1. A device for removing a haze in a single image, the device comprising: an image analyzing unit configured to generate a dark channel prior representing a distance-dependent haze density in an input image including a haze component; a transmission estimating unit configured to calculate an estimated transmission by estimating an amount of light reaching a photographing device based on the dark channel prior; a transmission refining unit configured to calculate a refined transmission by applying weighted least square (WLS) filtering based on the estimated transmission and morphologically-processed input image information, wherein the refined transmission represents information obtained by preserving edge information and removing a block artifact in the estimated transmission; and an image restoring unit configured to generate a restored image by removing the haze component in the input image based on the refined transmission.