I have a dataset with two columns (width and length, both in milimeter). When I make a scatter plot (please refer to the first figure), I see location of defects in a plane. I want to find if the location of the defect has some kind of pattern or it is just a noise. For that I was suggested to use 2D fft to recognize pattern. I don't have any background in 2D fft but I read some articles and used matlab function fft2. I get a plot (please refer to the second figure) which I dont I understand so much at this moment. Can any one has hint to get me going? A nice article could also be of help. I read the following article as well.
Thanks in advance!