System Design For Transmitting 3D Video Over Wireless Network Based On FPGA

With the gradual maturity of WiFi technology as well as the generalization and miniaturization of intelligent products, 3D display technology can also be applied in the display of small screens. Based on FPGA, this paper has presented a kind of wireless WiFi transmission system design of 3D videos, which can be used in both common display and mobile phone display terminal. With the signals collected by two-way cameras as the input source and the FPGA chip of Cyclone IV series of Altera company as the processing core, the data acquisition and stitching of Left-right video required by 3D display can be completed in real time. Subsequently, with the special 3D video glasses as a viewing unit, the system can achieve realistic 3D video images on mobile phone. Simple construction, stable performance and sharp images allow the system to be satisfactorily applied in video surveillance, medical monitoring,outdoor advertising, casual games and DIY production of 3D videos.The main content of this paper includes the following points: The paper discusses the idea of linear interpolation algorithms, the selection of WiFi chips and the design of WiFi module. Conducting video collection and data processing through FPGA, the paper designs the wireless transmission systems of monocular camera,dual cameras and SBS video images. Finally, this paper compares the image quality by the subjective and objective evaluations of 3D video images.(1) The paper provides an overview of the theory and classification of 3D display technology as well as the development of Wi Fi technology and expounds the basic theories including the theory of human stereo vision, color space model, the video signal standards, BT.656 video streaming and video resolution scaling. Based on the generalization of current wireless WiFi technology and the portability of mobile phones, the paper eventually determines the design scheme of this system.(2)After comparing several common image scaling algorithm and balancing the factors such as the complexity of the algorithm, scaling effect and logical resource ofFPGA, this paper chooses the modified bilinear interpolation algorithm to realize image scaling.(3) With the Verilog HDL, the paper designs a real-time processing system of two-way digital video signals, which including video collection, decoding module, frame buffer control module, deinterlacing module, resolution conversion module, color space conversion, I2C&SPI configuration module and output sequential control, etc. And the system is verified on the simulation software platform of Modelsim and Quartus II. Consequently, the video collection and video data processing of FPGA is completed.(4) By the selection and analysis of WiFi chips, the paper finally determines the hardware design of WiFi module. Considering the portability, in order to minimize the area of the PCB board, this paper presents the detailed hardware design schematics and analyzes the whole WiFi hardware system.(5) The paper analyzes the 3D display theory of Left-right video and completes the monocular camera wireless transmission system and dual cameras wireless transmission system through the development platform constructed by FPGA. After debugging, the system achieves a good 3D visual effect.(6) The 3D video images are compared through the subjective and objective evaluations.The paper proposes to adopt the standard double stimulate continuous quality classification method(DSCQS) for the subjective evaluation and SSIM(structural similarity) for the objective evaluation to measure the quality of the stereo images.