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Figure 37
The Centroid and Peak Histogram windows now have horizontal and vertical plot scaling in units
of pixel, with histogram bins the size of a single pixel. Note also that we have the same plot
orientation as the LBA-PC beam window. In the Figure above we can see that most of the
centroids are falling 232
pixels from the left and 247 pixels from the bottom (assuming that your
origin is set to Window LL). In order to get this into real world units we would simply multiply
the pixel units by the pixel scale of the camera. In the example above the pixel scale, read form
the camera dialog was 13 microns per pixel. Thus the centoid would become roughly:
)(58.302413)(66.232 m
pixel
m
pixel
µ
µ
=
•
From the left (X)
)(4.322113)(80.247 m
pixel
m
pixel
µ
µ
=
•
From the bottom (Y)
The ellipses in the histogram windows have X and Y diameters two standard deviations wide and
tall respectively.
Operator’s Manual LBA-PC
Doc. No. 10654-001, Rev 4.10
91