Patent ID: 11950014
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 20:
21. Method for differentiating between background and foreground of a scenery in images recorded by an electronic camera, the background showing an arbitrary image coded with a coding such that the image is visible for a direct observer of the background, and the background being differentiated from a non-coded foreground in a signal produced by an image sensor, recording the images, of the camera by the coding, wherein the coding comprises the background radiating or reflecting polarised light only of one specific polarisation direction or polarisation rotation, the light emanating from the scenery running through a colour filter and a polarisation filter before impinging on the image sensor, which filter is orientated such that it filters out light of that polarisation which is radiated and reflected from the background and differentiation of the background from the foreground being effected by keying on darker regions of the image recorded by the image sensor which have no colour tone of the colour filter.