A system and method which mixes images, such as an advertisement, with a video stream of action occurring within a relatively unchanging space, such as a playing field, is disclosed. The system utilizes a model of the background space to change the video stream so as to include the image at some location within the background space. It includes a video frame grabber (10) and an image implantation system (14). The frame grabber (10) grabs a single frame of the video signal at one time. The image implantation system (14) typically implants the grabbed image into the frame onto a predefined portion of a preselected one of the surfaces of the background space if the portion is shown in the frame.