Research On Single Pixel 3D Imaging Technology Based On Fringe Projection

Traditional two-dimensional detection imaging is the most common way to retain scene information.But this detection method loses depth information,unable to get the true distance of scene objects.The three-dimensional measurement technology developed on the basis of two-dimensional detection imaging has effectively made up for this deficiency.The characteristics of 3D measurement technology to obtain height distance information make it play a huge role in various industries.As an emerging imaging method,single-pixel imaging is a computational correlation imaging method.It has good imaging capabilities in extremely low light and wide-band imaging methods.The optical three-dimensional measurement method combined with single-pixel imaging provides a new application idea for three-dimensional measurement technology.This thesis introduces the main classification and basic principles of optical 3D imaging technology.Then,the focus is on the three-dimensional measurement method based on fringe projection profilometry.Fourier fringe profilometry and phase shift phase measurement are the most representative measurement methods in this technology.After the discussion of single-pixel imaging three-dimensional measurement technology,this thesis introduces the three-dimensional measurement method combining fringe projection profilometry and single-pixel imaging from both theoretical and practical aspects,and respectively completes the single-pixel three-dimensional reconstruction based on Fourier fringe profilometry and phase-shifting phase measurement.The article proves the advantages of single-pixel 3D imaging technology in wide-spectrum imaging,and analyzes the accuracy and stability of technical measurement.Then,this thesis introduces the experiment of infrared single-pixel 3D reconstruction based on Fourier fringe profilometry(FFT).Active scanning imaging using near-infrared light source to obtain high signal-to-noise ratio two-dimensional fringe modulation intensity map.Using the phase extraction method of Fourier fringe profilometry to obtain the wrapped phase,then using phase unwrapping algorithm to obtain absolute phase.In order to obtain the conversion model from absolute phase to real height distance information,a mapping relationship from the camera coordinate system to the world coordinate system is established.So that the depth information distribution in the scene can be obtained,and a highly robust infrared single-pixel 3D measurement system model is realized.This thesis introduces the single-pixel 3D measurement method based on phase shift phase measurement(PPM).Among the classic three-dimensional measurement methods,phase-shifted phase measurement profilometry has the advantages of high precision and high stability,which to a certain extent makes up for the shortcomings of low single-pixel imaging resolution.In the experiment,the phase shift phase measurement method was used to complete the conversion process from the detection of the two-dimensional intensity map to the absolute phase.Approximately the parallel projection phase height mapping model,and the checkerboard calibration method are adopted to complete the conversion of the true distance.Through the three-dimensional measurement of the etalon,the measurement accuracy and error of the system are analyzed.Finally,the deficiencies that limit the accuracy of the system are discussed.this thesis combines phase measurement profilometry based on fringe projection with single-pixel imaging technology to broaden the realization methods of single-pixel three-dimensional imaging.The single-pixel 3D reconstruction method based on FFP verifies the imaging capability of single-pixel 3D imaging technology in special wavelength bands.This method provides a new way for low-cost wide-band 3D applications.In addition,the PPM technique is applied to single-pixel 3D imaging for the first time,realizing a high-precision and stable single-pixel 3D measurement method.