This paper presents an algorithm of half ellipse detection from color images. Additionally the algorithm detects two color average values along the both sides of a half ellipse. In contrast to standard methods the new one finds not only parameters of the entire ellipse but also the end points of a half ellipse. The paper introduces a new way of edge and line detection. The new detector of edges in color images was designed to extract color on the both sides of an edge. The new line detector is designed to optimize the detection of endpoints of a line.
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