Fingerprint ridge image synthesis system, fingerprint ridge image synthesis method, and program thereof

摘要

A fingerprint ridge image synthesis system, configured to accurately extract the shape of the ridges contained in a fingerprint image and clearly reproduce the fingerprint of the fingerprint image on an image, includes: a ridge pixel parameter calculation unit that calculates parameter values including wavelet phase, ridge angle, and inter-ridge distance corresponding to each pixel by means of applying continuous wavelet conversion with respect to the gradient of each pixel contained in the fingerprint image; a label optimization processing unit that optimizes/converts the parameter values corresponding to each pixel to values indicating the mutual continuity with the parameter values in surrounding pixels; and a ridge image generation unit that generates the ridge image by means of converting each pixel gradient in the fingerprint image on the basis of the optimal value.

主权项

1. A fingerprint ridge image synthesis system, comprising:
a memory storing instructions; one or more processors configured to execute the instructions to:
set different wavelet wavelength (λ) and wavelet angle (θ) as parameter values of wavelets and set combinations of the wavelet wavelength and wavelet angle as parameter sets by corresponding to gradient of each pixel of the fingerprint image;perform continuous wavelet transform processing on partial regions within the fingerprint image corresponding to each of the pixels based on each of the different parameter sets, calculate consistency between the wavelets corresponding to each of the parameter sets and ridge shapes in each of the partial regions, and determine the parameter set of the highest consistency as the parameter set corresponding to each of the pixels;update the parameter values of the parameter sets of each of the pixels and each of neighboring pixels neighboring to those pixels to optimal values with which mutual continuity of the parameter values becomes optimum; andsynthesize the ridge image by setting gray-scale values of each corresponding pixel based on the parameter sets constituted with the optimal values.