The aim of the paper is to introduce and compare various methods which can be used for an image processing. Studied methods include the image pre-processing and the image segmentation based on the Gaussian mixture model and the active contour. The images are acquired within the measurement of the liquid film disruption on the aerofoil's trailing placed edge in the wind tunnel. As the result is suggested sequence of the particular image processing techniques for an optimal result. This work is

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... e part of the wider project devoted to the coarse water droplets which have a negative effect on the steam turbines efficiency and reliability.