However the team discovered that eyes can be too quick to be captured by camera for an accurate positioning function.
但该团队发现眼球运动过快，相机难以捕捉其运动状况，无法实现精确定位功能。
2
Camerapositioning is a classical problem.
相机空间定位是一个经典问题。
3
Other examples of direct manipulation are the resizing of a graphic object in a drawing application and the positioning of an object or camera view in a three-dimensional scene.