Coordinate input device working with at least display screen and desk-top surface as the pointing areas thereof
First Claim
1. A coordinate input device comprising:
- a pair of cameras positioned in an upper left position and an upper right position of a display screen of a monitor lying close to a plane extending from the display screen of the monitor and views both a side face of an object in contact with a position on the display screen and a predetermined desk-top coordinate detection area to capture the image of the object within a field of view, each of the pair of cameras including infrared emitting diodes in the vicinity of an image lens for illuminating a coordinate detection field;
a reflective outline frame formed of a member having a high reflectance and a member having a low reflectance running side by side along three sides of the display screen except a top side of the display screen so that a border line providing a sharp white and black contrast between the two members comes within the field of view of the two cameras; and
a control circuit which calculates the coordinate value of a pointing tool pointing to a position within the coordinate detection field, based on video signals output from the pair of cameras, and transfers the coordinate value to a program of a computer, the positioning tool being selected from the group consisting of a user'"'"'s finger and a pen which has a retroreflection member at its tip.
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Accused Products
Abstract
A coordinate input device includes a pair of cameras positioned in an upper left position and an upper right position of a display screen of a monitor lying close to a plane extending from the display screen of the monitor and views both a side face of an object in contact with a position on the display screen and a predetermined desk-top coordinate detection area to capture the image of the object within the field of view. The coordinate input device also includes a control circuit which calculates the coordinate value of a pointing tool, pointing to a position within a coordinate detection field, based on video signals output from the pair of cameras, and transfers the coordinate value to a program of a computer.
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Citations
10 Claims
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1. A coordinate input device comprising:
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a pair of cameras positioned in an upper left position and an upper right position of a display screen of a monitor lying close to a plane extending from the display screen of the monitor and views both a side face of an object in contact with a position on the display screen and a predetermined desk-top coordinate detection area to capture the image of the object within a field of view, each of the pair of cameras including infrared emitting diodes in the vicinity of an image lens for illuminating a coordinate detection field; a reflective outline frame formed of a member having a high reflectance and a member having a low reflectance running side by side along three sides of the display screen except a top side of the display screen so that a border line providing a sharp white and black contrast between the two members comes within the field of view of the two cameras; and a control circuit which calculates the coordinate value of a pointing tool pointing to a position within the coordinate detection field, based on video signals output from the pair of cameras, and transfers the coordinate value to a program of a computer, the positioning tool being selected from the group consisting of a user'"'"'s finger and a pen which has a retroreflection member at its tip. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A coordinate input device comprising:
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means for capturing an image positioned in an upper left position and an upper right position of a display screen of a monitor lying close to a plane extending from the display screen of the monitor and viewing both a side face of an object in contact with a position on the display screen and a predetermined desk-top coordinate detection area to capture the image of the object within a field of view, the means for capturing an image including means for illuminating in the vicinity of an image lens for illuminating a coordinate detection field, means for reflecting formed of a member having a high reflectance and a member having a low reflectance running side by side along three sides of the display screen except a top side of the display screen so that a border line providing a sharp white and black contrast between the two members come within the field of view of the means for capturing an image, and means for calculating the coordinate value of a pointing tool pointing to a position within the coordinate detection field, based on video signals output from the means for capturing an image, and transferring the coordinate value to a program of a computer, the positioning tool being selected from the group consisting of a user'"'"'s finger and a pen which has a retroreflection member as its tip. - View Dependent Claims (8, 9, 10)
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Specification