MULTI-TOUCH INPUT DISCRIMINATION
First Claim
Patent Images
1. A method to discriminate input sources to a touch-surface device, comprising:
- obtaining a proximity image including at least one patch;
determining one of a major axis radius value and a geometric mean radius value for the at least one patch;
identifying the at least one patch as being associated with a large object if the determined major axis radius value or geometric mean radius value of the at least one patch is above a first specified threshold; and
using the identified patch to control an operation of the touch-surface device.
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Abstract
Techniques for identifying and discriminating between different input patterns to a multi-touch touch-screen device are described. By way of example, large objects hovering a short distance from the touch-surface (e.g., a cheek, thigh or chest) may be identified and distinguished from physical contacts to the surface. In addition, rough contacts due to, for example, ears and earlobes, may be similarly identified and distinguished from contacts due to fingers, thumbs, palms and finger clasps.
155 Citations
26 Claims
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1. A method to discriminate input sources to a touch-surface device, comprising:
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obtaining a proximity image including at least one patch; determining one of a major axis radius value and a geometric mean radius value for the at least one patch; identifying the at least one patch as being associated with a large object if the determined major axis radius value or geometric mean radius value of the at least one patch is above a first specified threshold; and using the identified patch to control an operation of the touch-surface device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25)
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11. An apparatus for discriminating input sources to a touch surface device comprising:
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means for obtaining a proximity image including at least one patch; means for determining one of a major axis radius value and a geometric mean radius value for the at least one patch; means for identifying the at least one patch as being associated with a large object if the determined major axis radius value or geometric mean radius value of the at least one patch is above a first specified threshold; and means for using the identified patch to control an operation of the touch-surface device. - View Dependent Claims (12, 13, 14)
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24. A method to discriminate input sources to a touch-surface device, comprising:
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obtaining a proximity image including at least one patch; determining a size parameter value of a size parameter, the size parameter value indicative of a size of each of the plurality of patches; determining a signal density value for each of the plurality of patches; identifying the at least one patch as being associated with a large object if the determined size parameter value of the at least one patch is above a first specified threshold, the first specified threshold being a linear or non-linear relationship between signal density values and size parameter values; and using the identified patch to control an operation of the touch-surface device.
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26. An apparatus to discriminate input sources to a touch-surface device, comprising:
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means for obtaining a proximity image including at least one patch; means for determining a size parameter value of a size parameter, the size parameter value indicative of a size of each of the plurality of patches; means for determining a signal density value for each of the plurality of patches; means for identifying the at least one patch as being associated with a large object if the determined size parameter value of the at least one patch is above a first specified threshold, the first specified threshold being a linear or non-linear relationship between signal density values and size parameter values; and means for using the identified patch to control an operation of the touch-surface device.
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Specification