A New Class of Midpoint type Nonlinear Filters for Eliminating Short and Long Tailed Noise in Images

Abstract

A new class of midpoint type filters for image processing is proposed in this short paper. First, we describe Alpha Trimmed Midpoint (ATMP) filter which is quite effective in eliminating impulsive (long tailed) and uniform (short tailed) noise. Next, we introduce Adaptive Alpha Trimmed Midpoint (AATMP) filter which performs midpoint filtering in the homegeneous regions and operates as a median smoother close to the edges. Finally, a modified filter, which we call Modified Adaptive Alpha Trimmed Midpoint (MAATMP) filter, is proposed. MAATMP filter provides good noise reduction for the data confounded by uniform and impulsive noise, retains edge structures and preserves fine details. The proposed filters are evaluated for their performance on a test image and the results obtained are included.

Indexing terms:

• Nonlinear filters
• Order statistic filters

Additional information

Notes on contributors

E Srinivasan

E Srinivasan was born at Govindanagaram, Theni District, Tamil Nadu, India. He received BE degree from PSG College of Technology, Coimbatore, India in 1984, and the ME degree from Anna University, Chennai in 1987. In 1987, he joined the faculty of Department of Electronics and Communication Engineering, Pondicherry Engineering College, Pondicherry, where he is an Assistant Professor. Currently, he is a PhD Scholar in School of Electronics and Communication, Anna University, Chennai under QIP(AICTE) scheme. His are of research is nonlinear order-statistic filters for image processing applications. He has 12 national/international publications to his credit.

D Ebenezer

D Ebenezer has BE (1980), ME (1983) from PSG College of Technology, Coimbatore, and PhD (1994) from Anna University, Chennai. At Present, he is an assistant Professor in the School of Electronics and Communication Engineering, Anna University, Chennai. He has 18 years of experience in industry, teaching and research. His areas of interest are digital filters and telecommunication switching. He has published several papers in national and international journals and conferences in the area of digital filters. He is a referee for Journal of Medical Engineering and Physics, UK. He is an associate member of Institution of Engineers (India) and Member of Indian Society for Technical Education.