Method and apparatus for locating and decoding machine-readable

Details Method and apparatus for locating and decoding machine-readable Method and apparatus for locating and decoding machine-readable

1995-10-30

1998-07-07

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235462, 235463, 235454, 235494, G06K 710

Patent

active

057773092

ABSTRACT:
A method and apparatus for locating and decoding machine-readable symbols is provided. In a preferred embodiment, an image of the symbol is stored and a sampling path through the stored image is selected. The sampling path represents a reflectance signal profile formed through the symbol. Characteristic or critical points are selected along the profile, including minimum and maximum points of peaks and valleys in the profile. Distances between the centers of peaks and valleys are determined. The present invention locates a defined portion of the symbol, such as a finder pattern, by locating a predetermined series of measured distances, such as a series of adjacent, substantially equal distances. After having located the finder pattern, the present invention determines the location of the symbol within the stored image, and thereafter decodes the symbol.

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