| With the rapid development of society and science and technology,since humans are no longer satisfied with the acquisition of two-dimensional object information,the acquisition of three-dimensional object information is particularly important,so three-dimensional measurement technology is applied to all walks of life,especially in today's urgent need for high precision,Efficient manufacturing.Among the three-dimensional reconstruction technologies,structured light three-dimensional reconstruction technology and binocular stereo vision technology are important branches of computer three-dimensional reconstruction technology.Because of their advantages in measurement accuracy and high efficiency,they are widely used by the manufacturing industry.However,the binocular stereo vision 3D reconstruction technology affects the reconstruction accuracy of weak textures and repeated textures due to the difficulty of matching.The manufacturing accuracy and calibration accuracy of the projector limit the accuracy of the 3D reconstruction of structured light.Therefore,there is an important research to improve the reconstruction accuracy of both ignificance.This paper combines structured light technology with binocular stereo vision 3D reconstruction technology to avoid the calibration of the projector,uses structured light to increase the surface texture information of the object,and constructs a 3D reconstruction method based on binocular color structured light by phase matching.This paper mainly studies the structured light technology.Although the double N-step phase shift method can reduce the phase error caused by the non-sinusoidal nature of the system,it doubles the number of projected fringes and increases the image acquisition time of the camera.To solve this problem,this paper proposes a color double N-step phase shift method,which encodes the original phase shift stripes in blue and green colors to form a set of color stripe phase shift maps,and encodes the additional phase shift stripes in the same way Form a set of color phase shift fringe diagrams.The encoded color phase-shift fringes are projected,and the color fringe images collected by the camera are decoupled by color,and the wrapped phases are solved separately,and the two wrapped phases are fused to reduce the phase error.The twenty-step phase shift is compared with the color four-step phase shift and the color double four-step phase shift respectively as the ideal phase.The color double four-step phase shift is reduced by 39% relative to the color four-step phase shift phase rms error.Compared with the color double N-step phase shift method without color decoupling,the phase rms error of the proposed method is relatively reduced by 16%.Experimental results show that the proposed method can effectively reduce the phase error.This article first studies the three-dimensional reconstruction of binocular stereo vision,combs the theoretical knowledge of stereo vision,and leads to the principles and system flow of binocular structured light three-dimensional reconstruction.Secondly,the double N-step phase shift method is studied,and the color double N-step phase shift method is proposed.Step phase shift,non-color decoupling and color double N-step phase shift were used to make phase error experiments and analysis.Finally,based on the color double N-step phase shift proposed in this paper,an experimental platform was built to reconstruct the measurement block in three dimensions,evaluate the system accuracy and analyze the system error. |
