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NEWS@IMAGING

Always one step ahead

New Software Tools For 3D Measurement

17 May 2010

New 3D measurement tools from STEMMER IMAGING enhance the accuracy of three dimensional measurements in industrial vision applications. CVB Metric 3D and CVB Merge 3D have been introduced 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.

Most common 3D acquisition technologies do not provide a calibrated image. Although many 3D applications can work reliably with non-calibrated images, calibration is essential for some applications. 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 any systematic deficiency 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.

STEMMER IMAGING Sales & Marketing Director, Mark Williamson, said: "These new tools have been introduced as a direct result of working closely with customers to solve their real 3D measurement problems. Our considerable experience in this field has taught us that the biggest source of errors in measurement arises from variations in hardware, including distortion from the optical system. As Europe’s largest independent supplier of vision technology, we highly recommend that customers contact us early on in these applications so that we can help specify the best configuration to deliver the required accuracy".