1. A method of evaluating image information, comprising: extracting, by an image processor, an edge pixel from image information to be evaluated; determining, by the image processor, a scan direction based on an edge gradient of the image information; finding, by the image processor, from among pixels located in a negative direction of the scan direction with respect to the edge pixel, a first pixel for which a difference in luminance between the first pixel and a pixel adjacent thereto is the largest; finding, by the image processor, from among pixels located in a positive direction of the scan direction with respect to the edge pixel, a second pixel for which a difference in luminance between the second pixel and a pixel adjacent thereto is the largest; and performing out-of-focus blurring evaluation of the image information, by the image processor, on the basis of a distance between the first pixel and the second pixel.