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We present a novel method for generic visual catego-rization: the problem of identifying the object content of natural images while generalizing across variations inherent to the object class. This bag of keypoints method is based on vector quantization of affine invariant descriptors of image patches. We propose and compare two alternative implementations(More)
We present a novel method for generic visual categorization: the problem of identifying the object content of natural images while generalizing across variations inherent to the object class. This bag of keypoints method is based on vector quantization of affine invariant descriptors of image patches. We propose and compare two alternative implementations(More)
CLF/Mekano is a distributed object infrastructure oriented towards the high-level coordination of coarse grain components. Unlike other infrastructures of the same class, such as CORBA or DCOM, coordination in CLF/Mekano is built-in at the lowest level, namely at the inter-component communication protocol level, and not as a side service (such as the event,(More)
In this paper we present STITCH, a middleware that facilitates the development of ubiquitous user-centric and context-aware applications. These systems are built from distributed components which are highly heterogeneous, covering a large range of hardware configurations, from sensors to computers, and with software ranging from embedded software with small(More)
In complex domains such as scientiic computing, users need support in choosing, chaining, and executing the adequate programs for problem solving. Problem solving environments are developed in order to solve automatically routine problems, decomposing them recursively in more and more elementary subproblems, and nally executing the corresponding programs.(More)
Nowadays people have to deal with an increasing amount of information contained in electronic documents available from numerous heterogeneous, widely distributed sources. Keeping up to date with recently published material relevant to a particular topic has become a challenge in itself. The Yaka system aims at facilitating this task by providing(More)
Local governments are seeking effective ways to promote sustainable commuting for reducing energy consumption and improving commuters' experience. We present a three-pronged field study of transportation practices, focusing on commuters, organizations, and public administrators. In this position paper we describe the study, our preliminary findings,(More)
We have designed the Personal Assessment Tool (PAT) to promote more sustainable print behaviour in a corporate work environment. Therefore, PAT provides its users with ambient awareness on their printing habits. We have experimented PAT in our research centre and describe this experiment along with our findings and observations. PAT definitely motivated the(More)
This paper describes how achieving consistent colour reproduction across different devices is a complicated matter. Although there is a technological infrastructure for managing colour across devices this is very rarely used as intended. This infrastructure has been created by modelling the problem of colour management as a wholly technical one. In this(More)