1. An image interpolating method, wherein low resolution pixels Y ij of an image are zoomed to high resolution pixels Y 2i,2j , comprising: receiving the low resolution pixels Y ij ; determining a homogenous area and an edge area of the image based on pixel differences of the pixels Y 2i,2j in comparing with a threshold; interpolating the low resolution pixels belonging to the homogenous area into the high resolution pixels by a first interpolating algorithm; and interpolating the low resolution pixels belonging to the edge area into the high resolution pixels by a second interpolating algorithm.