CVB Tools Enhance Accuracy Of 3D Measurements

New 3D measurement tools from Stemmer Imaging are designed to enhance the accuracy of 3D measurements in industrial vision applications. CVB Metric 3D and CVB Merge 3D enable the accurate calibration of 3D images and overcome potential problems in laser triangulation image acquisition resulting from shadows in the laser line, according to the company. 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.

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 the 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 that will only lack height information if all the input images contain shadows at exactly the same place.

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