Image jaggedness filter for determining whether to perform baseline calculations
First Claim
1. A method of delaying a periodic baseline adjustment of a plurality of touch sensor outputs on a touch sensor panel until objects having a high spatial frequency have been substantially removed from the touch sensor panel, comprising:
- computing a jaggedness measure for at least a portion of the plurality of touch sensor outputs based on a plurality of computed differences between the portion of the plurality of touch sensor outputs, the plurality of computed differences including differences between each of the touch sensor outputs in the portion and at least one other touch sensor output in the portion; and
delaying or performing the periodic baseline adjustment of the plurality of touch sensor outputs based at least in part on the jaggedness measure.
1 Assignment
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Accused Products
Abstract
An image jaggedness filter is disclosed that can be used to detect the presence of ungrounded objects such as water droplets or coins, and delay periodic baseline adjustments until these objects are no longer present. To do otherwise could produce inaccurate normalized baseline sensor output values. The application of a global baseline offset is also disclosed to quickly modify the sensor offset values to account for conditions such as rapid temperature changes. Background pixels not part of any touch regions can be used to detect changes to no-touch sensor output values and globally modify the sensor offset values accordingly. The use of motion dominance ratios and axis domination confidence values is also disclosed to improve the accuracy of locking onto dominant motion components as part of gesture recognition.
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Citations
25 Claims
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1. A method of delaying a periodic baseline adjustment of a plurality of touch sensor outputs on a touch sensor panel until objects having a high spatial frequency have been substantially removed from the touch sensor panel, comprising:
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computing a jaggedness measure for at least a portion of the plurality of touch sensor outputs based on a plurality of computed differences between the portion of the plurality of touch sensor outputs, the plurality of computed differences including differences between each of the touch sensor outputs in the portion and at least one other touch sensor output in the portion; and delaying or performing the periodic baseline adjustment of the plurality of touch sensor outputs based at least in part on the jaggedness measure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A non-transitory computer-readable storage medium storing program code for delaying a periodic baseline adjustment of a plurality of sensor outputs on a touch sensor panel until objects having a high spatial frequency have been substantially removed from the touch sensor panel, the program code for causing performance of a method comprising:
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determining a jaggedness measure of an obtained image of touch based on a plurality of computed differences between at least a portion of the plurality of touch sensor outputs in the image of touch, the plurality of computed differences including differences between each of the touch sensor outputs in the portion and at least one other touch sensor output in the portion; and delaying or performing the periodic baseline adjustment of the plurality of touch sensor outputs based at least in part on the degree of spatial frequency. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A mobile telephone including a non-transitory computer-readable storage medium storing program code for delaying a periodic baseline adjustment of a plurality of touch sensor outputs on a touch sensor panel until objects having a high spatial frequency have been substantially removed from the touch sensor panel, the program code for causing performance of a method comprising:
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computing a jaggedness measure for at least a portion of the plurality of touch sensor outputs based on a plurality of computed differences between the portion of the plurality of touch sensor outputs, the plurality of computed differences including differences between each of the touch sensor outputs in the portion and at least one other touch sensor output in the portion; and delaying or performing the periodic baseline adjustment of the plurality of touch sensor outputs based at least in part on the jaggedness measure.
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24. A media player including a non-transitory computer-readable storage medium storing program code for delaying a periodic baseline adjustment of a plurality of sensor outputs on a touch sensor panel until objects having a high spatial frequency have been substantially removed from the touch sensor panel, the program code for causing performance of a method comprising:
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computing a jaggedness measure for at least a portion of the plurality of touch sensor outputs based on a plurality of computed differences between the portion of the plurality of touch sensor outputs, the plurality of computed differences including differences between each of the touch sensor outputs in the portion and at least one other touch sensor output in the portion; and delaying or performing the periodic baseline adjustment of the plurality of touch sensor outputs based at least in part on the jaggedness measure.
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25. A personal computer including a non-transitory computer-readable storage medium storing program code for delaying a periodic baseline adjustment of a plurality of sensor outputs on a touch sensor panel, until objects having a high spatial frequency have been substantially removed from the touch sensor panel, the program code for causing performance of a method comprising:
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computing a jaggedness measure for at least a portion of the plurality of touch sensor outputs based on a plurality of computed differences between the portion of the plurality of touch sensor outputs, the plurality of computed differences including differences between each of the touch sensor outputs in the portion and at least one other touch sensor output in the portion; and delaying or performing the periodic baseline adjustment of the plurality of touch sensor outputs based at least in part on the jaggedness measure.
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Specification