The Research Of FPGA-based Image Acquisition And Processing Measurement System

Recent years, image processing and machine vision technology continues to moveforward, results of their research has gradually been applied to all areas of sociallives;FPGA is a high-performance programmable logic device, its structure is suitable forimage processing algorithms to achieve the acceleration with hardware. For high-speed,high-precision measurement of the development direction of modern visual system,I choseto use FPGA as the hardware platform, to study around these two trends.After building up the real-time online measurement platform based on FPGA, thispaper uses hardware acceleration methods to solve problems of online image processingand distortion correction, First of all, I realize the configuration and initialization of theimage sensor image via Verilog programming language; Operations of image processingtemplate used to the convolution require to change of the image data from serial form intoparallelism, so this paper put forward a method to get the data parallel oriented form anddesign appropriate hardware architecture;As for typical image processing algorithms, givethe structure of FPGA-based implementation and use System Generator to build modelsfor these algorithm structure, then verify the correctness of the design.In embedded-image-processing systems,CORDIC algorithm can implement somecertain elementary functions for real-time online computing.I study the structure anddesign it’s hardware based-on FPGA, then make the corresponding simulation; After theintroduction of pinhole camera model which is the basis of the visual measurement, I theanalyse and study the effects of distortion after distortion model is introduced. Bydeducing the formula of four-order radial distortion model, this paper describes a easymethod of to obtaine distortic parameters about radial distortion model. Specifically forsecond-order radial distortion model, gives a distortion correction architecture using theFPGA hardware implementation, the architecture includes reverse mapping correctionscheme to obtain the coordinates and bilinear interpolation two parts.Using Matlab as a programming tool,set up a radial distortion correction module, theobservation of experimental results proved that distortion correction can make a great difference to improve the precision of visual measurement system,and the using of FPGAas a undisortion tool research is of great significance.