In-vehicle monitoring system and in-vehicle monitoring method

An in-vehicle monitoring system that comprises:

• a plurality of monitoring cameras and a plurality of emergency call devices mounted on a vehicle of a train;
• a display unit that displays information transferred within the vehicle;
• and an information control device that transmits imaging data from the monitoring cameras to the display unit, and that monitors inside of the vehicle by using images taken by the monitoring cameras, wherein
• a first table, in which an IP address of one emergency call device is stored in association with two or more multicast addresses and a multicast address associated with an IP address of one emergency call device is also stored in association with another emergency call device, is set in the information control device,
• a second table, in which multicast addresses in the first table are stored in association with IP addresses of the monitoring cameras, respectively, is set in the monitoring camera,
• the monitoring camera transmits imaging data to a multicast address corresponding to an IP address in the second table, and
• upon receiving a call signal from an operated emergency call device, the information control device specifies two or more multicast addresses corresponding to an IP address of an emergency call device as a source of the call signal from a plurality of multicast addresses by referring to the first table and transmits imaging data in a multicast packet transmitted from specified multicast addresses to the display unit.

An in-vehicle monitoring method executed in an in-vehicle monitoring system that comprises a plurality of monitoring cameras and a plurality of emergency call devices mounted on a vehicle of a train and a display unit that displays information transferred within the vehicle, and that monitors inside of the vehicle by using images taken by the monitoring cameras, the method comprising:

• specifying, upon receiving a call signal from an operated emergency call device, IP addresses of two or more monitoring cameras corresponding to an IP address of an emergency call device included in the call signal from IP addresses of the monitoring cameras by referring to a table in which an IP address of a same monitoring camera is stored in association with IP addresses of two or more emergency call devices and an IP address of a same emergency call device is stored in association with IP addresses of two or more monitoring cameras;
• selecting, from pieces of imaging data from the monitoring cameras, imaging data transmitted from monitoring cameras having -IP addresses specified at the specifying;
• and
• transmitting imaging data selected at the selecting to the display unit.

An in-vehicle monitoring method executed in an in-vehicle monitoring system that comprises a plurality of monitoring cameras and a plurality of emergency call devices mounted on a vehicle of a train and a display unit that displays information transferred within the vehicle, and that monitors inside of the vehicle by using images taken by the monitoring cameras, the method comprising:

• transmitting imaging data to a multicast address corresponding to an IP address in a table, in which IP addresses of the monitoring cameras and multicast addresses are stored in association with each other, on a basis of the table;
• specifying, upon receiving a call signal from an operated emergency call device, a multicast address corresponding to an IP address of an emergency call device as a source of the call signal from a plurality of multicast addresses on a basis of a table in which an IP address of one emergency call device is stored in association with two or more multicast addresses and a multicast address associated with an IP address of one emergency call device is stored in association with another emergency call device;
• and
• transmitting imaging data in a multicast packet transmitted from a multicast address-specified at the specifying to the display unit.