Although the visual comparison of the orientation indicatrices makes immediately explicit the textural difference of the corresponding 3D images, the comparison of the indicatrices by a computer requires the description of their shapes. Ideally, one or two features that capture the most prominent features of the shape of each indicatrix should be extracted from them and used for their comparison. We propose here three such measures:
• Anisotropy coefficient:
p1 = , (6) ^min where Hmin and Hmax correspond to the minimum and the maximum values of the indicatrix, respectively.
• Integral anisotropy measure:
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