The Key Technology Of Software For 3D Scanner

3D Modelling has deprived 2D Image processing and 2D graphic of attraction and has become the focus of people's attention for its particular predominance and its wide applications in industry, national defence, movie making, entertainment, culture relic conservation, virtual reality, visualization technology and so on. In this paper, studies on scanned data pre-filtering, model reconstruction, model simplification and interactive model modification are carried out.The significance of 3D technology and its developing status are presented in this paper. Advantages and disadvantages of some 3D digitizers and scanners available on market are listed according to our through research and comparison.An improved polygon approximation algorithm is put forward, which can extract feature points on curves steadily and more accurately for a given tolerance. The initial scanned 3D data can be simplified greatly using this algorithm, and that helps to reconstruct the model more quickly.The shortest-distance method is used to reconstruct 3D model and texture mapping is implemented to obtain more vivid model.A new 3D mesh simplification method is put forward. Triangle is shrunken to a vertex and triangles around the shrunken one are modified based on the calculation of volume error. It can simplify the original mesh greatly and provides efficient error management. Result of experiment is given.Interactive model modification is implemented to adjust the shape of model since error occurs while scanning. User can move the points and triangles to reshape the model. Adding,deleting and splitting triangles are also available to meet the need of model modification.We developed a 3D Laser Scan System, including the hardware and software. As the software is concerned, we use Microsoft Visual C++6.0 and OpenGL. Initial data filtering and simplification, model reconstruction, mesh simplification and interactive3D shape adjusting are the main functional parts to obtain a vivid model.