By Marc Ebner
A human observer is ready to realize the colour of gadgets regardless of the sunshine used to light up them. this can be known as colour fidelity. A camera makes use of a sensor to degree the mirrored mild, that means that the measured colour at every one pixel varies in response to the colour of the illuminant. accordingly, the ensuing shades is probably not similar to the colours that have been perceived through the observer. acquiring colour consistent descriptors from photograph pixels is not just vital for electronic images, but in addition useful for computing device imaginative and prescient, color-based computerized item popularity, and colour snapshot processing in general.
This ebook presents a finished advent to the sector of colour fidelity, describing the entire significant colour fidelity algorithms, in addition to offering innovative study within the zone of colour snapshot processing. starting with an in-depth examine the human visible approach, Ebner is going on to:
- examine the speculation of colour photo formation, colour copy and varied colour spaces;
- discuss algorithms for colour fidelity less than 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 examine this to info got from experimental psychology;
- set out the various algorithms as pseudo code in an appendix on the finish of the book.
Color Constancy is a perfect reference for practicing engineers, machine scientists and researchers operating within the quarter of electronic colour photo processing. it will probably even be beneficial for biologists or scientists commonly who're attracted to computational theories of the visible mind and bio-inspired engineering platforms.
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Additional info for Color Constancy
14 Position of the visual areas V1, V2, V3, V4 and V5. The image in (a) shows the medial side of the left hemisphere of the brain. Color processing is done in V4, and motion is processed in V5. (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).
Cells above layer 4C receive input from both eyes; however, one eye is usually dominant. Hence, these blocks of cells are called ocular dominance columns. Cells located at the center of a column are connected to only one eye. 10 Structure of the primary visual cortex. The primary visual cortex consists of six layers. Vertical columns (blobs) are found in layer 2, 3, 5, and 6. (Copyright 1984 by the Society for Neuroscience. Reproduced by permission of Society for Neuroscience. M. S. Livingstone and David H.
The function of 25 of these areas is primarily visual. The remaining areas are used for visual tasks in combination with other actions such as visually guided motor control. Each aspect of the visual information, such as the shape of an object, its color, and direction of motion, is processed in separate visual areas. Each area both receives and sends signals (Zeki 1999). There is no master or terminal area where the data is finally analyzed. The information is processed in a distributed fashion.