Title:
【発明の名称】光タッチ・パネル装置の表面領域における光学的欠陥の補償方法
Document Type and Number:
Japanese Patent JPH0731573
Kind Code:
B2
Abstract:
A method and apparatus that distinguish a valid touch from an optical aberration caused by unwanted objects and/or scratches in the light plane of an optical touch panel device are disclosed. During a training mode the device learns the relative position of "aberration dropouts" caused by the unwanted objects. During normal operating mode the relative positions of "touch and aberration dropouts" are generated and compared with the relative position of aberration dropouts to distinguish between aberration dropout signals and touch dropout signals. The touch dropout signals are subjected to further processing to determine the precise location of a touch while the aberration dropout signals are discarded.
Inventors:
Larry Allen Blue
Brass Todd Fredman
Jose Francisco Gonzalez-Jerez
Alexander Garland McInnis
Brass Todd Fredman
Jose Francisco Gonzalez-Jerez
Alexander Garland McInnis
Application Number:
JP20710489A
Publication Date:
April 10, 1995
Filing Date:
August 11, 1989
Export Citation:
Assignee:
INTERNATIONAL BUSINESS MASCHINES CORPORATION
International Classes:
G06F3/042; G06F3/033; G06F3/041; G06F3/048; G06F3/0488; G06K11/06; (IPC1-7): G06F3/03; G06F3/03
Domestic Patent References:
| JP62127929A |
Attorney, Agent or Firm:
Koichi Tonmiya (2 outside)
Next Patent: ホイールローダのリヤフェンダ装置