Search Menu
Photonics Media Photonics Buyers' Guide Photonics Spectra BioPhotonics EuroPhotonics Vision Spectra Photonics Showcase Photonics ProdSpec Photonics Handbook
More News

Machine vision offers glossy quality control

Facebook Twitter LinkedIn Email Comments
Machine vision has been widely used for quality control of industrial processes, but glossy-surface inspection has only been possible manually. Now, a new quality control system can analyze all kinds of glossy, high-curvature or angular objects.

VTT Technical Research Center of Finland, working with Helmee Imaging, has enabled the quality control of complex, glossy objects such as bathroom faucets, tableware, cutlery and artificial joints through a new machine vision system.

Machine vision offers glossy quality controlThis machine vision prototype from Helmee Imaging allows for the quality control of glossy objects. Photo courtesy of Petri Lehtonen.

An object’s surface quality and 3-D shape are measured simultaneously through Helmee’s covered stereo phase measuring deflectometry method. Based on a combination of structured lighting and stereo imaging, the system measures how the surface distorts predetermined illumination patterns in place of traditional surface imaging.

Pattern projectors generate 80 million triangles onto the glossy object by bending and diffusing light rays through an optical dome while two cameras record the light’s behavior. Once the camera and projector dome points are known, the object’s surface point is found and the object’s properties can be calculated through an algorithm.

The system’s X-Y resolution is about 0.1 mm, and the Z resolution is ~1 µm, allowing the smallest surface defects to be seen.
Apr 2014
A precisely defined series of steps that describes how a computer performs a task.
The measure of departure from a flat surface, as applied to lenses; the reciprocal of radius. Applies to any surface, including lenses, mirrors and image surfaces.
The general term for the application of light to a subject. It should not be used in place of the specific quantity illuminance.
Electromagnetic radiation detectable by the eye, ranging in wavelength from about 400 to 750 nm. In photonic applications light can be considered to cover the nonvisible portion of the spectrum which includes the ultraviolet and the infrared.
machine vision
Interpretation of an image of an object or scene through the use of optical noncontact sensing mechanisms for the purpose of obtaining information and/or controlling machines or processes.
1. In optics, one of the exterior faces of an optical element. 2. The process of grinding or generating the face of an optical element.
3-DalgorithmangularbehaviorbendingcamerascoatingsConsumercurvaturedefectsdiffusingEuropeFinlandilluminationimagingindustrialindustryinspectionlightlight raysmachine visionmanualmaterialsmeasureopticspatternsprojectorqualityquality controlrecordSensors & Detectorsshapestereo imagingstructured lightingsurfaceTechnology NewsTest & MeasurementVTT Technical Research CenterEspooprocessesglossy surfaceobjectsHelmee Imagingcomplexbathroom mixerstablewarecutleryartificial jointscovered stereophase measuringdeflectometryCS-PMDdistortoptical domepointsX-Y resolutionlasers

Submit a Feature Article Submit a Press Release
Terms & Conditions Privacy Policy About Us Contact Us
Facebook Twitter Instagram LinkedIn YouTube RSS
©2019 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA,

Photonics Media, Laurin Publishing
x We deliver – right to your inbox. Subscribe FREE to our newsletters.
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.