THOR3D Calibry, User Manual

Page: 52 / 74

Deleting Bad Frames
In the context of the relevant example, it can be noted that the 3D model is
obtained even without the last group of frames which cause the splitting of
the leg. Therefore, all the frames starting from #4051 onward can simply be
deleted.
Highlight bad frames, right-click them and choose Delete in the drop-down
menu.
Project Fragmentation
In the example under our consideration, there are not many bad frames. We
have 4050 frames left for further postprocessing and have deleted at worse
around 400 frames.
However, in some cases divergencies in geometry can be fixed as early as in
the middle of a scanning session. For instance, some part of the model sur-
face in frames ##0–1000 has one spatial orientation, and in frames ##1001–
2000 – other orientation. When half of project frames are deleted there will be
insufficient raw data. In this case, you can try to divide the project into several
parts (perform fragmentation). Right-click the required frame and choose Di-
vide project in the drop-down menu. Then try to assemble the 3D model with
parts from several projects.
In the context of relevant example, it is possible to try to divide the project
into two parts: ##0–4050 and ##4051–4455. If splitting of the leg surface
was caused not by its movement but by inaccuracies in algorithm work
then, with a high likelihood ratio, the final 3D model will be correctly built
of two parts. If leg movement during scanning nonetheless took place,
then there is no need to divide the project into two parts as, with a high
likelihood ratio, the leg shape in frames ##0–4050 and ##4051–4455 will
differ.
Editing Frames
When one or more geometric frames are highlighted in the project tree the
tool bar appears on the right.
Highlighting brush. Move the marker over the cloud of points formed by
frames. The points affected by the tool are colored red. You can change mark-
er size by rotating the mouse wheel.
Polygonal lasso. The same as Highlighting brush, this is a selection tool. Only
the area of selection differs – it is determined by polygons where the shape
and size are chosen by the user.
Delete selected. When this button is pressed, all highlighted in frames and
red points will be deleted.
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