Digitizer cursor velocity offset error correction system

Details Digitizer cursor velocity offset error correction system Digitizer cursor velocity offset error correction system

1992-08-13

1998-10-13

Mengistu, Amare

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

178 1802, G09G 508

Patent

active

058219161

ABSTRACT:
Methods and apparatus are shown for correcting velocity-induced offset errors in a digitizing system when the cursor is moved diagonally across a sensing grid. Primarily, this is a system for reducing the offset error in the actual and depicted cursor position when a pen cursor is moved rapidly over a digitizing screen of a pen-driven computer. It also provides double the number of positional outputs for added accuracy. A triplet of data is formed by taking two samples from one axis and one from the second axis. The two samples are averaged to form one component of the cursor position and then the average along with the single sample from the other axis are output as the positional coordinates. A second sample is then taken from the second axis to form a new data triplet. The averaging process is repeated with the two data points from the second axis and the average along with the second sample from the first axis are output as a next position of the cursor. The process of inputting a next data point from the axis other than the last sampled to form sequential data triplets is repeated to track the movement of the cursor and output its position.

REFERENCES:
patent: 4255617 (1981-03-01), Carau, Sr. et al.
patent: 4571454 (1986-02-01), Tamaru et al.
patent: 4754267 (1988-06-01), Reynolds et al.
patent: 4831566 (1989-05-01), Mathews et al.
patent: 5229551 (1993-07-01), McDermott et al.

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