Coordinate input apparatus

A coordinate input apparatus comprising:

• two-dimensional coordinate input means having a flat pointing area, for outputting a two-dimensional coordinate corresponding to a point within the pointing area which is continuously pointed, per a predetermined period;
• coordinate predicting means for defming a predicted coordinated area showing a range of coordinates predicted to be outputted from the two-dimensional coordinate input means in correspondence to the coordinate outputted from the two-dimensional coordinate input means, in accordance to a predetermined procedure per a predetermined period;
• erroneous input discriminating means for determining that the coordinate outputted from the two-dimensional coordinate input means is valid only when the coordinate is contained within the predicted coordinate area defined in correspondence to the coordinate;
• and
• coordinate defining means for defining the coordinate outputted from the two-dimensional coordinate input means as it is when the coordinate is determined to be valid by erroneous input discriminating means and for the rejecting the coordinate when it is determined to be invalid;
• wherein the coordinate predicting means corresponds to the output of the coordinate defining means and defines the predicted coordinate area by using a plurality of coordinates defined by the coordinate defining means.