1. An interpolation processing apparatus that engages in processing on image data which are provided in a calorimetric system constituted of first˜nth (n≧2) color components and include color information corresponding to a single color component provided at each pixel to determine an interpolation value equivalent to color information corresponding to the first color component for a pixel at which the first color component is missing, comprising: an interpolation value calculation section that, by using color information at pixels located in a local area containing an interpolation target pixel, calculates the interpolation value including, at least (1) a local average value of the first color component with regard to the interpolation target pixel and (2) local curvature values for at least two color components, respectively, with regard to the interpolation target pixel.