Technical Reports (Computing Science)
Technical Reports Collection
Items in this Collection
- 14Nascimento, Mario
- 4Malhotra, Baljeet
- 3Nikolaidis, Ioanis
- 2Chitkara, Vishal
- 2Coman, Alexandru
- 2Falcao, Alexandre
- 6Database Systems
- 3Communication Networks
- 3Sensor networks
- 2Color histograms
- 2Color-based image retrieval
- 2Content-based image retrieval
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2009
Nikolaidis, Ioanis, Nascimento, Mario A., Malhotra, Baljeet
Technical report TR09-01. Finding the top-k values is an important type of aggregation query in wireless sensor networks. Previous proposals relied on a given underlying logical tree topology for data aggregation/forwarding, but did not pay due attention to the role of such topology. In this...
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Cell Histograms Versus Color Histograms for Image Representation and Retrieval
2001
Nascimento, Mario, Falcao, Alexandre, Stehling, Renato
Technical report TR01-01. Color is a commonly used feature for realizing content-based image retrieval (CBIR). In this context, this paper presents a new approach for CBIR which is based on well known and widely used color histograms. Previous approaches have used a single global color...
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2006
Nascimento, Mario, Coman, Alexandru, Sander, Joerg
Technical report TR06-24. Wireless sensor networks have received much attention recently. Given their autonomy, flexibility and large range of functionality, they can be used as an effective and discrete means for monitoring data in many domains. Typically the network autonomy implies a limited...
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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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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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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 ...
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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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2008
Malhotra, Baljeet, Lin, Guohui
Technical report TR08-07. In gene expression microarray data analysis, biclustering has been demonstrated to be one of the most effective methods for discovering gene expression patterns under various conditions. We present in this study a framework to take advantage of the homogeneously...
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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,...