Hough Transform

I was doing some research on de-skew a image, and found this page about Hough Transform A interesting read, and the idea is very simple and easy to use. It is very interesting as how presenting data in a different way will lead to a much easier understanding of it. The other example I can think of is Fourier Transform, I have done multiple applications that requires FFT, and it do wonders to some instances. A note about FFT is the 2D FFT. I remember had the question about if doing vertical FFT on a FFTed graph make sense, but since I was a bad student (always want to play games first) never asked this question. Think back, the way 2d FFT is performed makes no sense, but since it does present a usable solution (for compression etc) we are just doing it :-)