Picture function
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A picture function is a mathematical representation of a two-dimensional image as a function of two spatial variables. The function f(x,y) describes the intensity[disambiguation needed 
] of the point at coordinates (x,y).
[edit] References
- Forsyth, David; Ponce, Jean (2002). Computer Vision: A Modern Approach. Prentice-Hall. ISBN ISBN 978-0130851987. http://www.cs.berkeley.edu/~daf/book.html.
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