Patent ID: 7885487

Claim:
A method for efficiently enlarging an image by using edge signal components, the method comprising: detecting edge signals of an image by means of outermost Discrete Cosine Transform (DCT) components from a DC value on a two-dimensional coordinate system; generating a binary edge mask by means of the detected edge signals, the binary edge mask indicating a distribution of high frequency components within the image; determining an order of a low pass filter based on the generated binary edge mask; and performing interpolation according to the determined filter order, wherein the binary edge mask is generated according to b ⁡ ( i , j ) = ( 1 if ⁢ ⁢ s ⁡ ( i , j ) ≥ d ⁡ ( 0 , 0 ) 0 else ) , where s(i,j) represents an edge detected signal, b(i,j) represents the binary edge mask located in an i th row and j th column within an 8*8 image block, and a threshold value employs d(0, 0) as a reference on the two-dimensional coordinate, which represents a DC value of the 8*8 image block.