Aiming at the problem of human instep 3D modeling, a new scheme that uses line-structured light scanning to reconstruct 3D model and measure parameters is presented. Line structure light photos are taken by 2 high resolution CMOS cameras from different angles. To get the point cloud data of instep, the scanning images are thinned by gray-gravity method and image coordinates is transformed to world coordinates. The least squares curve fitting algorithm is used to fix the blind data in human heel zone. And th...