Constancy, colour

Figure 8.14 Neural architecture of Usui and Nakauchi (1997). The architecture consists of four layers denoted by A, B, C, and D. The input image is fed into the architecture at the input layer. Layer D is the output layer. (Redrawn from Figure 8.4.1 (page 477) Usui S and Nakauchi S 1997 A neurocomputational model for colour constancy. In (eds. Dickinson C, Murray I and Carded D), John Dalton s Colour Vision Legacy. Selected Proceedings of the International Conference, Taylor Francis, London, pp. 475-482, by permission from Taylor Francis Books, UK.)...

Finlayson GD and Schaefer G 2001 Solving for colour constancy using a constrained dichromatic reflection model. International Journal of Computer Vision 42(3), 127-144. 

Forsyth DA 1988 A novel approach to colour constancy Second International Conference on Computer Vision (Tampa, FL, Dec. 5-8). IEEE Press, pp. 9-18. 

Funt B, Barnard K and Martin L 1998 Is machine colour constancy good enough In Fifth European Conference on Computer Vision (ECCV 98), Freiburg, Germany (eds. Burkhardt H and Neumann B), pp. 445-459. Springer-Verlag, Berlin. 

Herault J 1996 A model of colour processing in the retina of vertebrates from photoreceptors to colour opposition and colour constancy phenomena. Neurocomputing 12, 113-129. 

Kennard C, Lawden M, Morland AB and Ruddock KH 1995 Colour identification and colour constancy are impaired in a patient with incomplete achromatopsia associated with prestriate cortical lesions. Proceedings of the Royal Society of London B 260, 169-175. 

McCann JJ 1997 Adaptation or contrast the controlling mechanism for colour constancy In John Dalton s Colour Vision Legacy. Selected Proceedings of the International Conference (eds. Dickinson C, Murray I and Carden D), pp. 469-473. Taylor Francis, London. 

Smithson, H. E., Sensory, Computational and Cognitive Components of Human Colour Constancy, Philos. Trans. R. Soc. Lond. B Biol. Sci. 2005, 360, 1329 1346. 

Stephen Westland continues the topic of human perception of colour in Chapter 4. He describes the retinal image and the effects of the surroundings on the perception and appearance of colour, especially the phenomena of colour constancy and colour contrast. The importance of white as a reference point in the field of human vision and its role in adaptation is presented. The development of colour appearance models is outhned and the relationship of these uniform colour space models to their use in the formation of digital image... 

There are six specific areas, VI to V6, within the visual cortex responsible for the perception of different aspects of appearance. VI responds to orientation, real and imaginary boundaries, and has some wavelength response. It also detects overlapping features in the scene. Cells in V2 are sensitive to colour, motion, orientation and stereoscopic featnres. V3 is sensitive to form and depth. V4 is sensitive to colour and is the site responsible for the maintenance of colour constancy. V5 analyses motion and V6 is responsible for analysing the absolute position of an object in space (Lee... 

BRILL, M. H. and WEST, G. (1986) Chromatic adaptation and colour constancy a possible dichotomy. Color Research and Application, 11, 196-204. 

A further limitation of the original CIE system is illustrated by Fig. 4.1 where the two grey patches ate physically identical, create the same local rate of photopigment absorption, and give the same cone excitations according to Equation 4.1. Yet, they appear to be veiy different in lightness because of the difference in their excitations relative to nearby areas. Thus whereas colour constancy demonstrates that patches of colour that have different tristimulus defiiutions can have the same colonr appearance, simultaneous colour contrast demonstrates that patches of colonr that have the same tristimulus definitions... 

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