1. A system for processing a video signal, the system comprising: a pixel sampling module configured to define a horizontal sampling window and a vertical sampling window within a block in a video frame of the video signal, the horizontal and vertical sampling windows configured to sample a set of pixel values; a signal processor configured to calculate a fast Fourier transform (FFT) of the pixel values in the horizontal sampling window for forming a horizontal frequency spectrum and in the vertical sampling window for forming a vertical frequency spectrum; a spectrum analyzer configured to: compute a horizontal power spectrum from the horizontal frequency spectrum and a vertical power spectrum from the vertical frequency spectrum, analyze the horizontal and vertical power spectrums for the presence of a peak, wherein the presence of the peak within the horizontal or the vertical power spectrums indicates the presence of a periodic pattern for the set of pixel values within the video frame; and a mixer for obtaining an enhanced interpolated pixel from an interpolated pixel according to the presence of the periodic pattern within the video frame, for displaying on a screen.