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image segmentation thresholding watersheds adaptive median filters images cones and rods representing digital images elements of visual perception adaptive filters mean filters order-statistic filters spatial filtering: mean filters image restoration and reconstruction search region based algorithm watershed algorithm k-means clustering segmentation clustering variable thresholding multiple thresholding segmenation otsu's method markers region based segmentation edge based segmentation blurring - ideal low pass filter low pass filter low pass filter high pass filter band pass filte image filtering in the frequency domain ilpf filtering basics of spatial filtering local histogram processing histogram matching histogram equalization uses for histogram processing histogram equalization histogram matching local hi histogram processing contrast stretching intensity-level slicing gamma transformations piecewise-linear transformation function enhancement intensity transformation functions spatial domain vs. transform domain intensity transformation image quantization image interpolation image sampling and quantization a simple image formation model image acquisition and representation spatial and intensity resolution brightness adaptation image