MULTI-LAYER VIDEO/GRAPHICS BLENDING INCLUDING IDENTIFYING COMPOSITED NON-TRANSPARENT REGIONS IN THE ALPHA MULTIPLIED OVERLAY

摘要

Methods (200) (300) in accordance with the present invention identify composited non-transparent regions in a video/graphics overlay during color conversion and alpha blending (206). Individual non-transparent regions are merged into larger such regions if not separated by at least a predetermined distance. Regions that are so determined are blended (214) with target regions in the main video plane. Transparent regions are not blended with the main video data, thereby reducing the computational and memory bandwidth requirements. In a further aspect of the present invention, although the distance is predetermined, it may be dynamically scaled to optimize CPU resources.