Colour analysis and verification of CCTV images under different lighting conditions

R. A. Smith; K. MacLennan-Brown; J. F. Tighe; N. Cohen; S. Triantaphillidou; L. W. MacDonald

doi:10.1117/12.766343

28 January 2008 Colour analysis and verification of CCTV images under different lighting conditions

R. A. Smith, K. MacLennan-Brown, J. F. Tighe, N. Cohen, S. Triantaphillidou, L. W. MacDonald

Proceedings Volume 6808, Image Quality and System Performance V; 68080Y (2008) https://doi.org/10.1117/12.766343
Event: Electronic Imaging, 2008, San Jose, California, United States

Abstract

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. 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.

Citation Download Citation

R. A. Smith, K. MacLennan-Brown, J. F. Tighe, N. Cohen, S. Triantaphillidou, and L. W. MacDonald "Colour analysis and verification of CCTV images under different lighting conditions", Proc. SPIE 6808, Image Quality and System Performance V, 68080Y (28 January 2008); https://doi.org/10.1117/12.766343

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