| US 7,532,204 B2 | ||
| Coordinate input system and coordinate input method | ||
| Yasunori Ake, Nara (Japan); and Tomohiko Yamamoto, Nara (Japan) | ||
| Assigned to Sharp Kabushiki Kaisha, Osaka (Japan) | ||
| Filed on Aug. 31, 2005, as Appl. No. 11/214,778. | ||
| Claims priority of application No. 2004-254471 (JP), filed on Sep. 01, 2004. | ||
| Prior Publication US 2006/0044287 A1, Mar. 02, 2006 | ||
| Int. Cl. G06F 3/041 (2006.01) | ||
| U.S. Cl. 345—173 [178/18.01] | 12 Claims |
| 1. A coordinate input system, comprising:
indicating means for indicating coordinate positions;
a coordinate data extracting section for sequentially extracting a plurality of coordinate data units from the coordinate
positions indicated with the indicating means;
a storage section for storing the coordinate data units in the order of the extraction;
a cosine value deriving section for defining vectors connecting a plurality of points associated with the respective coordinate
data units in the order of the storage, and for deriving a cosine value of an angle formed by two adjacent vectors of a point
selected from the plurality of points; and
a coordinate data selecting section for discarding one of the coordinate data units associated with the selected point when
the cosine value derived by the cosine value deriving section is smaller than a given value and for transmitting and inputting
one of the coordinate data units associated with the selected point to a host when the cosine value is equal to or larger
than the given value.
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