Johannes Coetzer

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We developed a system that automatically authenticates offline handwritten signatures using the discrete Radon transform (DRT) and a hidden Markov model (HMM). Given the robustness of our algorithm and the fact that only global features are considered, satisfactory results are obtained. Using a database of 924 signatures from 22 writers, our system achieves(More)
In this paper we present a novel writerindependent off-line signature verification system. This system utilises the discrete Radon transform and a dynamic time warping algorithm for writerindependent signature representation in dissimilarity space. The system also considers writer-specific statistics for dissimilarity normalisation. A discriminant function,(More)
When a large number of documents, e.g. bank cheques, have to be authenticated in a limited time, the manual verification of, say the authors’ signatures, is often unrealistic. This led to the development of a wide range of automatic off-line signature verification systems. However, the value of such a system is rarely demonstrated by conducting a subjective(More)
With the proliferation of mobile devices, provision of M-health care services has become feasible even in the remotest villages of Africa. Research however shows that many M-health initiatives have not been adopted and used effectively especially in rural communities. Some of the factors contributing to this range from a lack of knowledge with regard the(More)
An artificial respirator was used to ensure successful and precise artificial respiration in short and long term experiments during radical exposure of the caudal cervical region and thoracic cavity to investigate cytological changes in the carotid body of mature chickens (Gallus domesticus). Modification of the respirator to stabilize gas flow, temperature(More)
In this paper we present a novel writer-independent on-line signature verification system. The proposed system obtains a universal signature representation in dissimilarity space, but remains able to compensate for the personal variability of an individual's handwriting by subsequently employing a writer-specific dissimilarity normalisation strategy.(More)