United Parcel Service of America, Inc.

David Goodwin Shaw

Donald G Chandler

Govind Shah

Donald Gordon Chandler

A method and system for acquiring an optical target affixed to a surface of a package with an optical scanning device. Height information associated with the height of the surface of the package is sensed and a height signal representative of a scanning distance between the optical target and the optical scanning device is generated. The package surface is scanned with the optical scanning device to generate an optical target input signal. The optical target input signal is converted in accordance with a first sampling frequency to provide a converted input signal, and a second resampling frequency is adjusted in accordance with the height signal. The converted input signal is reconverted in accordance with the second resampling frequency to generate a frequency shifted optical target signal, and the optical target on the surface of the package is acquired in accordance with the frequency shifted optical target signal.

Frequency shifter for acquiring an optical target

An optical target is acquired by an optical scanning system according to an in-band target frequency in an input signal from an optical scanning device. Both the in-band energy level and the out-of-band energy level of the input signal from the optical scanning device are determined. These two energy levels are compared and a possible detection of the target is determined according to this comparison. A minimum threshold of in-band energy is required in order for the possible detection to be confirmed.

Growing community of inventors

Middletown Township, NJ, United States of America

David Goodwin Shaw