3
What is an image?
We can think of an image as a function, f, from R2 to R:
wf( x,
y ) gives the intensity
at position ( x, y )
wRealistically, we expect the image
only to be defined over a rectangle, with a finite range:
•f: [a,b]x[c,d] à [0,1]
A
color image is just three functions pasted together. We can write this as a “vector-valued” function:
