Design And Implementation Of Image Capture And Processing System Based On FPGA

With rapid development of the science and technology,digital image processing technology is developing very fast.As FPGA technology becomes mature and is going to take the position of the parallel computation or Digital Signal Processor (DSP),Application Specific Integrated Circuit(ASIC) as a new embedded system precept.Field Programmable Gate Array(FPGA) with its special characteristic of low development cost,high parallel processing speed,large flexibility and short development cycle,has its unique superiority in the image processing system.Due to the project in this article,a kind of image capture and processing system based on FPGA is proposed,the low cost high performance Altera Corporation's Cycloneâ…¢series FPGA EP3C40F324 is selected as the main core,the design of the whole system including software and hardware are implemented.The way of how to insert the Niosâ…¡soft processor core in FPGA,complete the image capture and processing system function and the design proposal is elaborated thereinafter.The hardware circuit is composed of three electric circuit boards:The FPGA core processing board,the image capture card,the image display board. Through I~2C the working pattern of the image capture card is initialized.Under the control of capture module,the image data captured is saved in SDRAM;According to VGA display principle and timing relationship,VGA display and output control module is designed,the VGA controlling signal is generated,also according to VGA monitor industry standard,the horizontal and frame synchronizing signal of the VGA interface are synthesized.Logically,the FPGA internal logic hardware function module is generated by using SOPC Builder.Niosâ…¡IP core is customized,the CMOS image capture module,VGA Controller and the I~2C bus interface are implemented. The system among various modules is connected through the Avalon Bus.In the software part,the algorithms of the color image,color space transformation, binaryzation,morphology corrosion processing and localization of target are realized in Niosâ…¡core.Experimental results prove right and feasible by adopting the algorithm and scheme proposed in this paper.