A Nonlinear Hybrid Filter for Salt & Pepper Noise Removal from Color Images

Isma Irum, Muhammad Sharif*, Mudassar Raza and Sajjad Mohsin

Department of Computer Sciences COMSATS Institute of Information Technology Wah Cantt., 47040, Pakistan. *muhammadsharifmalik@yahoo.com

ABSTRACT

Impulse noise reduction or removal is a very active research area of image processing. A nonlinear hybrid filter for removing fixed impulse noise (salt & pepper) noise from color images has been proposed in this study. Technique is based on mathematical morphology and trimmed standard median filter. Proposed filter is composed of a sequence of morphological standard and well known operations erosion-dilation and trimmed standard median filter. It removes the fixed impulse noise (salt & pepper) very well without distorting the image features, color components and edges. It does not introduce blurring and moving effects even in high noise densities (up to 90%). The standard similarity measure peak signal to noise ratio (PSNR) and computation time have been used to evaluate the performance of proposed hybrid filter.

Keywords: Color image filtering, decision based trimmed median filter, impulse noise, mathematical morphology.

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