Jakub Lokoč, Ph.D.

lokoc<at>ksi.mff.cuni.cz
assistant professor

Research groups

Siret

Research topics

  • similarity search in unstructured data
  • metric and nonmetric indexing
  • content based retrieval
  • multimedia databases

Teachingtop

CodeTitleLinks
NDBI016Transactions
NDBI025Database Systems
NDBI045Video retrieval and exploration
NPRG045Individual Software Project
NSWI122Dissertation Thesis Preparation

Ph.D. studentstop

Current: Přemysl Čech, M.Sc.

Supervised thesestop

TitleStudentTypeStartedDefended
Application of artificial neural networks for malware detection in HTTPS trafficJan BodnárBS20172017
Detection of malignant melanoma in histological sample using deep neural networksAdam FreyBS20172017
Object recognition using 3D convolutional neural networksJaroslav MoravecBS20162017
Effective visualization for interactive video explorationJan PavlovskýBS20162017
(show all)

Research grantstop

  • Efficient subgraph discovery for petabyte-scale web analysis (GACR 15-08916S) 2015-2017 head investigator
  • Synergistic Modeling of Adaptive Similarities for Multimedia Retrieval (GACR P202/12/P297) 2012-2014 head investigator
  • Similarity Searching in Very Large Multimedia Databases (GACR 201/09/0683) 2009-2011 cooperant
  • Distributed and Parallel Metric Indexing in Multimedia Databases (GAUK 18208) 2008-2010 head investigator
  • Modern methods and applications of software engineering (GAUK SVV-2010-261312) 2010-2010 cooperant
  • (show all)

Publicationstop

2016

Refereed (journals/proceedings) (7)

  • Blažek A., Kuboň D., Lokoč J.: Known-Item Search in Video Databases with Textual Queries, in Similarity Search and Applications, Tokyo, Springer International Publishing, ISBN: 978-3-319-46758-0, ISSN: 0302-9743, pp. 117-124, 2016
  • Čech P., Kohout J., Lokoč J., Komárek T., Maroušek J., Pevný T.: Feature Extraction and Malware Detection on Large HTTPS Data Using MapReduce, in Similarity Search and Applications, Tokyo, Springer International Publishing, ISBN: 978-3-319-46758-0, ISSN: 0302-9743, pp. 311-324, 2016
  • Galuščáková P., Batko M., Kruliš M., Lokoč J., Novák D., Pecina P.: CUNI at TRECVID 2015 Video Hyperlinking Task, in 2015 TREC Video Retrieval Evaluation Notebook Papers and Slides, Gaithersburg, Maryland, United States, NIST, pp. 1-7, 2016 - text
  • Kuboň D., Blažek A., Lokoč J., Skopal T.: Multi-sketch Semantic Video Browser, in MultiMedia Modeling, Miami, FL, USA, Springer International Publishing, ISBN: 978-3-319-27673-1, ISSN: 0302-9743, pp. 406-411, 2016
  • Lokoč J., Kohout J., Čech P., Skopal T., Pevný T.: k-NN Classification of Malware in HTTPS Traffic Using the Metric Space Approach, in Intelligence and Security Informatics, Auckland, New Zealand, Springer International Publishing, ISBN: 978-3-319-31862-2, ISSN: 0302-9743, pp. 131-145, 2016
  • Macík M., Lokoč J., Čech P., Skopal T.: Particle physics model for content-based 3D exploration, in Content-Based Multimedia Indexing (CBMI), 2016, Bucharest, Romania, IEEE Computer Society, ISBN: 978-1-4673-8695-1, pp. 1-6, 2016
  • Osipyan H., Lokoč J., Marchand-Maillet S.: Similarity Search of Sparse Histograms on GPU Architecture, in Similarity Search and Applications, Tokyo, Springer International Publishing, ISBN: 978-3-319-46758-0, ISSN: 0302-9743, pp. 325-338, 2016

2015

Refereed (journals/proceedings) (8)

  • Blažek A., Lokoč J., Matzner F., Skopal T.: Enhanced Signature-based Video Browser, in MultiMedia Modeling, Sydney, Australia, Springer International Publishing, ISBN: 978-3-319-14441-2, ISSN: 0302-9743, pp. 243-248, 2015 - text
  • Grošup T., Čech P., Lokoč J., Skopal T.: A Web Portal For Effective Multi-model Exploration, in MultiMedia Modeling, Sydney, Australia, Springer International Publishing, ISBN: 978-3-319-14441-2, ISSN: 0302-9743, pp. 315-318, 2015 - text
  • [IF Journal]Kruliš M., Lokoč J., Skopal T.: Efficient Extraction of Clustering-Based Feature Signatures Using GPU Architectures, in Multimedia Tools and Applications, Vol. 2015, Num. 27.6.2015, ISSN: 1380-7501, pp. 1-33, 2015 - text
  • [Journal (without IF)]Lokoč J.: Approximating adaptive distance measures using scalable feature signatures, in Multimedia Tools and Applications, Vol. 2015/74, Num. December 2015, ISSN: 1380-7501, pp. 11569-11594, 2015 - text
  • Lokoč J., Münzer B., Schoeffmann K., del Fabro M., Primus M. J., Skopal T., Lánský J.: What are the salient keyframes in short casual videos? an extensive user study using a new video dataset, in 2015 IEEE International Conference on Multimedia & Expo Workshops (ICMEW), Turin, Italy, IEEE, ISBN: 978-1-4799-7079-7, pp. 1-6, 2015 - text
  • Lokoč J., Schoeffmann K., del Fabro M.: Dynamic Hierarchical Visualization of Keyframes in Endoscopic Video, in MultiMedia Modeling, Sydney, Australia, Springer International Publishing, ISBN: 978-3-319-14441-2, ISSN: 0302-9743, pp. 291-294, 2015 - text
  • Moško J., Lokoč J., Grošup T., Čech P., Skopal T., Jan L.: Evaluating Multilayer Multimedia Exploration, in Lecture Notes in Computer Science, Glasgow, Springer, ISBN: 978-3-319-25087-8, ISSN: 0302-9743, pp. 162-169, 2015 - text
  • Moško J., Lokoč J., Grošup T., Čech P., Skopal T., Jan L.: MLES: Multilayer Exploration Structure for Multimedia Exploration, in Communications in Computer and Information Science, Poitiers, Springer, ISBN: 978-3-319-23201-0, ISSN: 1865-0929, pp. 135-144, 2015 - text

2014

Refereed (journals/proceedings) (8)

  • Blažek A., Lokoč J., Skopal T.: Video Retrieval with Feature Signature Sketches, in Similarity Search and Applications, San Jose Los Cabos, Mexico, Springer International Publishing, ISBN: 978-3-319-11987-8, ISSN: 0302-9743, pp. 25-36, 2014
  • Galuščáková P., Kruliš M., Lokoč J., Pecina P.: CUNI at MediaEval 2014 Search and Hyperlinking Task: Visual and Prosodic Features in Hyperlinking, accepted for publication in Working Notes Proceedings of the MediaEval 2014 Workshop, Barcelona, Spain, CEUR-WS.org, ISSN: 1613-0073, pp. 1-2, 2014 - Biblio (ÚFAL)
  • Lokoč J.: Approximating the Signature Quadratic Form Distance Using Scalable Feature Signatures, in MultiMedia Modeling (Lecture Notes in Computer Science), Dublin, Ireland, Springer International Publishing, ISBN: 978-3-319-04113-1, ISSN: 0302-9743, pp. 86-97, 2014
  • Lokoč J., Blažek A., Skopal T.: On Effective Known Item Video Search Using Feature Signatures, in ICMR '14 Proceedings of International Conference on Multimedia Retrieval, Glasgow, United Kingdom, ACM, ISBN: 978-1-4503-2782-4, pp. 524-526, 2014
  • Lokoč J., Blažek A., Skopal T.: Signature-based Video Browser, in MultiMedia Modeling, Dublin, Ireland, Springer International Publishing, ISBN: 978-3-319-04116-2, ISSN: 0302-9743, pp. 415-418, 2014
  • Lokoč J., Grošup T., Čech P., Skopal T.: Towards efficient multimedia exploration using the metric space approach, in Content-Based Multimedia Indexing (CBMI), 2014, Klagenfurt, Austria, IEEE Computer Society, ISBN: 978-1-4799-3990-9, ISSN: 1949-3991, pp. 1-4, 2014
  • Lokoč J., Moško J., Čech P., Skopal T.: On indexing metric spaces using cut-regions, in Information Systems, Vol. 43, Num. July, ISSN: 0306-4379, pp. 1-19, 2014
  • Moško J., Skopal T., Bartoš T., Lokoč J.: Real-Time Exploration of Multimedia Collections, in Lecture Notes in Computer Science, Brisbane, QLD, Australia, Springer, ISBN: 978-3-319-08608-8, ISSN: 0302-9743, pp. 198-205, 2014

2013

Refereed (journals/proceedings) (4)

  • Hetland M. L., Skopal T., Lokoč J., Beecks C.: Ptolemaic access methods: Challenging the reign of the metric space model, in Information Systems, Vol. 38, Num. 7, ISSN: 0306-4379, pp. 989-1006, 2013
  • Kruliš M., Lokoč J., Skopal T.: Efficient Extraction of Feature Signatures Using Multi-GPU Architecture, in Advances in Multimedia Modeling, Huangshan, China, Springer Heidelberg Dordrecht, ISBN: 978-3-642-35727-5, ISSN: 0302-9743, pp. 446-456, 2013
  • Lokoč J., Grošup T., Skopal T.: On Scalable Approximate Search with the Signature Quadratic Form Distance, in 6th International Conference, SISAP 2013, La Coruna, Spain, Springer, ISBN: 978-3-642-41062-8, ISSN: 0302-9743, pp. 312-318, 2013
  • Lokoč J., Navrátil L., Toušek J., Skopal T.: Dynamic Multimedia Exploration Using SIFT Matching, in ICMR '13 Proceedings of the 3rd ACM conference on International conference on multimedia retrieval, Dallas, Texas, USA, ACM, ISBN: 978-1-4503-2033-7, pp. 305-306, 2013

2012

Refereed (journals/proceedings) (10)

  • [IF Journal]Kruliš M., Skopal T., Lokoč J., Beecks C.: Combining CPU and GPU architectures for fast similarity search, in DISTRIBUTED AND PARALLEL DATABASES, Vol. 30, Num. 3-4, ISSN: 0926-8782, pp. 179-207, 2012
  • Lokoč J., Čech P., Novák J., Skopal T.: Cut-region: A Compact Building Block For Hierarchical Metric Indexing, in Lecture Notes in Computer Science, Vol. 2012, Num. 7404, ISSN: 0302-9743, pp. 85-100, 2012
  • Lokoč J., David N., Michal B., Skopal T.: Visual Image Search: Feature Signatures or/and Global Descriptors, in Lecture Notes in Computer Science, Vol. 2012, Num. 7404, ISSN: 0302-9743, pp. 177-191, 2012
  • Lokoč J., Grošup T., Skopal T.: Image Exploration using Online Feature Extraction and Reranking, in ICMR '12 Proceedings of the 2nd ACM International Conference on Multimedia Retrieval, Hongkong, China, ACM, ISBN: 978-1-4503-1329-2, pp. 1-2, 2012
  • Lokoč J., Grošup T., Skopal T.: SIR: The Smart Image Retrieval Engine, in Lecture Notes in Computer Science, Vol. 2012, Num. 7404, ISSN: 0302-9743, pp. 240-241, 2012
  • Lokoč J., Skopal T., Christian B., Thomas S.: Similarity Search by Earth Movers Distance using Nonmetric Ground Distances, in MMEDIA 2012, The Fourth International Conferences on Advances in Multimedia, Chamonix, XPS, ISBN: 978-1-61208-195-3, pp. 50-55, 2012
  • Lokoč J., Wünschmann J., Skopal T., Rothermel A.: Similarity Search in 3D Object-Based Video Data, in CIKM '12 Proceedings of the 21st ACM international conference on Information and knowledge management, Maui, Hawaii, USA, ACM, ISBN: 978-1-4503-1156-4, pp. 2655-2658, 2012
  • Novák J., Hoksza D., Lokoč J., Skopal T.: On Optimizing the Non-metric Similarity Search in Tandem Mass Spectra by Clustering, in Lecture Notes in Computer Science, Vol. 2012, Num. 7292, ISSN: 0302-9743, pp. 189-200, 2012
  • Novák J., Skopal T., Hoksza D., Lokoč J.: Non-metric Similarity Search of Tandem Mass Spectra Including Posttranslational Modifications, in Journal of Discrete Algorithms, Vol. 2012, Num. 13, ISSN: 1570-8667, pp. 19-31, 2012 - On-line verze
  • Skopal T., Lokoč J., Bustos B.: D-cache: Universal Distance Cache for Metric Access Methods, in IEEE Transactions on Knowledge and Data Engineering, Vol. 24, Num. 5, ISSN: 1041-4347, pp. 868-881, 2012

2011

Refereed (journals/proceedings) (7)

  • Beecks C., Lokoč J., Seidl T., Skopal T.: Indexing the Signature Quadratic Form Distance for Efficient Content-Based Multimedia Retrieval, in Proceedings of the 1st ACM International Conference on Multimedia Retrieval, Trento, Italy, ACM, ISBN: 978-1-4503-0336-1, pp. 1-8, 2011
  • [Core A conference]Kruliš M., Lokoč J., Beecks C., Skopal T., Seidl T.: Processing the Signature Quadratic Form Distance on Many-Core GPU Architectures, in Compilation Proceedings of CIKM 2011 and the co-located Workshops, Glasgow, ACM, ISBN: 978-1-4503-0717-8, pp. 2373-2376, 2011
  • Lokoč J., Beecks C., Seidl T., Skopal T.: Parameterized Earth Mover&apos;s Distance for Efficient Metric Space Indexing, in Fourth International Conference on Similarity Search and Applications 2011, Lipari, Italy, ACM, ISBN: 978-1-4503-0795-6, pp. 121-122, 2011
  • Lokoč J., Hetland M., Skopal T., Beecks C.: Ptolemaic Indexing of the Signature Quadratic Form Distance, in Fourth International Conference on Similarity Search and Applications 2011, Lipari, Italy, ACM, ISBN: 978-1-4503-0795-6, pp. 9-16, 2011
  • Moško J., Lokoč J., Skopal T.: Clustered Pivot Tables for I/O-optimized Similarity Search, in Fourth International Conference on Similarity Search and Applications 2011, Lipari, Italy, ACM, ISBN: 978-1-4503-0795-6, pp. 17-24, 2011
  • Novák J., Skopal T., Hoksza D., Lokoč J., Galgonek J.: Protein Sequences Identification using NM-tree, in Fourth International Conference on Similarity Search and Applications 2011, Lipari, Italy, ACM, ISBN: 978-1-4503-0795-6, pp. 125-126, 2011 - On-line verze
  • Skopal T., Bartoš T., Lokoč J.: On (not) indexing quadratic form distance by metric access methods, in Proceedings of the 14th International Conference on Extending Database Technology, Hannover, Germany, ACM, ISBN: 978-1-4503-0528-0, pp. 249-258, 2011

2010

Refereed (journals/proceedings) (3)

  • Lokoč J., Skopal T.: On Applications of Parameterized Hyperplane Partitioning, in Third International Conference on Similarity Search and Applications, Istanbul, Turkey, ACM, ISBN: 978-1-4503-0420-7, pp. 131-132, 2010 - WWW
  • Novák J., Skopal T., Hoksza D., Lokoč J.: Improving the Similarity Search of Tandem Mass Spectra using Metric Access Methods, in Third International Conference on Similarity Search and Applications, Istanbul, Turkey, ACM, ISBN: 978-1-4503-0420-7, pp. 85-92, 2010 - On-line PDF verze
  • Skopal T., Lokoč J.: Answering Metric Skyline Queries by PM-tree, in Proceedings of the Dateso 2010 Annual International Workshop on DAtabases, TExts, Specifications and Objects, Stedronin-Plazy, Czech Republic, MATFYZPRESS, ISBN: 978-80-7378-116-3, ISSN: 1613-0073, pp. 22-37, 2010

2009

Refereed (journals/proceedings) (1)

  • Lokoč J.: Parallel Dynamic Batch Loading in the M-tree, in SISAP 2009: Second international workshop on similarity search and applications, Prague, Czech Republic, IEEE, ISBN: 978-0-7695-3765-8, pp. 117-123, August 2009

Technical reports (1)

  • Skopal T., Lokoč J.: Efficient Metric Skyline Processing using the PM-tree, technical report no. 2009/1, MFF UK, 10 pages, 2009

2008

Refereed (journals/proceedings) (4)

  • Lokoč J.: On M-tree Variants in Metric and Non-metric Spaces, in WDS'08 Proceedings of Contributed Papers: Part I - Mathematics and Computer Sciences , Matfyzpress, ISBN: 978-80-7378-065-4, pp. 230-234, June 2008
  • Lokoč J., Skopal T.: On Reinsertions in M-tree, in 2008 IEEE 24th international conference on data engineering workshop, vols 1 and 2, ISBN: 978-1-4244-2162-6, pp. 570-577, 2008
  • Lokoč J., Skopal T.: On Reinsertions in Mtree, in SISAP 2008: First international workshop on similarity search and applications, Cancun, Mexico, IEEE, ISBN: 0-7695-3101-6, pp. 121-128, April 2008
  • Skopal T., Lokoč J.: NM-tree: Flexible Approximate Similarity Search in Metric and Non-metric Spaces, in 19th International Conference on Database and Expert Systems Applications, ISBN: 978-3-540-85653-5, ISSN: 0302-9743, pp. 312-325, 2008

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