1. An image evaluation apparatus comprising: a memory; and a hardware processor configured to: calculate a feature descriptor that indicates a feature of an image for each pixel position in image data; produce a score that evaluates the feature descriptor for each pixel position in the image data; calculate, for each pixel position in the image data, a cumulative score obtained by accumulating all scores in an area including a minor angle that is formed by a half line extending in a predetermined first direction from the each pixel position serving as a starting point and another half line extending in a predetermined second direction from the each pixel position, and write the calculated cumulative score in the memory; designate a plurality of quadrilateral areas by changing a location and a size, each of the plurality of quadrilateral areas enclosed by two lines that are in parallel with the first direction and two lines that are in parallel with the second direction; and with respect to each of the designated quadrilateral areas, read cumulative scores at pixel positions at vertexes of the designated quadrilateral area from the memory, and calculate an area evaluation value that is a total of the scores in the designated quadrilateral area on the basis of the cumulative scores which have been read from the memory.