| 摘要 |
<p>A system for automatically generating and adding secondary video images (such as advertising material) to primary video images or real world scenes (such as a live sports event) in such a way that the secondary image appears to be physically present in the scene represented by the primary image when the composite image is viewed subsequently. A 'live' image from one of a number of cameras (10) is selected by an editing desk (12) for transmission. Prior to transmission, a secondary image is selected from a database (20) for inclusion in the final image, such that it appears superimposed on a physical target space in the first image. The selected image is transformed in terms of size, shape, orientation and lighting effects before being combined with the primary image. The transformation is based on a computed 'expected image', which is derived from a computer model (16) of the environment containing the first image (such as a sports arena) and data transmitted from the camera regarding its location, orientation, focal length, etc. The expected image is matched with the first image in a matching module (24) to refine the alignment of the computed target space with the actual target space, and to identify lighting variations and foreground objects in the first image and apply these to the second image as seen in the final composite image. Multiple composite images may be generated including different secondary images so that, for example, different advertisements can be included in different composite images for transmission to different audiences.</p> |
