communicate these occurrences to the main database. A hood was positioned immediately before the load cells at the start of the grader. The hood lit the grader with fluorescent light, and shielded it from other light sources. A video camera located in the hood provided images to Imbada processing software. In-feed mixing was determined by inserting blocks of 100 markers into the bin dump between consecutive apple bins. Marker arrival at the grader was recorded on a time basis, and markers were then positioned within the fruit sequence based on the cup-stream data.