Human perceptual categorization of iris texture patterns

Techniques of computer animation, allied with traditional visual psychophysics, provide potentially useful tools for the exploration of the perception of human actions. In this ongoing research we examine the use of motion blends to study action…

The suggestion of a functional hemispheric dissociation in performing perceptual categorization was examined in two tachistoscopic experiments with normal adults. Subjects were required to match physically identical or similar, but nonidentical,…

With an increasing emphasis on security, automated personal identification based on biometrics has been receiving extensive attention over the past decade. Iris recognition, as an emerging biometric recognition approach, is becoming a very active…

Prior research has shown that the textural detail of the iris is sufficiently distinctive to distinguish identical twin siblings. However, no research has addressed the question of whether twins' irises are sufficiently similar in some sense to…

We present an iris identification approach based on wavelet-packet binary coding. This latter is carried out by coding the 64 wavelet-packet energies to generate a compact signature (iris code), quantizing these energies into one bit according to an…

The aim of this study was to evaluate category learning in schizophrenia on tests of perceptual abstraction. Participants learned to categorize simple geometrical shapes. The categories were either well-defined (discrete categories, or DCs) or…

This paper focuses on a new iris identification method based on a local analysis of the iris texture. In the method, the iris is divided in sub-regions, using locally sliding windows, to extract local signatures. Local distances are then calculated…

Iris images have been proposed as a means of biometric verification and identification. Transformation of iris image coordinates to account for change in pupil size were performed by Daugman (Daugman 1993) based on a linear model. In order to…

The location of the texture limits in an iris image is a previous step in the person's recognition processes. The iris localization plays a very important role because the speed and performance of an iris recognition system is limited by the results…

Recent evidence raised the possibility that the neostriatum and the corticostriatal circuits could play an important role in semantic categorization. In this study, we examined the electrophysiological correlates of natural scene categorization in…