點擴散函數（英語：point spread function，簡稱PSF）是描述光學系統對點源解析能力的函數。因為點源在經過任何光學系統後都會由於衍射而形成一個擴大的像點，通過測量系統的點擴展函數，能夠更準確地提取圖像信息。
參考資料
- Rachel Noek*, Caleb Knoernschild*, Justin Migacz*, Taehyun Kim*, Peter Maunz*, True Merrill, Harley Hayden, C.S. Pai, and Jungsang Kim*. Multi-scale Optics for Enhanced Light Collection from a Point Source (PDF). Optics Letters (Duke University). [2010-11-28]. arXiv:1006.2188
. （原始內容存檔 (PDF)於2020-10-28）.
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