PSO Based Edge Keeping Suppression of Impulses in Digital Imagery
This paper proposes an efficient switching median filter to restore digital images corrupted by high density of random valued impulse noises. The noise detection is performed using all neighbor directional weighted pixels in the 5 x 5 window. Arithmetic absolute differences and intensity of the center pixel is compared with other pixels in the test window to define a noisy pixel. To restore the noisy pixel variable window based median filtering has been done. Particle swarm optimization(PSO), a recent stochastic global optimization technique has been adopted to obtain best fitted parameters of the proposed detection and filtering operators. Simulation results, conducted on a variety of gray scale images clearly exhibit that the proposed operator obtains better results compared to existing directional weighted filters.
KeywordsParticle Swarm Optimization Impulse Noise Center Pixel Impulsive Noise Noise Density
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- 1.Swarmintelligence, http://www.swarmintelligence.org/ (accessed on August 25, 2011)
- 9.Forouzan, A.R., Araabi, B.: Iterative median filtering for restoration of images with impulsive noise. Electronics, Circuits and Systems 1, 232–235 (2003)Google Scholar
- 10.Gonzalez, R.C.: Woods: Digital image processing, 2nd edn. Pearson Prentice-Hall (2002)Google Scholar
- 13.Mandal, J.K., Sarkar, A.: A novel modified directional weighted median based filter for removal of random valued impulse noise. In: International Symposium on Electronic System Design (ISED), pp. 230–234 (December 2010)Google Scholar
- 14.Mandal, J.K., Sarkar, A.: A modified weighted based filter for removal of random impulse noise. In: Second International Conference on Emerging Applications of Information Technology, pp. 173–176 (February 2011)Google Scholar
- 16.Sa, P.K., Dash, R., Majhi, B.: Second order difference based detection and directional weighted median filter for removal of random valued impulsive noise. IEEE Signal Processing Letters, 362–364 (December 2009)Google Scholar