Image thresholding based on the EM algorithm and the generalized Gaussian distribution
In this paper, a novel parametric and global image histogram thresholding method is presented. It is based on the estimation of the statistical parameters of object and background classes by the expectationmaximization (EM) algorithm, under the assumption that these two classes follow a generalized Gaussian (GG) distribution. The adoption of such a statistical model as an alternative to the more common Gaussian model is motivated by its attractive capability to approximate a broad variety of statistical behaviors with a small number of parameters. Since the quality of the solution provided by the iterative EM algorithm is strongly affected by initial conditions (which, if inappropriately set, may lead to unreliable estimation), a robust initialization strategy based on genetic algorithms (GAs) is proposed. Experimental results obtained on simulated and real images confirm the effectiveness of the proposed method.
image thresholding generalized gaussian distribution genetic algorithms expectationmaximization algorithm