
(a) Imagem Original 

(b) Image filtered with Epanechnikov filter using 5x5 mask 

(c) Image after manual line selection using a paint application. 

(d) Distance using thinning and matching borders with lines perpendicular to the thinned wideline pixels. 

(e) CWLD algorithm response using the CIE L*a*b* 1976 deltaE and no line filter, i.e. no bright or dark lines selection. 

(f) CWLD algorithm response using the CIE L*a*b* 1976 deltaE and a bright line filter selection. 

(g) CWLD algorithm response using the CIE L*a*b* 1976 deltaE and a dark line filter selection. 

(h) CWLD algorithm response using the CIE L*a*b* 1994 deltaE and no line filter, i.e. no bright or dark lines selection. 

(i) CWLD algorithm response using the CIE L*a*b* 2000 deltaE and no line filter, i.e. no bright or dark lines selection. 

(j) CWLD algorithm response using the CIE L*a*b* 2000 deltaE and a bright line filter selection. 

(k) CWLD algorithm response using the CIE L*a*b* 2000 deltaE and a dark line filter selection. 

(l) CWLD algorithm response using the CMC (l, c) 1984 deltaE and no line filter, i.e. no bright or dark lines selection. 

(m) CWLD algorithm response using the CIE L* deltaE and no line filter, i.e. no bright or dark lines selection. 

(n) CWLD algorithm response using the CIE L* deltaE and a bright line filter selection. 

(o) CWLD algorithm response using the CIE L* deltaE and a dark line filter selection. 

(p) CWLD algorithm response using the grayscale deltaE and no
line filter, i.e. no bright or dark lines selection. Note that here the
threshold t is calculatedas the standard wld algorithm. 

(q) CWLD algorithm response using the grayscale deltaE and a
bright line filter selection. Note that here the threshold t is
calculated as the standard wld algorithm. 

(r) CWLD algorithm response using the grayscale deltaE and a
dark line filter selection. Note that here the threshold t is
calculated as the standard wld algorithm. 

(s) CWLD algorithm response using the RGB deltaE and no line filter (bright or dark) selection. 