Bar-code field detecting apparatus performing differential process and bar-code reading apparatus
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United States of America Patent
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Sep 8, 1998
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app pub date -
Nov 10, 1997
filing date -
Sep 28, 1994
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Abstract
A bar-code field detecting apparatus first differentiates, in X and Y directions, image data of a document including a bar code, the position of which is not determined. It then expands each of the differential images in the direction opposite to the direction in which the image data is differentiated. Expanded images are subjected to bar-code field detection.
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