In this paper we discuss the design of computer-based haptic graphs for blind and visually impaired people with the support of our preliminary experimental results. Since visual impairment makes data visualisation techniques inappropriate for blind people, we are developing a system which can make graphs accessible through haptic and audio media. The disparity between human haptic perception an...

The proliferation of Graphical User Interfaces (GUIs) has presented several serious accessibility problems to blind people. Existing approaches to overcome such problems are customised to specific environments and are restrictive in their scope. Moreover, they do not take into consideration the specific dialogue requirements of the various graphical applications. It is argued that in order to r...

In this paper, a new spreading scheme, which consists of two stages of spreading, is considered for DS-CDMA systems. The data of a user is spread first with a long signature sequence and then with a short signature sequence. The scheme combines the advantages of the two types of spreading techniques and allows us to suppress MAI by performing both beamforming and multiuser detection efficiently...

We present an original method for the online blind calibration of non-uniform photodetectors. The disparity of the detectors may arise from both irregular spatial arrangement and distinct slowly time-varying photometric transfer functions. As natural images are mostly continuous, the signal collected by neighboring detectors is strongly correlated over time. The core idea of our method is to tr...

Two Different Views of Origins There are two fundamentally different causes for human origins: blind natural processes (chance-law) or purposeful intelligent design. The chance-law hypothesis, neo-Darwinian evolution, states that humans arose through random mutations preserved by blind natural selection. Thus the famous paleontologist George Gaylord Simpson said in his book The Meaning of Evolu...

n this work we examine blind adaptive and iterative decision feedback (DF) receivers for direct sequence code division multiple access (DS-CDMA) systems in frequency selective channels. Code-constrained minimum variance (CMV) and constant modulus (CCM) design criteria for DF receivers based on constrained optimization techniques are investigated for scenarios subject to multipath. Computational...

This paper proposes a blind reversible watermarking techniquewhich incorporates the histogram shifting in wavelet domain. The integer wavelet transform is used to transform the image into wavelet domain. The watermark data is embedded into the sub-band coefficients identified by just noticeable distortion (JND)of the transformed host image. To ensure the prohibition of pixel overflow and underf...

According to the common underlying mathematical model for Independent Component Analysis (ICA), the fulfillment of a BSS for either a linear and scalar type of composition, a convolutive and linear type or a nonlinear type has different conditions. So far, several approaches have been developed in the last decades for stationary and non-stationary data. To identify key research priorities, the ...