Recursive Algorithms of Maximum Entropy Thresholding on Circular Histogram

Table 1

Comparison of computation speed for different methods (in seconds).

Image number	Method 1	Method 2	Method 3	Method 4	Method 5	Method 6
a	3.9869	1.7478	0.0643	0.0551	1.5284	0.0112
b	4.2964	1.8128	0.0379	0.0560	1.6406	0.0111
c	4.0930	1.7795	0.0370	0.0536	1.5328	0.0115
d	4.1798	1.8705	0.0843	0.0531	1.6673	0.0113
e	4.1727	1.8273	0.0638	0.0627	1.5942	0.0126
f	4.2592	1.8463	0.0453	0.0619	1.5641	0.0113
g	4.2922	1.8159	0.0392	0.0580	1.4899	0.0125
h	4.2794	1.8556	0.1010	0.0635	1.6836	0.0182