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Three stage trimmed median mean filter to remove salt and pepper noise in images

G. BALASUBRAMANIAN1,* , A. CHILAMBUCHELVAN2, S. VIJAYAN3

Affiliation

  1. Department of Electronics and Communication Engineering, Institute of Road and Transport Technology, Erode-638316, India
  2. Department of Electronics and Instrumentation Engineering, R.M.D. Engineering College, Kavaraipettai-601206, India.
  3. Principal and Head in Department of Electrical and Electronics Engineering, Surya Engineering College, Erode-638107, India

Abstract

In this paper, a new three stage trimmed median-mean filter (TSTMMF) has been proposed for denoising the images corrupted by salt and pepper noise (SPN). The pixels which are corrupted by SPN have been identified and subjected to two stages of trimmed median filtering of different window size. Noise free estimations available from these cascaded stages of filtering, will replace the noisy pixels in an orderly manner. The noisy pixel left over by these stages, if any, would be replaced by the noise free pixel available just prior to the current processing noisy pixel. A simple 3X3 mean-filtering, which is applied as a third stage of denoising if the estimated noise density (ND) of given noisy image exceeds a predefined threshold noise density, to enhance the correlation among the denoised samples and hence better denoising performance. Experimental results prove that the proposed TSTMMF has outperformed the recently proposed state-of-the-art-filters available in the literature, in terms the denoising parameters such as peak signal to noise ratio (PSNR), structural similarity index (SSIM), image enhancement factor (IEF), mean absolute error (MAE) and visual representation..

Keywords

Denoising, Mean filter, Noise density, Salt and pepper noise, Three-stage, Trimmed median.

Submitted at: April 19, 2015
Accepted at: May 7, 2015

Citation

G. BALASUBRAMANIAN, A. CHILAMBUCHELVAN, S. VIJAYAN, Three stage trimmed median mean filter to remove salt and pepper noise in images, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 5-6, pp. 856-862 (2015)