Method and apparatus for removing noise at the ends of a stroke

Details Method and apparatus for removing noise at the ends of a stroke Method and apparatus for removing noise at the ends of a stroke

1983-08-09

1985-08-06

Schreyer, Stafford D.

Image analysis

Histogram processing

For setting a threshold

382 13, 178 18, G08C 2500

Patent

active

045340609

ABSTRACT:
A method and apparatus are described for processing a series of digital signals representing a stroke of a stylus on a tablet to minimize noise at the ends of the stroke, the series of signals corresponding to the X and Y coordinates of a series of points along the direction of travel of the stroke. First the signals for the X and Y coordinates of each point in the series are compared to the signals for the X and Y coordinates of the points adjacent to it to form a second series of signals comprising only those signals having an ordinate value more extreme than the corresponding ordinate value of its adjacent points. The first point in the second series of signals is then compared with points succeeding the first point to identify the point in the second series that is furthest from the first point but within a predetermined distance from the first point. The point so located is identified as the end point at that end of the stroke. The end point for the other end of the stroke is identified in a similar manner using the second series of points but starting with the last point in the series and comparing it with preceeding points. A third series of signals are then generated, using the end points so identified as the first and last points and all points between the two end points from the first series as intermediate points.

REFERENCES:
patent: 4284975 (1981-08-01), Odaka
patent: 4319331 (1982-03-01), Elbaum et al.
patent: 4375081 (1983-02-01), Blesser
Fast Generation of Chain Code, B. G. Batchelor, B. K. Marlow, IEE Proc., vol. 27, Pt. E., No. 4, Jul. 1980.

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