Globally Optimal Grouping for Symmetric Closed Boundaries by Combining Boundary and Region Information

Many natural and man-made structures have a boundary that shows a certain level of bilateral symmetry, a property that plays an important role in both human and computer vision. In this paper, we present a new grouping method for detecting closed boundaries with symmetry. We first construct a new type of grouping token in the form of symmetric trapezoids by pairing line segments detected from the image. A closed boundary can then be achieved by connecting some trapezoids with a sequence of gap-filling quadrilaterals. For such a closed boundary, we define a unified grouping cost function in a ratio form: the numerator reflects the boundary information of proximity

• Type: Journal
• Year: 2008
• Where: PAMI
• Authors: Joachim S. Stahl, Song Wang
• Keywords: Bilateral Symmetry, Closed Boundary, PAMI 2008, Unified Grouping Cost