See the BBC article on the front of their Science section, or the front-page of UCL's site.
Some behind-the-scenes context:
The real machine learning R&D was done by Daniyar Turmukhambetov, Oisin Mac Aodha, and Michael Firman. All are current/recent postdocs from our group. Most started as MSc students here!
Sarah Gallacher is the linchpin of the project. Not surprising, as she started with a background in software engineering and machine learning, and then got into HCI.
There are many other people involved, and you should read about them and see the project landing page: https://naturesmartcities.com/.
I'll just add that Libby Kinsey did her MSc a few years ago in our group, working with Oisin and Kate Jones, to get the initial bat-call detector working on full-size computers. So what you're seeing running in the Olympic Park is the result of these people's hard work to build ML models, herd volunteers, gather data, build hardware, shrink ML models, waterproof prototypes, etc. That's several people's very hard work over a sustained period of time! Thanks to EPSRC EP/K015664/1 and EP/K503745/1 for co-funding this work.
Collecting some of the press coverage here: http://www.ucl.ac.uk/news/headlines/0617/290617-shazam-for-bats

To see the bats ping'ing, check out the live map (best at night): http://batslondon.com.

Come to the conference in September!
We had a record number of submissions, as this is a top venue for publishing new work in Computer Vision and Machine Learning.

Submit your great papers, so they can appear in the top-ranked journal in all of Computer Science!

C Ilisescu, H. A. Kanaci, M. Romagnoli, N. Campbell, G.J. Brostow, "Responsive Action-Based Video Synthesis," 2017, conditionally accepted to SIGCHI - Project Page - BibTex - PDF
T. Intharah, D. Turmukhambetov, G.J. Brostow, (HILC) "Help, It Looks Confusing: GUI Task Automation Through Demonstration and Follow-up Questions," in ACM Intelligent User Interfaces (IUI) 2017 - Project Page - BibTex - PDF
C. Godard, O. Mac Aodha, G.J. Brostow, "Unsupervised Monocular Depth Estimation with Left-Right Consistency," 2016, on arXiv for now. - Project Page - PDF
P. Hedman, T. Ritschel, G. Drettakis, G.J. Brostow, "Scalable Inside-Out Image-Based Rendering," conditionally accepted to SIGGRAPH ASIA 2016 - Project Page - BibTex - PDF
D. E. Worrall, C. Wilson, G. Brostow, "Automated Retinopathy of Prematurity Case Detection with Convolutional Neural Networks," in Deep Learning in Medical Image Analysis 2016 - Project Page - BibTex - PDF
W. Li, F. Viola, J. Starck, G.J. Brostow, N.D.F. Campbell, "Roto++: Accelerating Professional Rotoscoping Using Shape Manifolds," SIGGRAPH 2016 - Project Page - BibTex - PDF
M. Firman, O. Mac Aodha, S. Julier, G.J. Brostow, "Structured Prediction of Unobserved Voxels From a Single Depth Image," CVPR 2016 - Project Page - BibTex - PDF
D. Worrall, G.J. Brostow, C. Wilson, "Automated Optic Disk Localization in The Neonatal Fundus Image," ARVO 2016 - Project Page - BibTex - PDF
T. Haines, O. Mac Aodha, G.J. Brostow, "My Text in Your Handwriting," Transactions on Graphics (ToG), to be presented at SIGGRAPH 2016 - Project Page - BibTex - PDF
C. Godard, P. Hedman, W. Li, G.J. Brostow, "Multi-view Reconstruction of Highly Specular Surfaces in Uncontrolled Environments," 3DV 2015 - Project Page - Code - BibTex - PDF
A. Monszpart, N. Mellado, G.J. Brostow, N.J. Mitra, "Rebuilding Scans of Man-made Scenes with Regular Arrangements of Planes," SIGGRAPH 2015 / Transactions on Graphics (ToG). - Project Page - BibTex - PDF
E. Johns, O. Mac Aodha, G.J. Brostow, "Becoming the Expert - Interactive Multi-Class Machine Teaching," CVPR 2015 - Project Page - Video Presentation - BibTex - PDF
M. Gryka, M. Terry, G.J. Brostow, "Learning to Remove Soft Shadows," Transactions on Graphics (ToG), presented at SIGGRAPH 2015 - Project Page - PDF - BibTex
D. Waithe, P. Rennert, G.J. Brostow, M.D.W. Piper, "QuantiFly: Robust Trainable Software for Automated Drosophila Egg Counting," PLoS ONE, 2015 - Project Page - Code - BibTex
O. Mac Aodha, N.D.F. Campbell, J. Kautz, G.J. Brostow, "Hierarchical Subquery Evaluation for Active Learning on a Graph," CVPR 2014 - Project Page - Talk Video - BibTex - PDF
Hugo Lopez-Tovar, G.J. Brostow, "Learning Sketch-based 3D Modelling From A User's Sketching Gestures," Sketch: Pen and Touch Recognition, IUI Workshop 2014 - PDF - BibTex
O. Mac Aodha, V. Stathopoulos, M. Terry, K.E. Jones, G. J. Brostow, M. Girolami, "Putting the Scientist in the Loop - Accelerating Scientific Progress with Interactive Machine Learning," Invited paper in ICPR 2014 - Project Page - PDF - BibTex
O. Mac Aodha, G.J. Brostow, "Revisiting Example Dependent Cost-Sensitive Learning with Decision Trees," ICCV 2013 - Project Page - BibTex - PDF
O. Mac Aodha, A. Humayun, M. Pollefeys, G.J. Brostow, "Learning a Confidence Measure for Optical Flow," in IEEE PAMI 2012 - Project Page - BibTex - PDF
C. Garc? Cifuentes, M. Sturzel, F. Jurie  G.J. Brostow, "Motion Models That Only Work Sometimes," BMVC 2012 - Project Page - BibTex - PDF	(Ksummit17's input video http://youtu.be/ygEFhh1MPOE)
O. Mac Aodha, N.D.F. Campbell, A. Nair, G.J. Brostow, "Patch Based Synthesis for Single Depth Image Super-Resolution," ECCV 2012 - Project Page - BibTex - PDF
A. Humayun, O. Mac Aodha, G.J. Brostow, "Learning to Find Occlusion Regions," CVPR 2011 - Project Page - BibTex - PDF
M. Reynolds, J. Dobo?, L. Peel, T. Weyrich, G.J. Brostow, "Capturing Time-of-Flight Data with Confidence," CVPR 2011 - Project Page - BibTex - PDF
G.J. Brostow, C. Hern?dez, G. Vogiatzis, B. Stenger, R. Cipolla, "Video Normals from Colored Lights," IEEE PAMI 2011 - PDF - Project Page (does not include PDF though) - Bibtex
A. Taneja, L. Ballan, J. Puwein, G.J. Brostow, M.Pollefeys, "3D Reconstruction and Video-Based Rendering of Casually Captured Videos," chapter in Video Processing and Computational Video, Springer 2011 - Book - BibTex
L. Ballan, G. J. Brostow, J. Puwein, M. Pollefeys, "Unstructured Video-Based Rendering: Interactive Exploration of Casually Captured Videos," ACM  Transactions on Graphics (Proc. SIGGRAPH) 2010 - Project Page - BibTex - further efforts
O. Mac Aodha, G.J. Brostow, M. Pollefeys, "Segmenting Video Into Classes of Algorithm-Suitability," CVPR 2010 - Project Page - BibTex
C. Amati, G.J. Brostow, "Modeling 2.5D Plants from Ink Paintings," in Proc. ACM SIGGRAPH/Eurographics Symposium on SBIM (Sketch-Based Interfaces and Modeling), p41-48, 2010 - PDF - BibTex
G.J. Brostow, J. Fauqueur, R. Cipolla, "Semantic object classes in video: A high-definition ground truth database," Pattern Recognition Letters 30(2): 88-97, 2009 - PDF - CamVid Project Page - Data (The raw video files are mirrored here) - BibTex
G.J. Brostow, J. Shotton, J. Fauqueur, R. Cipolla, "Segmentation and Recognition using Structure from Motion Point Clouds", ECCV (1): 44-57, 2008 - New project page with original data (CamVid) - Original Project Page (with some broken links) - Raw video files are mirrored here - BibTex
C. Hern?dez, G. Vogiatzis, G.J. Brostow, B. Stenger, R. Cipolla, "Non-Rigid Photometric Stereo with Colored Lights," ICCV 2007 - Project Page - BibTex
J. Fauqueur, G. Brostow, R. Cipolla, "Assisted Video Object Labeling By Joint Tracking of Regions and Keypoints," In Proc. IEEE ICCV 2007 Interactive Computer Vision Workshop, p1-7, 2007 - PDF - BibTex
G. J. Brostow, R. Cipolla, "Unsupervised Bayesian Detection of Independent Motion in Crowds," In Proc. IEEE CVPR, Vol I: 594-601, June 2006. - PDF - BibTex - Project Page
M. Johnson, G.J. Brostow, J. Shotton, O. Arandjelovic, V. Kwatra, R. Cipolla, "Semantic Photo Synthesis," Computer Graphics Forum (Proc. Eurographics) Volume 25, #3, p407-413, 2006. - PDF - BibTex - Project Page
A.R. Shen, G.J. Brostow, R. Cipolla, "Toward Automatic Bloodspatter Analysis in Crime Scenes," In Proceedings IET Crime and Security Conference (Imaging for Crime Detection and Prevention), p378-383, 2006. - PDF - BibTex - Project Page
M. Wilczkowiak, G.J. Brostow, B. Tordoff, R. Cipolla, "Hole Filling Through Photomontage," p492-501 in BMVC 2005. - PDF (1.8Mb) - BibTex - Project Page
M. Terry, G.J. Brostow, G. Ou, J. Tyman, D. Gromala, "Making Space for Time in Time-Lapse Photography," In SIGGRAPH Technical Sketches, 2004. - PDF (2.5Mb) - BibTex - Project Page
G.J. Brostow, I. Essa, D. Steedly, V. Kwatra, "Novel Skeletal Representation For Articulated Creatures," In Proceedings of ECCV, May 2004, Vol III: 66-78. Official version ? Springer-Verlag   - ECCV 2004.pdf  (5Mb)    - BibTex   G.J. Brostow, "Novel Skeletal Representation For Articulated Creatures," Ph.D. Thesis, Georgia Institute of Technology, 2004.   - PDF (21Mb)     - BibTex - Project Page
K.E. Sukel, R. Catrambone, I.A. Essa, G.J. Brostow, "Presenting Movement in a Computer-Based Dance Tutor," In International Journal of Human-Computer Interaction, 15(3), 2003   - PDF - BibTex
G.J. Brostow and I.A. Essa, "Image-Based Motion Blur for Stop Motion Animation," In Computer Graphics, Proceedings of SIGGRAPH 2001. - Project Page - BibTex
I.A. Essa and G.J. Brostow, "A Course on Digital Video Special Effects," in Proceedings of the IEEE CS Workshop on Undergraduate Education & Image Computation, Hilton Head, South Carolina, June, 2000. - PDF version - DVFX Home Page - BibTex
J. O' Brien, B. Bodenheimer, G.J. Brostow, J. Hodgins, "Automatic Joint Parameter Estimation From Magnetic Motion Capture Data," Graphics Interface 2000, Montreal, Canada. - Abstract - PDF version - BibTex
G.J. Brostow and I.A. Essa, "Motion Based Decompositing of Video," in Proceedings of ICCV, International Conference on Computer Vision 1999, Corfu, Greece, September 1999. - PDF version - Project Home Page - BibTex