An Improved Algorithm of DPM for Two-dimensional Barcode

Data Matrix is a two-dimensional matrix code which has many advantages like as large information density, high capacity, and small size and so on. It is widely used in industrial automation, logistics, transportation and other fields. A two-dimensional barcode includes printing and DPM barcodes, which depending on the differences of the application at backgrounds of the two-dimensional barcode. DPM is the abbreviation for Direct Part Mark and has some weaknesses, like low contrast, more noise jamming, complicated background, uneven illumination during the data appreciation process. The main mission of this paper was to put forward a series of image preprocessing methods which links binaryzation and morphological transformation based on handheld device, and achieve adaptive smoothing fuzzy and adaptive morphological transform through the DPM detection. The experimental results show that the method can overcome problems such as too large middle gap, the uneven illumination and noise.