A Detection Method of Intersections for Determining Overlapping using Active Vision
P. Gil, F. Torres, O. Reinoso
First International Conference on Computer Vision, Theory and Applications  (Setubal (Portugal), February 2006)
 ISBN:972-8865-40-6  - pp. 501-507



Pablo Gil, Fernando Torres
Department of Physics Engineering Systems and Signal Theory, University of Alicante, Alicante, Spain
pgil@dfists.ua.es, ftorres@dfists.ua.es

Oscar Reinoso
Department of Industrial Systems Engineering, Miguel Hernandez University, Elche, Spain

Keywords: Discontinuities, Overlapping, Occlusion, Occluded partially objects, Structured light.

Abstract: Sometimes, the presence of objects difficult the observation of other neighboring objects. This is because part of the surface of an object occludes partially the surface of another, increasing the complexitiy in the recognition process. Therefore, the information which is acquired from scene to describe the objects is often incomplete and depends a great deal on the view point of the observation. Thus, when any real scene is observed, the regions and the boundaries which delimit and dissociate objects from others are not perceived easily. In this paper, a method to discern objects from others, delimiting where the surface of each object begins and finishes is presented. Really, here, we look for detecting the overlapping and occlusion zones of two or more objects which interact among each other in a same scene. This is very useful, on the one hand, to distinguish some objects from others when the features like texture colour and geometric form are not sufficient to separate them with a segmentation process. On the other hand, it is also important to identify occluded zones without a previous knowledge of the type of objects which are wished to recognize. The proposed approach is based on the detection of occluded zones by means of structured light patterns projected on the object surfaces in a scene. These light patterns determine certain discontinuities of the beam projections when they hit against the surfaces becoming deformed themselves. So that, such discontinuities are taken like zones of boundary of occlusion candidate regions.