Image extraction device, image extraction system, image extraction method, and image extraction program

An image extraction system including an image extraction device and a user terminal, wherein

• the user terminal has an imaging unit for taking a pathological image, and
• the image extraction device has:
• an acquisition unit which acquires the pathological image;
• a first calculation unit which calculates a local feature amount of the pathological image;
• a second calculation unit which calculates a non-local feature amount by performing calculation processing to reduce a dimension of a correlation matrix of the local feature amount;
• a third calculation unit which calculates a degree of similarity between the non-local feature amount and a feature amount of each of a plurality of reference images stored in a database;
• and
• an extraction unit which extracts one or more reference images based on the degree of similarity.

An image extraction method comprising:

• acquiring a pathological image;
• calculating a local feature amount of the pathological image;
• calculating a non-local feature amount by performing calculation processing to reduce a dimension of a correlation matrix of the local feature amount;
• calculating a degree of similarity between the non-local feature amount and a feature amount of each of a plurality of reference images stored in a database;
• and
• extracting one or more reference images based on the degree of similarity.

A non-transitory computer readable medium storing an image extraction program causing an arithmetic unit included in an image extraction device to function as:

• an acquisition unit which acquires a pathological image;
• a first calculation unit which calculates a local feature amount of the pathological image;
• a second calculation unit which calculates a non-local feature amount by performing calculation processing to reduce a dimension of a correlation matrix of the local feature amount;
• a third calculation unit which calculates a degree of similarity between the non-local feature amount and a feature amount of each of a plurality of reference images stored in a database;
• and
• an extraction unit which extracts one or more reference images based on the degree of similarity.