Abstract-In this paper, an on-line signature verification scheme based on similarity measurement of logarithmic spectrum is proposed. The principal components of the logarithmic spectrum of each signature are extracted. We then compute the similarity of logarithmic spectrum between input signature and the reference template. By comparing the similarity of logarithmic spectrum with the verification threshold, we can determine the authenticity of the input signature. Based on the experimentation, the rates of false rejection errors and false acceptance errors are as low as 1.4 and 2.8%, respectively. This demonstrates the effectiveness of the proposed scheme.

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This paper proposes a new algorithm of median filters for VLSI implementation. The architecture based on this algorithm has modular, regular, locally connected and expansible features. The throughput of the filter is independent of the window size and the hardware complexity is O(WN), where W is the window size and N is the bit number per pixel.