Research On 2-D Measurement For Small Rule Mechanical Parts Based On Machine Vision

With the character of non-contact, on-line and real-time, rapid, suitable precision and strong scene anti-jamming, the machine vision measurement technology has suited for the need of modern manufacturing progress and development. Combining machine vision with image processing technology, under the experimental condition on hand, this paper adopts basic dimension parameter of some normal parts (e g, bearing, serial terminal etc.) as studied object in manufacturing and develops the 2-D dimension research on machine vision system.Each chapter central contents are as follows:Firstly, this paper expounds the research background and significance of machine vision inspecting. Based on the development and applied status of machine vision measurement technology in manufacturing, the research aim and central task are introduced.Secondly, the basic makeup and work principle for machine vision measurement system has been introduced. The digital image processing technology as histogram Process, image filtering, sharpening, threshold segmentation, classical edge-detection, canny edge-detection and so on, has been discussed. Re-filtering for sharpening image is put forward to improve image outline result and the interesting regions technology can reduce the measurement difficulty.Thirdly, bearing and serial terminal dimension measurement systems have been designed by appropriate camera, lens, lamp-house, image collection card and other hardware instrument. Inspection board for serial terminal has been designed for fixing the position of measurement.Forthly, .this paper presents the method to extract and measurement beeline, singularity circle, double circles, corner and tangent point, triangle and polygon and so on. The application area of these methods and special corner points have been analyst and discussed. Circle preferences rules based on the improvement Hough transformation have been validated by experiment. The technique of sub-pixel edge orientation is an efficient method which uses software arithmetic to advance measure precision, so it plays an important roll in visual inspection.Finally, the paper develops corresponding software by Visual C++6.0 on the Window XP plate. Measurement result indicates the software can meet industrial measurement requirement. Calibration is a critical part of visual inspection. The paper uses standard specimen as reference objects to calibrate by relative calibrating method to make the calibration process fast and accurate.