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Various approaches to smoothing out the kinks:
The last two methods require some knowledge of the scale of the image features of interest and the scale of the displacements likely to be encountered. Both
vary considerably, not only between different types of image, but even within
pairs of images.
- Using landmarks: traditional technique, which tends to require manual intervention: ``Spots all look the same'' to the machine.
- Optical flow: good for smooth images and smooth flows, but rather
sensitive to these assumptions.
- Correlation: good general method which avoids assumptions in optical flow.