关键词: 特征跟踪, 卡尔曼滤波器, 区域变形, 三维重建

Abstract: Three-dimensional reconstruction of crack defects is achieved by tracking the crack region in the serial sections of the image.The process is divided into the following three steps：the regional prediction，regional deformation and surface rendering.Prediction is intended to estimate the region of following slice images based on the current image.It can get the actual region through region morphing due to the difference between the predicted region and the actual region.The region is applied surface rendering to complete the three-dimensional reconstruction.The need for explicit correspondence analysis between crack regions extracted independently in successive CT image slices is thus averted.The method is low cost，and thus facilitates interactive feature selection.The result shows that the crack region can be tracked and reconstructed quickly.

Key words: feature-based tracking, Kalman filter, region morphing, three-dimentional reconstruction