next up previous print clean
Next: Helicon - Helix convolution Up: SERGEY'S MAIN PROGRAM DOCS Previous: Devector - create one

Helderiv - Helix derivative filter in 2-D

Helderiv < in.H helix=1 na=16 > out.H

Factors the laplacian operator. Applies helix derivative. Loops over n3

from history integer n1 , n2  
from par logical helix =1 if 0, apply the gradient filter on the 1st axis
  integer na =16 filter size (half the number of nonzero coefficients)
  real eps =0.001 zero frequency shift on the laplacian

Modules: helicon.lop , helderiv.r90


next up previous print clean
Next: Helicon - Helix convolution Up: SERGEY'S MAIN PROGRAM DOCS Previous: Devector - create one
Stanford Exploration Project
4/27/2004