In structured light system

coded pattern is the key of corresponding problem. Performances of coded pattern directly affect measuring accuracy and resolution. In the paper

an analysis of the maximum stripe deformation (due to depth changes on surface) and measuring resolution limits are discussed

the principle of spatial periodicity used for coding is proposed. Performances of measurement greatly improve with use of spatial periodicity in coding. When spatial periodicity is used for coding

the resolution is greatly improved

or the number of pattern is greatly reduced for real-time structured light systems. According to those analyses

a novel coded pattern based on spatial periodicity for real-time structured light system is presented

which is alternate time-space coded pattern. These coded patterns allow range scanning of moving objects with easy implementation of decoding and high measurement resolution. Experiments demonstrated the validity of spatial periodicity used in coded pattern design.