# Lossless robust image watermarking by using polar harmonic transform

> Research article (Signal Processing, 2020) · cited 45× · AI/ML

**Wikidata**: [openalex:W3092514202](https://www.wikidata.org/wiki/openalex:W3092514202)  
**Source**: https://4ort.xyz/entity/lossless-robust-image-watermarking-by-using-polar-harmonic-transform