1. A digital signal processor comprising: a memory that stores an input image; and a processor coupled to the memory that executes instructions to: detect edge data of an object pixel; obtain an enhanced pixel value by comparing an object pixel value of the input image with values of pixels surrounding the object pixel; and combine the enhanced pixel value with the target pixel value adaptively based on combination coefficients, wherein the combination coefficients are determined by a relationship between both of the edge data and brightness of the object pixel.