Directional statistics in nonlinear vector field filtering
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On the geodesic paths approach to color image filtering
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Adaptive vector median filtering
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Optimal weighted median filtering under structural constraints
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Directional processing of color images: theory and experimental results
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Figures of merit for color scanners
IEEE Transactions on Image Processing
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Weighted median image sharpeners for the World Wide Web
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IEEE Transactions on Image Processing
Adaptive Color Image Filtering Based on Center-Weighted Vector Directional Filters
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Fast detection and impulsive noise removal in color images
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Real-Time Imaging - Special issue on multi-dimensional image processing
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In this paper, a class of weighted vector directional filters (WVDFs) based on the selection of the output sample from the multichannel input set is analyzed and optimized. The WVDF output minimizes the sum of weighted angular distances to other input samples from the filtering window. Dependent on the weighting coefficients, the class of the WVDFs can be designed to perform a number of smoothing operations with different properties, which can be applied for specific filtering scenarios. In order to adapt the weighting coefficients to varying noise and image statistics, we introduce a methodology, which achieves an optimal trade-off between smoothing and detail preserving characteristics. The proposed angular optimization algorithms take advantage of adaptive stack filters design and weighted median filtering framework. The optimized WVDFs are able to remove image noise, while maintaining excellent signal-detail preservation capabilities and sufficient robustness for a variety of signal and noise statistics.