Person tracking system, person tracking method, and storage medium

A person tracking method comprising:

• performing processing for detecting a first person from an image, and calculating a first feature vector representing a feature of the detected first person;
• acquiring a hash value corresponding to a key generated based on information relating to the first feature vector, and storing feature data including the first feature vector and the key in a storage area of an external device determined based on the acquired hash value;
• determining whether or not the first person represented by the first feature vector included in the feature data read from the external device and a second person registered in advance are a same person;
• and
• tracking the first person as a tracking target, when it is determined that the first person and the second person are the same person.

A non-transitory computer-readable recording medium recording a program, the program causing a computer to execute:

• performing processing for detecting a first person from an image, and calculating a first feature vector representing a feature of the detected first person;
• acquiring a hash value corresponding to a key generated based on information relating to the first feature vector, and storing feature data including the first feature vector and the key in a storage area of an external device determined based on the acquired hash value;
• determining whether or not the first person represented by the first feature vector included in the feature data read from the external device and a second person registered in advance are a same person;
• and
• tracking the first person as a tracking target, when it is determined that the first person and the second person are the same person.