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Comparison of proposed directional filter algorithm with the bilateral approach and wavelet soft thresholding for different detector entrance exposure values from 6 nGy/pulse to 45 nGy/pulse. Quality of the filtered images is measured in terms of the (a) misclassification rate of the device segmentation using an ideal threshold and (b) the contrast to noise ratio. Significantly better results compared to the second best are marked by ∗ for p < 0.05 and + for p < 0.01.
