| With the rapid growth of people’s demand for information, single-channel video has been unable to meet the need of public. In city informatization construction, especially in the field of building control, intelligent transportation network, internet of things, television broadcasting and video conference, multi-channel video image Superimposed fusion technology has a wide range of application requirement.In view of multi-channel video image superimposed fusion, A hardware system based on FPGA is designed and implemented. The system receives video signal by DVI and VGA interfaces, and can use I2C bus configure video-capure chips and video output chip. After identiting the resolutions of the acquired signal, the separated two-way video signals can be scaled arbitrarily as well as superimposed in any position through the DDR2 module, scaling module, serial port and so on.At first, the thesis completes project argumentation by MATLAB, trading off the treatment efficiency and complexity of the algorithms, system’s scaling algorithm select bilinear interpolation. In addition, hardware platform required various chips are selected based on the system specifications, design method and part design schematics of hardware platform are provided. Secondly, key techniques of the system including I2C bus protocol, resolution recognition, DDR2 storage controller, implementation of bilinear interpolation algorithm,driving schedule generator of monitor, serial communication and superimposed fusion and all these techniques are designed and verified by Verilog HDL on ISE development platform.Finally, system software and hardware are joint debugged using step by step debugging method, all parts of system are debugged successfully and meet design specifications, which supports up to SD resolution(1280×1024).The system has characteristics of plug and play, high real time, low cost and strong flexibility. It uses modularity design concept, each module can be transplanted and called easily. The thesis has certain reference value to some related video design including video rotation, abnormal shape splicing, video long-distance transmission and so on. |
