System, circuit, and method for edge detection in a binary...

Details System, circuit, and method for edge detection in a binary... System, circuit, and method for edge detection in a binary...

2007-04-10

2007-04-10

Lee, Michael G. (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

Reexamination Certificate

active

10866308

ABSTRACT:
Systems better detect transitions in a binary optical code signal and thus better detect edges in binary optical codes, such as bar codes. The optical code signal imperfectly indicates perceived regions of relatively dark and light areas arranged in an alternating pattern as part of an optical code. That signal is differentiated to form a first derivative. Due to various non-ideal conditions, the first derivative may have a series of successive local peaks of the same polarity. Peaks in the series having a peak value less than a previous peak value in the series are ignored, thereby resulting in a set of unignored peaks. From the unignored peaks in the series is chosen the one peak occurring last in order. According to the chosen peak, there is generated a signal more reliably indicating the true edge position between light and dark areas in the pattern.

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