Single-shot Structured Light Field 3D Imaging

Light field 3D reconstruction technology has great research significance and wide application prospects in industrial production,biomedicine,artificial intelligence and other fields.Fringe projection profilometry has become one of the representative technologies of structured light field 3D reconstruction due to its advantages of non-contact,simple system,high measurement accuracy and fast speed.The traditional structured light field 3D reconstruction uses industrial cameras to collect the deformed striped structure light field.When the industrial camera collects the light field,it is necessary to accurately design the camera parameters and adjust the focus mechanically,and the depth of the captured picture is small.If the focus is not accurate,it will cause errors in the reconstruction results.In response to this problem,this paper proposes a method of imaging using a light field camera,and then combining digital focusing technology to collect the light field,and only requires a single shot to achieve 3D reconstruction without focusing.Compared with traditional industrial cameras,light field cameras have lower cost and do not require mechanical focusing.Using computational imaging methods,the focus is more accurate.After digital focusing,a larger depth of field can be obtained,that is,the clear range is larger.This paper first briefly introduces the significance of 3D reconstruction technology research,as well as several typical 3D reconstruction methods and analyzes the advantages and disadvantages of these methods.Afterwards,for the imaging problem of industrial cameras,a 3D reconstruction method based on single shot structured light field was proposed.The digital focusing technology was introduced into the 3D reconstruction,and then the research was carried out on this basis.This paper focuses on the principle of digital focusing of light field cameras,and uses the sharpness evaluation function to locate the accurate light field pictures.This paper also details the principle of fringe analysis using Fourier transform profilometry and the possible errors in the processing.In-depth research on the phase unwrapping problem in 3D reconstruction is carried out,and several typical phase unwrapping algorithms are summarized and compared.After computer simulation and specific experiments,the results show that even in the case of inaccurate focusing of the collected light field,the method proposed in this article can also reconstruct the 3D shape of the object.