According to one embodiment, an image feature emphasis device, a road surface feature analysis device, an image feature emphasis method, and a road surface feature analysis method which can improve the accuracy of detection of features of a road surface in a road surface image are provided. The image feature emphasis device includes a region acquirer and an image feature emphasis processor. The region acquirer acquires a region of a road surface portion from an image that has been captured. The image feature emphasis processor emphasizes a feature of the acquired region of the road surface portion by changing brightness values in the region of the road surface portion on the basis of a maximum brightness value and a minimum brightness value in the region of the road surface portion.
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