Roberto A. Hexsel

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In this paper we present a real-time tracking system of surgical instruments in laparoscopic operations. We combine Condensation tracking, with the Hough Transform in order to obtain an efficient and accurate tracking. The Condensation algorithm performs well in heavy clutter, and the Hough Transform is robust under illumination changes, occlusion and(More)
In this paper we explore the design space of data caches looking for the combinations of design parameters that produce the best results at the smallest sizes. We introduce a technique named Pollution Control Victim Cache (PCVC) which improves the Pollution Control Cache (PCC), is simpler and performs better. Our simulations were run on the SimpleScalar(More)
This paper presents an efficient IrisCode classifier, built from phase features which uses AdaBoost for the selection of Gabor wavelets bandwidths. The final iris classifier consists of a weighted contribution of weak classifiers. As weak classifiers we use 3-split decision trees that identify a candidate based on the Levenshtein distance between phase(More)
The Scalable Coherent Interface (SCI) is an IEEE standard that deenes a hardware platform for scalable shared-memory multiprocessors. This paper contains a quantitative performance evaluation of an SCI-connected multi-processor that assesses both the communication and cache coherence subsystems. For the architecture and workload simulated, it was found that(More)
The development of embedded systems requires methodologies to enable the integration of different levels of abstraction and able to deal with functional and non-functional requirements. Many methodologies are proposed like Software Product Line (SPL) and Model-driven Engineering (MDE), in order to reduce the complexity of the development process. This paper(More)
The "popularity" of a memory word is the fraction of references to this word over the total of memory references in the execution of a program. In this paper we formally define the metric \emph{popularity of reference} and explain the reference patterns of the CommBench programs in terms of this metric. Our measurements indicate that embedded applications(More)
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