In this paper

structured laser pointer (SLP) is proposed to sufficiently express the movement of user's hand.Firstly

the SLP is designed as input device

and then the corresponding signal processing application is programmed to filtrate the sequence of laser spots

and extract the trajectory of the laser spots and user gesture from the sequence.And the laser trajectory and user gesture are translated into original interactive language to increase the semantic interaction.Using a SLP can acquire a target quickly because the dwell of laser spots are not required.Instead

we search the plain section in the sequence of laser spots to quickly and accurately select the target that people want to point to.Finally

according to Fitts' law

a user study is designed that requires participants to achieve several tasks.It proved that SLP performs much better than traditional laser pen in speed

and using SLP can also express more semantic interaction.