5.4. Tutorial: Surface modelling using projected patterns
Solution
If your object is plain you can use a standard digital projector to project a pattern onto the object and then take photos from multiple viewpoints relative to the projector. For example you can project a horizontal stripe pattern and take photos from a high-up and lower down viewpoint. The object will need to be placed on the calibration mat which should be visible in all the photos. You should be familiar with taking standard 3DSOM Pro shots before attempting using a projector approach.
Starting Point
Step 1
Take your photographs making sure that you have rotated the object to around 16 positions and have two (or more) images for each position. You will need to ensure that dots on the calibration mat are detectable in the photos - you may need to use a spot light to illuminate the mat. The projected pattern should be clearly visible and focused on the object — you may need to darken the room depending on your projector's power.
Step 2
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Step 3
Now build a point cloud by selecting the
button. You will need to select
either the "...using timestamp" option if the
images taken from both cameras were taken simultaneously (or
within a 0.5 seconds). Alternatively use the "...using trailing digits" option if the images have been named
with the same numerical suffix.
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Step 4
Select the masked images from the Thumbnail Window rejecting the other images and optimise
your surface using the masks and point cloud using
the 
button.
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