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Issue No. 05 - May (2010 vol. 32)
ISSN: 0162-8828
pp: 799-814
Dimitris Arabadjis , National Techncal University of Athens , Athens
Panayiotis Rousopoulos , National Techncal University of Athens, Athens
Constantin Papaodysseus , National Technical University of Athens, Athens
Michalis Panagopoulos , National Techncal University of Athens, Athens
Panayiota Loumou , National Techncal University of Athens, Athens
Georgios Theodoropoulos , Agricultural University of Athens, Athens
A novel methodology is introduced here that exploits 2D images of arbitrary elastic body deformation instances so as to quantify mechanoelastic characteristics that are deformation invariant. Determination of such characteristics allows for developing methods offering an image of the undeformed body. General assumptions about the mechanoelastic properties of the bodies are stated which lead to two different approaches for obtaining bodies' deformation invariants. One was developed to spot a deformed body's neutral line and its cross sections, while the other solves deformation PDEs by performing a set of equivalent image operations on the deformed body images. Both of these processes may furnish a body-undeformed version from its deformed image. This was confirmed by obtaining the undeformed shape of deformed parasites, cells (protozoa), fibers, and human lips. In addition, the method has been applied to the important problem of parasite automatic classification from their microscopic images. To achieve this, we first apply the previous method to straighten the highly deformed parasites, and then, apply a dedicated curve classification method to the straightened parasite contours. It is demonstrated that essentially different deformations of the same parasite give rise to practically the same undeformed shape, thus confirming the consistency of the introduced methodology. Finally, the developed pattern recognition method classifies the unwrapped parasites into six families, with an accuracy rate of 97.6 percent.
Deformation invariant elastic properties, automatic curve classification, parasite automatic identification, straightening deformed objects, image analysis, elastic deformation, pattern classification techniques.

D. Arabadjis, P. Rousopoulos, P. Loumou, M. Panagopoulos, G. Theodoropoulos and C. Papaodysseus, "A General Methodology for the Determination of 2D Bodies Elastic Deformation Invariants: Application to the Automatic Identification of Parasites," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 32, no. , pp. 799-814, 2009.
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