LCOS Binocular Holographic Display Based On PYNQ

With the advancement of science and technology,people are increasingly demanding the form of visual display.As one of the most promising visual technologies in the near future,holographic display technology has attracted a large number of researchers to participate in the research of holographic technology.The rapid development of computer and optoelectronic technology has opened up a new field of technology for holographic technology.Computational holography has become a hot research direction in holographic technology,and how to obtain holographic images of three-dimensional objects more quickly and efficiently is the key research of computational holography.In the above background,based on the point source method computational holography,a holographic generation and reproduction system based on embedded image processing platform is designed.The system can calculate the holographic image of the stored three-dimensional model in a low-power environment,and drive the spatial light modulator to realize the reproduction of the binocular holographic image by means of video transmission.The main research contents of my thesis are as follows:In order to improve the deficiencies of the traditional point source method in holographic image generation,the optimization of the split lookup table S-LUT method and the WRP plane setting is introduced for the problem that the computation time of the point source method is too large.Through simulation,the new algorithm can greatly improve the efficiency of holographic calculation.In addition,a spatial correction transformation is performed on the original space model to adapt to the parallax of the two eyes.Secondly,based on the analysis of the system design goals,based on the idea of software and hardware collaborative design,the design of binocular holographic display system based on PYNQ is completed.In the overall design scheme,the PYNQ(Python productivity for Zynq)platform of ARM+FPGA heterogeneous processor is selected as the embedded development platform of the system,which can meet the dual requirements of the realization and acceleration of the computational holographic algorithm.On this basis,for the internal functional requirements of the binocular holographic computing system,combined with the analysis of the hardware resources of the PYNQ platform,the system functions are allocated reasonably.The logic part in the holographic calculation is distributed to the ARM processor,the algorithm accelerator and the video output controller are allocated to the FPGA,and the information exchange task between the heterogeneous processors is distributed to the DMA controller.Then,in order to improve the processing power of the holographic computing system,the subject has accelerated the design of the IP core.Using the twiddle factor and butterfly operation 9-stage pipeline processing mode,the FFT IP core is redesigned,and the custom IP is connected the AXI bus through the AXI4 protocol to realize data interaction.In addition,according to the goal of binocular holographic display,a binocular holographic reproduction optical path is designed on the optical platform with LCOS(Liquid Crystal on Silicon)as the core device to meet the experimental purpose of holographic image reproduction.Finally,this topic builds and configures the LCOS binocular holographic display system based on PYNQ,and carries out two parts of system testing.The system function and performance were tested in detail.It has been verified that the system achieves the expected performance indicators and meets the design requirements.