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Based on the development of 3D scanning technology in the near future, as well as on the urgent needs of the subject characteristics of effective extraction, through the method of camera and projector measurement system and calculation, using the discrete 3D reconstruction algorithm and standard algorithm are analyzed in detail, as the key technology of 3D scanning system, and further to the 3D coordinates of repeat the calculation process, the practice research and calculation, demonstrates the 3D scanner prototype system of projection light encoding technology based on object feature extraction in effective and discrete points in 3D reconstruction can be used efficiently; at the same time, the use of standardized operation, focal length reverse angle deformation calculation, reverse distortion calculation of three methods, comprehensive discussion the content related to the object feature extraction and effective discrete point reconstruction process, the prototype system to the real cultural relics sweep test.The prototype system can be used for different materials, different kinds of objects, and can effectively carry out the research results of digital object recognition.