A Virtual
Tape Measurer(VTM) is a system combining stereoscopic video
and stereoscopic graphics. The 3D coordinate of a feature
point in the stereo scopic viewing range can be recovered
based on the knowledge of the camera setup for stereoscopic
video. By obtaining the 3D coordinate of two or more points,
this system can be used as a tape measurer to measure the
distance in the space.
The
Accuracy
The measurement
accuracy of VTM depend on the camera setup, the designed working
range, and the object feature in the view. In one of our prototype
system, an error of 3mm has be reported with the measurement
range up to1m. A test on VTM for an Operating Microscope indicated
a bias of 0.3mm and an imprecision of 0.6 mm.
A detailed accuracy analysis is available on a
PAPER
: 3D MEASUREMENT IN ROV VIDEO INSPECTION
The
Applications
1.
Video-based inspection: VTM can be easily added onto the
existing video-based inspection system, to provide stereoscopic
inspection and accurate 3D distance measurement function.
2.Microscope surgery: VTM could be used with with an Operating
Microscope in surgery.
3. Accident recovery: VTM can be used in (vehicle) accident
recovery, where a stereoscopic video camera is used to record
the scene on site. The detailed 3D distance analysis could
carried out later based on the video recorded.
