Aiming at the problem that complex and changeable field light environment will affect the feature recognition of two-dimensional code image, the Niblack algorithm based on block is improved according to the characteristics of two-dimensional code image. A fusion two valued algorithm is proposed, which is based on the improved block Niblack and Otsu. First of all, the threshold of each block is respectively calculated by the Niblack and the Otsu algorithm on account of the improved block analysis. Then, the final threshold is obtained by weighted sum of two thresholds, and the image is segmented. Experiments show that this method can not only overcome the effects of uneven illumination, but also have the characteristics of strong anti-noise ability and fast processing speed.
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