Feature amount acquisition device, similar image search device, display device, feature amount acquisition method, similar image search method, display method, and program

Abstract

A feature amount acquisition device () includes an activation level calculator () deriving, as an activation level, a level at which, in a CNN classifier () including a plurality of layers and configured to, by processing input data based on image data of an input image capturing a first target and a second target around the first target in the layers, output a classification result of the first target, an unit in a layer among the layers influences a classification result and a feature amount acquirer () acquiring, based on the derived activation level and the image data of the input image, a feature amount of the input image so that a feature amount of a low activation level image region that is a region in the input image corresponding to a second unit having a lower activation level than a first unit is smaller than a feature amount of a high activation level image region that is a region in the input image corresponding to the first unit.