This paper is concerned with the non-parametric estimation of probability distributions from band-limited and at least critically sampled signals such as images. Conventional approaches employing histograms or Parzen windows often perform unsatisfactorily since they ignore two important properties of such signals, namely that they are ordered and contain sufficient information to reconstruct th...

Custom JPEG quantisation matrices are proposed to be used in the context of compressing iris polar images within iris recognition. These matrices are obtained by employing a Genetic algorithm for the corresponding optimisation. Superior matching results in iris recognition in terms of average Hamming distance and improved ROC are found as compared to the use of the default JPEG quantisation table.

McGurk and MacDonald (Nature 264, 746-748, 1976) discovered that when a discrepancy is created between visual information from lip movements and speech information from the auditory channel then perceivers often report a percept that is neither the auditory or visual stimulus, an illusory response. This ‘McGurk’ effect is strong evidence that perceivers extract key information about a speech so...

Sigma delta modulation M has become a widespread method of analogue to digital conversion however its operation has not been completely de ned The majority of the analysis carried out on the circuit has been from a linear standpoint with non linear analysis hinting at hidden complexities in the modulator s operation The sigma delta modulator itself is a non linear system consisting as it does o...

We propose a new method for rhythm quantisation and measurement of expressive timing. This paper focuses on the automatic quantisation and rhythmic transcription of syncopated rhythms and baroque ornaments, e.g. appogiaturas, mordants and trills from time-tagged audio recordings without knowing the score in advance. We demonstrate the transcription of the Aria of J. S. Bach’s Goldberg Variation...

A hybrid 3D compression scheme which combines fractal coding with neighbourhood vector quantisation for video and volume data is reported. While fractal coding exploits the redundancy present in different scales, neighbourhood vector quantisation, as a generalisation of translational motion compensation, is a useful method for removing both intraand interframe coherences. The hybrid coder outpe...

We review an approach to non-commutative geometry, where models are constructed by quantisation of the coordinates. In particular we focus on the full DFR model and its irreducible components; the (arbitrary) restriction to a particular irreducible component is often referred to as the“canonical quantum spacetime”. The aim is to distinguish and compare the approaches under various points of vie...