1 Image Retrieval in the Wild CVPR 2020 Tutorial on Yusuke Matsui The University of Tokyo Takuma Yamaguchi Mercari Inc. Zheng Wang National Institute of Informatics

2 Yusuke Matsui ✓ Image retrieval ✓ Large-scale indexing http://yusukematsui.me “Reconfigurable Inverted Indexing”, ACMMM 18 “A Survey of Product Quantization”, ITE 18 Lecturer (Assistant Professor), the University of Tokyo, Japan @utokyo_bunny

3 Takuma Yamaguchi Engineering Manager, Mercari, Inc. https://www.linkedin.com/in/kumon-takuma-yamaguchi/ • OCR • Image Restoration • Super Resolution • Distributed File/Computing System • Image Recognition System • Visual Search System

4 Zheng Wang ✓ Person Re-identification ✓ Instance Search https://wangzwhu.github.io/home/ “Learning to Reduce Dual-level Discrepancy for Infrared-Visible Person Re-identification”, CVPR 19 “Beyond Intra-modality: A Survey of Heterogeneous Person Re-identification”, IJCAI 20 JSPS Fellowship Researcher, National Institute of Informatics, Japan

5 Image retrieval ➢ Significant progress has been made in the last decade ➢ However, evaluation is based on existing datasets ➢ No enough discussion about how to create a practical and large- scale visual search system Paris dataset: https://www.robots.ox.ac.uk/~vgg/data/parisbuildings/

6 Practical and large-scale visual search system for real-world applications ✓ Discovering visually similar items in online marketplace apps ✓ Re-identification for pedestrians in a security scenario.

7 Schedule ◆08:30 – 09:15 (Seattle) / 17:30 – 18:15 (Paris) / 24:30 – 25:15 (Tokyo) Billion-scale Approximate Nearest Neighbor Search - Yusuke Matsui ◆09:15 – 10:00 (Seattle) / 18:15 – 19:00 (Paris) / 25:15 – 26:00 (Tokyo) A Large-scale Visual Search System in the C2C Marketplace App Mercari - Takuma Yamaguchi ◆10:00 – 10:30 (Seattle) / 19:00 – 19:30 (Paris) / 26:00 – 26:30 (Tokyo) Coffee Break ◆10:30 – 11:15 (Seattle) / 19:30 – 20:15 (Paris) / 26:30 – 27:15 (Tokyo) Beyond Intra-modality Discrepancy: A Survey of Heterogeneous Person Re-identification - Zheng Wang ◆11:15 – 12:00 (Seattle) / 20:15 – 21:00 (Paris) / 27:15 – 28:00 (Tokyo) Live-coding Demo to Implement an Image Search Engine from Scratch - Yusuke Matsui