Gray code-phase shift combined structured light measurement form is a commonly used three-dimensional（3 D）measurement technology.In actual application process

Gray code and phase-shifting decoding results often have a phenomenon in which the period is not strictly consistent

this phenomenon is called period dislocation.This phenomenon will results in decoding result will not being able to achieve the purpose of continuous single-valued measurement space division of the target image

thereby affecting the accuracy of point cloud matching.Above all

a new method based on image morphology is proposed for this phenomenon.The Gray code result image is processed by corresponding expansion

erosion and convolution.The final gray code period will remain with the phase-shifting decoding period

and the absolute phase deviation will be eliminated.Secondly

a binocular structured light measurement system is built for the proposed correction method.The point cloud reconstruction experiment of the 3 D solid model is completed.The effectiveness and reliability of the method is verified by comparing the uncorrected results and the corrected results.