Selecting and correctly configuring the optimal illumination setup is one of the key factors when designing a vision system. Missing image information caused by incorrect illumination makes subsequent analysis much more difficult or even impossible, as no analysis algorithm can recover information that has never been captured.
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.
Acquisition technology has seen major changes in the last few years,
particularly with the adoption of new bus technologies. Traditional
frame grabber technology has been joined by a range of generic
interfaces such as FireWire and USB (2.0 and 3.0) along with Gigabit
The basis of all imaging software is the ability to acquire, transfer,
manipulate and interpret the pixel data output by a camera. What happens to
these images can vary from the relatively simple task of saving them to disk,
through to using them in a complex pattern recognition application.
When selecting a PC for an imaging application there are many factors
that need to considered in order to ensure that the solution chosen
delivers the performance needed, combined with both long-term
reliability and stability of supply.
Although not essential for all applications, calibrating a vision system is important if you are looking to extract data and make decisions based on measurements using real world units, such as for robot guidance.
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.
Intégrer un système de vision industrielle dans un processus de production pour en améliorer la qualité est souvent un défi énorme pour les industriels. Que le système soit complexe ou clé-en-main, avec des processus intégrés d’alignement, de rejet et de manipulation des produits, le recours à un intégrateur de systèmes de vision spécialisé est le plus souvent indispensable. STEMMER IMAGING s’associe régulièrement à des intégrateurs de systèmes et peut ainsi offrir un niveau de support sans précédent, allant de la fourniture de composants de vision jusqu'au développement d'une solution complète, prête à être intégrée sur la ligne de production.
CameraLink HS has a long history even though the standard itself is
young. With the ever increasing camera speeds "classic" CameraLink
standard is not able to scale easily beyond 850 MB/s, so another new
interface was needed to meet the needs of ever higher bandwidths at
the same or even lower cost.