When testifying about our work, we are often faced with surprise questions during cross examination. We think we know the fundamentals, but may freeze when asked about things that we may have learned years ago. For example, answer this: "what is an image?"
How would you answer the question?
If we consider the way in which images are displayed and quantified, a definition emerges. "An image is a bi-dimensional function of light intensity perceived by the human eye."
It's bi-dimensional - X /Y. For example, 2CIF can be described as 704x240 - two dimensions.
It's a function of light intensity. The three colour channels are simple representations of light intensity in a specific range of wavelengths (R,G,B).
When these black and white channels that represent specific intensities or wavelengths are combined, we perceive with our vision / perception system them as full colour.
Thus, an image is a bi-dimensional function of light intensity perceived by the human eye.
Enjoy.
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