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Figure 9
An example of image registration. (a) Image taken at time 0 (2–4 h after setup) clearly showing precipitant. (b) Drop after one week; four crystals are apparent in the precipitant. (c) Images (a) and (b) registered, maximizing correlation coefficient to 75%, subtracted and scaled using a local scaling algorithm with a box size of 15 pixels. (d) Edges detected using image (b). (e) Edges detected using image (c), showing the increase in the signal to noise after image subtraction takes place.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 58| Part 11| October 2002| Pages 1915-1923
doi:10.1107/S0907444902016840
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