Image retrieval system, image retrieval method, and storage medium

An image retrieval method comprising:

• acquiring a retrieval image including a region of interest;
• extracting a feature from a region other than the region of interest of the retrieval image;
• retrieving, from a plurality of registered images obtained by capturing a plurality of objects to be registered, a registered image having a feature that matches the extracted feature;
• and
• outputting some or all of the retrieved registered images in a mode that a region corresponding to the region of interest in the retrieval image is recognizable.

A non-transitory storage medium storing a program for causing a computer to function as:

• an acquisition means configured to acquire a retrieval image including a region of interest;
• an extraction means configured to extract a feature from a region other than the region of interest of the retrieval image;
• a retrieval means configured to retrieve, from a plurality of registered images obtained by capturing a plurality of objects to be registered and stored in a storage means, a registered image having a feature that matches the feature extracted by the extraction means;
• and
• an output means configured to output some or all of the registered images retrieved by the retrieval means in a mode that a region corresponding to the region of interest in the retrieval image is recognizable.