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Incoherent holography by a Michelson type interferometer with a lens for a radial shear 用带径向剪切透镜的迈克尔逊型干涉仪进行的非相干全息照相
SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2223546
Kaho Watanabe, T. Nomura
{"title":"Incoherent holography by a Michelson type interferometer with a lens for a radial shear","authors":"Kaho Watanabe, T. Nomura","doi":"10.1117/12.2223546","DOIUrl":"https://doi.org/10.1117/12.2223546","url":null,"abstract":"The modified Michelson type interferometer with lenses for a radial shear to record incoherent holograms is proposed. It enables us to record a hologram by self-interference without coherent illumination such as a laser. The interferometer has two wave plates which can realize phase-shifting incoherent holography. The feature can avoid a very large bias term and the twin image, which are the inherent problem of incoherent holography by self-interference. The advantages of the proposed method using lenses and wave plates are easy adjustment of the zone plate and simplification of the optical system. A preliminary experiment using an LED as an incoherent object was performed to confirm the four step phase-shifting by wave plates.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122507051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
3D in natural random refractive distortions 三维自然随机折射畸变
SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2223517
Marina Alterman, Y. Schechner
{"title":"3D in natural random refractive distortions","authors":"Marina Alterman, Y. Schechner","doi":"10.1117/12.2223517","DOIUrl":"https://doi.org/10.1117/12.2223517","url":null,"abstract":"Random distortions naturally affect images taken through atmospheric turbulence or wavy water. They pose new 3D recovery problems. Distortions are caused by the volumetric field of turbulent air or the 3D shape of water waves. We show methods that recover these 3D distorting media. Moreover, it is possible to triangulate objects beyond the refracting medium. Applications include sensing and study of random refractive media in nature, and enhanced imaging including possibilities for a virtual periscope.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124192760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Resolution of electro-holographic image 电子全息图像的分辨率
SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2229345
J. Son, O. Chernyshov, Hyoung Lee, Beom-Ryeol Lee, M. Park
{"title":"Resolution of electro-holographic image","authors":"J. Son, O. Chernyshov, Hyoung Lee, Beom-Ryeol Lee, M. Park","doi":"10.1117/12.2229345","DOIUrl":"https://doi.org/10.1117/12.2229345","url":null,"abstract":"The resolution of the reconstructed image from a hologram displayed on a DMD is measured with the light field images along the propagation direction of the reconstructed image. The light field images reveal that a point and line image suffers a strong astigmatism but the line focusing distance differences for lines with different directions. This will be astigmatism too. The focusing distance of the reconstructed image is shorter than that of the object. The two lines in transverse direction are resolved when the gap between them is around 16 pixels of the DMD’s in use. However, the depth direction is difficult to estimate due to the depth of focus of each line. Due to the astigmatism, the reconstructed image of a square appears as a rectangle or a rhombus.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116249546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Benchmarking real-time RGBD odometry for light-duty UAVs 轻型无人机实时RGBD里程测量的基准测试
SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2225534
A. Willis, L. Sahawneh, K. Brink
{"title":"Benchmarking real-time RGBD odometry for light-duty UAVs","authors":"A. Willis, L. Sahawneh, K. Brink","doi":"10.1117/12.2225534","DOIUrl":"https://doi.org/10.1117/12.2225534","url":null,"abstract":"This article describes the theoretical and implementation challenges associated with generating 3D odometry estimates (delta-pose) from RGBD sensor data in real-time to facilitate navigation in cluttered indoor environments. The underlying odometry algorithm applies to general 6DoF motion; however, the computational platforms, trajectories, and scene content are motivated by their intended use on indoor, light-duty UAVs. Discussion outlines the overall software pipeline for sensor processing and details how algorithm choices for the underlying feature detection and correspondence computation impact the real-time performance and accuracy of the estimated odometry and associated covariance. This article also explores the consistency of odometry covariance estimates and the correlation between successive odometry estimates. The analysis is intended to provide users information needed to better leverage RGBD odometry within the constraints of their systems.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125246750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Accurate characterization of mask defects by combination of phase retrieval and deterministic approach 相位检索与确定性相结合的掩模缺陷精确表征
SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2224712
M. Park, T. Leportier, Wooshik Kim, J. Song
{"title":"Accurate characterization of mask defects by combination of phase retrieval and deterministic approach","authors":"M. Park, T. Leportier, Wooshik Kim, J. Song","doi":"10.1117/12.2224712","DOIUrl":"https://doi.org/10.1117/12.2224712","url":null,"abstract":"In this paper, we present a method to characterize not only shape but also depth of defects in line and space mask patterns. Features in a mask are too fine for conventional imaging system to resolve them and coherent imaging system providing only the pattern diffracted by the mask are used. Then, phase retrieval methods may be applied, but the accuracy it too low to determine the exact shape of the defect. Deterministic methods have been proposed to characterize accurately the defect, but it requires a reference pattern. We propose to use successively phase retrieval algorithm to retrieve the general shape of the mask and then deterministic approach to characterize precisely the defects detected.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115162964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Generalized phase-shifting color digital holography 广义相移彩色数字全息术
SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2224918
T. Nomura, T. Kawakami, Kazuma Shinomura
{"title":"Generalized phase-shifting color digital holography","authors":"T. Nomura, T. Kawakami, Kazuma Shinomura","doi":"10.1117/12.2224918","DOIUrl":"https://doi.org/10.1117/12.2224918","url":null,"abstract":"Two methods to apply the generalized phase-shifting digital holography to color digital holography are proposed. One is wave-splitting generalized phase-shifting color digital holography. This is realized by using a color Bayer camera. Another is multiple exposure generalized phase-shifting color digital holography. This is realized by the wavelength-dependent phase-shifting devices. Experimental results for both generalized phase-shifting color digital holography are presented to confirm the proposed methods.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115416052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A method of quantifying moirés on 3D displays 一种量化三维显示器上波纹的方法
SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2230059
Gwangsoon Lee, Eung-Don Lee, Y. Kim, N. Hur, J. Son
{"title":"A method of quantifying moirés on 3D displays","authors":"Gwangsoon Lee, Eung-Don Lee, Y. Kim, N. Hur, J. Son","doi":"10.1117/12.2230059","DOIUrl":"https://doi.org/10.1117/12.2230059","url":null,"abstract":"A method of quantifying the amount of moirés in contact-type 3-D displays is described. The color moirés in the displays are induced by the periodic blocking of a part of each pixel on the panel by the boundary lines or the barrier lines consisting of the viewing zone forming optics. The method starts calculating the intensity of an image laden with moirés and that of the image with no moirés. The moirés contrast is defined as the intensity difference of the two images. The contrast values match well with those from the simulated moirés for the crossing angle range of 0° to 20°.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123883078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modification of the reconstruction distance of Fresnel holograms for display with multiple spatial light modulators 多空间光调制器显示菲涅耳全息图重建距离的修正
SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2224713
T. Leportier, M. Park, Taegeun Kim
{"title":"Modification of the reconstruction distance of Fresnel holograms for display with multiple spatial light modulators","authors":"T. Leportier, M. Park, Taegeun Kim","doi":"10.1117/12.2224713","DOIUrl":"https://doi.org/10.1117/12.2224713","url":null,"abstract":"In digital holography, spatial light modulators (SLMs) devices are used to display the holographic patterns. However, modulation is imperfect because SLMs cannot modulate phase and amplitude at the same time. Then undesired terms such as twin image can be observed in the image plane. One solution to remove twin image contribution without physical spatial filter is to perform complex modulation. Phase and amplitude modulation can be performed sequentially with two different SLMs. Similarly, real and imaginary part of hologram can be displayed and combined in an additive configuration through a polarizing beam splitter. In both case, a major problem is the alignment of the two display devices since misalignment as small as one pixel may degrade significantly quality of the reconstruction. For our experiment, we used data computed numerically to obtain separately real and imaginary part of hologram. Then, we focused on additive configuration where two SLMs are displaying real and imaginary part of hologram respectively. Reconstruction distance of hologram is fixed and distance between SLM and beam splitter should be the same for the two devices. In this paper, we study the effect of having different reconstruction distance for the real and imaginary hologram. We performed simulations and explained the result with the scalar diffraction theory. A method to compensate numerically the reconstruction distance is proposed for on-axis configuration. This method can also be applied to modify reconstruction distance of Fresnel hologram displayed with a single SLM and has potential application in RGB holographic reconstruction","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126443455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Three-dimensional integral imaging displays using a quick-response encoded elemental image array: an overview 使用快速响应编码元素图像阵列的三维整体成像显示:概述
SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2223022
A. Markman, B. Javidi
{"title":"Three-dimensional integral imaging displays using a quick-response encoded elemental image array: an overview","authors":"A. Markman, B. Javidi","doi":"10.1117/12.2223022","DOIUrl":"https://doi.org/10.1117/12.2223022","url":null,"abstract":"Quick-response (QR) codes are barcodes that can store information such as numeric data and hyperlinks. The QR code can be scanned using a QR code reader, such as those built into smartphone devices, revealing the information stored in the code. Moreover, the QR code is robust to noise, rotation, and illumination when scanning due to error correction built in the QR code design. Integral imaging is an imaging technique used to generate a three-dimensional (3D) scene by combining the information from two-dimensional (2D) elemental images (EIs) each with a different perspective of a scene. Transferring these 2D images in a secure manner can be difficult. In this work, we overview two methods to store and encrypt EIs in multiple QR codes. The first method uses run-length encoding with Huffman coding and the double-random-phase encryption (DRPE) to compress and encrypt an EI. This information is then stored in a QR code. An alternative compression scheme is to perform photon-counting on the EI prior to compression. Photon-counting is a non-linear transformation of data that creates redundant information thus improving image compression. The compressed data is encrypted using the DRPE. Once information is stored in the QR codes, it is scanned using a smartphone device. The information scanned is decompressed and decrypted and an EI is recovered. Once all EIs have been recovered, a 3D optical reconstruction is generated.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"9867 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130844684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A horizontal parallax table-top floating image system with freeform optical film structure 一种具有自由曲面光学薄膜结构的水平视差桌面浮动成像系统
SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2229400
Ping‐Yen Chou, Yi-Pai Huang, Chien-Chung Liao, Chuan-Chung Chang, Fu-Ming Chuang, Chao-Hsu Tsai
{"title":"A horizontal parallax table-top floating image system with freeform optical film structure","authors":"Ping‐Yen Chou, Yi-Pai Huang, Chien-Chung Liao, Chuan-Chung Chang, Fu-Ming Chuang, Chao-Hsu Tsai","doi":"10.1117/12.2229400","DOIUrl":"https://doi.org/10.1117/12.2229400","url":null,"abstract":"In this paper, a new structure of horizontal parallax light field 3D floating image display system was proposed. The structure consists of pico-projectors, Fresnel lens, micro-lens array and sub-lens array with freeform shape. By the functions of optical components, each light field of projectors could be controlled as a fan ray, which has high directivity in horizontal and wide scattered angle in vertical. Furthermore, according to the reverse light tracing and integral image display technique, horizontal parallax floating 3D could be demonstrated in the system. Simulated results show that the proposed 3D display structure has a good image quality and the crosstalk is also limited below 22.9%. Compared with other 3D technologies, this structure could have more benefits, including displaying real high resolution floating image, unnecessary of physical hardware on the image plane, scalability of large size system, without the noise from spinning component, and so on.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121024525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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