Method and apparatus for calibrating an optical document digitiz

Details Method and apparatus for calibrating an optical document digitiz Method and apparatus for calibrating an optical document digitiz

1984-10-01

1986-08-12

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358290, 358289, 358264, H04N 136

Patent

active

046059709

ABSTRACT:
A calibration strip (80) is described for use in calibrating an optical document digitizer. The strip (80) includes an optically detectible pattern including plural discrete blocks (82) with orthogonal first and second edges (84, 86). Edges (84) are parallel to the drum axis when strip (80) is mounted to the drum (10). As the drum (10) rotates, these first edges (84) are detected and provide a reference for a Y-coordinate axis. With the drum (10) stopped, the second edges (86) are detected by a scanning array (53), as it is stepped by a motor (60) along an X-coordinate axis. The microstep location of each of the detected edges (86) is stored. During document scanning, the array (53) moves along the X-axis to the known microstep locations. The strip (80) has shaft indexing and optics magnification patterns (210, 212).

REFERENCES:
patent: 3849592 (1974-11-01), Rosenheck
patent: 4506301 (1985-03-01), Kingsley et al.
patent: 4543615 (1985-09-01), van Campenhont et al.

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