A color interpolation method and a device are disclosed. The color interpolation method includes (a) setting a grid noise coefficient; (b) computing a grid noise offset by using the grid noise coefficient set in the step of (a); (c) extracting a pixel value only from a Bayer pattern image regardless of R, G and B values and computing edge directional information; (d) determining a condition of the edge directional information, computed in the step of (b), among a plurality of predetermined conditions, each of the plurality of predetermined conditions corresponding to a color interpolation parameter computing algorithm and the grid noise offset being used as a parameter of the color interpolation parameter computing algorithm corresponding to each of the conditions; and (e) computing a color interpolation parameter based on the color interpolation parameter computing algorithm corresponding to the condition of the edge directional information, determined in the step of (d).