G - Physics – 06 – K
Patent
G - Physics
06
K
G06K 19/06 (2006.01) G06K 7/10 (2006.01) G06K 9/42 (2006.01) G06K 9/46 (2006.01)
Patent
CA 2113252
An optical target is acquired by an optical scan- ning system according to an in-band target frequency in an input signal from an opti- cal scanning device. Both the in-band energy level and the out-of band energy level of the input signal from the opt- ical scanning device are de- termined. 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. The input signal may have various frequencies due to various amounts of magnification of the acquisition target as scanned by the optical scanning device. Thus the input signal may represent the target as various frequencies due to the various amounts of magnification. The various amounts of magnifica- tion of the acquisition target are due to various scanning distances between the scanning device and the acquisition target. Magni- fication compensation is therefore performed by providing an amount of frequency shifting of either the center frequency of a fil- ter or the input signal frequency. The amount of frequency shifting is determined according to scanning distance. The frequency shifting is accomplished by performing digital-to-analog conversion on the digital input signal at a flexed frequency. The output og the digital-to-analog converter is applied to an analog-to-digital converter where the analog signal is resampled at a varying re- sampling frequency. When the resampling frequency differs from the sampling frequency the signal is frequency shifted. Alter- nately, the resampled signal may be buffered and clocked out, in which case the frequency of the input signal is effectively shift- ed. In order to vary the amount of frequency shift according to the scanning distance, the resampling frequency applied to the analog-to-digital converter is varied according to the scanning distance. The relationship between the various resampling frequen- cy and the varying scanning distances may be selected to cause the various input frequencies representative of a scanned acquisi- tion target to be shifted to a single predetermined fundamental frequency.
Chandler Donald Gordon
Shah Govind
Shaw David Goodwin
Mccarthy Tetrault Llp
United Parcel Service Of America Inc.
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