Apparatus for reading mark sheets

Details Apparatus for reading mark sheets Apparatus for reading mark sheets

1983-09-16

1986-12-30

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 46, G06K 920

Patent

active

046335072

ABSTRACT:
Apparatus with optical detecting device for reading a mark sheet provided with plural mark rows, each of which includes a reference mark, a skew detection mark and mark writing regions. The apparatus reads the mark sheet by use of a predetermined nominal scan window address for each of the regions. Optical shift of the optical detecting device is detected and the scan window addresses are corrected in accordance with the detected shift. Further, skew of the mark sheet is detected, and scan lines for reading the mark sheet is selected in accordance with the detected skew.

REFERENCES:
patent: 3337766 (1967-08-01), Malaby
patent: 3553437 (1971-01-01), Boothroyd
patent: 3553646 (1971-01-01), Hardin et al.
patent: 3763467 (1973-10-01), Cash et al.
patent: 3885229 (1975-05-01), Negita et al.
patent: 4300123 (1981-11-01), McMillin et al.
patent: 4558461 (1985-12-01), Schlang

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