Coordinate detection apparatus and method, and computer program
First Claim
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1. A coordinate detection apparatus for detecting coordinates of a light-shielded position, comprising:
- input means for inputting output from light receiving means; and
detection means for detecting an obstacle, which exists in a first state, based on a first output from said light receiving means in the first state in which light projecting means projects light, for detecting abnormal light based on a second output from said light receiving means in a state in which said light projecting means does not project any light, and for detecting coordinates of a light-shielded position based on a third output from said light receiving means in a second state in which said light projecting means projects light.
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Abstract
A coordinate detection apparatus has a light projecting unit and light receiving unit, detects abnormal light based on the output from the light receiving unit in a state in which the light projecting unit does not project any light, and detects the coordinates of a light-shielded position based on the output from the light receiving unit in a state in which the light projecting unit projects light.
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Citations
27 Claims
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1. A coordinate detection apparatus for detecting coordinates of a light-shielded position, comprising:
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input means for inputting output from light receiving means; and detection means for detecting an obstacle, which exists in a first state, based on a first output from said light receiving means in the first state in which light projecting means projects light, for detecting abnormal light based on a second output from said light receiving means in a state in which said light projecting means does not project any light, and for detecting coordinates of a light-shielded position based on a third output from said light receiving means in a second state in which said light projecting means projects light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A coordinate detection apparatus for detecting coordinates of a light-shielded position, comprising:
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light projecting means; light receiving means; storage means for storing a first output value of said light receiving means in a first state in which said light projecting means projects light; and detection means for detecting an obstacle, which exists in the first state, based on the first output value of said light receiving means in the first state in which said light projecting means projects light; for detecting abnormal light, which is projected from a light source other than said light projecting means and is input to said light receiving means, in a second state in which said light projecting means projects light, based on a second output value of said light receiving means in the second state, and for detecting coordinates of a light-shielded position in the second state based on the second output value of said light receiving means in the second state in which said light projecting means projects light, and the first output value stored in said storage means. - View Dependent Claims (12, 13)
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14. A coordinate detection method for detecting coordinates of a light-shielded position in a coordinate detection apparatus having a light projection unit and a light receiving unit, comprising:
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an obstacle detection step of detecting an obstacle, which exists in a first state, based on a first output from said light receiving means in the first state in which light projecting means projects light; an abnormal light detection step of detecting abnormal light based on a second output from the light receiving unit in a state in which the light projecting unit does not project any light; and a coordinate detection step of detecting coordinates of a light-shielded position based on a third output from the light receiving unit in a second state in which the light projecting unit projects light. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A coordinate detection method for detecting coordinates of a light-shielded position in a coordinate detection apparatus having a light projection unit and a light receiving unit, comprising:
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a storage step of storing, in a storage medium, a first output value of the light receiving unit in a first state in which the light projecting unit projects light; an obstacle detection step of detecting an obstacle, which exists in the first state, based on the first output value of the light receiving unit in the first state in which the light projecting unit projects light, an abnormal light detection step of detecting abnormal light, which is projected from a light source other than the light projecting unit and is input to the light receiving unit, in a second state in which the light projecting unit projects light, based on a second output value of the light receiving unit in the second state; and a coordinate detection step of detecting coordinates of a light-shielded position in the second state based on the second output value of the light receiving unit in the second state in which the light projecting unit projects light, and the first output value stored in the storage medium in the storage step. - View Dependent Claims (21, 22)
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23. A storage medium storing a computer program for making a coordinate detection apparatus, having a light projection unit and a light receiving unit, detect coordinates of a light-shielded position, said computer program comprising:
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an obstacle detection step of detecting an obstacle, which exists in a first state, based on a first output from said light receiving means in the first state in which light projecting means projects light; an abnormal light detection step of detecting abnormal light based on a second output from the light receiving unit in a state in which the light projecting unit does not project any light; and a coordinate detection step of detecting coordinates of a light-shielded position based on a third output from the light receiving unit in a second state in which the light projecting unit projects light. - View Dependent Claims (24, 25)
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26. A storage medium storing a computer program for making a coordinate detection apparatus, having a light projection unit and a light receiving unit, detect coordinates of a light-shielded position, said computer program comprising:
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a storage step of storing, in a storage medium, a first output value of the light receiving unit in a first state in which the light projecting unit projects light; an obstacle detection step of detecting an obstacle, which exists in the first state, based on the first output value of the light receiving unit in the first state in which the light projecting unit projects light; an abnormal light detection step of detecting abnormal light, which is projected from a light source other than the light projecting unit and is input to the light receiving unit, in a second state in which the light projecting unit projects light, based on a second output value of the light receiving unit in the second state; and a coordinate detection step of detecting coordinates of a light-shielded position in the second state based on the second output value of the light receiving unit in the second state in which the light projecting unit projects light, and the first output value stored in the storage medium in the storage step. - View Dependent Claims (27)
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Specification