Method and camera (apparatus) for optically capturing a screen

US7706634B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Peter Schmitt · Erlangen, DE
• Dieter Schmidt · Steinhagen, DE
• Guenther Kostka · Erlangen, DE
• Rolf Behrendt · Dormitz, DE

Key dates

• Filing date: Jul 19, 2005
• Grant date: Apr 27, 2010
• Expiry date: Nov 7, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N23/30
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A camera for optically capturing a screen, wherein the screen has an area and wherein a predetermined overall resolution is provided for the optical capture, comprises a camera support with an array of camera mounts, an array of optical individual cameras as well as an image processing device for processing digital individual images of the array of optical individual cameras to generate the optical capture of the screen with the predetermined overall resolution. The image processing device is effective to reduce a correction of the individual images with regard to alignment inaccuracies and/or parameter variations, wherein for correction purposes a correction resolution is used, which is higher than the overall resolution, and wherein for every individual camera an individual correction rule is used for the correction. After the correction has been performed, the corrected overall image is brought to the predetermined overall resolution by combining adjacent pixels. Thereby, with inexpensive individual cameras, an image of a large-format screen is obtained efficiently, inexpensively and with little artifacts.