1. An information processing device comprising: a conversion unit that performs conversion such that an area including a feature point and the periphery thereof in a specific target included in an image is set as a first area and, when one pixel included in the first area is set as a reference pixel, an area including the reference pixel and pixels in the periphery thereof is set as a second area, and, based on a comparison result of the feature amount of the reference pixel and the feature amount of another pixel included in the second area relating to the reference pixel, the feature amount of another pixel is converted for each pixel included in the second area; and a calculation unit that calculates a feature amount to be used in an identification process for identifying the specific target by performing computation for the value of each pixel included in the second area which is obtained from the conversion for each reference pixel for the position of each pixel included in the second area.