{"url":"/method/alignps","slug":"alignps","name":"AlignPS","full_name":"Feature-Aligned Person Search Network","full_name_withheld":false,"description_markdown":"**AlignPS**, or **Feature-Aligned Person Search Network**, is an anchor-free framework for efficient person search. The model employs the typical architecture of an anchor-free detection model (i.e., [FCOS](https://paperswithcode.com/method/fcos)). An aligned feature aggregation (AFA) module is designed to make the model focus more on the re-id subtask. Specifically, AFA reshapes some building blocks of [FPN](https://paperswithcode.com/method/fpn) to overcome the issues of region and scale misalignment in re-id feature learning. A [deformable convolution](https://paperswithcode.com/method/deformable-convolution) is exploited to make the re-id embeddings adaptively aligned with the foreground regions. A feature fusion scheme is designed to better aggregate features from different FPN levels, which makes the re-id features more robust to scale variations. The training procedures of re-id and detection are also optimized to place more emphasis on generating robust re-id embeddings.","description_state":"present","introduced_year":null,"introduced_by":{"title":"Efficient Person Search: An Anchor-Free Approach","paper":"/paper/efficient-person-search-an-anchor-free","first_author":"Yichao Yan","n_authors":5,"url_abs":null,"archive_paper_url":"https://paperswithcode.com/paper/efficient-person-search-an-anchor-free"},"source":{"url":"https://arxiv.org/abs/2109.00211v1","title":"Efficient Person Search: An Anchor-Free Approach","url_on_a_paper_host":true},"code_snippet_url":null,"code_snippet_url_on_a_code_host":false,"categories":[{"area":"Computer Vision","area_id":"computer-vision","collection":"Person Search Models","url":"/methods/category/person-search-models","pwc_aliases":[]}],"n_papers_tagged":2,"archive_num_papers":2,"papers_newest_first":[{"paper":null,"title":"Head and Body: Unified Detector and Graph Network for Person Search in Media","date":"2021-11-27","arxiv_id":"2111.13888","n_code_links":0,"syntology":null},{"paper":"/paper/efficient-person-search-an-anchor-free","title":"Efficient Person Search: An Anchor-Free Approach","date":"2021-09-01","arxiv_id":"2109.00211","n_code_links":4,"syntology":null}],"papers_shown":2,"tasks":[{"task":"/task/person-search","name":"Person Search","papers":2}],"tasks_shown":1,"n_tasks":1,"usage_by_year":[{"year":"2021","papers":2}],"row_source":"methods_table","archive":{"source":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","archive_url":"https://paperswithcode.com/method/alignps"},"syntology_read_at":"2026-09-24T18:15:14+00:00"}