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Two-dimensional code reading method, two-dimensional code reading program, recording medium with two-dimensional code reading program, two-dimentional code reading device, digital camera and portable terminal with digital camera

  • US 20040011872A1
  • Filed: 07/17/2003
  • Published: 01/22/2004
  • Est. Priority Date: 07/18/2002
  • Status: Active Grant
First Claim
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1. A two-dimensional code reading method comprising processing steps of acquiring an image of a matrix type two-dimensional code composed of a number of cells arranged in vertical and horizontal directions to form a matrix of the cells each representing binary coded data, deciding a two-dimensional code area in the image, setting inspection lines identifying a center position of each of the cells, said inspection lines each joining two paired opposites of four sides defining the boundary of the decided two-dimensional code area and reproducing information of the two-dimensional code based on the inspection lines set by the inspection line setting processing, wherein coefficients in image position calculating equations for calculating coordinate positions of center positions of respective cells in the two-dimensional code compensated for image inclination by adding inclination information for the two-dimensional code are calculated for setting the inspection lines on the two-dimensional code image based on coordinate positions of 4 points within the two-dimensional code area decided by the two-dimensional code area deciding step.

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