Multiple threshold encoding of machine readable code
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United States of America Patent
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Jan 11, 1994
Grant Date -
N/A
app pub date -
Aug 19, 1991
filing date -
Aug 19, 1991
priority date (Note) -
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Abstract
A method and apparatus for applying coded data to a substrate and decoding the data in which the data are encoded in cells having a determined number of pixels. The pixels are coded, preferably by binary printing, in accordance with the number of coded pixels and not their position. In decoding of the cells, the gray scale levels of the pixels are sensed, and converted to digital signals. The digital signals are summed, for all of the pixels of the cell, and compared with multiple threshold levels in order to recover the data.
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