Research On Space Sparse Target Imaging Method Based On Compressed Sensing

With the continuous development of the modem technology，people want to beable to acquire a higher image quality and faster image speed．Optical imaging systemneeds to continuously upgrade its resolution, expand its imaging band. We can onlyimprove the performance of the imaging system by reducing the pixel size andincrease the number of pixels. This put forward higher requirements of thesemiconductor manufacturing level. It is so costly infrared imaging systemcomplexity and difficulty to achieve a non-linear increase. To solve theseproblems,some target in the infrared is only a small bright spots in the darkbackground,and has a sparse feature in the spatial domain.So,we propose a fast andefficient targeting and imaging methods to reduce the infrared band imaging probedevice resolution requirements.The paper uses an emerging signal sampling theory-compressed sensing theory.The core idea is the observation sparse signal compression and sampling merger, onlya small amount of observational data can accurately reconstruct the originalsignal.The imaging system includes an analog sparse target system.Photodetectorfront end amplification system,DMD driving system.A signal processing system andthe target reconfigurable system. The paper uses a deterministic matrix: Hadamardmatrix odd rows. Because of its elements are an integer of1or-1, so easy to achievein a DMD imaging system encoding.On the basis of the research group studies,firstly,build a experiment platform of space sparse target imaging system and enable DMDto achieve OHM matrix at high speed flip.Secondly,use C language completes OMPreconstruction algorithm.Finally,write the PC software and on-line control of theDMD to complete space spare goals real-time position and imaging.Our level of focalplane array detectors and image processing technology is very backward,but theinfrared point source dector technology has been very mature. Experimental resultshows that the imaging method can complete high-resolution infrared target imagingusing infrared point source detecter, and obtain the information of infrared images weneed.