3rdTech DeltaSphere-3000 User Manual page 81

you'll be prompted to choose a file to align to. Select the range file you copied (in our sample
data, v1_color.rtpi) and click OK.
You'll then be prompted for an image file to align. Choose one of the image files (im09-1.tif in
the sample data). SceneVision will open these two windows. It will also create a
correspondence group in the scene file. Finally, it will select the Create Correspondence Point
(
Select Correspondence Points
Select corresponding points in the two windows to create a mapping of the image file to the
range data. The process is the same as described for aligning range.
Hold Ctrl, the cursor changes to a cross, and select a point in either the range or image window.
Then, find the corresponding point in the other window and select it in the same way. You can
select in either window first, and you can change the order for future selections – but you must
complete a pair before selecting the next point. Figure 54 shows correspondence points selected
in our sample data. The points will appear in the scene tree – and can be moved or deleted as
with any other points.
In addition, when a correspondence point is selected it can be moved up, down, left or right
using the keyboard's arrow keys. This provides very precise control over point selection.
DeltaSphere-3000 3D Scene Digitizer
) button, in preparation for the next step.
Note: You may want to 'tile' the two windows for the next steps.
Figure 54 Color alignment correspondence points
Note: In range alignment the correspondence points chosen are only used as
starting points for the alignment procedure. In color alignment, the points chosen
determine the mapping.
correspondence points should be selected very carefully by 'zooming in' to the
data as necessary. Look for points that are easy to identify – corners or centers of
Therefore, to produce
80
accurate mappings,
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