# Edge enhancement by negative Poincare–Hopf index filters

> Research article (Optics Letters, 2018) · cited 36× · AI/ML

**Wikidata**: [openalex:W2798248148](https://www.wikidata.org/wiki/openalex:W2798248148)  
**Source**: https://4ort.xyz/entity/edge-enhancement-by-negative-poincarehopf-index-filters