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.
Virtually all cameras need a lens of some kind to
collect the light that is scattered from the surface of
an object. The lens reconstructs this scattered light as
an image on a light sensitive area behind the lens,
normally a CCD or CMOS sensor.
Once you have selected the field of view you require, resolution and
image quality are the most important lens selection criteria. The lens
has to fit the resolution of the camera and the requirements of the
With a perfect lens, all rays of light from a single point on an object
plane will be focused to a single point on the image plane. Any lens
behaviour that stops this happening is classified as aberration.
The term 'dichroism' derives from the Greek and in physics refers to the
splitting of visible light into two colours when passing through crystals.
Dichroic filters are used for colour separation and are based on dielectric
Shortpass filters, Longpass filters, Neutral density filters, Daylight cut filters, UV cut filters and IR cut filters, UV/IR cut filters, Coloured filters
Filters can dramatically alter the character of the light that enters a lens
and they can have a wide variety of uses, from simple protection of the
lens surface to restricting certain wavelengths of light or polarising the