The first three photographs illustrate a technique to remove spurious information. The first photograph shows an intergranular crack originating from the surface of a sample of steel. In addition, there are a lot of distracting machining marks. The second image shows the Fourier transform of the photograph, with the information connected with the machining marks highlighted using arrows. This information was edited out of the Fourier transform and the image reconstructed. The reconstructed image no longer contains the original machining marks.

The unedited Fourier transform |
After slight editing, less than illustrated in the large micrographs above |
Reconstruction after the slight editing of the fourier transform |

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