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In this chapter a particular image processing problem existing in quality assurance for steel industry is addressed. Since the quality standards in steel industry are ever increasing, even steel industry starts to use machine vision systems to monitor their product quality. In case of steel coils a particular figure of merit in quality is the roundness (ellipticity) or lack thereof of the coil. The mathematical correct measure of the roundness is the eccentricity , with the major semi axis a and the minor semi axis b. But the fastest way for the

Image Processing and Concentric Ellipse Fitting to Estimate the Ellipticity of Steel Coils