Unshaking and refocusing your photos
Whether by wind, vibration, or shaky hand, we have all taken blurry photos. But in the digital era, there is no need to despair -- you can remove shake and blur from your pictures after the fact. Several Linux-friendly utilities can help you.
Deconvolution is the general process that helps remove the effects of camera shake and blur. If you want to understand the math behind the process, start with the articles referenced at Wikipedia and you can find as much detail as you want. In a nutshell, it involves taking the Fast Fourier Transform of the image (which makes it easier to see the tell-tale signs of blurring), smoothing out the artifacts, then transforming the image back into its original form. It is a CPU-intensive process, but for a shaky image there is no better use of your MHz.