ABSTRACT
In order to be handled by computers, the images must be digitized. For the analogue continuous-space continuous-value twodimensional image (Equation 1.1), it means
discretization
of two kinds: spatial sampling and amplitude quantizing. This way, the analogue function is replaced by its discrete representation: a matrix of numbers. In the present chapter, we shall analyze theoretically the concept of discretization, its consequences and related limitations, and ways in which to convert the discrete representation back into the analogue image form. As before, we shall mostly cover two-dimensional still images; the results can be easily generalized to multidimensional cases.
