03/18/2003
15-462 Graphics I
18
Signals and Filtering
•Audio
recording is 1D signal: amplitude(t)
•Image
is a 2D signal: color(x,y)
•Signals
can be continuous or discrete
•Raster
images are discrete
–In
space: sampled in x, y
–In
color: quantized in value
•Filtering:
a mapping from signal to signal