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Fluid level monitoring is an important control process in engineering systems. The level measurement of fluids having changeable densities is a complex task. Most measurement methodologies use sensors that are periodically paused for recalibrations. For flammable liquids, this may be unsafe and even dangerous. This paper proposes a safe recalibrating-free computer-based methodology for measurement of fluid levels, which is based on Hough transform, image processing and normalization. This paperdoi:10.5923/j.computer.20150503.01 fatcat:ob47glp2grenzk6bqzjuxbqcva