摘要
为改善硬件提升的局限,将滤波技术和生成对抗网络(GAN)应用于脉冲展宽分幅相机空间分辨性能提升,并采用图像梯度和成像调制度量化提升效果。研究结果显示,高斯-拉普拉斯算子、同态滤波和GAN均能不同程度提升脉冲展宽分幅相机的空间分辨性能,而将同态滤波的图像增强和GAN的去模糊相结合,能更显著地提升分辨效果,并将图像整体平均梯度由初始的1.456提高到3.399;近轴5 lp/mm区域的局部平均梯度由7.638提高至23.901,平均调制度由7.84%提高至24.32%;远轴5 lp/mm区域的局部平均梯度由3.869提高至11.349,平均调制度由6.07%提高至19.60%。研究结论不仅为脉冲展宽分幅相机空间分辨性能的提升提供了参考方法,而且为滤波和去模糊技术融入超快诊断领域提供了新思路。
Objective The pulse-dilation framing camera is a kind of two-dimensional ultra-fast diagnostic equipment with a temporal resolution of better than 10 ps.However,since its spatial resolution performance is relatively poor due to the design of the long drift region and magnetic focusing,it is difficult to acquire higher-sharpness images in inertial confinement fusion experiments.Although a better effect can be yielded by changing the type and increasing the number of magnetic focusing lenses,some factors such as the stronger magnetic field,larger volume,and non-reuse put forward higher requirements for magnetic shielding,portability,and development cost of the equipment.Therefore,the feasibility of improving the spatial resolution performance of the framing camera is discussed by incorporating deblurring and filtering techniques to improve the spatial resolution performance via hardware optimization.Methods To improve the spatial resolution performance of the pulse-dilation framing camera,we first build a model of the pulse-dilation framing camera with double short magnetic focusing.The imaging characteristics are analyzed by simulating the imaging magnetic field distribution,tracing the electronic motion trajectory,and collecting the imaging distribution of regions and points.Then,the filtering technique principle is introduced,and the resolution plate image of the pulse-dilation framing camera is processed by optimizing the filtering operator.Next,according to the basic principle of the deblurring technique,the generative adversarial network(GAN)model is built by designing the generator network,discriminator network,and loss function.Finally,the collected images are processed by coupling the deblurring with filtering techniques,and the spatial resolution performance improvement is quantified by the relevant evaluation indicators.Results and Discussions Firstly,according to the working principle of the pulse-dilation framing camera with magnetic focusing,the characteristics of the reduction imaging and stripes of
作者
徐付涛
白雁力
钟思
宋明诚
Xu Futao;Bai Yanli;Zhong Si;Song Mingcheng(School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China;School of Mechanical and Electrical Engineering,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2024年第11期315-323,共9页
Acta Optica Sinica
基金
国家自然科学基金(11865007)
广西自然科学基金(2022GXNSFAA035561)
广西自动检测技术与仪器重点实验室主任基金(YQ22101)
广西图像图形与智能处理重点实验室(桂林电子科技大学)开放基金(GIIP2210)。
关键词
超快光学
诊断技术
脉冲展宽分幅相机
生成对抗网络
滤波技术
空间分辨率性能
ultra-fast optics
diagnostic technique
pulse-dilation framing camera
generative adversarial networks
filtering technique
spatial resolution performance