Patent ID: 7468756
Filing Date: 2008-12-23
Classification: H04N

Abstract:
1. A method of detecting and locking onto a field phase of a 2:2 pull-down video signal comprising: computing an approximation of the luminance for each absent pixel of an output video frame, said computing using one or more present pixels, said one or more present pixels originating from a field of a source film frame; computing one or more first differences using said approximation of the luminance for each absent pixel in said output video frame and corresponding present pixels in one or more adjacent fields of said output video frame; categorizing said one or more first differences into expected low values or expected high values based on each of two field phases; computing one or more first second differences over said each absent pixel of said output video frame, said one or more first second differences based on a first of said two field phases; and computing one or more second second differences over said each absent pixel of said output video frame, said one or more second second differences based on a second of said two field phases, each second difference of said one or more first second differences and said one or more second second differences used to measure a detector pixel unexpected motion of said each absent pixel of said output video frame, said one or more first second differences and said one or more second second differences computed by subtracting the maximum of said expected low values by an average of said expected high values.