Image Composition Development

To get the best performance of a vision inspection system the best image composition is necessary.
Therefore an investigation of the best illumination and optics is required. Of course, not every problem requires extensive investigation. In practice many standard techniques are used and are common within the vision world.

Illumination is the key

A lot of image solutions are based on a camera (digital or analog with frame grabber) and a back light. For a lot of inspections or measurements this is the easiest way to create a robust image of the feature you want to detect or measure. In case you need a higher performance extra attention is required. To detect small parts or details you need a high measurement accuracy, the Modulation Transfer Function of the used optics are getting more and more important. Also the homogeneity and the wavelength (colour) of the back light is getting more and more important.
A few standard light sources The distortion of the optics (lens) is getting more and more important. For what case do you take a telecentric lens and in which situation could you better take telecentric illumination.
Even the implementation of a detection algorithms e.g. edge detection is important to get the best performance. For many inspection problems a back light is not sufficient and a front light or several illuminations on different positions are required.
In all cases, it is important to get the best contrast of the to inspected feature. Vision inspection is primarily based on local contrast and the best and robust solutions are received in those cases with the best local contrast.
To create this best local contrast and get rid of environment disturbances a lot of standard illumination techniques and light sources with different wave length (colour) are available on the market. Techniques as Co-axial, cloudy sky (diffuse dome light) direct light (bright and dark field) and structures light are common.
It is not always possible to select the best illumination for a specific problem beforehand. The first selection is mostly based on experience and often an thorough investigation gives the best result. Therefore a laboratory and all kinds of illumination are required to do a profound investigation.

Luxeon RBW line Luxeon ring light Triple ring light Multiple foil light Luxeon leds Luminescent line

In-house laboratory

JAIMS offers an in house laboratory with a variety of illumination and optics.
A lot of standard led light sources e.g. back light (area), ring light, line light, coaxial and spot light are available. Almost all applications are solved with led illumination, in cases this is not possible JAIMS uses other kind of light sources e.g. black light, UV or lasers.
Laser line projection JAIMS works in close harmony with several suppliers, in which case a specific light source is available very fast if not on stock.
If a standard solution is not satisfactorily, JAIMS develops a special illuminations, particularly designed for this case.
To realize this, a diverse range op leds are available; power leds e.g. Lumiled (luxeon) star, line and ring in all kind of colours and power, with and without lenses, lambertian, batwing and side emitting leds. Lumiled superflux, red and blue spotlight, flexible linear light, LCD back light, electroluminescent foil, laser and special triple ring light are also available.
Because JAIMS works close with several suppliers own designed special light sources evaluate to a more common design which come available on the market.

From standard lens to complex optic systems

A few lenses The common way to create an images on the camera is to use a standard TV lens.
A lot of lens types are available on the market with different quality and different uses. Of course not all kind of lenses are available in the in-house laboratory but the most common types are on the shelf. Even telecentric lenses and different kind of microscopic objectives. Via the same JAIMS network almost every lens type can be obtained for investigation or feasibility study.

Another major competence of JAIMS is to build special imaging setups. To create special imaging setups, we make use of optic building systems from Linos, Owis and Newport.
In our laboratory it is possible to create complex optic systems as multiple camera-single optics, split images and microscopic images. So the most strangely optics creation for machine vision can be made.

Linos multiple cam test setup A few Linos projects
When the best optic setup is determined JAIMS has the possibility to create an industrial and robust version of this setup. For prototyping a Tube mounting system from Linos is available. For more then one prototype JAIMS uses a toolshop to create inexpensive optic systems.

The quality of a vision solution for product quality inspection dependents for 80% of the image quality.