Digitizing method and apparatus for compensating cursor of stylu

Details Digitizing method and apparatus for compensating cursor of stylu Digitizing method and apparatus for compensating cursor of stylu

1986-04-23

1987-08-11

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

046863311

ABSTRACT:
A digitizer measuring abscissas and ordinates at separate times compensates these coordinates for errors created by cursor or stylus motion during the digitizing process. At the highest level of operation this is achieved by altering the coordinate measurement sequence to be abscissa, ordinate, abscissa, and then associating the ordinate with the average of the two abscissas. Two ordinates separated by an intervening abscissa could be used as well. At a lower level a similar alteration in measurement procedure allows for correction of errors in the determination of coarse values from pairs of fine values X' and X" or Y' and Y" by application of the principle of the vernier. When cursor motion is present the two fine values of a pair do not correspond to the same point. This is overcome by measuring X', X", and X' and associating X" with the average of the two X' values to find the coarse X value. The same is done with Y', Y" and Y' to find the coarse Y value.

REFERENCES:
patent: 4552991 (1985-11-01), Hulls

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