Patent ID: 7298870

Claim:
A granule color sorting apparatus equipped with a display control device, comprising: a transferring means for transferring granules consecutively; an illuminating means for illuminating the transferred granules at a detection position; an image pickup means for picking up images of the illuminated granules at the detection position; a contour processing means for outputting the contour of the granule in the form of contour binary data based on a comparison of an image signal of the image pickup means with a contour threshold; a defective determination means for determining the granule having a part exceeding a threshold that corresponds to a predetermined density as a defective granule and outputting the defective part of the defective granule in the form of defective pixel binary data; a granule display means for combining the defective pixel binary data output from the defective determination means into the contour binary data output from the contour processing means and displaying the combined data; a defective display means for displaying the defective pixel binary data output from the defective determination means; and a threshold adjustment means for altering a threshold while observing the respective display means.