Reduction and hole-repairing of 3D scan line point clouds based on the portable body measurement system

Scan line point clouds can be generated using the portable body measurement system. Because of high-density points located in the scan line, reduction becomes a necessary task in processing. After analyzed, the width decision method is adopted and the reduction effect relies on the value of T, when T=0.008D, the number of points is reduced to 42%. Meanwhile, due to occlusions, holes exist in the scan line of the body. To fill the holes, a new approach is proposed which is based on the spatial gray model. Firstly, the chord length is selected to be the threshold to determinate holes, then according to the principle of spatial gray model, SGM (1, 1) of the scan lines are established which help to complete hole-repairing successfully.