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Due to the improvement of modern scientific and technological level, the automation and production accuracy requirements are increasing in the industrial production process. The modern industrial production needs to use the automation and high measurement accuracy of non-contact measurement technology to replace the traditional, artificial, and low measurement accuracy of the measurement methods. By using the automated inspection, it has advantages of fast and accuracy, the traditional artificial inspection is limited by the detectors vision, physical and other congenital physical conditions. Thus, the quality and efficiency of the inspection are reduced and the reliability in the area of automated inspection is not good enough to be trusted. The machine vision inspection technology is widely applied in dimension measurement, flaw inspection, dynamic photography, etc. The major advantage of the vision inspection is it won’t damage devices under test during the measuring process. This thesis presented an inspection system for the flatness of cutting edges by image processing. The system is developed in C++ environment and built an X, Y, Z, and C four-axis PC-based control platform. We used the controller to obtain the machine coordinate and implemented the humanized functions of automatic and autofocus measurements, integrated as a machine vision inspection platform. The co-axis light source and an LED ring light with different angles were applied to solve the problem of insufficient lighting. The focusing characteristics and principles of CCD, and Sobel operator were utilized for calculating the gradient value to get the machine program coordinate. The human machine interface has a tutoring manner for users to operate the measuring procedures. The measurement functions can measure the diameter, helix angle, flatness of cutting edge, and other dimension measurements. Experimental results show that the measurement error is within 2.2% in comparison with the measurement instrument Zoller genius 3 and Olympus high-precision tool microscope. Therefore, the accuracy is reasonable for the proposed system which can be applied to measure the geometry of different cutting tools.
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