3rd Place: A Global and Local Dual Retrieval Solution to Facebook AI Image Similarity Challenge
This work addresses image similarity retrieval for computer vision applications, but it is incremental as it builds on existing descriptor techniques.
The paper tackled the challenge of large-scale image similarity retrieval under copy attacks by proposing a multi-branch method combining global and local descriptors, achieving 3rd place in the Facebook AI Image Similarity Challenge 2021.
As a basic task of computer vision, image similarity retrieval is facing the challenge of large-scale data and image copy attacks. This paper presents our 3rd place solution to the matching track of Image Similarity Challenge (ISC) 2021 organized by Facebook AI. We propose a multi-branch retrieval method of combining global descriptors and local descriptors to cover all attack cases. Specifically, we attempt many strategies to optimize global descriptors, including abundant data augmentations, self-supervised learning with a single Transformer model, overlay detection preprocessing. Moreover, we introduce the robust SIFT feature and GPU Faiss for local retrieval which makes up for the shortcomings of the global retrieval. Finally, KNN-matching algorithm is used to judge the match and merge scores. We show some ablation experiments of our method, which reveals the complementary advantages of global and local features.