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<p class="MsoNormal">[Apologies for cross-posting]<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear colleagues,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are pleased to announce the <b>ChaLearn UDIVA-HHOI Challenge @ ECCV 2026</b>, organized within the
<b>CONTEXTUS Workshop</b> at the European Conference on Computer Vision (ECCV 2026).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The challenge focuses on advancing research in context-aware human behavior understanding, emphasizing how people interact, coordinate, and influence one another in real-world settings. Going beyond isolated action recognition, the challenge
promotes socially grounded and multimodal visual intelligence.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Participants will work with the new <b>UDIVA-HHOI dataset</b>, a multimodal, multi-view dataset of non-scripted dyadic interactions in a collaborative assembly task. The dataset includes synchronized audio, video, transcripts, and rich
contextual metadata from one exocentric and two egocentric views, capturing behaviors such as collaboration, joint attention, and leader-follower dynamics. Annotated sessions include both verbal and non-verbal human-human-object interaction events, together
with goals, intentions, and causal relationships.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The challenge features 5 tracks:<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l1 level1 lfo1">Track 1: Multimodal Exocentric Event Recognition<o:p></o:p></li><li class="MsoNormal" style="mso-list:l1 level1 lfo1">Track 2: Multimodal Egocentric Event Recognition<o:p></o:p></li><li class="MsoNormal" style="mso-list:l1 level1 lfo1">Track 3: Multimodal Exocentric Event Anticipation<o:p></o:p></li><li class="MsoNormal" style="mso-list:l1 level1 lfo1">Track 4: Multimodal Egocentric Event Anticipation<o:p></o:p></li><li class="MsoNormal" style="mso-list:l1 level1 lfo1">Track 5: Multimodal Exocentric Causal Event Grounding<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Registration is now open! For schedule and more information please visit:<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l0 level1 lfo2">Challenge website: https://lap.chalearn.eu/public/udiva-hhoi-challenge-eccv26<o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level1 lfo2">Workshop website: https://lap.chalearn.eu/public/ECCV26-CONTEXTUS (Call for papers and invited speakers coming soon.)<o:p></o:p></li></ul>
<p class="MsoNormal" style="margin-left:18.0pt"><o:p> </o:p></p>
<p class="MsoNormal">Top-ranked teams will receive monetary awards and certificates, along with the opportunity to publish and present their work at the workshop. Travel and registration grants may also be available subject to funding.<o:p></o:p></p>
<p class="MsoNormal">Supported by ChaLearn, SurfingTech, and Google.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Organizers: <o:p></o:p></p>
<p class="MsoNormal">Cristina Palmero (King’s College London)<o:p></o:p></p>
<p class="MsoNormal"><span lang="ES">Sergio Escalera (Universitat de Barcelona & Computer Vision Center)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES">Albert Clapés (Universitat de Barcelona)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES">Xavier Baró (Universitat de Barcelona)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES">Daniele Berardini (Instituto Italiano di Tecnologia)<o:p></o:p></span></p>
<p class="MsoNormal">Hugo Jair Escalante (The University of Texas at El Paso & INAOE)<o:p></o:p></p>
<p class="MsoNormal"><span lang="ES">Vittorio Murino (Instituto Italiano di Tecnologia & University of Verona)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="ES"><o:p> </o:p></span></p>
<p class="MsoNormal">Challenge chairs: Jeanfed Ramírez Lima, Luis J. Arellano<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Advisory board: Isabelle Guyon, Jeffrey Cohn<o:p></o:p></p>
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