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* What is an Image? OR Explain a simple Image Model
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Image is two dimensional function f(x, y). The valu of f at (x, y) is the intensity (brightness) of the image at that point. i.e.

Where, = illumination

= reflectance

Intensity of Monochrome image f at (x, y) is called a Gray Level () of the image at that point.

8-bit image,

No of gray levels =

L = 256 i.e.

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