3D Acquisition
After a sensor system has been set up and is running, it is ready to start capturing 3D data.
3x00 series sensors are 3D snapshot sensors, meaning they capture an entire surface in 3D in a single snapshot. These sensors project several structured light patterns in a rapid sequence onto the target. The reflection of the pattern off the target is captured by two cameras. The target must remain stationary during the camera exposure of the light patterns. The required exposure time depends on the shape, color, and reflectiveness of the target, but is often shorter than 1 second.
A Structured Light Modulator (SLM) produces a sequence of high resolution/high contrast light patterns using a blue LED. Two cameras capture the reflected light pattern from different viewing angles. The sensor can then use either stereo correlation or independent triangulation to generate 3D points from the light pattern.
These are the steps of the acquisition of a 3D point cloud:
Step 1: Light pattern projected on target
Step 2: Reflected light captured by two cameras
Step 3: Use stereo correlation or independent triangulation to generate 3D point cloud
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