Data symbol reading system

Details Data symbol reading system Data symbol reading system

1996-06-19

1998-05-19

Pitts, Harold

Image analysis

Histogram processing

For setting a threshold

235462, 235455, G06K 936

Patent

active

057546703

ABSTRACT:
A stationary data symbol reader includes a CCD, lens, CCD drive circuit, amplification circuit, binarization circuit, memory, CPU, light sources, light source drive circuit, communication driver, switch circuit and trigger switch. When reading, a frame image capture is carried out, and a number of picture elements of the fields of the frame corresponding to the displacement of an authenticator pattern (associated with the data symbol) between a second field image and a first field image is calculated. The moving speed of the data symbol is calculated from the displacement. The optimal light exposure time is calculated from the moving speed, and the optimal intensity of illumination is calculated from the exposure time.

REFERENCES:
patent: 4782455 (1988-11-01), Morinouchi et al.
patent: 4949391 (1990-08-01), Faulkerson et al.
patent: 5473148 (1995-12-01), Tanaka et al.
patent: 5478997 (1995-12-01), Bridgelall et al.

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