Patent ID: 7414632

Claim:
A method of blending a subpicture signal and a video signal comprising: receiving a subpicture signal, the subpicture signal providing a plurality of alpha values and information identifying or to identify a plurality of subpicture Y, U and V values; receiving a video signal, the video signal including a set of Y values, a set of U values and a set of V values provided in a planar format; blending, in a first pass, each of the Y values of the video signal with a corresponding Y value of the subpicture signal based on a corresponding alpha value to generate a set of blended Y values; blending, in a second pass, each of the U values of the video signal with a corresponding U value of the subpicture signal based on a corresponding alpha value to generate a set of blended U values; blending, in a third pass, each of the V values of the video signal with a corresponding V value of the subpicture signal based on a corresponding alpha value to generate a set of blended V values; wherein the generated sets of blended Y values, U values and V values are provided in a planar format and the Y, U and V values of the video signal are provided in a 4:2:0 format, and wherein the steps of bending are performed using multiple passes in a 4:2:0 format.