1. A method for zooming images suitable for altering the size of a source image frame in both horizontal and vertical directions to generate a destination image frame, the method for zooming images comprising: multiplying the frequency of a horizontal sync signal to generate an operating clock signal, wherein the horizontal sync signal is synchronized with the source image frame; sampling the source image frame by using the operating clock signal and generating a sampled image frame; performing a horizontal zooming operation on the sampled image frame by using the operating clock signal, and generating a horizontal image frame; and performing a vertical zooming operation on the horizontal image frame by using the operating clock signal, and generating a vertical image frame.