VIDEO SIGNAL PROCESSOR AND METHOD FOR SECONDARY IMAGES

A processing unit (13) for providing secondary images in a video display system (10) in accordance with a choice of scaling ratios. The processing unit (13) scales the luminance component of an analog input signal by first using an analog low pass filter (22) for anti-aliasing, and then sampling (23) the data at a rate appropriate for the selected scaling ratio. The sampled data is processed by a digital filter (24), on a line-by-line basis, which provides weighted average values derived from the sampled data, on a line-by-line basis. A formatter (25) combines sampled chrominance data with the filtered luminance data, and selects lines for inclusion in the secondary image.