SIGNAL PROCESSING IN BARCODE READING WITH A WAVELET TRANSFORMATION
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United States of America Patent
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app pub date -
Apr 23, 2009
filing date -
Oct 18, 2005
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Abandoned
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Abstract
A method for processing a digital signal obtained in a barcode reading operation comprises a step of applying a wavelet transformation to the digital signal. The noise threshold at each level of the wavelet transformation is determined from a total transfer function in the analogue processing stage, and the coefficients are set to be zero if less than the noise threshold.
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