Optimum piecewise-constant Wiener filters
Leonard J. Cimini, S.A. Kassam · Journal of the Optical Society of America · 1981
Wiener filters are often used for the restoration of images embedded in additive noise. However, it is often desirable to have a simpler filter structure that is easily implemented and performs well. In this paper we present the necessary conditions for a filter with an optimum piecewise-constant frequency-response function. Such a filter has a simpler implementation than the Wiener filter, and, in general, it suffers only a small loss in mean-square-error performance, as is illustrated in numerical examples.