INERTIAL MOUSE DEVICE AND ACCELERATION-CALIBRATING METHOD THEREOF
First Claim
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1. A calibrating method of an inertial mouse device, comprising steps of:
- discriminating whether the inertial mouse device is in a still state;
calculating a tilting angle θ
of the inertial mouse device relative to horizon according to an output of an accelerometer of the inertial mouse device when the inertial mouse device is in the still state;
calculating an acceleration according to the output of an accelerometer of the inertial mouse device and the titling angle θ
when the inertial mouse device is in a motional state; and
subtracting a value of g·
sinθ
, where g is gravity acceleration, from the calculated acceleration, thereby obtaining a calibrated acceleration.
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Abstract
An inertial mouse device includes a main body; an accelerometer unit disposed in the main body for performing a motion-sensing function of the main body with at least two degrees of freedom, and generating a calibration output value when the main body is in a still state; and a microprocessor in communication with the accelerometer unit, receiving and processing the calibration output value with an operation so as to obtain an angle of the accelerometer unit relative to horizon. The microprocessor generates a shift signal when the main body is in a motional state, and performs calibration for the shift signal according to the angle.
15 Citations
20 Claims
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1. A calibrating method of an inertial mouse device, comprising steps of:
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discriminating whether the inertial mouse device is in a still state; calculating a tilting angle θ
of the inertial mouse device relative to horizon according to an output of an accelerometer of the inertial mouse device when the inertial mouse device is in the still state;calculating an acceleration according to the output of an accelerometer of the inertial mouse device and the titling angle θ
when the inertial mouse device is in a motional state; andsubtracting a value of g·
sinθ
, where g is gravity acceleration, from the calculated acceleration, thereby obtaining a calibrated acceleration. - View Dependent Claims (2, 3)
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4. A calibrating method of an inertial mouse device, comprising steps of:
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discriminating whether the inertial mouse device is in a still state; calculating tilting angles θ
x and θ
y of the inertial mouse device relative to horizon in perpendicular X-axis and Y-axis according to calibration outputs of an accelerometer unit which performs a motion-sensing function of the inertial mouse device with two degrees of freedom when the inertial mouse device is in the still state;calculating accelerations ax and ay in an X-axis direction and a Y-axis direction according to the calibration outputs of the accelerometer unit and the tilting angles θ
x and θ
y; andsubtracting values of g·
sinθ
x and g·
sinθ
y, where g is gravity acceleration, from the calculated accelerations ax and ay, respectively, thereby obtaining calibrated accelerations in the X-axis direction and the Y-axis direction. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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13. An inertial mouse device, comprising:
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a main body; an accelerometer unit disposed in the main body for performing a motion-sensing function of the main body with at least two degrees of freedom, and outputting a calibration output value when the main body is in a still state; and a microprocessor in communication with the accelerometer, receiving and processing the calibration output value with an operation so as to obtain an angle of the accelerometer unit relative to horizon, generating a shift signal when the main body is in a motional state, and performing calibration for the shift signal according to the angle. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification