complex_gradient.m

指纹增强算法, 研究指纹识别的可以参考一下. matlab.

%------------------------------------------------------------
%ibm_complex_gradient
%
%------------------------------------------------------------
function g = ibm_complex_gradient(img)
    img = double(img);
    hy  = fspecial('sobel');
    hx  = hy';
    gx  = imfilter(img,hx,'same','symmetric');
    gy  = imfilter(img,hy,'same','symmetric');
    g   = gx+i*gy;
%end function ibm_complex_gradient