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With the rapid development of computer technology and photogrammetry, the binocular 3D measurement has been widely used in many fields such as quality inspection and reverse engineering. Depending on the application, there are different requirements for 3D measurement systems. Structured light image feature extraction is an important part of the binocular measurement system to achieve three-dimensional reconstruction. So, the paper puts forward a kind of approach for edge detection and edge tracking, using the edge tracking algorithm proposed by the paper to extract structured light stripes, and the method using chain code track record of the extracted features, and something useful is obtained.