Patent ID: 7286721

Claim:
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, wherein three variables of Δ Y 1 =|Y 2i,2j −Y 2i+2p,2j+2q |, p,q ∈{(0,1),(1,0)}, Δ Y 2 =|Y 2i+2,2j −Y 2i,2j+2 |, and Δ Y 3 =|Y 2i,2j −Y 2i+2,2j+2 | are used to determine whether the homogenous area or the edge area by a condition set of: if ΔY 1 <the threshold then the pixel Y 2i+p,2j+q is in the homogenous area else the pixel Y 2i+p,2j+q is in the edge area as one of edge pixels; if ΔY 2 <the threshold and ΔY 3 <the threshold then the pixel Y 2i+1,2j+1 is in the homogenous area else if ΔY 2 <the threshold then the pixel Y 2i+1,2j+1 is in the homogenous area else if ΔY 3 <the threshold then the pixel Y 2i+1,2j+1 is in the homogenous area else the pixel Y 2i+1,2j+1 is in the edge area as one of edge pixels; 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.