By Marc Ebner
A human observer is ready to realize the colour of items without reference to the sunshine used to light up them. this is often known as colour fidelity. A digicam makes use of a sensor to degree the mirrored mild, which means that the measured colour at every one pixel varies in accordance with the colour of the illuminant. accordingly, the ensuing shades will not be kind of like the colours that have been perceived through the observer. acquiring colour consistent descriptors from snapshot pixels isn't just very important for electronic images, but in addition beneficial for machine imaginative and prescient, color-based automated item popularity, and colour picture processing in general.
This publication offers a entire advent to the sphere of colour fidelity, describing all of the significant colour fidelity algorithms, in addition to providing leading edge learn within the quarter of colour photo processing. starting with an in-depth examine the human visible method, Ebner is going on to:
- examine the speculation of colour snapshot formation, colour copy and diverse colour spaces;
- discuss algorithms for colour fidelity less than either uniform and non-uniform illuminants;
- describe tools for shadow removing and shadow attenuation in electronic images;
- evaluate a number of the algorithms for item reputation and colour fidelity and examine this to info received from experimental psychology;
- set out different algorithms as pseudo code in an appendix on the finish of the book.
Color Constancy is a perfect reference for practicing engineers, desktop scientists and researchers operating within the quarter of electronic colour snapshot processing. it might even be valuable for biologists or scientists typically who're attracted to computational theories of the visible mind and bio-inspired engineering structures.
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Additional resources for Color Constancy
Reproduced from S. Zeki. An Exploration of Art and the Brain. Oxford University Press, Oxford, 1999 by permission of S. ) specialization in the visual cortex of the rhesus monkey is given by Zeki (1978). Similar functional specialization is also found in the human visual cortex (Zeki et al. 1991). V1 mainly connects to area V2, which surrounds V1 (Tov´ee 1996). Area V2 seems to be organized into three types of stripes, the so-called thick, thin, and interstripes. The stripes seem to be used to process visual orientation (thick stripes), color (thin stripes), and retinal disparity (interstripes).
It may be constructed by receiving input from several simple cells. (Reproduced from D. H. Hubel and T. N. Wiesel. Receptive fields, binocular interaction and functional architecture in the cat’s visual cortex. Journal of Physiology, Vol. 160, pp. ) They respond to light of a particular wavelength and either show a color opponent or a double opponent behavior. These cells receive their input from color opponent cells of the lateral geniculate nucleus. They have a larger receptive field compared with the cells found inside the lateral geniculate nucleus.
It was found that visual area V4 contains cells that respond to the color of objects irrespective of the wavelength composition of the light reflected by the object. Land again used a color Mondrian for his experiment. He covered one half of the Mondrian with black velvet. 23. The purple piece of paper was bounded by the velvet on three sides. A subject whose corpus callosum was cut off for medical reasons was asked to view the Mondrian. The subject was asked to fixate rotating bilaterally symmetrical letters that were shown at the center of the Mondrian.