Abstract: The thresholding method based on two-dimensional Renyi's entropy is a classical thresholding approach.However, it suffers from the sensitivity to the salt and pepper noise. I}his paper introduced the median filtering method which is robust to the salt and pepper noise into the process of constructing the two-dimensional histogram. To further improve the performance of the algorithm, an improved version of particle swarm optimization with increasing inertia weight was employed. Several experiments show the algorithm is effective.

Key words: Two-dimensional histogram, Image thresholding, Two-dimensional Renyientropy, Particle swarm optimization, Increasing inertia weight