Method: CED
C:      1.000000
sigma:  0.500000
rho:    5.000000
alpha:  0.001000
ht:     0.250000
kmax:   1000
dir_v:  20.000000
dir_h:  0.000000

double(edge(result_ced, 'sobel', [], 'vertical'))

bwmorph(result_edge, 'skel', Inf)

Original file
alpha: 153.7407 beta: 101.6427 gamma: 1.5126

Modified file
alpha: 105.5385 beta: 19.4467 gamma: 5.4271