Coordinate input apparatus and control method and program therefor
First Claim
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1. A coordinate input apparatus for generating coordinates corresponding a light irradiated from a pointing device, comprising:
- detection means for detecting the light irradiated from the pointing device;
storage means for storing output information from said detection means for at least at three known positions including first to third positions of the light irradiated from the pointing device;
calculation means for calculating coordinate values corresponding to the light using two of the pieces of said output information at said first and said second positions, which are stored in said storage means; and
correction means for correcting the coordinate values calculated by said calculation means to generate final coordinate values corresponding to the light using said output information at a said third position, only when said coordinate values calculated by said calculation means fall inside a predetermined region defined by the first to third positions.
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Abstract
A light irradiated on a coordinate input screen from a pointing device is detected, and pieces of output information obtained as detection results for light at least at three known positions including first to third positions are stored. The coordinate values of the light formed on the coordinate input screen are calculated using at least two of the stored pieces of output information at the first to third positions.
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Citations
13 Claims
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1. A coordinate input apparatus for generating coordinates corresponding a light irradiated from a pointing device, comprising:
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detection means for detecting the light irradiated from the pointing device;
storage means for storing output information from said detection means for at least at three known positions including first to third positions of the light irradiated from the pointing device;
calculation means for calculating coordinate values corresponding to the light using two of the pieces of said output information at said first and said second positions, which are stored in said storage means; and
correction means for correcting the coordinate values calculated by said calculation means to generate final coordinate values corresponding to the light using said output information at a said third position, only when said coordinate values calculated by said calculation means fall inside a predetermined region defined by the first to third positions. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control method for a coordinate input apparatus for irradiating a coordinate input screen with light from a pointing device, and generating coordinates corresponding to the light, comprising:
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the detection step of detecting the light irradiated on the coordinate input screen from the pointing device; and
the calculation step of calculating coordinate values of the light irradiated on the coordinate input screen using at least two of pieces of output information at least at three known positions including first to third positions of the light irradiated from the pointing device in the detection step; and
a correction step for correcting the coordinate values calculated by said calculation step to generate final coordinate values corresponding to the light using output information at a third position, when coordinate values calculated by said calculation step correspond to a predetermined region defined by the first to third positions. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A program for causing a computer to control a coordinate input apparatus for irradiating a coordinate input screen with light from a pointing device, and generating coordinates corresponding to the light, comprising:
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a program code of the detection step of detecting the light irradiated on the coordinate input screen from the pointing device; and
a program code of the calculation step of calculating coordinate values of the light irradiated on the coordinate input screen using at least two of pieces of output information at least at three known positions of light irradiated from the pointing device, including first to third positions in the detection step; and
a program code of a correction step for correcting coordinate values output by program code of the calculation step to generate final coordinate values corresponding to the light using output information at a third position, when coordinate values calculated by said program code of the calculations step correspond to a predetermined region defined by the first to third positions.
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Specification