# FFT Filtering

> Here is one of the nifty things you may use fft filtering for. The laser scanning confocal microscope scans along the X axis. If there is noise in the laser, then this shows up most dramatically in adjacent X axis scans. Filtering the frequency of the alternating X axis intensities cleans up the image.

> Gilles Carpentier extracted the orginal 256x256 image from this composite image and attempted to reproduce the results. He also provides several macros for removing horizontal streaks.

> The Image Processing Toolkit also does this in Photoshop.

> Example contributed by Michael Cammer, Analytical Imaging Facility, Albert Einstein College of Medicine.

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