The paper proposes an area-directed interpolation algorithm for color images.The basic idea is to first estimate first and second direction derivatives around interpolated pixels along the gradient directions from a low-resolution image and then identify constant zones

linear zones

and non-linear zones based on these direction derivatives in color image.Thus different filters are applied only to zones that require it.Experiment results demonstrate that our new interpolation algorithm substantially improves the quality of the interpolated images over conventional bilinear interpolation and possesses reconstruction cost less than pure complex filters.In addition

the proposed method can be used irrespective of the magnification factor (MF).