Diameter Detection for Crystals Growth Based on Image Processing

According the diameter measurement of single crystal silicon in the growth process to put forward a diameter detection method that a circle defined by three points not in the same straight line. First, pretreat the growth image of single crystal silicon. Then, according the algorithm that a circle defined by three points not in the same straight line to extract the feature points, and the diameter pixel value of single crystal silicon accuratly detected. Finally transformed diameter pixel value into length value of the monocrystalline silicon rod through the measurement of diameter pixel value of draft tube. Tests show that error is very small between the test results and the true value, and meet the system requirements in a certain precision.