Image Processing Primer
Tue, 04/16/2013 - 03:53 pm
I am starting work on a new request to some image processing. Some of the features to identify are straight forward and I have done them many times with particle analysis. This time time in addition the request include analysis of periodic structures, i.e. do stripes appear in the image. My first response is to an FFT on the image and while I can handle the mechanics within Igor, I would like to better understand what the output means.
The objective: The images are taken from a Zygo microscope so height gets mapped to intensity. The question is "are there wave like structures in the image and if so what is there period (how far apart are they), how high are they (amplitude) and what part of the image are they occupying?"
I am using this page http://www.cs.unm.edu/~brayer/vision/fourier.html as a starting point of my education and while I can reproduce some the output within my test images not all. Is there a better reference to understand how to understand and quantify the results of an image fft. Also is there a better way to do this analysis?
Thanks in Advance