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US07798409B2 Reading failure prevention in imaging readers 有权
成像阅读器阅读失败预防

Reading failure prevention in imaging readers
Abstract:
In an imaging reader for reading a coded symbol located in a range of working distances from the reader, a solid-state imager captures light from the symbol over a field of view, and a controller automatically determines whether an image of the symbol is located entirely within the field of view of the imager, and processes the symbol only when the symbol image is located entirely within the field of view of the imager.
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