TECHNICAL DESCRIPTION
Visual inspection systems are based on the employment of pictures, both in the visible and infrared or ultraviolet spectrums. They can also make use of sonar images or adding structured light to the environment in order to analyze defects and shapes in products.
A Spanish research group has been working in inspection systems that use one or more cameras, together with the adequate illuminating systems to capture the necessary images. These pictures are then sent to a computer that processes the information to perform the classification according to the quality criteria and characteristics requested by the production process.
The figure shows an image obtained by means of a range camera that allows distinguishing an object by its depth. Thus, its position and defects can be determined through its volume.
The technology is totally developed and has been laboratory and field tested, although, it requires a particular specification for each case. The technology can be used for real-time inspection of production processes, both for the recognition and for the classification and quality inspection.
TECHNOLOGY ADVANTAGES AND INNOVATIVE ASPECTS
The main advantages of these techniques are:
• No direct contact.
• Constant quality in inspecting products.
• It only depends on the parameters fixed for a production process.
• If correctly designed, it allows a product quality inspection similar than a visual inspection carried out by an expert operator.
Meanwhile, the major innovative aspect of this technology is the use of advanced image processing techniques to obtain higher quality inspection systems. Thus, problems with brightness and shadows of images can be avoided.
CURRENT STATE OF DEVELOPMENT
Development phase (laboratory tested). The technology is ready and has been tested in laboratory and in various agreements with companies, but requires a particular specification for each productive case.
COLLABORATION SOUGHT
The research group is looking for companies interested in acquiring this technology for its commercial exploitation.
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