lucidgrasp

LucidGrasp is a high-performance image search engine that finds visually
similar images across local folders or an entire filesystem. It combines
SSIM structural similarity, ORB keypoint matching, and color histogram
intersection into a single similarity percentage, and can detect edited
copies that have been color graded, contrast adjusted, or filtered.
Indexing and searching run on background threads and stay responsive on
libraries of any size.