Coordinate input device and method having first and second sampling devices which sample input data at staggered intervals
First Claim
1. A coordinate input device comprising:
- first sampling means for sampling coordinate data with a predetermined cycle to provide first sample data;
second sampling means for sampling the coordinate data at least at one moment staggered by a predetermined period from the time when said first sampling means sampled the coordinate data to provide second sample data;
generating means for generating additional data based on predetermined relationship between the first sample data and the second sample data; and
output means for providing output data based on the first sample data and the additional data, wherein the additional data includes information of a change of the coordinate data.
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Abstract
A coordinate input device interpolates sampling data, using less input data and simpler computing. The input data (coordinate information indicative of an input trace) are sampled both with a predetermined cycle (Tn), and at the end of a predetermined time interval after the sampling of the cycle Tn is complete. As a result of the two different samplings, not only the coordinate point determined by the sampling of cycle Tn, but also information indicative of a tangent vector at each coordinate point on the input trace are obtained. The coordinate point and the associated tangent vector information are thus output, so that a trace more faithful to the input trace is obtained using fewer coordinate points.
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Citations
15 Claims
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1. A coordinate input device comprising:
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first sampling means for sampling coordinate data with a predetermined cycle to provide first sample data;
second sampling means for sampling the coordinate data at least at one moment staggered by a predetermined period from the time when said first sampling means sampled the coordinate data to provide second sample data;
generating means for generating additional data based on predetermined relationship between the first sample data and the second sample data; and
output means for providing output data based on the first sample data and the additional data, wherein the additional data includes information of a change of the coordinate data. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A coordinate input method comprising:
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a first sampling step of sampling coordinate data with a predetermined cycle to provide first sample data;
a second sampling step of sampling the coordinate data at least at one moment staggered by a predetermined period from the time when said coordinate data was sampled at said first sampling step to provide second sample data;
a generating step of generating additional data based on a predetermined relationship between the first sample data and the second sample data; and
an output step of providing output data based on the first sample data and the additional data, wherein the additional data includes information of a change of the coordinate data. - View Dependent Claims (8, 9, 10)
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11. A coordinate input device comprising:
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first sampling means for sampling coordinate data with a predetermined cycle, the coordinate data representing a position of each coordinate point on a coordinate trace;
second sampling means for sampling said coordinate data at least at one moment staggered by a predetermined period from the time when said first sampling means sampled said coordinate data;
generating means for generating additional data for each sampling data obtained by said first sampling means based on sampling data obtained by said first and second sampling means; and
formation means for forming an output trace based on input points sampled by said first sampling means and the additional data generated by said generating means, wherein the additional data includes information of a change of coordinate data.
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12. A computer readable medium having recorded thereon codes for implementing a computer implementable coordinate input method comprising:
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a first sampling step of sampling coordinate data with a predetermined cycle to provide first sample data;
a second sampling step of sampling the coordinate data at least at one moment staggered by a predetermined period from the time when said coordinate data was sampled at said first sampling step to provide second sample data;
a generating step of generating additional data based on a predetermined relationship between the first sample data and the second sample data; and
an output step of providing output data based on the first sample data and the additional data, wherein the additional data includes information of a change of the coordinate data. - View Dependent Claims (13, 14, 15)
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Specification