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METHOD AND APPARATUS FOR ADDING SYNTHETIC SHADOWS ON A VIRTUAL SET

IP.com Disclosure Number: IPCOM000197219D
Publication Date: 2010-Jun-29
Document File: 4 page(s) / 41K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method and apparatus for adding synthetic shadows on a virtual set is disclosed. The method for adding synthetic shadows described herein utilizes visual tracking techniques. The visual tracking technique tracks the location of a person or several people on a set. The tracking is done such that synthetic shadows can be rendered at appropriate locations in the video, making it appear as if an actual shadow is cast on the virtual set.

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RP13418

METHOD AND APPARATUS FOR ADDING SYNTHETIC SHADOWS ON A VIRTUAL SET

BRIEF ABSTRACT

    A method and apparatus for adding synthetic shadows on a virtual set is disclosed. The method for adding synthetic shadows described herein utilizes visual tracking techniques. The visual tracking technique tracks the location of a person or several people on a set. The tracking is done such that synthetic shadows can be rendered at appropriate locations in the video, making it appear as if an actual shadow is cast on the virtual set.

KEYWORDS

    Synthetic shadows, virtual set, chroma key, soft chroma keyers, studio technology, visual tracking.

DETAILED DESCRIPTION

    Modern TV productions routinely apply virtual studio technology. Chroma keying is the principle method used for superimposing the live captured or recorded video signal of a physical blue or green screen studio with virtual content. Generally, the video signal is analyzed and video pixels with a predefined color (e.g. blue or green) are replaced by computer-generated graphics. This allows image processing techniques to efficiently separate the foreground from the background, and allow integration of objects, such as an actor, moderator or a shadow, seamlessly into a purely virtual environment.

    However, the visibility of shadows of a person moving around in the scene is impacted in virtual sets. Conventionally, chroma keying is used to determine

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RP13418

which regions in the video are to be replaced by virtual graphics. Chroma keying usually replaces a certain color in the video, for example green. Shadows unfortunately appear as a different shade of green. Shadows are often determined to be green regions that are replac...