A method of processing an image in a device, and the device thereof are provided. The method includes determining a distortion correction ratio of each of a plurality of vertices included in a source image, based on information about a lens through which the source image is projected, determining corrected location information of pixels located between the plurality of vertices, based on the distortion correction ratio of each of the plurality of vertices and interpolation ratios of the pixels, and rendering a distortion-corrected image including pixels determined as a result of performing interpolation on the plurality of vertices based on the corrected location information.