Broadly speaking, a digital image can be represented in two types, namely:
Raster
The image is a collection of dots, each of which describes the color
Vector
The image is a group of build-up that defined mathematically.
Digital Image Model
This type of digital image processing will be discussed in this is the type of raster image. So the image is seen as a collection of dots called pixels ( pixel /pels : Picture elements) as shown below:
From the figure above shows that an image can be regarded as a two dimensional array or matrix of a pixel value. The terms of rows and columns can also be replaced with the position x and y and the pixel values are denoted by z who has a relationship z = f (x.y) which means the pixel value is a function of position in x and y.
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