SPIE Commercial + Scientific Sensing and Imaging最新文献_第4页

3D augmented reality with integral imaging display 三维增强现实集成成像显示

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2222068

Xin Shen, H. Hua, B. Javidi

引用次数: 0

Liquid crystal lens array for 3D microscopy and endoscope application 液晶透镜阵列用于三维显微镜和内窥镜的应用

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2229452

Yi-Pai Huang, Po-Yuan Hsieh, Amir Hassanfiroozi, C. Chu, Y. Hsuan, M. Martinez, B. Javidi

引用次数: 3

Wavefront printing technique with overlapping approach toward high definition holographic image reconstruction 基于重叠方法的波前打印技术用于高清晰度全息图像重建

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2229517

K. Wakunami, R. Oi, T. Senoh, H. Sasaki, Y. Ichihashi, K. Yamamoto

{"title":"Wavefront printing technique with overlapping approach toward high definition holographic image reconstruction","authors":"K. Wakunami, R. Oi, T. Senoh, H. Sasaki, Y. Ichihashi, K. Yamamoto","doi":"10.1117/12.2229517","DOIUrl":"https://doi.org/10.1117/12.2229517","url":null,"abstract":"A hologram recording technique, generally called as “wavefront printer”, has been proposed by several research groups for static three-dimensional (3D) image printing. Because the pixel number of current spatial light modulators (SLMs) is not enough to reconstruct the entire wavefront in recording process, typically, hologram data is divided into a set of subhologram data and each wavefront is recorded sequentially as a small sub-hologram cell in tiling manner by using X-Y motorized stage. However since previous works of wavefront printer do not optimize the cell size, the reconstructed images were degraded by obtrusive split line due to visible cell size caused by too large cell size for human eyesight, or by diffraction effect due to discontinuity of phase distribution caused by too small cell size. In this paper, we introduce overlapping recording approach of sub-holograms to achieve both conditions: enough smallness of apparent cell size to make cells invisible and enough largeness of recording cell size to suppress diffraction effect by keeping the phase continuity of reconstructed wavefront. By considering observing condition and optimization of the amount of overlapping and cell size, in the experiment, the proposed approach showed higher quality 3D image reconstruction while the conventional approach suffered visible split lines and cells.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"59 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":"134024175","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: 21

The effect of object shape and laser beam shape on lidar system resolution 物体形状和激光束形状对激光雷达系统分辨率的影响

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2225197

Hongchang Cheng, Jingyi Wang, J. Ke

{"title":"The effect of object shape and laser beam shape on lidar system resolution","authors":"Hongchang Cheng, Jingyi Wang, J. Ke","doi":"10.1117/12.2225197","DOIUrl":"https://doi.org/10.1117/12.2225197","url":null,"abstract":"In a LIDAR system, a pulsed laser beam is propagated to a scene, and then reflected back by objects. Ideally if the beam diameter and the pulse width are close to zero, then the reflected beam in time domain is similar to a delta function, which can accurately locate an object's position. However, in a practical system, the beam has finite size. Therefore, even if the pulse width is small, an object shape will make the reflected beam stretched along the time axis, then affect system resolution. In this paper, we assume the beam with Gaussian shape. The beam can be formulated as a delta function convolved with a shape function, such as a rectangular function, in time domain. Then the reflected beam can be defined as a system response function convolved with the shape function. We use symmetric objects to analyze the reflected beam. Corn, sphere, and cylinder objects are used to find a LIDAR system's response function. The case for large beam size is discussed. We assume the beam shape is similar to a plane wave. With this assumption, we get the simplified LIDAR system response functions for the three kinds of objects. Then we use tiny spheres to emulate an arbitrary object, and study its effect to the returned beam.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"1 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":"130552571","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

Integral imaging acquisition and processing for visualization of photon counting images in the mid-wave infrared range 中波红外光子计数图像可视化的积分成像采集与处理

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2225872

P. Latorre-Carmona, F. Pla, B. Javidi

引用次数: 0

iGRaND: an invariant frame for RGBD sensor feature detection and descriptor extraction with applications iGRaND:用于RGBD传感器特征检测和描述符提取的不变框架

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2225540

A. Willis, K. Brink

引用次数: 2

Stereoscopic depth of field: why we can easily perceive and distinguish the depth of neighboring objects under binocular condition than monocular 立体景深:为什么双眼比单眼更容易感知和分辨周围物体的景深

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2229509

Kwang-Hoon Lee, M. Park

{"title":"Stereoscopic depth of field: why we can easily perceive and distinguish the depth of neighboring objects under binocular condition than monocular","authors":"Kwang-Hoon Lee, M. Park","doi":"10.1117/12.2229509","DOIUrl":"https://doi.org/10.1117/12.2229509","url":null,"abstract":"In this paper, we introduce a high efficient and practical disparity estimation using hierarchical bilateral filtering for realtime view synthesis. The proposed method is based on hierarchical stereo matching with hardware-efficient bilateral filtering. Hardware-efficient bilateral filtering is different from the exact bilateral filter. The purpose of the method is to design an edge-preserving filter that can be efficiently parallelized on hardware. The proposed hierarchical bilateral filtering based disparity estimation is essentially a coarse-to-fine use of stereo matching with bilateral filtering. It works as follows: firstly, the hierarchical image pyramid are constructed; the multi-scale algorithm then starts by applying a local stereo matching to the downsampled images at the coarsest level of the hierarchy. After the local stereo matching, the estimated disparity map is refined with the bilateral filtering. And then the refined disparity map will be adaptively upsampled to the next finer level. The upsampled disparity map used as a prior of the corresponding local stereo matching at the next level, and filtered and so on. The method we propose is essentially a combination of hierarchical stereo matching and hardware-efficient bilateral filtering. As a result, visual comparison using real-world stereoscopic video clips shows that the method gives better results than one of state-of-art methods in terms of robustness and computation time.","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":"133414826","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

An exact and efficient 3D reconstruction method from captured light-fields using the fractional Fourier transform 利用分数傅里叶变换对捕获的光场进行精确、高效的三维重建

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2228986

Ziv Mhabary, O. Levi, E. Small, A. Stern

引用次数: 1

Real-time geometric scene estimation for RGBD images using a 3D box shape grammar 基于三维盒形语法的RGBD图像实时几何场景估计

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2225545

A. Willis, K. Brink

引用次数: 0

Local frequency estimation from intensity gradients in spatial carrier fringe pattern analysis 空间载波条纹图分析中强度梯度的局域频率估计

SPIE Commercial + Scientific Sensing and Imaging Pub Date : 2016-06-01 DOI: 10.1117/12.2224758

Ruihua Zhang, Hongwei Guo

{"title":"Local frequency estimation from intensity gradients in spatial carrier fringe pattern analysis","authors":"Ruihua Zhang, Hongwei Guo","doi":"10.1117/12.2224758","DOIUrl":"https://doi.org/10.1117/12.2224758","url":null,"abstract":"Spatial carrier fringe pattern analysis is an effective tool in optical measurement, e.g. in interferometry and fringe projection technique. With it, the very large phase deformations in a spatial carrier fringe pattern may increases the bandwidth of fringe component thus leading to difficulties in retrieving its phase map. In order to overcome this problem, many local-adaptive methods have been developed for processing the spatial carrier fringe pattern with large phase variations, and in fact, the local spatial frequency estimation is central to these methods. This paper introduces a simple algorithm for estimating the local frequencies of a fringe pattern with spatial carrier. First, the intensity gradients of the fringe pattern are calculated, and then the standard deviations (SDs) of the intensity gradients at each pixel are estimated from its neighborhood. Finally the local frequencies are estimated from the SDs just calculated simply using an arccosine function. This algorithm is potential in developing effective techniques for retrieving phases from a spatial carrier fringe pattern with large phase variations. For example, we can recover the phase map by directly integrating the local frequencies or by use of an adaptive spatial carrier phase shifting algorithm (SCPS) with the local frequencies being the local phase shifts. It can also be used in Fourier transform method for exactly determining the carrier frequencies, or for extrapolating aperture in order to reduce the boundary effect. Combined with time-frequency techniques such as windowed Fourier transform and wavelet transform methods, it is helpful for alleviating the computational burdens.","PeriodicalId":299313,"journal":{"name":"SPIE Commercial + Scientific Sensing and Imaging","volume":"55 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":"128350029","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