Search results for "interest"

Hits ?▲	Authors	Title	Venue	Year	Link	Author keywords
13	Han-Pang Chiu, Tomás Lozano-Pérez	Matching Interest Points Using Affine Invariant Concentric Circles.	ICPR (2)	2006	DBLP DOI BibTeX RDF
13	Jiajun Bu, Bo Jiang 0009, Chun Chen 0001, Jianxv Yang	Predicting User Interest Region for Collaborative Graphics Design Systems in Ubiquitous Environment.	CRIWG	2006	DBLP DOI BibTeX RDF
13	Casey Alt, Owen L. Astrachan, Jeffrey Forbes 0001, Richard Lucic, Susan H. Rodger	Social networks generate interest in computer science.	SIGCSE	2006	DBLP DOI BibTeX RDF	social networks, programming, computer science education
13	Xuehong Tao, Yuan Miao 0001, Zhiqi Shen 0001, Chunyan Miao, Nicola Yelland	Interest Based Negotiation Automation.	ICIC (3)	2006	DBLP DOI BibTeX RDF
13	Sira Rao, Nikil Jayant	Optimizing Algorithms for Region-of-Interest Video Compression, with Application to Mobile Telehealth.	ICME	2006	DBLP DOI BibTeX RDF
13	Kyhyun Um, Seongtaek Jo, Kyungeun Cho	An Extraction Technique of Optimal Interest Points for Shape-Based Image Classification.	MRCS	2006	DBLP DOI BibTeX RDF
13	Xuanzhe Liu, Gang Huang 0001, Hong Mei 0001	Towards Service Discovery and Subscription based on Community-of-Interest.	SOSE	2006	DBLP DOI BibTeX RDF
13	Heorhiy Byelas, Egor Bondarev, Alexandru C. Telea	Visualization of Areas of Interest in Component-Based System Architectures.	EUROMICRO-SEAA	2006	DBLP DOI BibTeX RDF
13	Dehui Zhang, Shaohua Tan, Shiwei Tang, Dongqing Yang, Lizheng Jiang	Adapting OLAP Analysis to the User's Interest Through Virtual Cubes.	FSKD	2006	DBLP DOI BibTeX RDF
13	Yiping Chu, Yin Zhang 0006, Sanyuan Zhang, Xiuzi Ye	Region of Interest Fragile Watermarking for Image Authentication.	IMSCCS (1)	2006	DBLP DOI BibTeX RDF
13	Yushi Nakai, Naoki Kamon, Yoshitaka Shibata	Scalable Collaborative Virtual Environment Considering User's Interest Information.	AINA (2)	2006	DBLP DOI BibTeX RDF
13	Rob Minson, Georgios Theodoropoulos 0001	Adaptive Interest Management via Push-Pull Algorithms.	DS-RT	2006	DBLP DOI BibTeX RDF
13	Taisuke Izumi, Toshimitsu Masuzawa	An Interest-Based Peer Clustering Algorithm Using Ant Paradigm.	BioADIT	2006	DBLP DOI BibTeX RDF
13	Carsten Oertel, Peter Bock	Identification of Objects-of-Interest in X-Ray Images.	AIPR	2006	DBLP DOI BibTeX RDF
13	Lisa M. Olivieri	High school environments and girls' interest in computer science.	ACM SIGCSE Bull.	2005	DBLP DOI BibTeX RDF	single-sex schools, education, computer science, women
13	Ali Jerbi, Jian Wang, Shahram Shirani	Error-resilient region-of-interest video coding.	IEEE Trans. Circuits Syst. Video Technol.	2005	DBLP DOI BibTeX RDF
13	Xinding Sun, Jonathan Foote, Don Kimber, B. S. Manjunath	Region of interest extraction and virtual camera control based on panoramic video capturing.	IEEE Trans. Multim.	2005	DBLP DOI BibTeX RDF
13	Li-bao Zhang	A New Region of Interest Image Coding for Narrowband Network: Partial Bitplane Alternating Shift.	NPC	2005	DBLP DOI BibTeX RDF
13	P. H. H. Rongen, J. Schröder, F. P. M. Dignum, J. Moorman	A Multi Agent Approach to Interest Profiling of Users.	CEEMAS	2005	DBLP DOI BibTeX RDF
13	Li-bao Zhang	Region of Interest Image Coding using IWT and Partial Bitplane Block Shift for Network Applications.	CIT	2005	DBLP DOI BibTeX RDF
13	Christopher E. Peters, Catherine Pelachaud, Elisabetta Bevacqua, Maurizio Mancini, Isabella Poggi	A Model of Attention and Interest Using Gaze Behavior.	IVA	2005	DBLP DOI BibTeX RDF
13	K. Sai Krishna, P. Radha Krishna 0001, Supriya Kumar De	Discovering Fuzzy Association Rules with Interest and Conviction Measures.	KES (4)	2005	DBLP DOI BibTeX RDF
13	Claudio Bettini, Nicolò Cesa-Bianchi, Daniele Riboni	A Distributed Architecture for Management and Retrieval of Extended Points of Interest.	ICDCS Workshops	2005	DBLP DOI BibTeX RDF
13	Mark E. Botkin, Hui-Ping Wang	An adaptive mesh refinement of quadrilateral finite element meshes based upon an a posteriori error estimation of quantities of interest: modal response.	Eng. Comput.	2004	DBLP DOI BibTeX RDF	Adaptive mesh generation, Error analysis, Error estimation, Finite element analysis, Modal analysis
13	Mahesh Subedar, Lina J. Karam, Glen P. Abousleman	JPEG2000-based shape adaptive algorithm for the efficient coding of multiple regions-of interest.	ICIP	2004	DBLP DOI BibTeX RDF
13	Lizhe Song, Zhendong Niu, Hantao Song, Zhengtao Yu 0001, Xuelin Shi	Usage of Hybrid Model Based on Concepts Correlations in Adaption to Changes of User's Interest.	ICADL	2004	DBLP DOI BibTeX RDF
13	Duke Gledhill, Gui Yun Tian, David Taylor, David Clarke	3D Reconstruction of a Region of Interest Using Structured Light and StereoPanoramic Images.	IV	2004	DBLP DOI BibTeX RDF
13	Tony Lindeberg, Amir Akbarzadeh, Ivan Laptev	Galilean-Diagonalized Spatio-Temporal Interest Operators.	ICPR (1)	2004	DBLP DOI BibTeX RDF
13	Paul Miki Willy, Karl-Heinz Küfer	Content-based Medical Image Retrieval (CBMIR): An Intelligent Retrieval System for Handling Multiple Organs of Interest.	CBMS	2004	DBLP DOI BibTeX RDF
13	Mohammed Yeasin, B. Bullot, Rajeev Sharma	From Facial Expression to Level of Interest: A Spatio-Temporal Approach.	CVPR (2)	2004	DBLP DOI BibTeX RDF
13	Jiu Jun Chen, Ji Gao, Bei Shui Liao, Jun Hu	Dynamic Semantic Clustering Approach for Web User Interest.	GCC Workshops	2004	DBLP DOI BibTeX RDF
13	Xiaole Bai, Shuping Liu, Peng Zhang 0004, Raimo Kantola	ICN: Interest-Based Clustering Network.	Peer-to-Peer Computing	2004	DBLP DOI BibTeX RDF
13	Jeremiah Scholl, Stefan Elf, Peter Parnes	User-Interest Driven Video Adaptation for Collaborative Workspace Applications.	Networked Group Communication	2003	DBLP DOI BibTeX RDF
13	Xiaoming Chen, Xuan Zhou 0007, Richard B. Scherl, James Geller	Using an Interest Ontology for Improved Support in Rule Mining.	DaWaK	2003	DBLP DOI BibTeX RDF
13	Sandy Graham, Celine Latulipe	CS girls rock: sparking interest in computer science and debunking the stereotypes.	SIGCSE	2003	DBLP DOI BibTeX RDF	enrichment program, diversity, gender, stereotypes, women, high school, enrollment
13	Jeffrey Heer, Stuart K. Card	Efficient user interest estimation in fisheye views.	CHI Extended Abstracts	2003	DBLP DOI BibTeX RDF	information visualization, focus+context, fisheye view
13	Mujtaba Khambatti, Kyung Dong Ryu, Partha Dasgupta	Structuring Peer-to-Peer Networks Using Interest-Based Communities.	DBISP2P	2003	DBLP DOI BibTeX RDF
13	Ivan Laptev, Tony Lindeberg	Interest Point Detection and Scale Selection in Space-Time.	Scale-Space	2003	DBLP DOI BibTeX RDF
13	Gareth Loy, Alexander Zelinsky	A Fast Radial Symmetry Transform for Detecting Points of Interest.	ECCV (1)	2002	DBLP DOI BibTeX RDF
13	Mojtaba Hosseini, Steve Pettifer, Nicolas D. Georganas	Visibility-based interest management in collaborative virtual environments.	CVE	2002	DBLP DOI BibTeX RDF	AoIM, CVE
13	Mark Claypool, David Brown, Phong Le, Makoto Waseda	Inferring User Interest.	IEEE Internet Comput.	2001	DBLP DOI BibTeX RDF
13	Xinding Sun, Jonathan Foote, Don Kimber, B. S. Manjunath	Recording the region of interest from FlyCam panoramic video.	ICIP (1)	2001	DBLP DOI BibTeX RDF
13	Christian Wolf 0001, Walter G. Kropatsch, Horst Bischof, Jean-Michel Jolion	Content Based Image Retrieval Using Interest Points and Texture Features.	ICPR	2000	DBLP DOI BibTeX RDF
13	Dimitris A. Karras, S. A. Karkanis, Dimitrios E. Maroulis	Efficient Image Compression of Medical Images Using the Wavelet Transform and Fuzzy c-means Clustering on Regions of Interest.	EUROMICRO	2000	DBLP DOI BibTeX RDF
13	Emmanuel Etiévent, Frank Lebourgeois, Jean-Michel Jolion	Assisted Video Sequences Indexing: Motion Analysis based on Interest Points.	ICIAP	1999	DBLP DOI BibTeX RDF
13	Daniel Reisfeld	Constrained Phase Congruency: Simultaneous Detection of Interest Points and of their Scales.	CVPR	1996	DBLP DOI BibTeX RDF	registration, symmetry, scale-space, phase congruency
12	Hady Wirawan Lauw, John C. Shafer, Rakesh Agrawal 0001, Alexandros Ntoulas	Homophily in the Digital World: A LiveJournal Case Study.	IEEE Internet Comput.	2010	DBLP DOI BibTeX RDF	Internet, social network, interest, friendship, homophily
12	Anil K. Jain 0001, Jianjiang Feng, Karthik Nandakumar	Fingerprint Matching.	Computer	2010	DBLP DOI BibTeX RDF	Biometrics, Pattern matching, Security and privacy, Fingerprint identification, General interest and reference
12	Karin K. Breitman, Markus Endler, Rafael Pereira, Marcello Azambuja	When TV Dies, Will It Go to the Cloud?	Computer	2010	DBLP DOI BibTeX RDF	Media technologies, Cloud computing, Internet/Web, General interest and reference
12	David Alan Grier	Raising Barns.	Computer	2010	DBLP DOI BibTeX RDF	Computing profession, Computers and society, General interest and reference
12		Kudos to Bob Glass and Rebecca Wirfs-Brock.	IEEE Softw.	2010	DBLP DOI BibTeX RDF	General interest, software engineering, standards and best practices
12	Yuheng Ren, Mo Yu, Xin-Jing Wang, Lei Zhang 0001, Wei-Ying Ma	Diversifying landmark image search results by learning interested views from community photos.	WWW	2010	DBLP DOI BibTeX RDF	landmark image search, set-based ranking, user interest modeling
12	Albrecht Schmidt 0001, Anind K. Dey, Andrew L. Kun, Wolfgang Spiessl	Automotive user interfaces: human computer interaction in the car.	CHI Extended Abstracts	2010	DBLP DOI BibTeX RDF	car entertainment, driver interaction, vehicular information systems, cars, automotive industry, driver information systems, special interest group
12	Cheng Wang, Shaofa Li, Kai He, Zhengchun Lin, Changjin Jiang	Automatic Image Segmentation Using Pulse Coupled Neural Network and Independent Component Analysis.	MVHI	2010	DBLP DOI BibTeX RDF	image segmentation, Independent Component Analysis, regions of interest, Pulse Coupled Neural Network
12	Eric Becker, Roman Arora, Scott Phan, Jyothi K. Vinjumur, Fillia Makedon	Extending event-driven experiments for human activity for an assistive environment.	PETRA	2010	DBLP DOI BibTeX RDF	Baum-Welch modification, episodic events, events of interest, wireless sensor networks, database, assistive environments, human activity
12	Marcin Gorawski, Pawel Jureczek	A Proposal of Spatio-Temporal Pattern Queries.	CISIS	2010	DBLP DOI BibTeX RDF	pattern query, contiguous sequential pattern, performance analysis, region of interest, data mining algorithm
12	Kenneth O. Kortanek, Vladimir G. Medvedev	Semi-infinite Programming and Applications in Finance.	Encyclopedia of Optimization	2009	DBLP DOI BibTeX RDF	Duality equality, Supports problems method, Nonstochastic uncertainty, Term structure of interest rates, Term to maturity, Dynamical system, Perturbations, Optimality conditions
12	David Alan Grier	The Dictator and the Web Design.	Computer	2009	DBLP DOI BibTeX RDF	Web design, Computing profession, Computers and society, General interest and reference
12	Bob Ward	IEEE Foundation Gives Away More Than $300, 000.	Computer	2009	DBLP DOI BibTeX RDF	IEEE Foundation, Awards and grants, General interest and reference
12	Bob Ward	Computer Society Connection.	Computer	2009	DBLP DOI BibTeX RDF	IEEE Computer Society, Conferences, General interest and reference
12	W. Neville Holmes	The Design of Government.	Computer	2009	DBLP DOI BibTeX RDF	Computing profession, Computers and society, General interest and reference
12	David Alan Grier	The Character of Play.	Computer	2009	DBLP DOI BibTeX RDF	Computing profession, Computers and society, General interest and reference
12	David Alan Grier	Welcome to the Family.	Computer	2009	DBLP DOI BibTeX RDF	IAS machines, IBM System 360, Computing profession, General interest and reference
12	Jan Sochman, Jiri Matas	Learning Fast Emulators of Binary Decision Processes.	Int. J. Comput. Vis.	2009	DBLP DOI BibTeX RDF	Sequential probability ratio test, WaldBoost, Interest point detectors, Machine learning, Boosting, AdaBoost, Sequential decision making
12	Cécile Paris, Stephen Wan 0001	Capturing the User's Reading Context for Tailoring Summaries.	UMAP	2009	DBLP DOI BibTeX RDF	user’s interest, tailored summaries, browsing support tool
12	Devin Smith, Zachary Dodds	Visual navigation: image profiles for odometry and control.	SAC	2009	DBLP DOI BibTeX RDF	interest operators, vision-based robot control, visual odometry
12	Christian Bettinger, Andreas Baumann, Frank Hausen, Georg Schneider 0002, Hermann Schloss	HERA: Design Framework for Decentralized Distributed Virtual Environments and Games.	NCM	2009	DBLP DOI BibTeX RDF	Distributed Peer-to-Peer Architectures, Game Application, Scalability, Consistency, Area of Interest Management
12	Shih-Hsiang Lo, Cheng-An Chiu, Fang-Ping Pai, Ding-Yong Hong, Yeh-Ching Chung	MGRID: a modifiable-grid region matching approach for DDM in the HLA RTI.	SpringSim	2009	DBLP DOI BibTeX RDF	high level architecture, interest management, data distribution management
12	Ting Zhan, Xuancang Wang	Application for Matter-Element Model in Eco-environment Impact Assessment of Tourism Highway.	ESIAT (2)	2009	DBLP DOI BibTeX RDF	tourism highway, eco-environment impact, matter-element model, interest relationship, matlab7
12	Lei Zhang, Paul Coulton	A mobile geo-wand enabling gesture based POI search an user generated directional POI photography.	Advances in Computer Entertainment Technology	2009	DBLP DOI BibTeX RDF	user interface, mobile, search, navigation, gesture, location, spatial, photo, point of interest
12	Yongjun Jing, Xin Li 0027, Shaochun Zhong	Research on Personalized Services for Users of Education Resources Net.	HIS (3)	2009	DBLP DOI BibTeX RDF	User's Interest, Time-window Theory, Vector Space Model, Personalized Service, Education Resources
12	Nafaâ Jabeur, Hedi Haddad	Using Causality Relationships for a Progressive Management of Hazardous Phenomena with Sensor Networks.	ICCSA (1)	2009	DBLP DOI BibTeX RDF	Hazard monitoring, Sensor network, Event, Conceptual graph, Area of interest, Causality relationships
12	Jaekyong Jeong, Chijung Hwang, Byeungwoo Jeon	An efficient method of image identification by combining image features.	ICUIMC	2009	DBLP DOI BibTeX RDF	image identification, clustering, image retrieval, identifier, local feature, feature point, descriptor, interest point, global feature
12	Kenji Nakamura, Takashi Toriu, Shigeyoshi Nakajima, Hiromitsu Hama	An Attention Focusing Tree Based on Saliency and a Display Method for Small Displays.	IIH-MSP	2009	DBLP DOI BibTeX RDF	Vidusl attention, display method for small devices, region of interest, saliency
12	Chao Song, Muyun Yang, Haoliang Qi, Sheng Li 0003	A Kappa Measurement of Query Consistency and Its Application.	IALP	2009	DBLP DOI BibTeX RDF	Kappa, query interest consistency, distribution, Dice
12	Chang Sheng, Wynne Hsu, Mong-Li Lee	Discovering geographical-specific interests from web click data.	LocWeb	2008	DBLP DOI BibTeX RDF	geographic-specific interest pattern, spatio-temporal data, influence model
12	Omer Eroglu, Haci Ali Mantar, Fatih Erdogan Sevilgen	Quadtree-based approach to data distribution management for distributed simulations.	SpringSim	2008	DBLP DOI BibTeX RDF	distributed simulation, HLA, quadtree, interest management, data distribution management
12	Stanislavs Bardins, Tony Poitschke, Stefan Kohlbecher	Gaze-based interaction in various environments.	VNBA	2008	DBLP DOI BibTeX RDF	gaze-in-space, stereo camera system, calibration, gaze tracking, area-of-interest
12	Shawn D. Newsam, Yi Yang 0016	Integrating gazetteers and remote sensed imagery.	GIS	2008	DBLP DOI BibTeX RDF	geospatial objects, Markov random fields, information integration, appearance modeling, appearance models, interest points, gazetteers, remote sensed imagery
12	Farzin Yaghmaee, Mansour Jamzad	Introducing a New Method for Estimation Image Complexity According To Calculate Watermark Capacity.	IIH-MSP	2008	DBLP DOI BibTeX RDF	Complexity, Capacity, Region Of Interest (ROI), Image Watermarking
12	Jing-Wein Wang	Face Localization in Cluttered Background.	IIH-MSP	2008	DBLP DOI BibTeX RDF	Extrema density, Face-of-interest (FOI), Head contour detection (HCD), Face localization
12	Byung-Chull Bae, Robert Michael Young	A Use of Flashback and Foreshadowing for Surprise Arousal in Narrative Using a Plan-Based Approach.	ICIDS	2008	DBLP DOI BibTeX RDF	Flashback, Foreshadowing, Prolepsis, Analepsis, Surprise Arousal, Cognitive Interest, Narrative, Story Generation
12	Bruno Antunes, Ana Alves 0001, Francisco C. Pereira	Semantics of Place: Ontology Enrichment.	IBERAMIA	2008	DBLP DOI BibTeX RDF	Semantic of Place, Ontology Enrichment, Ontologies, Place, Point of Interest, Ontology Evaluation
12	Lester C. Loschky, Gary S. Wolverton	How late can you update gaze-contingent multiresolutional displays without detection?.	ACM Trans. Multim. Comput. Commun. Appl.	2007	DBLP DOI BibTeX RDF	blur detection, contrast thresholds, display updates, perceptual compression, saccadic suppression, eye tracking, level-of-detail, bandwidth, visual perception, multiresolution, eye movements, saccades, peripheral vision, foveated, foveation, area of interest, Gaze-contingent
12	Ihab Kazem, Dewan Tanvir Ahmed, Shervin Shirmohammadi	A zone based architecture for massively multi-user simulations.	SpringSim (1)	2007	DBLP BibTeX RDF	multi-user collaboration, virtual environments, application layer multicasting, massively multiplayer online games, area of interest management
12	Jun Yang 0003, Yu-Gang Jiang, Alexander G. Hauptmann, Chong-Wah Ngo	Evaluating bag-of-visual-words representations in scene classification.	Multimedia Information Retrieval	2007	DBLP DOI BibTeX RDF	local interest point, scene classification, keypoint, bag-of-visual-words
12	Phichet Trisiripisal, Sang-Mook Lee, A. Lynn Abbott	Iterative Image Coding Using Hybrid Wavelet-Based Triangulation.	MMM (1)	2007	DBLP DOI BibTeX RDF	Image compression and coding, multimedia, segmentation, wavelet transform, triangulation, region-of-interest, multiresolution analysis
12	Shang Hwa Hsu, Ming-Hui Wen, Hsin-Chieh Lin, Chun-Chia Lee, Chia-Hoang Lee	AIMED- A Personalized TV Recommendation System.	EuroITV	2007	DBLP DOI BibTeX RDF	TV program recommendation system, activity, mood, personal information, interest, lifestyle, predictor
12	Conor Muldoon, Gregory M. P. O'Hare, John F. Bradley	Towards reflective mobile agents for resource-constrained mobile devices.	AAMAS	2007	DBLP DOI BibTeX RDF	self-interest, ubiquitous computing, mobile-agents, practical reasoning
12	Jinyuan Jia, Ping Wang, Sen Wang, Yuying Wang	An Integer Incremental AOI Algorithm for Progressive Downloading of Large Scale VRML Environments.	Edutainment	2007	DBLP DOI BibTeX RDF	AOI (Area of Interest), DDA (Digital Differential Algorithm), VRML, Distributed Virtual Environment, Progressive Transmission, Temporal Coherence, Spatial Coherence
12	Michael Hahsler	A Model-Based Frequency Constraint for Mining Associations from Transaction Data.	Data Min. Knowl. Discov.	2006	DBLP DOI BibTeX RDF	interest measures, Data mining, mixture models, associations, transaction data
12	Hui Zhang 0010, Rouhollah Rahmani, Sharath R. Cholleti, Sally A. Goldman	Local image representations using pruned salient points with applications to CBIR.	ACM Multimedia	2006	DBLP DOI BibTeX RDF	image retrieval, multiple instance learning, content-based, feature representation, interest points, salient points
12	Mik Kersten, Gail C. Murphy	Using task context to improve programmer productivity.	SIGSOFT FSE	2006	DBLP DOI BibTeX RDF	program views, IDE, task management, interaction history, degree-of-interest
12	Dennis F. Galletta, Ping Zhang 0002, Fiona Fui-Hoon Nah	AIS SIGHCI position paper.	CHI Extended Abstracts	2005	DBLP DOI BibTeX RDF	professional associations, HCI, publications, multidisciplinary, special interest groups
12	Barbara Helfer	ACM SIGGRAPH user experience initiatives.	CHI Extended Abstracts	2005	DBLP DOI BibTeX RDF	cooperating societies, user experience, UX, special interest groups
12	Gerhard Fischer	Distances and diversity: sources for social creativity.	Creativity & Cognition	2005	DBLP DOI BibTeX RDF	spatial distance, technological distance, temporal distance, design, diversity, communities of practice, social creativity, division of labor, communities of interest
12	A. V. U. Phani Kumar, Adi Mallikarjuna Reddy V, D. Janaki Ram	Distributed collaboration for event detection in wireless sensor networks.	MPAC	2005	DBLP DOI BibTeX RDF	event of interest, simple event, wireless sensor networks, collaboration, middleware, protocol, event, publish/subscribe, composite event
12	Emmanuel Léty, Thierry Turletti, François Baccelli	SCORE: a scalable communication protocol for large-scale virtual environments.	IEEE/ACM Trans. Netw.	2004	DBLP DOI BibTeX RDF	area of interest manager (AOIM), cell-based grouping, large-scale virtual environments (LSVE), multiple multicast groups, scalability, communication protocol
12	David M. Pennock	Conference report: the fifth ACM conference on electronic commerce.	SIGecom Exch.	2004	DBLP DOI BibTeX RDF	association for computing machinery (ACM) conference on electronic commerce (EC'04) report and summary, special interest group on electronic commerce (SIGecom), design, algorithms, human factors, theory, experimentation, economics, ecommerce
12	Zoran Zivkovic, Ferdinand van der Heijden	Improving the selection of feature points for tracking.	Pattern Anal. Appl.	2004	DBLP DOI BibTeX RDF	Feature (interest) point selection, Convergence region, Robustness, Motion estimation, Optical flow, Visual tracking