42 research outputs found
Reconfigurable Inverted Index
Existing approximate nearest neighbor search systems suffer from two
fundamental problems that are of practical importance but have not received
sufficient attention from the research community. First, although existing
systems perform well for the whole database, it is difficult to run a search
over a subset of the database. Second, there has been no discussion concerning
the performance decrement after many items have been newly added to a system.
We develop a reconfigurable inverted index (Rii) to resolve these two issues.
Based on the standard IVFADC system, we design a data layout such that items
are stored linearly. This enables us to efficiently run a subset search by
switching the search method to a linear PQ scan if the size of a subset is
small. Owing to the linear layout, the data structure can be dynamically
adjusted after new items are added, maintaining the fast speed of the system.
Extensive comparisons show that Rii achieves a comparable performance with
state-of-the art systems such as Faiss.Comment: ACMMM 2018 (oral). Code: https://github.com/matsui528/ri
Handbook of Vascular Biometrics
This open access handbook provides the first comprehensive overview of biometrics exploiting the shape of human blood vessels for biometric recognition, i.e. vascular biometrics, including finger vein recognition, hand/palm vein recognition, retina recognition, and sclera recognition. After an introductory chapter summarizing the state of the art in and availability of commercial systems and open datasets/open source software, individual chapters focus on specific aspects of one of the biometric modalities, including questions of usability, security, and privacy. The book features contributions from both academia and major industrial manufacturers
Speech Recognition
Chapters in the first part of the book cover all the essential speech processing techniques for building robust, automatic speech recognition systems: the representation for speech signals and the methods for speech-features extraction, acoustic and language modeling, efficient algorithms for searching the hypothesis space, and multimodal approaches to speech recognition. The last part of the book is devoted to other speech processing applications that can use the information from automatic speech recognition for speaker identification and tracking, for prosody modeling in emotion-detection systems and in other speech processing applications that are able to operate in real-world environments, like mobile communication services and smart homes
Seventh International Workshop on Simulation, 21-25 May, 2013, Department of Statistical Sciences, Unit of Rimini, University of Bologna, Italy. Book of Abstracts
Seventh International Workshop on Simulation, 21-25 May, 2013, Department of Statistical Sciences, Unit of Rimini, University of Bologna, Italy. Book of Abstract
Seventh International Workshop on Simulation, 21-25 May, 2013, Department of Statistical Sciences, Unit of Rimini, University of Bologna, Italy. Book of Abstracts
Seventh International Workshop on Simulation, 21-25 May, 2013, Department of Statistical Sciences, Unit of Rimini, University of Bologna, Italy. Book of Abstract