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Smith, Rebecca J.; MacLennan-Brown, Ken; Triantaphillidou, Sophie; MacDonald, Lindsay W.; Tighe, John F.; Cohen, Neil
Publisher: IS&T - The Society for Imaging and Science and Technology and SPIE
Languages: English
Types: Part of book or chapter of book
Subjects: UOW3
Colour information is not faithfully maintained by a CCTV imaging chain. Since colour can play an important role in identifying objects it is beneficial to be able to account accurately for changes to colour introduced by components in the chain. With this information it will be possible for law enforcement agencies and others to work back along the imaging chain to extract accurate colour information from CCTV recordings.\ud A typical CCTV system has an imaging chain that may consist of scene, camera, compression, recording media and display. The response of each of these stages to colour scene information was characterised by measuring its response to a known input. The main variables that affect colour within a scene are illumination and the colour, orientation and texture of objects. The effects of illumination on the appearance of colour of a variety of test targets were tested using laboratory-based lighting, street lighting, car headlights and artificial daylight. A range of typical cameras used in CCTV applications, common compression schemes and representative displays were also characterised.\ud
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

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    • C.S. McCamy, H. Marcus and J.G. Davidson, "A Color Rendition Chart," Journal of Applied Photographic Engineering 11(3) Summer issue, 1976, 95-99.
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    • E. Allen, S. Triantaphillidou and R.E. Jacobson, “Image quality comparison between JPEG and JPEG2000. I.
    • Psychophysical Investigation”, Journal of Imaging Science and Technology, 51, 2007.
    • S. Triantaphillidou, E. Allen and R.E. Jacobson, “Image quality comparison between JPEG and JPEG2000. II. Scene dependency, scene analysis and classification”, Journal of Imaging Science and Technology, 51, 2007.
    • British Standard: 61966-3:2000, Multimedia systems and equipment - Colour measurement and management - Part 3: Equipment using cathode ray tubes.
    • A.M. Ford et al, Assessment of a CRT Display System, Journal of Photographic Science, Vol. 44, 1996.
    • British Standard: 61966-4:2000, Multimedia systems and equipment - Colour measurement and management - Part 4: Equipment using liquid crystal display panels.
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