3.2.3Grayscale ScannerPictureGrayscale Scanner will help system to check the carrier loading situation and book carriers for Induction. The function will be:-Before induction area, a Grayscale Scanner will be set.-Before Induction infeed parcels to the main loop, Grayscale Scanner will take picture of each carrier moving through to figure out which carrier is loading parcel and which is empty. -Then Induction will infeed the parcel to the empty carrier according to the information of Grayscale Scanner. -Grayscale Scanner will also help system to figure out which carrier carry parcel however it should be empty. So, this abnormal parcel will be sent to reject chute.