An image decoding device for increasing decoding efficiency and reducing the number of memory accesses includes a division unit dividing a picture into first and second coded image data; and first and second decoding units decoding, in parallel, the first and second coded image data and storing decoding results into a frame storage unit. The photodetector generates a current between first and second nodes in response to being illuminated with light. A diverter is in communication with the controller for segregating all the containers produced by a mold of origin determined to have produced the threshold number of containers having the commercial variation beyond the acceptable limits.