We introduce a method for segmenting a shape from an image and simultaneously determining its symmetry axis. The symmetry is used to help the segmentation and in turn the segmentation determines the symmetry. The problem is formulated as one of minimizing a goodness of fitness function and Dijkstra’s algorithm is used to find the global minimum of the cost function. The results are illustrated ...

In this paper, we propose an automatic algorithm for finding a correspondence map between two 3D surfaces. The key insight is that global reflective symmetry axes are stable, recognizable, semantic features of most real-world surfaces. Thus, it is possible to find a useful map between two surfaces by first extracting symmetry axis curves, aligning the extracted curves, and then extrapolating co...

This paper proposes a neural network model that extracts axes of symmetry from visual patterns. The input patterns can be line drawings, plane figures or gray-scaled natural images taken by CCD cameras. The model is a hierarchical multi-layered network, which consists of a contrast-extracting layer, edgeextracting layers (simple and complex types), and layers extracting symmetry axes. Its archi...

A natural interaction with virtual environments is one of the key issues for the usability of Virtual Reality applications. Device-free, intuitive interactions with the virtual world can be achieved by capturing the movements of the user with markerless motion capture. In this work we present a markerless motion capture approach which can be used to estimate the human body pose in real-time wit...

Over 99% of modern animals are members of the evolutionary lineage Bilateria. The evolutionary success of Bilateria is credited partly to the origin of bilateral symmetry. Although animals of the phylum Cnidaria are not within the Bilateria, some representatives, such as the sea anemone Nematostella vectensis, exhibit bilateral symmetry. We show that Nematostella uses homologous genes to achiev...

We investigated the relative importance of convexities (protrusions) and concavities (indentations) for the perception of shape. On the one hand, it has been suggested that convexities determine the shape of an object, whereas concavities merely act as "perceptual glue" between t he convexities. On the other hand, it hasbeen argued that concavities are more salient than convexities. We show tha...

We propose a method for detecting facial symmetry axis from frontal face image. The proposed adopts voting procedure like Hough transform that transforms set of edge points into perpendicular bisectors two different selected the set. The initial guess is adjusted accurately by following fine tuning procedure. Experimental results show correctly detects axes real images visually a...