1. An image processing apparatus, comprising: a color image processor configured to generate a first transformed image with lower-resolution and higher-brightness than those of a first image including color information corresponding to a wavelength band of visible light, from the first image; an edge information extractor configured to extract edge information from a second image including image information of a band wider than that of the first image, wherein the second image is an image captured from the same scene as the first image; and an image restoring unit configured to generate a restored image using the first transformed image and the edge information of the second image, wherein the brightness of the first transformed image is increased by a degree corresponding to a decrease in the resolution of the first transformed image.