Method and apparatus for decoding two-dimensional bar code
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United States of America Patent
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Jun 3, 1997
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N/A
app pub date -
Jun 3, 1994
filing date -
Mar 1, 1989
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Abstract
A method and apparatus for decoding a two-dimensional bar code symbol using a charge-coupled device (CCD) camera, charge-modulation device (CMD) camera, or other bar code reading device such as a hand-held reader, light pen or wand, scan mouse, or stationary laser scanner. The CCD/CMD camera or reading device optically images the bar code symbol to obtain digital image data, which is stored in a memory. The location and orientation of the two-dimensional bar code
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