Method and system for detecting a correction pattern in a QR code
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United States of America Patent
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Sep 20, 2016
Grant Date -
Apr 2, 2015
app pub date -
Dec 11, 2013
filing date -
Sep 29, 2013
priority date (Note) -
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Abstract
Method and system for detecting a correction pattern in a QR code are disclosed. In the detection of a correction pattern, coordinates of the correction pattern is at first roughly estimated according to the detected coordinates of the detection patterns and different QR code versions, then a square region is specified around the coordinates of the correction pattern, in which a search is performed repeatedly. Finally, in conjunction with the characteristic of the correction pattern itself, i.e., having a line segment meeting a predetermined ratio, the correction pattern may be accurately located in the predetermined area, without the need of searching patterns meeting a 1:1:1 ratio line by line in the entire QR code image.
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