Image retrieval device, image retrieval method, and computer readable medium

An image retrieval method performed by one or more processors configured to:

• acquire a target image and a text for specifying one or more objects in the target image;
• calculate a first feature with reference to the text;
• calculate a second feature for each of the target image and a plurality of reference images with reference to the first feature;
• and
• specify a reference image similar to the target image with reference to a second feature of the target image and a second feature of each of the plurality of reference images, wherein
• in the calculating of the first feature, the first feature is calculated by vectorizing the text in a certain feature space,
• in the calculating of the second feature,
• an image feature of each of the target image and the plurality of reference images is calculated by vectorizing each of the target image and the plurality of reference images in a feature space same as the certain feature space, and
• the second feature for each of the target image and the plurality of reference images is calculated by using similarity between the first feature and the image feature.

A non-transitory computer readable medium having stored therein a program for causing a computer to execute processing of:

• acquiring a target image and a text for specifying one or more objects in the target image;
• calculating a first feature with reference to the text;
• calculating a second feature for each of the target image and a plurality of reference images with reference to the first feature;
• and
• specifying a reference image similar to the target image with reference to a second feature of the target image and a second feature of each of the plurality of reference images, wherein
• in the calculating of the first feature, the first feature is calculated by vectorizing the text in a certain feature space,
• in the calculating of the second feature,
• an image feature of each of the target image and the plurality of reference images is calculated by vectorizing each of the target image and the plurality of reference images in a feature space same as the certain feature space, and
• the second feature for each of the target image and the plurality of reference images is calculated by using similarity between the first feature and the image feature.