MULTI-TOUCH INPUT DISCRIMINATION
First Claim
Patent Images
1. A method to identify an input to a touch-surface device, comprising:
- obtaining a proximity image;
segmenting the proximity image to identify one or more patches;
generating a proximity sensor signal when an object is proximate the proximity sensor; and
determining a signal density value for at least one of the one or more patches; and
using the signal density value and the proximity sensor signal to determine the existance of an object adjacent to or in contact with the touch surface device.
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Abstract
Techniques for identifying and discriminating between different types of contacts to a multi-touch touch-screen device are described. Illustrative contact types include fingertips, thumbs, palms and cheeks. By way of example, thumb contacts may be distinguished from fingertip contacts using a patch eccentricity parameter. In addition, by non-linearly deemphasizing pixels in a touch-surface image, a reliable means of distinguishing between large objects (e.g., palms) from smaller objects (e.g., fingertips, thumbs and a stylus) is described.
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Citations
14 Claims
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1. A method to identify an input to a touch-surface device, comprising:
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obtaining a proximity image; segmenting the proximity image to identify one or more patches; generating a proximity sensor signal when an object is proximate the proximity sensor; and determining a signal density value for at least one of the one or more patches; and using the signal density value and the proximity sensor signal to determine the existance of an object adjacent to or in contact with the touch surface device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A touch-surface device, comprising:
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a memory for storing a proximity image of a touch surface of the touch-surface device; a processor operative for; segmenting the proximity image to identify one or more patches; generating a proximity sensor signal when an object is proximate the proximity sensor; and determining a signal density value for at least one of the one or more patches; and using the signal density value and the proximity sensor signal for determining the existance of an object adjacent to or in contact with the touch surface device.
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Specification