Orientation Difference Statistics for Texture Description

This paper presents a new approach fur the description of directional textures based on the stady of their orientation and cuherence fields. We apply the featurebased interaction maps to the characterization of an orientation field. The features are extracted from orientation spatial difference histograms. The representation of a feature, as a ftinctiun of the spacing vector used to compute the spatial statistics, yields a Z-D interaction map which can be used to assess the structural layout of texture. Orientation-based interaction maps are exercised on original and distorted Brudatz textures. The results show the relevance and the robustness of the approach fur the description of directional textures. tures can be addressed by means of their orientation field. The aim of the present article is to use the orientation field in order to retrieve the structural layout of directional textures. Our approach is based on spatial difference statistics of the orientation field. It applies the feature-based interaction maps, initially introduced in the framework of grey level based texture analysis (e.g. [3]), to the description of an orientation field. This paper will organize as follows: in section 2, we will briefly discuss orientation estimation methods and related issues. Then, in section 3, we will introduce the orientation difference histograms from which the descriptive features are derived. Finally, section 4 will present the orientation-based interaction maps, which are applied to the characterization of natural textures. 2. The Orientation Field