| 摘要 |
A camera image receiving unit (44) receives video images (21) from a camera (20) observing a scene including a subject (10). A mask signal generating unit (46) generates a mask signal (43) that defines marked areas of the video images corresponding to the subject. A content substitution unit (47) substitutes the marked areas with alternate image content (42) according to the mask signal to output modified camera images (41). An image selector unit (48) selects the alternate image content amongst at least a first alternate image content (42a in fig. 4) when the subject is determined to be in a first condition within the scene and a second alternate image content (42b in fig. 4) when the subject is determined to be in a second condition within the scene. The first and second alternate image contents may be selected based on a determined camera zoom value or a camera angle. The subject may be marked using active illumination, e.g. using infra-red LEDs, and detected using a detector (60). |
