Stranica 167 [167]
cas A NI 7
19) The points are moved by left-clicking and dragging on the label. Move these to indicate
a pair of features on the standards which are recognisable in both images. Better
accuracy is achieved if these points as far apart as possible. Note that it is not essential
to use the standards themselves for the alignment (which may be difficult if, for example,
the image is quite dark), as long as these are correctly aligned in both images. Note that
the image will update in real time, which may cause a slight response delay in larger
images.
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Figure 3-69
20) To test the accuracy of the alignment, double left-click on the A2 “test_alignment”
thumbnail (Figure 3-70).
21) Scroll down to the VIS and UVL images to be calibrated (A3). These can be the same
as those in A2 (as shown in the above examples) or different images (as in Figure 3-71).
22) Double left-click on the A3 “reference” thumbnail to bring up the image view window
containing the VIS image and two points, A3.apl and A3.ap2. These should be
automatically placed in the same locations as for the D1 “reference” VIS image. Zoom in
or out of the image as necessary by pressing “+” or “-” (or “i” or “o”) respectively.
23) Move these to indicate a pair of features which are recognisable in both images. Better
accuracy is achieved if these points as far apart as possible. Note that the image will
update in real time, which may cause a Slight response delay in larger images.
Version No. 1.0 159 Date : 14/10/2013