Based On Nios Ⅱ Infrared Image Processing Algorithms And Implementation

As the rapid developing of scientific technology, infrared imaging system plays animportant part in modern high-technology battles and for civil use. Due to the inherentcharacteristics and bondage of infrared device, most of infrared images are not imagedvery well, there are defects like obscure image border, low contrast ratio between targetand background, etc. So it’s an important way to add image processing into infraredoriginal image. The hardware circuit of original designed DSP and FPGA frame werecomplicated. and has a high demand on clock controlling, which lead to lowtransmission efficiency and the control and operation of bottom interface is complicated,at the same time, the NiosII soft core system inside FPGA which has advantagesincluding programmable and cuttable software and hardware and it has got more andmore attention of most designers. NiosII soft core can call inside soft core to simplifydesign and thus many functions can be realized. So the system can be optimized and thefunction of system can be strengthened when infrared image processing algorithm isrealized in NiosII system.This dissertation, as for the purpose of practicality and single chip miniaturization,is based on the original infrared image processing algorithm and infrared imaging, andthe infrared image processing algorithm based on NiosII were realized. The main chipthis design use is Altera company-produced-EP1S20F672C7, which belongs to Stratixseries.The infrared image processing is realized by studying soft core mechanism ofNiosII and the software and hardware design on the whole system. The pretreatment oninfrared image and control on NiosII need to be included in this algorithm. Relativebasic theory of infrared image processing was analyzed under the pretreatment ofinfrared image. The algorithm of blind pixels compensation, non uniformity correctionand image enhancement were realized in image based on relative theory and hardwarealgorithm. In addition, design of every module in NiosII processor system was analyzedin detail. NiosII soft core processor was introduced first,then the function of Avalon buswas detailed, and periphery circuit was designed in ways such as how to download anddebug. On the part of software, the control of memory device and image data storage and operation of periphery chip were elaborated. The processing of infrared image wasrealized, after non uniformity correction and blind pixels compensation,the fixed patternnoise FPN is1.46,which is much smaller than original image FPN8.71. At last, thiswhole study was concluded. The result of this experiment shows: not only the aim ofminiaturizing single chip was realized, but also non uniformity, low color resolution andlow contrast of infrared image were totally solved.