Coordinate input apparatus

Details Coordinate input apparatus Coordinate input apparatus

1997-06-24

1999-01-19

Wu, Xiao

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

178 1801, 178 1802, G09G 500

Patent

active

058618740

ABSTRACT:
It is an object of the invention to provide a coordinate input apparatus which can eliminate an input point erroneously inputted. Values of voltage of pairs of electrodes 31, 32; 33, 34 of a tablet 24 are sampled at time t1 by A/D converter circuits 41, 42 to obtain values of X and Y coordinates of a latest input point. A coordinate predicting circuit 43 finds a predicted point of an input point of one period ahead from the coordinates of the latest input point and the input point at time t0 of one period before. The predicted point of the input point at time t1 is found in advance when the input point at time t0 is obtained. An erroneous input discriminating circuit 44 finds an error of the coordinates of the latest input point and the predicted point with respect to X- and Y-axis directions. When the error of the coordinates is less than an allowable error both in X- and Y-axis directions, the input point is determined to be valid and the coordinate of the input point is supplied to a buffer 47 as it is. When the error of the coordinates is the allowable error or more, the input point is determined to be invalid and (0, 0) is supplied to the buffer 47.

REFERENCES:
patent: 4277783 (1981-07-01), Sampieri et al.
patent: 5500937 (1996-03-01), Thompson-Rohrlich

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