[Retracted] An Image Recognition Framework for Oral Cancer Cells

Algorithm 1

Variance calculation.

(1)	The probability of background and target appearance is computed as .
(2)	The average gray level in the cluster is defined as .
(3)	The variance of the two types of clusters and the variance between clusters are as follows: , , .
(4)	To satisfy the minimum difference between clusters and the maximum difference between clusters, we can set to find the that satisfies the maximum.