By Marc Ebner
A human observer is ready to realize the colour of items regardless of the sunshine used to light up them. this is often referred to as colour fidelity. A camera makes use of a sensor to degree the mirrored mild, which means that the measured colour at each one pixel varies in line with the colour of the illuminant. for that reason, the ensuing colours is probably not just like the colours that have been perceived via the observer. acquiring colour consistent descriptors from picture pixels is not just vital for electronic images, but additionally invaluable for laptop imaginative and prescient, color-based automated item acceptance, and colour photograph processing as a rule.
This ebook presents a entire advent to the sphere of colour fidelity, describing the entire significant colour fidelity algorithms, in addition to featuring leading edge learn within the zone of colour picture processing. starting with an in-depth examine the human visible method, Ebner is going on to:
- examine the speculation of colour snapshot formation, colour replica and varied colour spaces;
- discuss algorithms for colour fidelity below either uniform and non-uniform illuminants;
- describe equipment for shadow elimination and shadow attenuation in electronic images;
- evaluate a number of the algorithms for item reputation and colour fidelity and evaluate this to facts acquired 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, laptop scientists and researchers operating within the region of electronic colour photo processing. it may well even be important for biologists or scientists in most cases who're drawn to computational theories of the visible mind and bio-inspired engineering systems.
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Additional info for Color Constancy
21 with the pieces of papers shown at the bottom of the graph. 55. Lightness and reflectance are not linearly related. 21 Relationship between lightness and reflectance. Achromatic papers are arranged on an equally spaced lightness scale by human observers. For each paper, the corresponding reflectance is shown in the graph (data from Land 1974). for some constant k (Hunt 1957). Instead of a square root relationship, a cube root relationship has also been suggested. 22 shows several different fits for the relationship between reflectance and lightness.
Metamers cannot be distinguished by postprocessing the available data. Thus, color constancy can only hold approximately. 6 Involvement of the Visual Cortex in Color Constancy Land (1983, 1986b); Land et al. (1983) also showed that the visual cortex is involved in color perception. Originally, it was not known whether the computation of color constant descriptors is carried out inside the retina or the visual cortex. Marr (1974) suggested in 1974 that lightness computations are carried out inside the retina.
Originally, it was not known whether the computation of color constant descriptors is carried out inside the retina or the visual cortex. Marr (1974) suggested in 1974 that lightness computations are carried out inside the retina. 23 Stimuli used by Land to determine if the visual cortex is also involved in color perception. Note that the colors shown here are just meant to illustrate the experiment. They do not correspond to the colors used by Land et al. Land covered one half of a color Mondrian with black velvet.