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:
