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.
Telecentric lenses are designed specifically for use in specialist measurement
applications where per-spective projections and incorrect image scaling can
cause problems. They are particularly suited to i-maging 3D objects where
scaling can often be misinterpreted.
The principle of measurement is again based on triangulation in a
similar way to laser profiling, however, the whole surface of the sample
is acquired at once by projecting a stripe pattern to the surface, typically
at an angle of 30°, and recording the resulting image by a camera
perpendicular to the surface. A speciality is the exploitation of grey level
slopes at the stripe edges, as indicated in the following image:
Thresholding is used after pre-processing of digital images to group pixels
and thus accentuate particular elements of the image. Thresholding algorithms
are based on individual pixels (in contrast to edge or texture based methods
for example ).
To achieve the best image consistently the camera exposure should
happen exactly when the object is in the correct position. Initiating the
start of an exposure at a particular time is called asynchronous reset or
Panel design and manufacture has become a lot more complex with modern day cars, the sheets undergo greater stresses during formation and the surface is made up of many more layers with a lot more choice in colours. As these increase, the need for automated inspection does as well. In this article we cover some of the defects encountered and a few of the ways they can be inspected using machine vision.