Drawing in space:natural 3D free-form curve input method
空中手绘：一种三维自由曲线绘制方法*

This paper put forward a stereo vision based 3D free-form curve drawing method that greatly solve the conventional problem in the haptic-aided input device environment that user interaction is often hindered by connecting wires. Firstly, used stereo vision to track the drawing process of the designer and output a trajectory of 3D points. Secondly proposed B3 spline method of approaching curve to fit those 3D points. Experimental results show that the proposed method can capture the intention of the designer in an intuitive way and convert it into 3D curve rapidly.