Bar code symbol reading apparatus with double-reading preventing function
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United States of America Patent
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Nov 15, 1994
Grant Date -
N/A
app pub date -
Feb 17, 1993
filing date -
Feb 20, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A comparing section compares the coordinates of the four corners of a bar code symbol newly detected by a bar code symbol detecting section and stored in a primary buffer, with the coordinates of the four corners of a bar code symbol having been detected and stored in a secondary buffer. If the coordinates of the newly detected bar code symbol differ from those of the detected bar code symbol, a control section causes a decoding section to decode the bar code symbol on the basis of image data stored in a frame memory. On the other hand, if not so, it is determined that the newly detected bar code symbol is invalid, thereby inhibiting decoding of the same to prevent double-reading.
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