Study & Application On 3-D Reconstruction Based On Image Sequence

3-D reconstruction based on image sequence is a new technology in recent that come from the combine of the technology of computer vision and computer graphics. According this technology, first we shot the scene from different angles use digital camera, then utilize the relation of epipolar geometry to estimate the exterior parameters (the position and direction) of cameras and to recover the scene in projective space, after this we use the technology of self-calibration to estimate the interior parameters of cameras and to recover the scene in Euclidean geometry.In this paper, the subjects of we discussed is focus on the technology of projective reconstructing and self-calibration that included in 3-D reconstruction based on image sequence. Projective reconstructing is the foundation of 3-D reconstruction based on image sequence. The aim of projective reconstructing is to estimate the position and direction of cameras through matching points in different images so lay the foundation for further reconstructing. On the basis of current methods of projective reconstructing, we used the Levenberg-Marquardt method to optimize the result of linear method so the precision is be improved, and we use the Bundle adjustment method to entirely optimize the structure of scene and projective matrixes.For recover the real structure of scene we should estimate the interior parameters of camera in further, and transform the structure of scene from projective space to Euclidean space, this process named camera calibrating. Often a reference object that position in space had been known is be needed in the traditional calibrating methods. This brings inconvenience in practice. Hence, many researchers have studied the methods of self-calibration. In this paper, we discussed the self-calibration method that no skew is present and the principal point is close to the center of the image but the focal length can be changed freely.China is an ancient civilized country with a long history. Chinese people have created abundant science and art civilization during its prolonged history process. It's an arduous task to protect all kinds of culture relics on the ground and underground. In this paper, we discussed the application of the technology of 3-D reconstruction based on image sequence in culture protecting. And we developed a simple system that reconstruct the model in Euclidean space. This laid the foundation for the technology of Image-Based Modeling to be used in culture protecting in further.At the end of this paper, the viewpoint and prospect to the future of this system are mentioned.