Abstruct-Most current algorithms developed for image sequence filtering require motion information in order to obtain good results both In the still and moving parts of an image sequence. In this paper, filters which completely preserve stationary regions in image sequences are introduced. In moving regions, the 3-D filters inherently reduce to spatial filters and perform well in these areas without any motion-compensation or motion-detection.A new multivariate filtering operation called the alphatrimmed vector median is proposed. Guidelines for the determination of optimal 3-D median-related structures for color and gray-level image sequence filtering are given. Algorithms based on vector median, extended vector median, alpha-trimmed vector median, and componentwise median operations are developed. Properties of the human visual system are taken into account in the design of filters. Noise attenuation and detail preservation capability of the filters is examined. In particular, the impulsive noise attenuation capability of the filters is analyzed theoretically. Simulation results based on real image sequences are given.

In this paper several digital video signal processing algorithms that use the median operation are presented. Both numerical and visual evaluations of the resulting image sequences clearly show that the median operation has many desirable properties for digital image sequence processing applications.

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In the vector median approach the samples of the vector-valued input signal are processed as vectors as opposed to componentwise scalar processing. The VM-type filters utilize the correlation between different components in video signal. This makes the VM-filters attractive in video signal processing. In this paper the performance of vector median filters for color video signals is investigated. Vector median FIR median hybrid filters (VFMH) for cross luma and cross color cancellation are introduced. In the VFMEI filter the vector median operation is combined with linear substructures resulting in improved cross color and cross luma attenuation and in very good noise attenuation.

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