Derivation of studio camera position and motion from the camera image

USRE38420E1 · kind E1 · reissue

Assignee

• British Broadcasting Corporation · GB

Inventor

• Graham Thomas · Heathfield, GB

Key dates

• Filing date: Mar 25, 1998
• Grant date: Feb 10, 2004
• Expiry date: Mar 25, 2018

Classification

• Technology area (CPC —): General

Abstract

Studio camera position and motion may be derived from the camera image by separating out the background and deriving from a background having a number of areas of hue and/or brightness different from adjacent areas estimates of movement from one image to the next. The initial image is used as a reference and amended with predicted motion value. The amended image is compared with incoming images and the result used to derive translation and scale change information. Once the proportion of the reference image contained in an incoming image falls below a threshold a fresh reference image is adopted.