| 摘要 |
A method is described of detecting two-dimensional codes, in particular matrix codes, which include a plurality of light and dark data bits arranged two-dimensionally, in particular in matrix form. In the method, the code is detected as a gray scale value image; the detected gray scale value image is split into image areas corresponding to the individual data bits and a binarizing threshold representing a specific gray scale value is determined for the image areas. A respective binarizing of the gray scale value of the individual image areas is carried out by means of the binarizing threshold to produce a bit sequence which represents the data bits and consists of the values 0 and 1. The bit sequence is subsequently supplied to an error correction algorithm to recognize and/or correct bit errors within the bit sequence. In accordance with the invention, those so-called uncertain image areas are determined whose gray scale values each lie close to the binarizing threshold. Furthermore, these uncertain image areas are taken into special account in the error correction.
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