Stemmer goes 3D

22 June 2010

Stemmer Imaging has introduced 3D measurement tools in an effort to enhance the accuracy of three-dimensional measurements in industrial vision applications. CVB Metric 3D and CVB Merge 3D were chosen to allow accurate calibration of 3D images and to overcome potential problems in laser triangulation image acquisition, resulting from shadows in the laser line.

These new tools have been added to the 3D suite of tools in the latest version (10.2) of the Common Vision Blox (CVB) programming library, which fully supports all 32 Bit versions of Microsoft Windows 7.

CVB Metric 3D enables a 3D space to be calibrated by measuring a defined calibration object. Once calibrated, data point area or volume can be directly measured to sub pixel accuracy. To improve accuracy, the calibration can be made using the combined resultant image from CVB Merge 3D.

CVB Merge 3D is used in combination with multiple cameras to overcome systematic deficiencies in laser line triangulation and to make sure all flaws and defects will be detected during the inspection. Deficiencies in laser line triangulation arise when the surface structure of the object causes shadows in the laser line. This prevents extraction of local height information at these positions meaning that flaws at these positions cannot be detected.

Acquiring images from the same laser line using multiple cameras set at different angles produces images with shadows at different positions. CVB Merge 3D consolidates these different images into a single height image having a complete surface which will only lack height information if all the input images contain shadows at exactly the same place.

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