王甜甜 Wang Tiantian, 何迪 He Di, 刘畅 Liu Chang, 邱钧 Qiu Jun
{"title":"基于频谱集中程度的重参数化在光场去噪中的应用","authors":"王甜甜 Wang Tiantian, 何迪 He Di, 刘畅 Liu Chang, 邱钧 Qiu Jun","doi":"10.3788/aos230659","DOIUrl":"https://doi.org/10.3788/aos230659","url":null,"abstract":"从频谱支集对称程度及夹角两个结构特点出发,分析频谱支集结构变化对于去噪效果的影响,提出光场频谱支集集中程度的概念,并设计相应的度量函数。通过极小化集中程度度量函数,计算合适的光场双平面间距,按照此间距在去噪前对光场数据进行重参数化可以提高滤波去噪效果。HCI模拟光场数据和斯坦福实测光场数据实验结果表明,引入重参数化的光场滤波去噪方法能够优化去噪结果。从视觉上看,在滤除更多噪点的同时保留场景更多的结构和纹理信息;从定量评价上看,峰值信噪比和结构相似度指标也有所提高。","PeriodicalId":7103,"journal":{"name":"光学学报","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135659724","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}
周牧 Zhou Mu, 嵇长银 Ji Changyin, 王勇 Wang Yong, 曹静阳 Cao Jingyang
{"title":"基于双步符合计数的纠缠光量子成像方法","authors":"周牧 Zhou Mu, 嵇长银 Ji Changyin, 王勇 Wang Yong, 曹静阳 Cao Jingyang","doi":"10.3788/aos230439","DOIUrl":"https://doi.org/10.3788/aos230439","url":null,"abstract":"为了提高纠缠光量子成像效率,本文采用双步符合计数法快速获取目标成像信息,降低纠缠光量子成像的时间开销。首先,利用透镜和波片组合对激光器产生的泵浦光进行调制,提高周期极化磷酸氧钛钾(PPKTP)晶体自发参量下转换的效率;然后,通过数字微镜器件(DMD)选取测距区域,构造单光子时间脉冲序列差值;其次,利用该差值完成局部符合计数以得到信号和参考光路的延时差;再次,通过控制DMD选取成像区域,对单光子时间脉冲序列进行修正,并利用修正后的序列完成全局符合计数;最后,将符合计数值与灰度值进行映射,得到目标的量子图像。此外,通过与经典量子成像结果相比较,分析了目标距离、测距区域大小和单像素曝光时间对成像结果的影响,同时搭建了实际的量子成像光路以验证本文方法的有效性。","PeriodicalId":7103,"journal":{"name":"光学学报","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135659742","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}