Patent ID: 7215708

Claim:
A method for downscaling a spatial resolution of a first video signal to obtain a second video signal at a lower spatial resolution than the spatial resolution of the first video signal, said method comprising: frequency domain anti-aliasing filtering and downscaling the first video signal in a first direction corresponding with a line direction in the first video signal to obtain a downscaled video signal; and spatial domain downscaling the downscaled video signal in a second direction perpendicular to the first direction to obtain the second video signal, wherein the first video signal comprises groups of pixels, and if the grouns of pixels are included in sequences of field-type end frame-type encoded groups of pixels, then the field-type encoded groups of pixels are frequency domain anti-aliasing filtered in both the first direction and the second direction whereas the frame-type encoded groups of pixels are frequency domain anti-aliasing filtered in the first direction and spatial domain anti-aliasing filtered in the second direction.