# Ring Difference Filter for Fast and Noise Robust Depth From Focus

> Research article (IEEE Transactions on Image Processing, 2019) · cited 47× · AI/ML

**Wikidata**: [openalex:W2971019507](https://www.wikidata.org/wiki/openalex:W2971019507)  
**Source**: https://4ort.xyz/entity/ring-difference-filter-for-fast-and-noise-robust-depth-from-focus