Point-of-sale terminal, method, and medium

A method performed by a point-of-sale (POS) terminal, the method comprising:

• storing, in a memory, feature data representing a feature of an image of each of items that are sold in a store, the feature data being associated with an item code of said each of items;
• controlling an imaging device to capture an image;
• performing a code reading process on the image to read an item code of an item shown in the image;
• performing feature extraction on the image to acquire first feature data representing a feature of the item shown in the image;
• searching the memory for second feature data that is associated with the read item code;
• based on a difference between the first and second feature data, determining whether a package of the item was changed since the second feature data was stored in the memory;
• upon determining that the package of the item was not changed, registering the item for purchase;
• and
• upon determining that the package of the item was changed, issuing a notification.

A non-transitory computer readable medium storing a program causing a computer to execute a method comprising:

• storing, in a memory, feature data representing a feature of an image of each of items that are sold in a store, the feature data being associated with an item code of said each of items;
• controlling an imaging device to capture an image;
• performing a code reading process on the image to read an item code of an item shown in the image;
• performing feature extraction on the image to acquire first feature data representing a feature of the item shown in the image;
• searching the memory for second feature data that is associated with the read item code;
• based on a difference between the first and second feature data, determining whether a package of the item was changed since the second feature data was stored in the memory;
• upon determining that the package of the item was not changed, registering the item for purchase;
• and
• upon determining that the package of the item was changed, issuing a notification.