Title:
【発明の名称】デジタイザ・タブレット並びにタブレット表面に対するポインティング手段の位置及び角度を決定する方法
Document Type and Number:
Japanese Patent JPH0738151
Kind Code:
B2
Abstract:
A digitizer tablet (10) has an array of conductors that define a sensing plane (12) for sensing an electromagnetic signal generated by a pointing device (16) disposed external to the plane. The tablet includes circuitry, coupled to the array of conductors, for determining a magnitude of an electrical signal or signals induced within the array of conductors by the pointing device. The tablet also includes a data processor (30) that is responsive to the determined magnitude for accurately estimating both a position and an angular orientation of the pointing device relative to a coordinate system associated with the sensing plane. A first position estimate derived from a zero-crossing estimator is used to position a weighting function, which is employed in a weighted least squares fit of a line to the data, resulting in a second zero-crossing estimate of the position of the pointing device. On this second position estimate another weighting function is centered and a tilt estimation is obtained. The tilt estimation is employed to derive a correction for the position estimate.
Inventors:
Gregory Fraser Russell
Application Number:
JP10511892A
Publication Date:
April 26, 1995
Filing Date:
April 24, 1992
Export Citation:
Assignee:
International Business Machines Corporation
International Classes:
G06F3/046; G06F3/033; G06F3/041; G06F3/048; G06F3/0488; G06K11/06; (IPC1-7): G06F3/03; G06F3/03; G06K11/06
Domestic Patent References:
| JP384618A | ||||
| JP312726A | ||||
| JP57212528A | ||||
| JP3191416A |
Attorney, Agent or Firm:
Koichi Tonmiya (4 outside)
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