I am new to this and am trying to implement Split Spectrum Processing (Delta-K processing) to ENVISAT ASAR coregistered images. Am using IDL for this, which is quite similar to MATLAB. Does anyone have some information on how to go about this as I am not able to understand the relation between the wavenumber, the Pixel number, pixel values and the spectral frequencies. I need to split the image into 2 sub bands, at slightly different center frequencies, producing two images. Has anybody here done this before?