RNDr. Jakub Lokoč, Ph.D.

lokoc<at>ksi.mff.cuni.cz
odborný asistent

Výzkumné skupiny

Siret

Oblasti zájmu

  • podobnostní vyhledávání v nestrukturovaných datech
  • metrické a nemetrické indexování
  • vyhledávání na základě obsahu
  • multimediální databáze

Výukanahoru

KódNázevOdkazy
NDBI016Transakce
NDBI025Databázové systémy
NDBI045Vyhledávání a explorace ve videu
NPRG045Ročníkový projekt
NSWI122Příprava disertační práce

Doktorandinahoru

Stávající: Mgr. Přemysl Čech

Vedené prácenahoru

NázevŘešitelTypVypsánoObhájeno
Hledání známého obrázku pomocí automaticky detekovaných klíčových slovTomáš SoučekBc.2018
Hledání známého obrázku pomocí jednoduchých barevných skicPeter DräxlerBc.2018
Aplikace umělých neuronových sítí pro detekci malware v HTTPS komunikaciJan BodnárBc.20172017
Detection of malignant melanoma in histological sample using deep neural networksAdam FreyBc.20172017
(zobrazit všechny)

Výzkumné grantynahoru

  • Efektivní identifikace podgrafů při analýze webových grafů velikosti petabajtů (GAČR 15-08916S) 2015-2017 řešitel
  • Synergické modelování adaptivních podobnostních měr pro potřeby multimediálního vyhledávání (GAČR P202/12/P297) 2012-2014 řešitel
  • Vyhledávání v rozsáhlých multimediálních databázích (GAČR 201/09/0683) 2009-2011 spolupracovník
  • Distributed and Parallel Metric Indexing in Multimedia Databases (GAUK 18208) 2008-2010 řešitel
  • Moderní metody a aplikace softwarového inženýrství (GAUK SVV-2010-261312) 2010-2010 spolupracovník
  • (zobrazit všechny)

Publikační činnostnahoru

2017

Recenzované (časopis, sborník konference) (8)

  • Blažek A., Lokoč J., Kuboň D.: Video Hunter at VBS 2017, in MultiMedia Modeling, Reykjavik, Iceland, Springer, ISBN: 978-3-319-51813-8, ISSN: 0302-9743, pp. 493-498, 2017
  • [Žurnál (bez IF)]Cobarzan C., Schoeffmann K., Bailer W., Hurst W., Blažek A., Lokoč J., Vrochidis S., Barthel K. U., Rossetto L.: Interactive video search tools: a detailed analysis of the video browser showdown 2015, in Multimedia Tools and Applications, Vol. 2017, Num. 76, ISSN: 1380-7501, pp. 5539-5571, 2017
  • Čech P., Maroušek J., Lokoč J., Silva Y. N., Starks J.: Comparing MapReduce-Based k-NN Similarity Joins On Hadoop For High-dimensional Data, in Advanced Data Mining and Applications, Singapore, Springer, ISBN: 978-3-319-69178-7, ISSN: 0302-9743, pp. 63-75, 2017
  • Lokoč J., Grošup T., Čech P., Pevný T., Skopal T.: Malware discovery using behaviour-based exploration of network traffic, in Similarity Search and Applications, Munich, Germany, Springer, ISBN: 978-3-319-68473-4, ISSN: 0302-9743, pp. 315-323, 2017
  • Lokoč J., Kuboň D., Blažek A.: A Comparative Study for Known Item Visual Search Using Position Color Feature Signatures, in MultiMedia Modeling, Reykjavik, Iceland, Springer, ISBN: 978-3-319-51813-8, ISSN: 0302-9743, pp. 3-14, 2017
  • Lokoč J., Phuong A. N., Vomlelová M., Ngo C.: Color-sketch simulator: a guide for color-based visual known-item search, in Advanced Data Mining and Applications, Singapore, Springer, ISBN: 978-3-319-69178-7, ISSN: 0302-9743, pp. 754-763, 2017
  • [Žurnál (bez IF)]Sipiran I., Lokoč J., Bustos B., Skopal T.: Scalable 3D shape retrieval using local features and the signature quadratic form distance, in Visual Computer, Vol. 33, Num. 12, ISSN: 0178-2789, pp. 1571-1585, 2017 - text
  • Skopal T., Peška L., Kovalčík G., Grošup T., Lokoč J.: Product exploration based on latent visual attributes, in Proceedings of the 2017 ACM on Conference on Information and Knowledge Management, Singapore, ACM, ISBN: 978-1-4503-4918-5, pp. 2531-2534, 2017

2016

Recenzované (časopis, sborník konference) (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

Recenzované (časopis, sborník konference) (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
  • [Žurnál s IF]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
  • [Žurnál (bez 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

Recenzované (časopis, sborník konference) (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

Recenzované (časopis, sborník konference) (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

Recenzované (časopis, sborník konference) (10)

  • [Žurnál s IF]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

Recenzované (časopis, sborník konference) (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 konference]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

Recenzované (časopis, sborník konference) (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

Recenzované (časopis, sborník konference) (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

Technické zprávy (1)

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

2008

Recenzované (časopis, sborník konference) (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

Kontaktynahoru

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