Keywords component identification, vision systems, inspection
Start Date: 01-DEC-90 / Duration: 30 months
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The objective of this project was to develop an integrated, flexible and robust CIM vision system. It is optimised as an entire system rather than optimizing the individual system components alone. The vision system is designed for performing quality assurance inspections in an industrial concrete tile fabrication environment.
Novel optical components, sensor architecture and processing electronics, incorporating recent progress in the field such as e.g. random access to the region of interest, have been realized. The zoom lens is digitally controlled and has an appropriate tiltable mirror in front in order to move the optical axes. The computation time is reduced by an optical implementation of the Gaussian convolution with a diffractive element, i.e. a computer-generated hologram. The latter is electrically switchable based on liquid crystal technology. A special developed novel dynamic image sensor offers random access of pixels, selectable exposure time and frame rate, as well as programmable image resolution through on-chip charge summation capabilities. Communication with the CIM environment is ensured with bidirectional lines with TTL levels, available on the CIVIS optocontroller card, and standard interfaces such as RS-232 and Ethernet adapters.
The integrated approach adopted involved a careful adaptation of the submodules to each other. Some of the image pre-processing steps is done in the optical domain and on the sensor chip in order to achieve optimum performance. The system realizes active vision by responding to changing situations by a laboratory test-bed, simulating closely the industrial environment.
Although the demonstration of the CIVIS system was in the field of surface inspection of concrete tiles, its potential for robotics applications has also been investigated.
Prof Dr Cor Claeys
B - 3001 LEUVEN
tel: + 32/ 16-281-328
fax: + 32/ 16-281-214
IMEC - B - C
I2S-SA - F - P
ADEC ROBOT AG - CH - P
KRONIMUS AG - D - P
PSIZ - CH - P
OPTEC SRI - I - P
IPA-FRAUNHOFER GESELLSCHAFT - D - P
CIVIS - 5194, December 1993
please address enquiries to the ESPRIT Information Desk
html version of synopsis by Nick Cook