Abstract: A passing determination device acquires a first captured image obtained by repeatedly capturing an image of a region including a passing determination position of a trailer from a front of the trailer in a traveling direction of the trailer, and detects the trailer from the first captured image. Further, the passing determination device includes a processor configured to determine that the trailer detected from the first captured image captured at a first time passes through the passing determination position when the trailer is detected from the first captured image captured at the first time and the trailer is not detected from the first captured image captured within a first time period from the first time.

Abstract: A character recognition device includes a recognizer that recognizes at least one character string from a plurality of character strings in an image including a trailer captured by an imaging device, and a selector. The selectors selects one of the at least one character string as the trailer ID/container ID based on the at least one character string having a similarity to a master data of a previously held trailer ID/container ID equal to or larger than a predetermined threshold value.

Abstract: A character recognition device includes a recognizer that recognizes at least one character string from an image including a trailer captured by an imaging device, and a selector. The selector selects character strings conforming to a specified notation format among the character strings recognized by the recognizer as candidates of a trailer ID/container ID, and that selects one of the candidates of the trailer ID/container ID, which has a similarity to master data of a previously held trailer ID/container ID equal to or larger than a predetermined threshold value as the trailer ID/container ID.