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The stability of the production process and whose control technologies, is one of the major topics for the quality of the product. Therefore fast measurement technique plays an important role. One of the best ways, depending on the application and the required accuracy, is an inline measurement system. The optical quality control of springs is one of many applications for inline measurement. For the quality control of springs fast two-dimensional image processing technologies are well suited. In combination with the methods of quality assurance a powerful inline measurement is possible. In the application presented in this paper for a production process of springs a small quality control loop is used. The novel approach in this application is that the ranges of the quality control chart directly controls the spring forming process. Therefore an upper warning limit and a lower warning limit were defined. Also an upper action limit and a lower action limit were to be used for the control of the process. The second focus in the paper lies on the realization of an image processing system. It is divided in Software and Hardware solution.

Within the field of industrial image processing the use of colour cameras becomes ever more common. Increasingly the established black and white cameras are replaced by economical single-chip colour cameras with Bayer pattern. The use of the additional colour information is particularly important for recognition or inspection. Become interesting however also for the geometric metrology, if measuring tasks can be solved more robust or more exactly. However only few suitable algorithms are available, in order to detect edges with the necessary precision. All attempts require however additional computation expenditure. On the basis of a new filter for edge detection in colour images with subpixel precision, the implementation on a pre-processing hardware platform is presented. Hardware implemented filters offer the advantage that they can be used easily with existing measuring software, since after the filtering a single channel image is present, which unites the information of all colour channels. Advanced field programmable gate arrays represent an ideal platform for the parallel processing of multiple channels. The effective implementation presupposes however a high programming expenditure. On the example of the colour filter implementation, arising problems are analyzed and the chosen solution method is presented.