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 average value of pixels surrounding the object pixel; obtain an enhanced pixel value by comparing a value of the object pixel of the input image with the average value; and adaptively combine the enhanced pixel value with the value of the object pixel based on combination coefficients, wherein the combination coefficients are determined by a relationship between the edge data of the object pixel and a brightness of the object pixel.