beans were misidentified as good beans. The less the bad beans, the better is the quality of the speciality coffee. The measure of interest in this study was the false positive rate (FPR) [20] (4). In this formula, false positive (FP) represents how many bad beans will be predicted as good beans, true negative (TN) represents how many bad beans will be predicted as bad beans. This index indicates the proportion of bad beans misjudged as good beans. The lower the FPR was, the closer we were to the standard of speciality coffee. According to the results of our experiments, the FPR was 0.0441 when the testing data included 7000 images each of good and bad coffee beans.