Automatic signature verification.

摘要

A method of automatically verifying a signature of an individual with a computer is described. A digitized image with a number of picture elements is established from the signature to be verified. Parameter values to be verified are calculated from this digitized image and are compared with corresponding reference parameter values which were calculated and stored previously. Depending on a comparison of the reference parameter values and the parameter values to be verified it is decided if the signature to be verified is true or false. Various possibilities are described for the calculation of significant parameters. The gravity-center of all densities of all rows and all columns of the digitized image is a parameter which can be used for a preselection. Centers-of-gravity, gravity lines, maximum values and maximum lines, etc. are further significant parameters. Parameters with a very high reliability can be generated by calculating second order polynomials which describe segments of the signature. <IMAGE>