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16)
17)
18)
(c) Where the images used for calibration are not the same images to be calibrated,
either because it is a "twin" image not containing the standards (as in Figure 3-71)
or another frame taken with the same camera and lighting conditions. This may be
the situation if carrying out work in the field where site constraints may not allow the
standards to be easily included in the frame or if batch processing a number of
different frames taken with the same camera and lighting conditions.
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As with the previous workflow, alignment is carried out by selecting a pair of points in
each image. The corresponding UVL images are rotated and scaled according to the
position of these points in the corresponding images until these are aligned. The VIS
images in the “reference” thumbnails are automatically carried over from the “viscalib”
tab. The UVL images in the “adjust” thumbnails are carried over from the “linear” tab.
To align the Spectralon diffuse reflectance standards in the VIS and UVL images,
double left-click on the A2 “reference” thumbnail to bring up the image view window
containing the VIS image and two points, A2.apl and A2.ap2 (Figure 3-68). These
should be automatically placed in the same locations as for the D26 “reference” VIS
image. Zoom in or out of the image as necessary by pressing “+” or “-” (or “i” or “o”),
respectively.
Double left-click on the A2 “adjust” thumbnail to bring up the image view window
containing the corresponding UVL image (Figure 3-69). Move the points A2.bp1 and
A2.bp2 to the same locations as for the VIS image. It may be useful to have the image
view window containing the VIS image open simultaneously. If the image is too dark or
light, 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.
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