DOWN1 down samples x
y=down1(x)
image y is obtained from image x by summing and downsampling
Author: Ali Mohammad-Djafari
Date: Nov. 4, 2002
Test:
x=rand(6); y=down1(x);
CROSS-REFERENCE INFORMATION
This function calls:
This function is called by:
build_pyr BUILD_PYR constructs a particular pyramid (Haar) on matrix im.
