on 3D Digitization
3D imaging can benefit from advances in VLSI technology in order to accelerate
its deployment in many fields like visual communication and industrial automation.
High-resolution 3D images can be acquired using laser-based vision systems. With
this approach, the 3D information becomes relatively insensitive to background
illumination and surface texture. Complete images of visible surfaces that are
rather featureless to the human eye or a video camera can be generated. Intelligent
digitizers will be capable of measuring accurately and simultaneously colour and
Colour 3D Imaging Technology
Machine vision involves the analysis of the properties of the luminous flux
reflected or radiated by objects. To recover the geometrical structures of these
objects, either to recognize or to measure their dimension, two basic vision strategies
are available .
Passive vision, attempts
to analyze the structure of the scene under ambient light.  Stereoscopic vision
is a passive optical technique. The basic idea is that two or more digital images
are taken from known locations. The images are then processed to find the correlations
between them. As soon as matching points are identified, the geometry can be computed.
Active vision attempts to reduce the ambiguity of scene analysis by structuring
the way in which images are formed. Sensors that capitalize on active vision can
resolve most of the ambiguities found with two-dimensional imaging systems. Lidar
based or triangulation based laser range cameras are examples of active vision
technique. One digital 3D imaging system based on optical triangulation were developed
Sensors For 3D Imaging
The sensors used in the autosynchronized scanner include
Synchronization Circuit Based Upon Dual Photocells
This sensor ensures the stability and the repeatability of range measurements
in environment with varying temperature. Discrete implementations of the so-called
synchronization circuits have posed many problems in the past. A monolithic version
of an improved circuit has been built to alleviate those problems. 
Laser Spot Position Measurement Sensors
3D images can be acquired using laser-based vision systems. With this approach,
the 3D information becomes relatively insensitive to background illumination and
surface texture. Complete images of visible surfaces that are rather featureless
to the human eye or a video camera can be generated.
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