Many techniques have been devised these last ten years to add an appropriate directionality concept in decompositions of images from the specific transformations of a small set of atomic functions. Let us mention for instance works on directional wavelets, steerable filters, dual-tree wavelet transform, curvelets, wave atoms, ridgelet packets, . . . In general, features that are best represente...

We studied the spatial organization of directionally selective neurons in the cortical middle temporal visual area (area MT) of the Cebus monkey. We recorded neuronal activity from multielectrode arrays as they were stepped through area MT. The set of recording sites in each array penetration described a plane parallel to the cortical layers. At each recording site, we determined the preferred ...

In natural acoustical environments, most biologically related sounds containing frequency-modulated (FM) components repeat over periods of time. They are often in rapid sequence rather than in temporal isolation. Few studies examined the neuronal response patterns evoked by FM stimuli at different presentation rates (PR). In the present investigation, by using normal electrophysiological techni...

Recent advances in high-resolution fluorescence microscopy have enabled the systematic study of morphological changes in large populations of cells induced by chemical and genetic perturbations, facilitating the discovery of signaling pathways underlying diseases and the development of new pharmacological treatments. In these studies, though, quantification and analysis of morphological feature...

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...

In this paper, we have presented a compression scheme for iris images using Wavelet Based Directional Transform (WBDT) through Templates of Discrete Time Cellular Neural Network (DTCNN) and Directional Filter Bank (DFB). The complex annular part of the iris portion of the eye image contains many distinctive features such as arching ligaments, furrows and ridges. The compression algorithms devel...

The rapid growth in the number of large-scale repositories has brought the need for efficient and effective content-based image retrieval (CBIR) systems. The state of the art in the CBIR systems is to search images in database that are “close” to the query image using some similarity measure. The current CBIR systems capture image features that represent properties such as color, texture, and/o...

Many techniques have been devised these last ten years to add an appropriate directionality concept in decompositions of images from the (affine) transformations of a small set of atomic functions (e.g. directional wavelets, steerable filters, curvelets, wave atoms). Generally features which are best represented are straight lines (as those defining contours of objects), smooth curves (e.g. cur...

It is well-known that severe deformation to metals causes a direct grain refinement of the matrix without special heat-treatments due to the mechanism of dynamic continuous recrystallization (DCR). However, the microstructural revolution during severe deformation is seemed to be different depending on the deformation mode, namely the direction of deformation. In general, multi-directional defor...