Abstract: A processor for expanding a compressed video signal includes a pixel interpolator which interpolates between input pixel values in two dimensions. This interpolator calculates and stores intermediate pixel values which are interpolated in the vertical direction. A pair of these intermediate pixel values are then fed back into the interpolator which performs a horizontal interpolation to produce pixel values that are interpolated in both the horizontal and vertical dimensions. In steady state operation, the horizontal and vertical interpolation operations are alternated to produce a stream of two-dimensionally interpolated values.

Abstract: Computer main memory is used for storing relatively densely sampled luminance information concerning a television display and for storing relatively sparsely sampled chrominance information concerning the same television display. The relatively densely sampled luminance information is read out in substantially real-time from computer main memory during line trace intervals in the television display. The relatively sparsely sampled chrominance information is read out of computer main memory in advanced and compressed time during selected line retrace intervals in the television display.