1. A method for contour noise elimination and edge enhancement in an electronic device, the method comprising: determining a Contour Counter (CC) representing a flat degree of each region of an input image and determining a type of each region of the input image according to the determined CC; determining a Bit Resolution Enhancement (BRE) parameter and an edge enhancement parameter of each region according to the determined region type; determining a first weight for each region of the input image based on the determined BRE parameter and enhancing a bit resolution of the input image based on the determined first weight to generate a bit-resolution-enhanced image; and determining a second weight for each region of the input image based on the determined edge enhancement parameter and performing the edge enhancement for the bit-resolution-enhanced image based on the determined second weight.