reconstruction of fragmented objects
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Wall paintings, drawn circa 1650 B.C. in the frame of the Late Bronze Age civilization that flourished at Akrotiri Thera, are nowadays frequently excavated in many thousands of fragments. The restoration of the wall paintings is a very pain-stacking and time consuming process. Experienced conservators spend months or even years of dedicated work for the reconstruction of a wall painting. In certain cases, correct fragment matching is not possible if it is based only on human aptness. Thus, the development of an information system for the automated fragments matching, may be a very important tool in the wall paintings restoration.
If one wishes to develop a system for automatic reconstruction of fragmented objects, then many parameters should be taken into account, such as:
• matching between external contours of the fragments
• region borders continuation between actually adjacent fragments
• colour continuation
• continuation of the thematic content
• crack continuation
• geological texture of the side opposite to the painted one, etc.
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| Fragment images from Akrotiri, Thera | ||||
Our group has developed a novel information system that solves the problem of the reconstruction of fragmented objects, based only on the two-dimensional contour information. In other words, this system solves the two-dimensional puzzles automatically, employing the contour of the various pieces/fragments.(C. Papaodysseus, Th. Panagopoulos, M. Exarhos, C. Triantafyllou, D. Fragoulis, “Contour-shape Based Reconstruction of Fragmented, 1600 B.C. Wall Paintings”, IEEE Transactions on Signal Processing, Vol. 50, No 6, June 2002, pp.1277-1288.)
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Our group has solved the special, but very important for the application in hand case, of fragmented object reconstruction on the basis of thematic continuation. Since geometric stencils were used for the drawing of many wall paintings [Panagopoulos Th., Papaodysseus C., Exarhos M., Triantafillou C., Roussopoulos G., Roussopoulos P., Prehistoric Wall-Paintings Reconstruction Using Image Pattern Analysis And Curve Fitting, WSEAS Transactions on Electronics 1, no 1 (2004) 108-113], we have used these stencils to optimally match fragments on them. This is a typical case where mathematics and computer engineering can overcome the intrinsic difficulties of human perception.
A first successful approach to employed color continuation.