激光与光电子学进展Pub Date : 2023-01-01DOI: 10.3788/lop223279
胡志新 Hu Zhixin, 曹刘洋 Cao Liuyang, 裴东芳 Pei Dongfang, 梅紫俊 Mei Zijun
{"title":"自适应精简点云改进预处理优化三维重建算法","authors":"胡志新 Hu Zhixin, 曹刘洋 Cao Liuyang, 裴东芳 Pei Dongfang, 梅紫俊 Mei Zijun","doi":"10.3788/lop223279","DOIUrl":"https://doi.org/10.3788/lop223279","url":null,"abstract":"针对初始点云离群点噪声大、冗余性高导致三维重建效率低、重建曲面表面粗糙等问题，提出一种自适应精简点云改进预处理算法。首先使用统计滤波消除离群点噪声，并在基于体素重心邻近特征点下采样中引入双曲正切函数，在保持点云特征不变的情况下精简点云数据；然后建立移动最小二乘法拟合函数，确定其二次基函数和高斯权函数，完成点云数据平滑优化；最后使用投影三角化算法完成点云曲面重建。实验结果表明，所提算法在有效去除离群点的同时，还能精简点云数据、提升曲面重建效率，且重建后的模型表面光滑、孔洞减少。","PeriodicalId":51502,"journal":{"name":"激光与光电子学进展","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135659398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
激光与光电子学进展Pub Date : 2023-01-01DOI: 10.3788/lop221435
李天澍 Li Tianshu, 邓德伟 Deng Dewei, 李振华 Li Zhenhua, 胡冰 Hu Bing, 孙奇 Sun Qi, 张勇 Zhang Yong
{"title":"激光功率对Fe-TiC复合涂层组织及硬度的影响","authors":"李天澍 Li Tianshu, 邓德伟 Deng Dewei, 李振华 Li Zhenhua, 胡冰 Hu Bing, 孙奇 Sun Qi, 张勇 Zhang Yong","doi":"10.3788/lop221435","DOIUrl":"https://doi.org/10.3788/lop221435","url":null,"abstract":"为增强304不锈钢表面性能，利用激光熔覆技术在其表面制备了TiC颗粒增强Fe基复合涂层，研究了激光功率对涂层几何特征、组织特征及硬度的影响规律和原因，引入灰关联分析综合表征熔覆层的组织特征，并推测出激光熔覆过程中TiC颗粒的熔解机制。结果表明，随激光功率的增加，熔覆层高度、气孔率、未熔TiC颗粒含量降低，宽度、深度、稀释率、析出TiC的二次枝晶臂间距增加，析出TiC含量先增加后降低、基体的二次枝晶臂间距先降低后升高且在1800 W时分别达到最高和最低。当激光功率为1800 W时，熔覆层表面成形良好，其组织特征均衡发展且灰关联度达到最大，平均硬度为801.5 HV0.5，达到基体的4.5倍左右。另外，TiC颗粒在激光熔覆中共有两种熔解机制，其特征分别为由外向内和整体分解，两种机制共同作用导致TiC颗粒的完全熔解。","PeriodicalId":51502,"journal":{"name":"激光与光电子学进展","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135659429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
激光与光电子学进展Pub Date : 2023-01-01DOI: 10.3788/lop222593
阳结根 Yang Jiegen, 胡枫 Hu Feng, 丁纬 Ding Wei, 邹林儿 Zou Liner
{"title":"大景深胶囊内窥镜光学系统设计","authors":"阳结根 Yang Jiegen, 胡枫 Hu Feng, 丁纬 Ding Wei, 邹林儿 Zou Liner","doi":"10.3788/lop222593","DOIUrl":"https://doi.org/10.3788/lop222593","url":null,"abstract":"小肠肠道发病原因隐匿并且小肠存在大量褶皱，大景深光学系统有利于在诊断过程中获得更多的病理信息，而目前市面上的胶囊内窥镜光学系统景深较小。所提胶囊内窥镜光学系统在保证一定分辨率的同时，还可在7~100 mm大景深范围内有效成像。该系统视场角为100°，F数为5，在全视场范围内调制传递函数均大于0.35（在125 lp/mm频率处），在与之搭配的OV9734成像芯片上能够满足成像要求。并对该光学系统进行了公差分析，结果表明其在可加工范围内能满足常规生产与装调。","PeriodicalId":51502,"journal":{"name":"激光与光电子学进展","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135662112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
激光与光电子学进展Pub Date : 2023-01-01DOI: 10.3788/lop202360
曹一青 Cao Yiqing
{"title":"长焦距离轴全反射式三档变焦光学系统设计","authors":"曹一青 Cao Yiqing","doi":"10.3788/lop202360","DOIUrl":"https://doi.org/10.3788/lop202360","url":null,"abstract":"提出了一种基于变焦原理和初级像差理论的机械补偿式的长焦距离轴全反射式三档变焦光学系统设计方法。首先，建立了同轴四反射镜变焦光学系统初始结构求解模型，基于该模型，应用开发的自适应变异概率遗传算法对其进行求解，得到了同轴系统部分初始结构参数；然后，将其进行适当偏心和倾斜来消除共轴系统中心遮拦问题，结合光学设计软件Zemax对离轴系统像差进行校正。最后，应用上述设计方法，系统中各块反射镜光学面采用非球面设计，设计出高成像质量的焦距为300、600、900 mm的三档变焦离轴四反射镜光学系统。结果表明，该方法为离轴全反射式三档变焦光学系统设计提供了一种有效手段，能设计出满足实际应用需求的系统。","PeriodicalId":51502,"journal":{"name":"激光与光电子学进展","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135662317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
激光与光电子学进展Pub Date : 2023-01-01DOI: 10.3788/lop222969
涂敏 Tu Min, 鄢秋荣 Yan Qiurong, 郑勇健 Zheng Yongjian, 熊贤成 Xiong Xiancheng, 邹荃 Zou Quan, 戴钱玲 Dai Qianling, 卢孝强 Lu Xiaoqiang
{"title":"基于深度学习的单光子非视域成像泊松降噪","authors":"涂敏 Tu Min, 鄢秋荣 Yan Qiurong, 郑勇健 Zheng Yongjian, 熊贤成 Xiong Xiancheng, 邹荃 Zou Quan, 戴钱玲 Dai Qianling, 卢孝强 Lu Xiaoqiang","doi":"10.3788/lop222969","DOIUrl":"https://doi.org/10.3788/lop222969","url":null,"abstract":"在非视域成像场景中，有效的回波光子大量减少，泊松噪声对非视域成像的质量影响较大。传统图像泊松降噪算法存在迭代时间长、模式固定和手动设置参数等问题。为提高非视域成像质量，设计一种基于深度学习的单光子非视域成像泊松降噪方法。为解决训练样本不足的问题，利用几何光学近似和蒙特卡罗方法对非视域场景下的光子运动轨迹进行追踪建模，对非视域成像过程进行仿真，利用仿真数据重建的泊松噪声图像制作数据集。设计基于注意力机制的特征增强降噪网络（AEF-Net），利用仿真数据对网络进行优化训练。最后，搭建一套非视域成像系统对网络的泊松降噪性能进行验证。实验结果表明所提AEF-Net去除非视域场景下的泊松噪声效果优于传统降噪算法。","PeriodicalId":51502,"journal":{"name":"激光与光电子学进展","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135662354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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