Sampling
It is the process of digitising a.k.a converting into digital form the image co-ordinates i.e x and y values.
Quantization
It is the process of digitising a.k.a converting into digital form the image’s amplitude values.

It is the process of digitising a.k.a converting into digital form the image co-ordinates i.e x and y values.
It is the process of digitising a.k.a converting into digital form the image’s amplitude values.
