US 2010/0303310 A1Published application

High-performance fingerprint image-processing method

OwnerLi-Kuo Chiuinventor

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Abstract

The present invention is a high-performance fingerprint image-processing method that use a composite filtering approach to perform the image enhancement through a combination of linear filtering and rhombus filtering after obtaining the determination for the fingerprint direction of fingerprint instead of the image enhancement performed in the frequency domain of the prior art; and then a binarizing step will follow to demonstrate the minutiae for image enhancement, also, the composite filter applied in the present invention can truly perform the image enhancement and mend the broken lines mainly focusing on each point in different fingerprint direction; furthermore, the present invention can use a filtering mask with a very low mask coefficient; thus, the filtering time and memory space can be significantly saved while the time spent and storage space occupied for image enhancement can be lessened largely.

Claims6

Dependent claims

A high-performance fingerprint image-processing method comprising the following steps:

determining the fingerprint direction being to apply numerical equations within a processor to further read and determine the fingerprint direction in part of characteristic ridges from a collected Gray-Scale image of an original fingerprint;
linear filtering of composite filtering being to apply definition equations of linear mask filter within the processor and to rotate a linear spatial filter within the processor based on the determined fingerprint direction in part to perform a filtering operation at each point on the collected fingerprint image;
rhombus filtering of composite filtering being to apply definition equations of rhombus mask filter within the processor and to rotate a rhombus spatial filter within the processor based on the fingerprint direction of the fingerprint image, which has been linear filtered to perform a filtering operation at each point on the collected fingerprint image;
and
binarizing being to perform an binarizing operation for the fingerprint image that has been rhombus filtered by the processor in order to demonstrate the effect of image enhancement.

2 more elements

Dependencies are inferred from the claim text.