Patent ID: 6718052
Filing Date: 2004-04-06
Classification: G06K,G06T

Abstract:
An image emphasizing device, comprising:a Fourier transformation member provided to treat an original pictorial image with a one-dimensional Fourier transformation along different directions so as to determine respective Fourier coefficients; a weight member provided to emphasize an obscure image represented by a minute amplitude value along said respective Fourier coefficients in the corresponding directions so as to produce weighted Fourier coefficients; an inverse Fourier transformation member provided to treat said weighted Fourier coefficients with a one dimensional inverse Fourier transformation in said different directions to determine corresponding minute amplitude value emphasis data; a synthesizing member provided to synthesize said corresponding minute amplitude value emphasis data to determine an image data in which said minute amplitude value is emphasized; a feature extraction member provided to analyze said image data with the use of group delay spectra in said different directions in which peak values are emphasized by removing envelope components of spectra obtained from a linear prediction analysis; a registration member provided to recognize whether or not a registration requirement is satisfied on the basis of a feature extraction data obtained from said feature extraction member, said feature extraction data being stored in a memory as a registration data when said registration requirement is satisfied; and a collation member provided to collate said registration data with a collation data derived from a feature extraction data of an entrant, said registration data being collated with said collation data in terms of a distance when said distance is a threshold value or less than said threshold value, wherein said Fourier coefficient is represented by F(k), said weight member is represented by (A2), and said weighted Fourier coefficients are processed with said one-dimensional inverse Fourier transformation to obtain a time series g(n), Where&it;â€ƒ&it;F&af;(k)=&Sum;n=0N-1&it;f(n)&it;&ee;-j&it;â€ƒ&it;2&it;mkN=ak+j&it;â€ƒ&it;bkA2={kmif&it;â€ƒ&it;k&leq;N2(N-k)mif&it;â€ƒ&it;k>N2&it;&NewLine;&it;g&af;(n)=1N&it;&Sum;k=0N-1&it;(Aak+j&it;â€ƒ&it;bk)&it;&ee;j&it;â€ƒ&it;2&it;mkN.