System, method, and storage medium

A method performed by a system including a point of sale (POS) terminal, a monitoring device, a management terminal for monitoring the POS terminal, and an imaging device, the method comprising:

• acquiring, by the monitoring device, images of an imaging area including the POS terminal captured by the imaging device;
• determining, by the monitoring device, whether a purchaser and an article not initially present in the imaging area are detected in the imaging area based on the images acquired from the imaging device;
• determining, by the monitoring device, that a departure without payment by the purchaser has been detected when the purchaser previously detected in the imaging area ceases to be detected during a checkout process started by the purchaser at the POS terminal and the article is not detected in the imaging area, the checkout process including registration of items to be purchased by the purchaser;
• transmitting, by the monitoring device, a notification signal indicating the detection of the departure without payment to the management terminal;
• and
• outputting, by the monitoring device, an operation disabling signal to the POS terminal to disable operation of the POS terminal when the purchaser previously detected in the imaging area ceases to be detected during the checkout process and the article is detected in the imaging area, wherein
• the operation disabling signal is stopped when the purchaser is detected again in the imaging area during the checkout process.

A non-transitory computer readable storage medium storing a program for causing a processor of a monitoring device to perform a process including:

• acquiring images of an imaging area including a point of sale (POS) terminal captured by an imaging device;
• determining whether a purchaser and an article not initially present in the imaging area are detected in the imaging area based on the images acquired from the imaging device;
• determining that a departure without payment by the purchaser has been detected when the purchaser previously detected in the imaging area ceases to be detected during a checkout process started by the purchaser at the POS terminal and the article is not detected in the imaging area, the checkout process including registration of items to be purchased by the purchaser;
• transmitting a notification signal indicating the detection of the departure without payment to a management terminal that controls the POS terminal;
• and
• outputting an operation disabling signal to the POS terminal to disable operation of the POS terminal when the purchaser previously detected in the imaging area ceases to be detected during the checkout process and the article is detected in the imaging area, wherein
• the operation disabling signal is stopped when the purchaser is detected again in the imaging area during the checkout process.