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The pending problem that research in random-valued impulse noise filtering has been facing is the inability to distinguish noisy values that do not occur as extreme outliers in comparison with other surrounding pixels. In this paper, we propose a new detection and filtering algorithm that consists of (1) a two-stage detection scheme that employs second-order difference between pixels to determine...
All kinds of median filters have been often adopted in impulse noise reduction. However, many details (e.g., thin lines and step edges) are easily lost, especially at high noise situation. Although many new techniques were added to these filters, the results of image filtering are still not satisfactory. Thus, in this paper, a cost function-based filter is proposed. The corrupted pixels are processed...
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