An introduction to direct methods : the most important phase by H Schenk; International Union of Crystallography

By H Schenk; International Union of Crystallography

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Extra info for An introduction to direct methods : the most important phase relationships and their application in solving the phase problem

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An immediate key problem was that the world is three-dimensional while vision was limited to two dimensions. Processes needed to evolve that intelligently interpreted the two-dimensional information as estimates of the three-dimensional world. Where does an object end and another one begin? Which object has a desirable form and which one is to be avoided? Evolutionary competition soon indicated the additional desirability of more detailed analysis of the light interacting with the eyes. As mentioned in Chapter 1, electromagnetic radiation can have a wide range of energy levels.

When a certain group of these cells responds to stimuli, we may recognize, as a result, a certain face or object. Most of the processing going on in the cortex is at the subconscious level, as mentioned in Chapter 2. The validity of a relatively recent hypothesis that there are, at higher levels, two mostly independent systems is now likely considered to be an oversimplification. One of these, termed “where” and “on-line,” believed to be constantly active in the awake state, is concerned with eye movement and providing input to the control of physical motion, as well as reacting to immediate threats or opportunities.

REFERENCES CIE (International Commission on Illumination). 4, 1987. Koenderink, JJ. Color for the Sciences. Cambridge, MA: MIT Press, 2010. Merriam-Webster. Merriam-Webster dictionary and thesaurus. ”) Nassau, E. The physics and chemistry of color: the 15 mechanisms. In: Shevell, SK, editor, The Science of Color, 2nd edition. New York: Elsevier, 2003. Newton, I. Opticks. London: Smith and Walford, 1704. Turner, JE. Atoms, Radiation, and Radiation Protection. Weinheim, Germany: WileyVCH, 2007. 2 What Is Color and How Did We Come to Experience It?

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