Derivation of studio camera postion and motion from the camera image

摘要

Studio camera position and motion may be derived from the camera image by separating out the background 12 and deriving, from a background having a number of areas 30 of hue and/or brightness different from adjacent areas 32, estimates of movement from one image to the next. The initial image is stored 16 as a reference and amended 18 with predicted motion value. The amended image is compared 20 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.