In principle, the whole orientation histogram can be used to characterize the texture of 3D data. However, this is a rather cumbersome representation and ideally one would like to use only a few features to describe its shape. Perhaps the grosser characteristic one may observe in the orientation histogram is its symmetry: A spherically symmetric histogram implies a totally isotropic volume, whereas any deviation from that is a cue to the anisotropic structure of the underlying material. In what follows, therefore, we use the orientation histogram in order to characterize the anisotropy of the data.
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