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Method for detecting a code with the aid of a mobile station

  • US 20070183652A1
  • Filed: 06/17/2005
  • Published: 08/09/2007
  • Est. Priority Date: 06/18/2004
  • Status: Abandoned Application
First Claim
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1. A method for detecting a code (40), in which method a mobile station (50) is used to capture an image of the subject (40) and the image is analysed and decoded into a numerical form in the mobile station (50), characterized in that, before the decoding of the bar code in the mobile station a calculated quality indicator is defined in real time from each camera image from the variance of the grey tones, which depicts the probability that the bar code is in the image field and can be interpreted correctly, on the basis of the quality indicator, a decision is made as to whether the bar code is 1D or 2D, in the case of a 1D bar code, the quality indicator is calculated from the Line of Interest, in which the differences between the grey tones along the line are greatest, in the case of a 2D bar code, the quality indicator is calculated on the basis of the difference histogram of the grey tones of the image above the assumed bar code, the value of the quality indicator is shown to the user on the display of the telephone, by using graphical signs, for example, in such a way that poorer visibility of the code is shown with red and higher visibility with yellow and green, and a high-resolution image is captured once the quality indicator of the bar code exceeds a specified threshold level and the Line of Interest defined in the low-resolution stage is interpreted.

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