Effects of camera aperture correction on keying and compositing of broadcast video Grau Oliver Easterbrook Jim This contribution discusses the effects of camera aperture correction in broadcast video on colour-based keying. The aperture correction is used to ’sharpen’ an image and is one element that distinguishes the ’TV-look’ from ’film-look’. ’If a very high level of sharpening is applied, as is the case in many TV productions then this significantly shifts the colours around object boundaries with hight contrast. This paper discusses these effects and their impact on keying and describes a simple low-pass filter to compensate for them. Tests with colour-based segmentation algorithms show that the proposed compensation is an effective way of decreasing the keying artefacts on object boundaries. Image processing colour-based segmentation keying matting 004 periodical academic journal JVRB - Journal of Virtual Reality and Broadcasting 7(2010) 9 2010 1860-2037 urn:nbn:de:0009-6-26693 10.20385/1860-2037/7.2010.9 http://nbn-resolving.de/urn:nbn:de:0009-6-26693 grau2010