Research On Hihg Resolution Laser Active Imaging Technology Based On Single Photon Detection

Traditional imaging methods have low resolution and are susceptible to the surrounding environment and system components.In recent years,with the development of computer technology and quantum information technology,single-photon detection technology has emerged as the times require,and has attracted extensive attention from experts and scholars at home and abroad.Based on this,the single photon detection technology and the laser active imaging technology are combined,and the pulsed laser is used as the light source to illuminate the object,and the laser detection can be realized under the bad illumination condition,and the computer data processing is used to obtain the high resolution image.Therefore,laser active imaging is widely used in the field of low light detection.The use of single-photon technology to detect images requires a large number of single-photon pictures to be collected.When the number of pictures is too large,data processing takes a lot of time.This paper introduces the algorithm and optimization of image processing,compares the similarities and differences between the average gray method and the weighted gray method,and observes the image effects of the two algorithms to extract the centroid.Through algorithm optimization,the number of loops in the program is reduced,and the efficiency of image processing is improved.In addition,passive imaging experiments were carried out using a continuous light source to observe the processing effect of the algorithm.The resolution of the system was calculated to be 26.7 lp/mm.The image processing effects of 1px and 0.3px were compared by detecting two different resolution boards.In this project,a laser active imaging experimental system was built using Nd:YAG pulsed laser as the light source.Combined with the gate strobe function of the image intensifier,the laser distance strobe experiment was carried out and the distance resolution was further improved.By changing the delay time of the digital signal delayer,the distance between the two patterns is calculated,and objects of different distances are distinguished.In addition,the delay time is kept constant,the gate width of the image intensifier is increased,and the image information of the two objects can be obtained.The three-dimensional image of the two objects can be obtained by theintensity matrix of the two objects and the corresponding distance information.It is stated that changing the door width of the image intensifier can at least distinguish two objects separated by 15 cm.