Design Of FPGA-based Stereo Display System

With the advancement of medical display technology,medical endoscopic camera systems have been developed from the mainstream 2D(Two Dimensions)display to 3D(Three Dimensions)display,and the image clarity is also from HD(High Definition,HD)to UHD(Ultra High Definition,UHD)transformation.However,most 3D endoscope systems use assisted 3D display technology,which can not avoid the dizziness,eye fatigue and other discomfort caused by wearing 3D glasses for a long time.Therefore,medical naked-eye 3D displays have been introduced.The project designed and developed the matching problem between the mainstream 3D endoscopic camera host and the high-definition medical naked-eye 3D display video interface on the market,combined with the advantages of FPGA(Field Programmable Gate Array)hardware parallel processing.The stereoscopic display system based on FPGA promotes the popularization and application of naked-eye 3D display technology in the medical field.Firstly,dual-channel 3G-SDI stereo image acquisition was implemented using the SMPTE core provided by Xilinx software.Considering the requirements of the image processing part for the image transmission format,the acquired stereo image is subjected to YUV to RGB format conversion.Secondly,image processing is performed using a VPSS(Video Processing Subsystem)core provided by Xilinx.In order to solve the problem of matching between high-speed image data bandwidth and DDR3 memory bandwidth,a DDR3(DDR,Double Data Rate)read/write control scheme is designed and optimized to provide an important guarantee for high-speed image buffer processing.Finally,through the SBS(Side by Side)splicing method,the video that satisfies the stereo image output format is output through the stereo display;meanwhile,the logic verification,online simulation and feasibility verification of the overall design scheme are performed on the FPGA hardware platform,and The consumption of logical resources and the power consumption of the system are analyzed.The stereoscopic display system outputs from the front end stereo image to the output of the back stereo image,and the image needs to be subjected to multiple processes such as scaling,buffering,synchronization,and splicing.At the same time,this paper elaborates on the hardware peripheral circuit modules,the stack structure of the hardware boards,the layout of components,the impedance matching of important signal lines and the routing specifications.The experimental results show that the hardware system with 10-layer PCB design can support two 1920×1080@60Hz image input and 3840×2160@60Hz stereo image output.The video stream is input from the 3G SDI video interface,and is subjected to multiple processes such as format conversion,scaling,buffering,synchronization,and splicing,and is output through the DP 1.2 video interface,wherein the image storage module involves an image read/write data bandwidth of approximately 31.852 Gbps/s.The output stereoscopic video can be displayed directly on the naked eye stereo display.The LUT(Look Up Table)resource consumed by the system only accounts for 26.04% of the total FPGA resources,the output image data bandwidth is as high as 23.76 Gbps/s,and the FPGA on-chip power consumption is only 4.598 W.The FPGA-based stereoscopic display system designed in this paper completes the conversion and matching of the mainstream 3D endoscopic camera host and the existing naked-eye 3D display video interface,and the system has great advantages in high performance and low power consumption.At the same time,the stereoscopic display system has made the naked-eye 3D technology a new step in the field of medical ultra-high-definition stereo display,providing a practical design solution for high-definition 3D display and high-speed video processing.The system is expected to enable medical teaching.Further developments have been made in areas such as consultations and stereoscopic operating rooms.