PT Journal
AU Grau, O
   Easterbrook, J
TI Effects of camera aperture correction on keying and compositing of broadcast video
SO JVRB - Journal of Virtual Reality and Broadcasting
PY 2010
VL 7(2010)
IS 9
DI 10.20385/1860-2037/7.2010.9
DE Image processing; colour-based segmentation; keying; matting
AB This contribution discusses the effects of camera aperturecorrection in broadcast video on colour-based keying. Theaperture correction is used to ’sharpen’ an image and is oneelement that distinguishes the ’TV-look’ from ’film-look’. ’If avery high level of sharpening is applied, as is the case in manyTV productions then this significantly shifts the colours aroundobject boundaries with hight contrast. This paper discussesthese effects and their impact on keying and describes a simplelow-pass filter to compensate for them. Tests with colour-basedsegmentation algorithms show that the proposed compensationis an effective way of decreasing the keying artefacts on objectboundaries.
ER