N. Luke Seed

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This paper presents a study of digital pulse interval modulation (DPIM) for optical wireless communications using intensity modulation with direct detection. DPIM code properties are discussed and expressions for the transmission capacity, power spectrum and error probability are presented. We show that for a given number of bits per symbol, DPIM has higher(More)
We have analysed the requirements for a robust stereo vision algorithm for use in typical industrial applications. For such applications the views obtained in the two cameras have large differences in visual appearance due to the orientation difference between the two cameras and the close proximity of illumination sources. We have concluded that for this(More)
In this paper we present inter-vehicular t M l c of data on a motorway wing a multi-hop network with a cluster-based ad-hoc regime over 802.11 spreadqectrum wireless. Both the protocol and its application are novel and are germane to demanding aecess point deployment environments such as motorways, battlefields and disaster zones. Packet voice(More)
Fluorescent lamps introduce a periodic interference signal in optical wireless receivers, which has the potential to severely degrade link performance. Usually, electrical high-pass filtering is employed to mitigate the effects of this interference, but this results in baseline wander or intersymbol interference. Digital pulse interval modulation (DPIM) is(More)
Temporal stereo vision algorithms can offer improved robustness, however, this can only be delivered after several frames of a stereo image sequence have been processed. We present a new method of bootstrapping temporal stereo which can overcome such start-up problems by applying additional coarse-to-fine pre-processing to the first few images in a stereo(More)
This paper presents a study of digital pulse interval modulation (DPIM) as a candidate modulation scheme for optical wireless communications. DPIM code characteristics are discussed and the theoretical error probability performance of DPIM is analysed in terms of the packet error rate. Performance comparisons are made with the more established techniques of(More)
Abstruct-A new VLSI architecture for an internally multiprocessing, single chip, SIMD-based Video Signal Processor (VSP) is presented. The Iimitations of extended DSP architectures and conventional Array Processors are discussed in the context of image processing, coding and computer vision. How thii gives rise to the architecture is described.(More)
In order to successfully track moving objects it is necessary to understand their motion. Such motion will inevitably change with time, thus attempting to fit the same model all of the time is inappropriate. An evaluation of the single model Kalman filter described in this paper demonstrates this. A maximum model coverage technique, however, would provide a(More)