spectra (both SNV-transformed). The potato is represented by the spectra with a clear peak around 970 nm. NIR spectra after removal of the conveyor belt-spectra can be seen in Fig. 2b. All spectra extracted from one potato tuber were averaged and used for PLS regression. A regression model based on the on-line measurements gave good prediction performance (R2¼0.92, RMSECV¼1.06, 6 PLS factors)