Evaluation Of Order Statistic Filters Using A Modified Signal To Noise Ratio

Renee L. J. Martens; A. N. Venetsanopoulos

doi:10.1117/12.970022

1 November 1989 Evaluation Of Order Statistic Filters Using A Modified Signal To Noise Ratio

Renee L. J. Martens, A. N. Venetsanopoulos

Proceedings Volume 1199, Visual Communications and Image Processing IV; (1989) https://doi.org/10.1117/12.970022
Event: 1989 Symposium on Visual Communications, Image Processing, and Intelligent Robotics Systems, 1989, Philadelphia, PA, United States

Abstract

One major problem in evaluating image filters is the lack of a quality measure that is objective and quantitative yet reflects the demands of the human visual system. This study will use two new quality measures that will attempt to address this problem. The peak-to-peak signal-to-noise ratio (PSNR) for edge areas will demonstrate how the edge areas are affected by the different filters while the PSNR for the homogeneous areas will similarly demonstrate the effect in the homogeneous areas. In some applications the edge areas are more important then the homogeneous areas and vice-versa. The results of the research, therefore, contribute to the study of filter effectiveness in terms of specific applications. In addition the paper demonstrates the effect of different image types on the performance of order statistic filters. The study compares the following: 1) the adaptive trimmed mean filter [1], 2) the signal adaptive median filter [2], 3) the adaptive double window modified trimmed mean filter [3], 4) the adaptive window edge detecting median filter [45], 5) the median filter [6], 6) the a -trimmed mean filter [7], and 7) the contraharmonic mean [8]. The seven filters are compared using the PSNR, the PSNR for edge areas and the PSNR for homogeneous areas. The edge areas and homogeneous areas is determined through the use of a simple range edge detector on the original noise free image. Four different images are used for comparison: 1) 'Lenna', 2) 'Geometrical', 3) 'Harbor' and 4) 'Jones'. Three noise types will be used: 1) impulsive, 2) additive and 3) a mixture of impulsive and additive noise.

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Renee L. J. Martens and A. N. Venetsanopoulos "Evaluation Of Order Statistic Filters Using A Modified Signal To Noise Ratio", Proc. SPIE 1199, Visual Communications and Image Processing IV, (1 November 1989); https://doi.org/10.1117/12.970022

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KEYWORDS

Digital filtering

Image filtering

Electronic filtering

Image quality

Nonlinear filtering

Filtering (signal processing)

Image processing

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