Multi-touch input device with orientation sensing

1. An input device, comprising:

a multi-touch sensor that at least partially encloses a body of the input device and that senses one or more contacts with the body;

an inertia measurement unit that is attached to the body and that at least measures a tilt angle of the body with respect to a horizontal surface and a roll angle of the body along a length-wise axis of the body with respect to an initial point on the body;

determining a difference angle between the roll angle of the body and a standardized roll angle of a plurality of grip templates, each grip template having a corresponding grip pattern that represents a corresponding grip on the input device and a corresponding tilt angle of the input device; and

comparing the tilt angle and the difference angle to each of the plurality of grip templates to determine a grip pattern that corresponds to a predefined function.

2. The input device of claim 1 , further comprising a pressure switch that is activated by a retractable tip or a clickable button that is housed in the body.

3. The input device of claim 2 , wherein the input device is a pen-shaped stylus that includes the retractable tip at a first end and the clickable button at a second end.

4. The input device of claim 1 , further comprising a transceiver to transmit data related to the one or more contacts, the tilt angle, and the roll angle to another electronic device.

5. The input device of claim 1 , wherein the inertia measurement unit includes at least one of an accelerometer, a compass, or a gyroscope.

6. The input device of claim 1 , wherein the multi-touch sensor includes a plurality of capacitive sensing elements.

7. A computer-readable storage device storing computer-executable instructions that, when executed, cause one or more processors to perform acts comprising:

receiving multi-touch sensor data that indicates an instance of contact with a body of an input device, and an associated roll angle and an associated tilt angle of the body for the instance of contact;

generating a multi-touch input image based at least on the multi-touch sensor data;

determining a difference angle between the associated roll angle and a standardized roll angle of a plurality of grip templates, each grip template having a corresponding grip pattern that represents a corresponding grip on the input device and a corresponding tilt angle of the input device;

normalizing the multi-touch input image based at least on the difference angle to generate a normalized multi-touch input image; and

comparing the normalized multi-touch input image and the associated tilt angle to each of the plurality of grip templates to determine a grip pattern that corresponds to the normalized multi-touch input image.

8. The computer-readable storage device of claim 7 , further comprising instructions that, when executed, cause the one or more processors to perform an act of indicating a lack of grip pattern detection when the normalized multi-touch input image and the associated tilt angle does not match corresponding grips and corresponding tilt angles included in the grip templates.

9. The computer-readable storage device of claim 7 , further comprising instructions that, when executed, cause the one or more processors to perform an act of assigning a grip pattern of a particular grip template to the normalized multi-touch input image when the normalized multi-touch input image and the associated tilt angle matches a grip and a tilt angle included in the particular grip template.

10. The computer-readable storage device of claim 9 , further comprising instructions that, when executed, cause the one or more processors to perform acts comprising:

determining a function based at least on the grip pattern assigned to the multi-touch input image; and

performing the function determined at least from the grip pattern.

11. The computer-readable storage device of claim 10 , further comprising instructions that, when executed, cause the one or more processors to perform an act of receiving one or more additional inputs that includes at least one of a change in the roll angle of the input device, an activation of at least one pressure switch on the input device, a tilt angle of an electronic device that is connected to the input device, a rotation of the electronic device, movement sensed by a proximity sensor of the electronic device, an additional grip pattern from an additional input device that is connected to the electronic device, a tilt angle of the additional input device, or a change in the roll angle of the additional input device.

12. The computer-readable storage device of claim 11 , wherein the determining includes determining the function based on the grip pattern assigned to the multi-touch image and the one or more additional inputs.

13. The computer-readable storage device of claim 10 , wherein the function is to change a functionality of the input device with respect to a graphics illustration application, a game application, or a word processing application.

14. The computer-readable storage device of claim 7 , further comprising instructions that, when executed, cause the one or more processors to perform an act of creating a grip template by correlating an additional multi-touch input image and an additional tilt angle with a grip pattern.

15. A computer-implemented method, comprising:

receiving multi-touch sensor data that indicates one or more contact instances with a body of an input device;

generating multi-touch input image for each of the one or more contact instances based at least on the multi-touch sensor data, each multi-touch input image being correlated with a respective tilt angle and a roll angle of the body of the input device;

determining a corresponding difference angle between the roll angle for a multi-touch input image of the contact instance and a standardized roll angle of a plurality of grip templates;

determining a corresponding grip pattern that represents a corresponding way that a user holds the input device at a corresponding tilt angle and with a corresponding difference angle for each multi-touch input image; and

identifying a function to be performed using the input device based on at least one grip pattern.

16. The computer-implemented method of claim 15 , wherein determining the corresponding grip pattern further includes:

normalizing the multi-touch input image based at least on the corresponding difference angle;

matching the multi-touch input image and a particular tilt angle of the input device correlated with the multi-touch input image to a grip template of a plurality of grip templates, each of the grip templates including data on an associated grip on the input device and an associated tilt angle of the input device; and

assigning an associated grip pattern of a matching grip template from the plurality of templates to the multi-touch input image and the particular tilt angle.

17. The computer-implemented method of claim 15 , further comprising performing the function that is identified based on the at least one grip pattern.

18. The computer-implemented method of claim 15 , wherein the identifying includes identifying the function based on a specific sequence of grip patterns.

19. The computer-implemented method of claim 15 , wherein the function is to change a functionality of the input device with respect to a graphics illustration application, a game application, or a word processing application.

20. The computer-implemented method of claim 15 , further comprising receiving one or more additional inputs that includes at least one of a change in the roll angle of the input device, an activation of at least one pressure switch on the input device, a tilt angle of an electronic device that is connected to the input device, a rotation of the electronic device, movement sensed by a proximity sensor of the electronic device, an additional grip pattern from an additional input device that is connected to the electronic device, a tilt angle of the additional input device, or a change in the roll angle of the additional input device, and wherein the identifying includes identifying a function based on at least one grip pattern and the one or more additional inputs.