Comparison between Hyperspectral Imaging and Chemical Analysis of Polyphenol Oxidase Activity on Fresh-Cut Apple Slices

Figure 4

(a) RMSE PRESS plot for PPO as a function of the number of factors. (b) Method comparison-regression analysis: regression analysis: PPO predicted by PLS vs. PPO measured by the gold standard method. The dashed grey line: a line of equality, solid red line: result of the Deming regression with the obtained fit ratio, and solid blue line: a line of Passing–Bablok regression.

(a)

(b)