Recursive Algorithms of Maximum Entropy Thresholding on Circular Histogram

Table 3

Comparison of computation speed for three-class thresholding with different methods (in seconds).

Image number	Brute force (considering symmetry)	Recursive algorithm
a	143.0696	1.8414
b	150.0313	1.6950
c	151.7360	1.6969
e	149.3216	1.6986
f	158.9558	1.7235
H	149.1618	1.7928
Average time	150.3794	1.7414