代码实现
def Guidedfilter(im,p,r,eps):
mean_I = cv2.boxFilter(im,cv2.CV_64F,(r,r));
mean_p = cv2.boxFilter(p, cv2.CV_64F,(r,r));
mean_Ip = cv2.boxFilter(im*p,cv2.CV_64F,(r,r));
cov_Ip = mean_Ip - mean_I*mean_p;
# cov(x, y) = E[XY] - E[X]E[Y]
mean_II = cv2.boxFilter(im*im,cv2.CV_64F,(r,r));
var_I = mean_II - mean_I*mean_I;
a = cov_Ip/(var_I + eps);
b = mean_p - a*mean_I;
mean_a = cv2.boxFilter(a,cv2.CV_64F,(r,r));
mean_b = cv2.boxFilter(b,cv2.CV_64F,(r,r));
q = mean_a*im + mean_b;
return q;
