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Skip to Search Results- 14Nascimento, Mario
- 2Chitkara, Vishal
- 2Coman, Alexandru
- 2Falcao, Alexandre
- 2Malhotra, Baljeet
- 2Nikolaidis, Ioanis
- 5Database Systems
- 2Color histograms
- 2Color-based image retrieval
- 2Communication Networks
- 2Content-based image retrieval
- 2Sensor networks
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2009
Malhotra, Baljeet, Nikolaidis, Ioanis, Nascimento, Mario
Technical report TR09-14. We consider the problem of aggregation convergecast scheduling in wireless sensor networks. Aggregation convergecast differs from regular convergecast in that it accommodates transmission dependencies that allow in-network aggregation to be performed. We formulate the...
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2005
Nascimento, Mario, Sander, Joerg, Coman, Alexandru
Technical report TR05-23. Wireless sensor networks are made of autonomous devices that are able to collect information, store it, process it and share it with other devices. Such framework can be used to efficiently query spatiotemporal data, e.g., for monitoring humidity and temperature levels...
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Content-Based Image Retrieval Using Binary Signatures
2000
Nascimento, Mario, Chitkara, Vishal, Mastaller, Curt
Technical report TR00-18. Significant research has focused on determining efficient methodologies for retrieving images in large image databases. In this paper, we propose two variations of a new image abstraction technique based on signature bit-strings and an appropriate similarity metric. The...
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An Adaptive and Efficient Clustering-based Approach for Content Based Image Retrieval in Image Databases
An Adaptive and Efficient Clustering-based Approach for Content Based Image Retrieval in Image Databases
Download2001
Stehling, Renato, Falcao, Alexandre, Nascimento, Mario
Technical report TR01-03. In this paper, we present a new Content-Based Image Retrieval (CBIR) approach which is based on cluster analysis. A distinguishing aspect of CBIR is that it relies on a visual content representation (metadata) of the images. In order to produce such metadata, we propose...
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A Unified Framework for Searching Multiple Compressed Collections
2001
Nascimento, Mario, Oliveira, Stanley
Technical report TR01-17. In this work, we propose a new framework for searching directly through multiple compressed collections. We combine, in a single framework, four techniques for efficient, low-overhead text retrieval: inverted index compression, block addressing, sequential searching in...
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2008
Nikolaidis, Ioanis, Nascimento, Mario, Malhotra, Baljeet
Technical report TR08-02. We consider the problem of vehicle classification using acoustic signals captured within a sensor network. The sensors perform collaborative decision and/or data fusion in a distributed and energy efficient manner. We present a distributed cluster-based algorithm,...
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On the Trade-Off Between User-Location Privacy and Queried-Location Privacy in Wireless Sensor Networks
Download2009
Harms, Janelle, Vogt, Ryan, Nascimento, Mario
Technical report TR09-07. By eavesdropping on a user's query in a sensor network, an adversary can deduce both the user's location and his/her area of interest. In many domains it is desirable to guarantee privacy of both places. Relying on the principle of k-anonymity, we propose an effective...
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2013
Nascimento, Mario, Wang, Zhiyu, MacGregor, Mike
Mobile objects can be equipped with sensors enabling them to collect data, as well as answer queries remotely and in real-time. For that, one needs to be able to effectively route queries from a base station to the queried object in an efficient way, i.e., with minimum energy-cost and/or minimum...
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Color Based Image Retrieval Using Signature Trees
2001
Manolopoulos, Yannis, Chitkara, Vishal, Tousidou, Eleni, Nascimento, Mario
Technical report TR01-02. Significant research has focused on determining efficient methodologies for effective and speedy retrieval in large image databases. Towards that goal, the first contribution of this paper is an image abstraction technique, called VBA, based on signature bit-strings and...
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Benchmarking Access Structures for High-Dimensional Multimedia Data
1999
Nascimento, Mario, Colossi, Nathan
Technical report TR99-05. In multimedia databases it is usual to map objects into feature vectors in high-dimensional spaces. In order to speed query processing access structures, or indices, are required. Unfortunately, in the case of similarity queries, which are in fact nearest neighbor ...