Tuesday 20 January 2009

Hey! Why do I have one extra batch?

Just had an interesting user query which caused some confusion but relates to a perfectly reasonable cause - a data set with N frames in it had N+1 batches in the Scala log file using the XDS/XSCALE processing. Cause is very simple - reflections which are measured on the last image but have a centroid on the "next" image which was not measured could get assigned to batch N+1 by pointless, during the reconstruction of the orientation matrix.

So, if you see this it is not really something wrong, just an artefact. As far as I can tell this made no difference to the quality of the data set.

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