<title>3D-shape-based retrieval within the MPEG-7 framework</title>

PANORAMA: A 3D Shape Descriptor Based on Panoramic Views for Unsupervised 3D Object Retrieval

“…Ohbuchi et al [18] proposed enhanced shape functions, namely the (absolute) angle distance histogram for inconsistently oriented meshes, which are extensions of the D2 shape distribution. Zaharia et al [19] presented the 3D shape spectrum descriptor which is the histogram that describes the angular representation of the first and second principal curvature along the surface of the 3D object. In [20] Koertgen et al make use of 3D shape contexts which are histograms each one corresponding to a surface point and capturing the distribution of the relative coordinates of the remaining surface points.…”

Efficient 3D shape matching and retrieval using a concrete radialized spherical projection representation

“…In the following a detailed description is given regarding the exact computation of a 3D model's center of mass and its surface covariance matrix, using the continuous principal component analysis [5,26].…”

“…In [25], the same author proposes a combination of the absolute angle-distance function with the alpha shape representation of 3D models. Zaharia et al [26] presented the 3D shape spectrum descriptor which is within the MPEG-7 framework. This shape representation is the histogram of the shape index values calculated for the entire mesh of a 3D model, where each shape index value is the angular representation of the vector composed of the first and second principal curvature at a specific surface point.…”

Emotional face expression profiles supported by virtual human ontology

“…Such feature extraction can further be incorporated into a 3D model retrieval system. The basic approach 5 usually consists in providing a target 3D shape and in retrieving from the database 3D shapes that show similarities in the features space with the target shape. An alternate application classifies similar 3D shapes into clusters.…”