# Image-based food portion size estimation using a smartphone without a fiducial marker

> Research article (Public Health Nutrition, 2018) · cited 38× · AI/ML

**Wikidata**: [openalex:W2989440892](https://www.wikidata.org/wiki/openalex:W2989440892)  
**Source**: https://4ort.xyz/entity/image-based-food-portion-size-estimation-using-a-smartphone-without-a-fiducial-marker