PhotoMetrix UVC: A New Smartphone-Based Device for Digital Image Colorimetric Analysis Using PLS Regression
Adilson Ben da Costa, Gilson Augusto Helfer, Jorge Luís Victória Barbosa, Iberê Damé Teixeira, Roberta Oliveira Santos, R. D. dos Santos, Mônica Voss, Sandra Schlessner, Juliano Smanioto Barin
Abstract
A novel free PhotoMetrix UVC is proposed for both the operation of a universal serial bus video camera (UVC) and multivariate image analysis, allowing a full solution for point-of-use analysis. A UVC was placed in an open-source 3D-printed chamber illuminated by a white light-emitting diode (LED) with controlled intensity of light. The digital images captured were converted into red, green, and blue (RGB) histograms, and regression models were used within the app. As a proof-of-concept, four adulterants in raw milk samples were determined. The coefficient of determination (R 2