1. An apparatus comprising: an interface configured to receive image content comprising a first resolution; a display device configured to display image content at a second resolution, the second resolution greater than the first resolution; and one or more processors configured to: convert the image content from the first resolution to the second resolution; recover a spatial frequency of the converted image content as a function of a relative edge growth rate measured from the converted image content and an offline-determined relationship between the relative edge growth rates of the converted first image and an associated reference value; and provide the converted image content with the recovered spatial frequency to the display device, wherein recovering the spatial frequency of the converted image content comprises: determining the relative edge growth rate of an edge transition unit associated with an edge in the converted first image, and adjusting the relative edge growth rate as a function of an offline-determined adjustment factor, the offline-determined adjustment factor corresponding to a determined significance value of the edge.