Patent ID: 7532204

Claim:
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.