2318815 is referenced by 18 patents.

Apparatus and methods are disclosed for simultaneously tracking multiple finger (202-204) and palm (206, 207) contacts as hands approach, touch, and slide across a proximity-sensing, compliant, and flexible multi-touch surface (2). The surface consists of compressible cushion (32), dielectric electrode (33), and circuitry layers. A simple proximity transduction circuit is placed under each electrode to maximize the signal-to-noise ratio and to reduce wiring complexity. Scanning and signal off-set removal on electrode array produces low-noise proximity images. Segmentation processing of each proximity image constructs a group of electrodes corresponding to each distinguishable contacts and extracts shape, position and surface proximity features for each group. Groups in successive images which correspond to the same hand contact are linked by a persistent path tracker (245) which also detects individual contact touchdown and liftoff. 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.

Title
Procede et dispositif dintegration dentree manuelle
Method and apparatus for integrating manual input
Publication Number
2318815
Application Date
January 25, 1999
Publication Date
July 29, 1999
Inventor
Elias John G
Westerman Wayne
Agent
BORDEN LADNER GERVAIS
Assignee
Apple
Assignee
Elias John G
Westerman Wayne
IPC
G06T 07/20
G06F 03/033
G06F 03/03
G09G 05/00
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