Structured light system is one of the common vision measurement systems. Its precision directionally affects it application

so error analysis is a key during designing system and calibration method. The paper proposed the error propagation model of structured light system about calibration method using the cross-ratio invariant; it is in the aspects of system measuring error and light-plane calibration. Those analyses were based on the error theory and matrix disturbance. According to the proposed error propagation model

the error analyses in a special condition were presented. It was the precision demand of calibration parameters and samples under the conditions of acquisition of ±0.5mm precision in the measuring distance of 1000mm. The experimental results validated those error analyses in the paper

and those would provide the principle basis for system designing.