Finally the fiber density of the fiber pattern is obtained by using the two dimensional FFT and the directional filtering.

This paper presents a ship detection method combining wavelet analysis and directional filtering for cloudy remote sensing images.

This paper introduces image processing technology into it,and information of the edge is obtained through directional filtering,adaptive filtering and automatic entropic threshold region-based partition,and extract feature of the image,finally,use k-nearest neighbor algorithm to confirm the level of hydrophobic.

Effective fingerprint image orientation filter enhancement algorithm;

Fingerprint image enhancement algorithm based on the fuzzy set and the orientation filter;

A set of orientation filters are constructed to filter the fingerprint images.

According to the characteristics of fingerprints,the proposed algorithm also designs a group of oriented filters,and then manipulates them to filter the image depending on the orientation of the.

Analysis of a large number of fingerprint samples suggests that the mask size of the oriented filter should be changed in real time with fingerprint frequency variations.

Because the texel of periodic texture is the patch with the texture s period,here try to calculate the period by direction filter,and then synthesize the periodic texture by sampling with the period.

This paper presents a method that can remove streaking noise better by means of direction filtering based on two dimension Fourier transform.

Introduced the whole process of the direction filtering method processing images,which is based on the analysis and comparison of present pre-processing algorithm for fingerprint image,and presented the mathematical model describing the fingerprints as well.