Patent ID: 6680752
Filing Date: 2004-01-20
Classification: H04N

Abstract:
An overlay scaler comprising:a de-interlacing circuit operatively coupled to receive field data from a first field and field data from a second field and operative to produce de-interlaced data; a vertical scaling circuit operatively coupled to receive the de-interlaced data and to produce vertically scaled data; and a horizontal scaling circuit operatively coupled to receive the vertically scaled data from the vertical scaling circuit and to produce horizontally scaled data; wherein the de-interlacing circuit comprises de-interlacing logic operative to compute an output pixel (PIXOUT) of the second field based on values of an input pixel (PIXIN) of the second field, a bottom pixel (BOTTOM) of the first field, the BOTTOM being a pixel spatially below (PIXIN), a top pixel (TOP) of the first field, TOP being a pixel spatially above PIXIN, and a forth pixel (4TH) of the second field, the 4TH being a pixel spatially above or below PIXIN, wherein PIXOUT is computed according to an input/output curve that converges to an average of BOTTOM and TOP.