Research On Compressed Sensing 3D Imaging System Based On Phase Method Ranging

The non-scanning laser three-dimensional imaging technology is a new technology for acquiring three-dimensional information,and has the advantages of large measuring range,high imaging precision and fast three-dimensional imaging speed,and it is widely used in various three-dimensional measurement scenes.However,non-scanning laser 3D imaging also has problems such as low imaging resolution and large data processing.Until the emergence of the theory of compressed sensing,it provides a new three-dimensional imaging idea for non-scanning three-dimensional imaging technology-compressed sensing three-dimensional imaging.On the one hand,the compressed sensing technology can greatly reduce the number of measurements,thereby improving the measurement efficiency;on the other hand,it only needs to use a single-pixel detector to detect the optical signal,and the detection signal has a higher signal-to-noise ratio than the area detector.In this paper,the three-dimensional imaging system based on phase-based ranging is studied.Based on the single-pixel camera based on compressed sensing,combined with laser phase ranging technology,three-dimensional imaging of compressed sensing is realized.First of all,this paper introduces the principle of compressed sensing theory,including sparse representation of signal,measurement matrix and reconstruction algorithm.Then the basic principle and overall scheme of compressed sensing 3D imaging based on phase method ranging are expounded,and the mathematical model of the system is established.Secondly,according to the mathematical model,the numerical simulation of the compressed sensing 3D imaging system based on phase method is carried out in Matlab software.Through simulation experiments,the effects of different phase discrimination methods and compressed sensing parameters on the imaging results in phase method ranging are compared and analyzed.A synchronous demodulation method,a fast Fourier sparse transform base,a partial Hadamard matrix,and a minimum total variation are preferably used as experimental parameters.Thirdly,the key components(detectors,digital micro-mirror devices,etc.)in the compressed sensing 3D imaging system are selected,and the experimental platform of compressed sensing 3D imaging system based on phase method ranging is designed and built.The comparison experiments of sampling rate and target shape on imaging results are completed.The experimental results verify the feasibility and system effectiveness of the three-dimensional imaging principle of compressed sensing.