RMS Average of Buffers

The purpose of this facility is to enable DigImage to produce full resolution averages of an ensemble of frames. The average is an RMS average relative to some user-specified zero point. In contrast [A Average of frames] produces a simple arithmetic mean average. The ensemble of frames may be obtained from different realisations of an experiment, or from different stages in the same experiment.

Average including what buffer ?

Any DigImage buffer may be included in the average, and each buffer may be included more than once if required.

Another buffer ? Answering yes (<Y>) allows a further buffer to be added to the list to average over, while no (<N>) indicates that all the required buffers have been added to the list.

Buffer to place average in ?

The average may be placed in an buffer, including one of the buffers which is included in the average list. This buffer is made the current output buffer during the averaging process.

Use what intensity as "zero" value ?

This entry specifies what intensity value the rms average is to be calculated around. The value specified here is subtracted from the intensity value before squaring and summing.

Average Window or whole Screen ?

The average may be computed of either a window within each frame buffer (<W>) or using the entire contents of each buffer (<S>).

Window Selection: Region to calculate average of

If the response to the previous question specifies a window to be used, the window selection submenu is produced (using the first buffer in the list) to allow the desired window to be selected. Additional information on the window selection process may be found in [H Help] within the submenu.

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DigImage User Documentation

Stuart Dalziel, last page update: 19 February 1996