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Mathematically reconstructing the ambient stray radiation and subtracting it from the UVL
image
26) Click on the “uvistray” tab. This uses the Spectralon diffuse reflectance standards in the
UVL and corresponding VIS images to generate a mathematical reconstruction of the
ambient stray radiation present in the UVL image (for more details see Chapter 1).
27) The positions of the Spectralon diffuse reflectance standards in UVL image are
extracted from the alignments carried out in the “align” tab, as described above (Figure
3-72).
28) A matrix of values is created by subdividing the image into the number of standards
present (this should be automatically carried over as the number of standards entered
for the corresponding VIS image in the “markup” tab in the workflow for the correction of
VIS images) and determining the average X, Y and Z values for each of these (Figure
3-72).
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Figure 3-72
47) Double left-clicking on the “sample” thumbnail opens a window (C33.sample), which
aids in the visualisation of the areas being sampled to create this matrix of values. As
previously, a Slider is provided for adjustment to ensure that the areas sampled are
within the targets. Adjust as necessary for the available Spectralon diffuse reflectance
standards. Note that this should not be necessary if the position of the targets has not
moved significantly between frames and the alignment procedure was carried out in the
previous tab.
48) If the image is too dark and the targets cannot be seen clearly, click View > Toolbar and
check the “Display Control” box. This will bring up a slider which allows the brightness to
be adjusted. This change is purely for visual purposes and will not alter the data.
Version No. 1.0 161 Date : 14/10/2013