1. An information processing device, comprising: a central processing unit (CPU) configured to: analyze pattern-irradiated images captured by at least one camera from a plurality of different viewpoints, wherein each of the pattern-irradiated images includes a specific object and a pattern image; calculate an object distance between the specific object and the at least one camera, based on the pattern-irradiated images of the plurality of different viewpoints; generate non-pattern-irradiated images that include the specific object without the pattern image; extract feature values of the specific object from the non-pattern-irradiated images based on a plurality of filters; determine a position of the specific object based on the extracted feature values; calculate a sum score by addition of the extracted feature values corresponding to the plurality of filters; and detect the specific object based on the calculated sum score and the determined position.