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The goal of this bachelor thesis was to add an image processing step to the music recognition software AudiVeris, in order to extract data even from faulty music sheet images. The procedure starts with a binarization using a regional version of Otsu's method. Following this the music sheet is searched for possible bendings, similar to those a hardcover book would cause. To achieve this the Hough transform is used for line detection and the k-means algorithm for cluster detection. Thereafter the music image is straightened using the discovered curvature.