Application of laser beams to apple firmness measurement'

摘要

A laser beam was used as a light source to evaluate firmness of apples nondestructively. Two different varieties of apples were illuminated with laser beams with three different wavelengths at three output power levels. Five features of interest were derived from laser images to estimate the fruit firmness using multiple regression analysis. The actual firmness was measured by an Instron Universal Tester. A multivariate discrimination analysis technique was used to classify apples into various firmness stages.