Summary
In China, grading of dried raisins is currently carried out by visual and manual sorting at packing houses. Therefore, an uniform graded shipment is still a serious problem because of differences in the evaluatorls judgment and an indefinite definition of external qualities.HomePage
In this study, the external appearance such as shape and external skin color information of dried green raisins produced in China were measured using a general purpose machine vision system. Based on these measurements, the fundamental findings for development of a grading machine were obtained. Furthermore, the feasibility of grading using a color image sensor was evaluated. As a result, it was clear that dried green raisins could be sorted into three grades: excellent, fair and substandard at about a 91% comprehensive discrimination by appropriately setting a threshold value at the characteristic external skin color.Keywords : external skin color discrimination, color image sensor, threshold value, Chinese dried green raisin , general purpose machine vision system