# Robust Color Image Watermarking Using Geometric Invariant Quaternion Polar Harmonic Transform

> Research article (ACM Transactions on Multimedia Computing Communications and Applications, 2015) · cited 51× · AI/ML

**Wikidata**: [openalex:W2072142347](https://www.wikidata.org/wiki/openalex:W2072142347)  
**Source**: https://4ort.xyz/entity/robust-color-image-watermarking-using-geometric-invariant-quaternion-polar-harmonic-transform