Shape from Shading Technology

Die patentierten Shape-from-Shading-Technologie ermöglicht dem Anwender, aus der Schattierung von Oberflächen Informationen über die dreidimensionale Form eines Objektes zu gewinnen. Mit unserer trevista®-Produkten lassen sich alle Vorteile dieser Technologie effizient nutzen Das Verfahren eignet sich perfekt für die Prüfung von anspruchsvollen Oberflächen. 

What is "Shape from Shading"?

On a cloudy day, a snow-covered mountain looks like a single smooth surface, without contours or folds. Yet when the sun shines, shading effects are created that provide information about the mountain’s topography and give a precise impression of its elevations and depressions. trevista® has captured this light and shading effect and transformed it into an industrial imaging system. Four input images are used to calculate a range of result images: two topographic slope images in x and y direction, a curvature image invariant to
the orientation of the defect (produced by combining the
two slope images), and a texture image for evaluating surface reflectance. The result images delivered by trevista® can be combined in various ways to ensure reliable, flexible detection of a wide
range of defects.

Images – The Basis for All Successful Imaging Solutions : 

trevista® generates image information that enhances your inspection processes by adding substance and efficiency. The result images supply the image information – here based on the example of a coin – as topographic and reflectance information. Depending on the defect category, the channels can be examined singly or in combination during evaluation.


Topographic Information: Slope Images in x and y Direction 

These two slope images in x and y direction are ideally suited for detecting defects with a specific orientation, and shape deviations such as dents. Further slope images are optionally available, primarily designed to enable efficient inspection of all components with rotational symmetry.

Topographic Information: Curvature Image 

The curvature image is invariant in orientation and combines topographic information from the two slope images. The information it delivers is ideally suited for reliable detection and classification of even the smallest local defects of a few μm, such as scratches, impact marks etc. The algorithm features an integration function, used to generate a local depth image which enables local elevations and depressions to be detected in fractions of a second. 

Brightness Information: Texture Image 

Brightness properties of the surface are evaluated in the texture image so that defect characteristics such as discolorations and rust damages can be detected, too. 

Thanks to Shape from Shading, trevista® delivers meaningful result images that can be used individually or in combination for the evaluation. Click here to go to the trevista® product page.