An image processing apparatus includes a definer for defining pixel areas in image data acquired on a per-line basis, each pixel area being. used for calculating a pixel value of an interpolation pixel for interpolating a missing pixel; a read out controller for accessing, in a memory storing the image data of one line, a leading address among addresses corresponding to pixels in an Nth pixel area, and reading out pixel values of the pixels in the Nth pixel area; and a calculator for calculating a pixel value of an Nth interpolation pixel by using the pixel values of the Nth pixel area. The read out controller accesses a leading address among addresses corresponding to pixels in an (N+1)th pixel area, and reads out pixel values of the pixels in the (N+1)th pixel area, after the pixel value of the Nth interpolation pixel is calculated.