| http://www.w3.org/ns/prov#value | - The second discrete wavelet transform portion 206 receives the original signature image from a storage 204 and performs discrete wavelet transform thereon (step 306) to obtain N???N wavelet coefficients, N being another predetermined integer smaller than M. Here, N is a constant value fixed for each image and is preferably less than or equal to ??? of M so as to suppress the influence on the origi
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