Reading method of the two-dimensional bar code
AssigneeSanyo Electric Co., Ltd.
InventorsTsutomu Nakazawa, Kouichi Hamakawa, Youji Takei, Masanobu Kiyama
Life of this patent
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Abstract
A two-dimensional bar code printed on a piece of paper is photographed by the area sensor. A reading method of this bar code includes a process for correcting the distortion of the image of the two-dimensional bar code obtained from the area sensor by the projection transform, a process for correcting bright spots appearing in the image, and a process for decoding the two-dimensional bar code based on the image data of the two-dimensional bar code corrected by the two processes. This invention enables size-reduction of the reading device of the two-dimensional bar code and also achieves a higher reading speed of the reading device.
Claims5
A reading method of a two-dimensional bar code comprising:
- correcting a distortion of an image of the two-dimensional bar code obtained from an area sensor by a projection transform;
- correcting brightness imbalance of the bar code image;
- and
- decoding the two-dimensional bar code based on image data of the two-dimensional bar code after the distortion correction and the brightness correction.
Dependencies are inferred from the claim text.