprising:

a first sensor for detecting three-axis acceleration values and a second sensor for detecting three-axis rotation vectors of the electronic device;

a storage system;

at least one processor; and

one or more programs that are stored in the storage system and executed by the at least one processor, the one or more programs comprising;

a setting module that presets an unlocking operation having motion units, each of the motion units comprising the three-axis acceleration values and the three-axis rotation vectors of the electronic device;

a sampling module that samples the unlocking operation at a preset time interval, and stores the sampled unlocking operation into the storage system;

an acquisition module that obtains the three-axis acceleration values and the three-axis rotation vectors continuously from the first sensor and the second sensor as an input operation, when the electronic device receives a preset unlocking command to unlock the electronic device;

a recording module that records the motion units of the input operation;

the sampling module further samples the input operation at the preset time interval as sampled input operation;

a calculation module that calculates a membership degree of the input operation according to a predetermined formula of a theory of fuzzy logic, the sampled unlocking operation and the sampled input operation, wherein the membership degree is calculated according to an absolute value of a difference between a three-axis acceleration value of each motion unit in the sampled unlocking operation and a three-axis acceleration value of a corresponding motion unit in the sampled input operation, a triangular membership function of each of the absolute value, a vector difference between a three-axis rotation vector of each motion unit in the sampled unlocking operation and a three-axis rotation vector of the corresponding motion unit in the sampled input operation, and the triangular membership function of each vector difference;

a processing module that unlocks the electronic device when the membership degree of the input operation conforms to a preset unlocking threshold.

12. The electronic device according to claim 11, wherein the processing module further prompting that the input operation is wrong and clearing the input operation, if the membership degree of the input operation does not conform to the preset unlocking threshold.

13. The electronic device according to claim 11, wherein the preset unlocking threshold comprises a group of a lower level, a low level, a middle level, a higher level, and a high level, each level in the group corresponds to a range of the membership degrees.

14. The electronic device according to claim 11, wherein a number of the motion units in the sampled unlocking operation is equal to a number of the motion units in the sampled input operation.

15. The electronic device according to claim 11, wherein the first sensor is a three-axis acceleration sensor and the second sensor is a three-axis gyroscope.