Apparatus and method of rapidly locating edges of machine-readab

Details Apparatus and method of rapidly locating edges of machine-readab Apparatus and method of rapidly locating edges of machine-readab

1997-02-20

1999-05-11

Lee, Michael G.

Registers

Coded record sensors

Particular sensor structure

2354621, 23546225, 23546241, 382296, 382199, G06K7/10

Patent

active

059029870

ABSTRACT:
A method and apparatus locates edges of patterns in a stored image, such as edges of bars or finder patterns of machine-readable symbols. The present invention first selects an edge point or pixel within a stored image. A dominant direction is determined therefrom by examining a region surrounding the selected point. A smaller window is then examined around the edge point to derive a hexadecimal code based on binary values of pixels which surround the edge point. The hexadecimal code is compared to a table of codes, where each code maps to a similar window and identifies a next edge point. The process continues in the dominant direction until the entire edge is located. Circuitry for rapidly performing the its location of patterns in a stored image, such as ages of bars of finder patterns of machine-readable symbols.

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