Comparison of two different nuisance removal algorithms on the 100 × 100 top left region of the udf-10 field. Left: median filtering with a window of 144 channels. Right: DCT + PCA. Red: local maxima M+ larger than v = 3σ after the mean (v = 9.4 for the median and v = 6.6 for the DCT+PCA). The grayscale ranges from 0 (white) to 16 (black).
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