Ellipse Fitting for Multi-Touch Surfaces
First Claim
Patent Images
1. A method of processing input from a touch-sensitive surface, the method comprising:
- receiving at least one proximity image representing a scan of a plurality of electrodes of the touch-sensitive surface;
segmenting each proximity image into one or more pixel groups that indicate significant proximity, each pixel group representing proximity of a distinguishable hand part or other touch object on or near the touch-sensitive surface; and
fitting an ellipse to at least one of the pixel groups.
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Abstract
Apparatus and methods are disclosed for simultaneously tracking multiple finger and palm contacts as hands approach, touch, and slide across a proximity-sensing, multi-touch surface. Identification and classification of intuitive hand configurations and motions enables unprecedented integration of typing, resting, pointing, scrolling, 3D manipulation, and handwriting into a versatile, ergonomic computer input device.
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Citations
35 Claims
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1. A method of processing input from a touch-sensitive surface, the method comprising:
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receiving at least one proximity image representing a scan of a plurality of electrodes of the touch-sensitive surface;
segmenting each proximity image into one or more pixel groups that indicate significant proximity, each pixel group representing proximity of a distinguishable hand part or other touch object on or near the touch-sensitive surface; and
fitting an ellipse to at least one of the pixel groups. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 23)
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10. A touch-sensing device comprising:
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a substrate;
a plurality of touch-sensing electrodes arranged on the substrate;
electronic scanning hardware adapted to read the plurality of touch-sensing electrodes;
a calibration module operatively coupled to the electronic scanning hardware and adapted to construct a proximity image having a plurality of pixels corresponding to the touch-sensing electrodes; and
a contact tracking and identification module adapted to;
segment the proximity image into one or more pixel groups, each pixel group representing proximity of a distinguishable hand part or other touch object on or near the touch-sensitive surface; and
fit an ellipse to at least one of the one or more pixel groups. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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24. A touch-sensing device comprising:
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means for producing a proximity image representing a scan of a plurality of electrodes of a touch-sensitive surface, the proximity image having a plurality of pixels corresponding to the touch-sensing electrodes; and
means for segmenting the proximity image into one or more pixel groups, each pixel group representing a touch object on or near the touch-sensitive surface; and
means for fitting an ellipse to at least one of the pixel groups. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification