Learn more about machine vision! In our knowledge base we are explaining key technical terms about image processing. We give you an overview to topics like 3D machine vision or the established standards like CameraLink, GigE Vision or GenICam.
Image vignetting and shading, Mechanical vignetting, Cos4 vignetting, Sensor shading
All images from lenses suffer from intensity decrease from the centre to
the edge of the image. As this can affect the suitability of a lens for an
application, it is necessary to examine the performance of a lens
concerning this behaviour, which is known as vignetting.
When designing a system, users often focus solely on the technology
required to make the acquisition work. A lot of time is spent diagnosing
why systems have intermittent failures and the answer is often to be
found in a lack of thought in the design of the interfacing hardware.
Back in the spring of 2003, the European Council passed the EU WEEE (Waste
Electrical and Electronic Equipment) Directive governing the recycling and
return of electrical and electronic equipment and the RoHS (Restriction of the
Use of Hazardous Substances) Directive designed to reduce the use of hazardous
substances. These two Directives took full effect on 1st July, 2006.
For machine vision use, CMOS sensors that feature a global shutter
enable sharp images of fast moving objects as all pixels are exposed
at the same time in the same way as progressive scan CCD sensors.
However not all CMOS sensors use Global shutters, some use a