Video scaling method and device

摘要

A linear interpolator and decimating FIR filter with constant coefficients in various configurations to scale a still or moving color video image horizontally or vertically. For downscaling, the input pixel stream is initially upscaled with an interpolator by an upscaling factor of between one and two chosen so that the result can be subsequently downscaled with a decimation-by-power-of-two finite impulse response (FIR) filter. Upscaling is accomplished by means of linear interpolation. Vertical and horizontal scaling may be performed with different, independent scaling factors. <IMAGE>