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Image processing steps to determine the extent of vapor clouds attached to the rotor cylinder (position marked by a circle): a) raw image, b) mean background image, c) difference (image (a) - image (b)), cylinder area replaced by a circular mask, d) thresholding to create a mask of vapor cloud extend (white), e) morphological closing, f) difference image intersected with image (e) to verify the correctness of vapor segmentation.
