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The grain in film images or speckle noise in digital cameras can perturb tracking somewhat. Use the Blur setting on the Filtering tab of the image preprocessor panel to slightly filter the image, minimizing the grain. This tactic can be effective for compression artifacts as well. (Use the blur setting, rather than matching blurs on luma and chroma.)
Tip: The filtering controls can be animated by turning on Make Keys.
There is also a Noise Reduce spinner, which controls a somewhat slower algorithm for noise reduction with less actual blur. It is intended to help tracking, rather than for producing ultra-clean final images. It avoids some operations in typical noise reduction algorithms that can shift the position of features in the image.
SynthEyes can stabilize the images, re-size them, or correct for lens distortion.
As it does that, it interpolates between the existing pixels. There are several interpolation modes available. You can produce a sharper image when you are re- sampling using the more advanced modes, but you increase the grain as you do so.
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