High accuracy digitizer system
First Claim
1. A high accuracy digitizer system for determining the position of a pointer relative to a tablet comprising:
- a tablet having a positional grid thereon, said positional grid having positional inaccuracies therein;
location means for determining the coarse position of said pointer relative to said tablet utilizing said positional grid on said tablet; and
error correction means containing information regarding said positional inaccuracies in said positional grid and coupled to said location means for receiving said coarse position from said location means and for generating the true position of said pointer relative to said tablet.
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Accused Products
Abstract
A high accuracy digitizer system for determining the position of a pointer relative to a tablet comprising a tablet having a positional grid thereon, a processor for determining the coarse position of the pointer relative to the tablet, and an error correction system for generating the true position of the pointer relative to the tablet. In a particular embodiment, the pointer includes an electromagnetic transducer for inducing a signal in the positional grid and the processor is coupled to the positional grid for sensing the signal and generating the coarse position of the pointer. The error correction system receives the coarse position from the processor and generates a true position, the positional grid containing positional inaccuracies therein and the error correction system correcting for such inaccuracies.
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Citations
10 Claims
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1. A high accuracy digitizer system for determining the position of a pointer relative to a tablet comprising:
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a tablet having a positional grid thereon, said positional grid having positional inaccuracies therein; location means for determining the coarse position of said pointer relative to said tablet utilizing said positional grid on said tablet; and error correction means containing information regarding said positional inaccuracies in said positional grid and coupled to said location means for receiving said coarse position from said location means and for generating the true position of said pointer relative to said tablet. - View Dependent Claims (2, 3, 4, 5)
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6. The method of producing a high accuracy digitizer system for determining the position of a pointer relative to a tablet having a positional grid thereon comprising:
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placing a pointer in a plurality of selected positions over said positional grid; generating a plurality of determined positions of said pointer from said positional grid correlating to said selected positions; measuring the position of said pointer for each of said selected positions to generate a plurality of measured positions; comparing each of said determined positions with each of said measured positions to determine deviations therefrom; and generating an error correction system from said deviations for use with said tablet to produce said high accuracy digitizer system. - View Dependent Claims (7, 8, 9, 10)
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Specification