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Method, diaphragms and optical receiving devices for improving the depth of field in a linear optical reader

By S. Barsotti and D. Vincenzi


The invention regards a method for improving the depth of field in the detection of a linear optical code, comprising simultaneously forming two or more overlapped equally focused but differently diaphragmed in phase images of an optical code onto a linear sensor. Diaphragms and optical receiving devices suitable to implement the method are described

Topics: Imaging barcode readers, depth of field extension, wavefront apodization
Year: 2007
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