Reconstructing the drawing process of reproductions from medieval images

Based on 14th century paintings and their 18th century manual reproductions we reconstruct the temporal order of the sketching process and analyze how images were altered by artists. Therefore, we present a novel algorithm for decomposing images into groups of parts that were similarly transformed between images. Moreover, a method is proposed that orders all parts based on the relatedness of their transformation. Based on this ordering, a third dimension, which corresponds to the timeline of the drawing process, is added to 2D paintings.