共查询到19条相似文献,搜索用时 109 毫秒
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本文提出了一种自动分类立体图象的算法,首先,提取左,右两幅图象的区域特征,然后定义矩阵R描述左,右图象的关系,最后匹配其区域特征,同时还对的图象的视差进行了讨论。 相似文献
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理论研究了利用剩余射线带色散补偿相位匹配原理,在Ⅲ-Ⅴ族和Ⅱ-Ⅳ族光学各向同性的半导体非线性晶体中差频产生可调谐THz波的可行性问题.根据这些半导体材料的色散特性,并以近简并点双共振KTP-OPO的可调谐相干双波长输出作为差频抽运源,对它们的相位匹配能力、差频增益特性、品质因数以及差频过程中的相干长度进行了理论分析和计算,确定了ZnTe晶体是在共线相位匹配情况下较为理想的THz波差频晶体,而InP晶体则更适合用于非共线相位匹配情况.
关键词:
非线性光学
THz辐射
差频
各向同性半导体晶体 相似文献
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Luis M. Murillo-Mora Katsuyuki Okada Toshio Honda Jumpei Tsujiuchi 《Optical Review》1994,1(2):195-197
An image processing technique to display a distortion-free reconstructed image from a rainbow type conical holographic stereogram is proposed. The method consists of forming a new set of 2D images from the original set by applying an image process. The image processing method is made through ray tracing equations. The results show that the performance of the proposed method is good as it removes distortion of the image. 相似文献
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Reconstruction resolution enhancement of EPISM based holographic stereogram with hogel spatial multiplexing
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Yunpeng Liu 《中国物理 B》2022,31(4):44201-044201
We investigate how the splicing mode of a holographic element (hogel) affects the reconstruction of a 3D scene to improve the reconstruction resolution of a holographic stereogram fabricated using the effective perspective image segmentation and mosaicking method (EPISM). First, the effect of hogel spatial multiplexing on holographic recording and reconstruction is studied based on the mechanism of recording interference fringes in the holographic recording medium. Second, combined with the influence of multiple exposures on the hologram's diffraction efficiency, the diffraction efficiency of the holographic stereogram is analyzed in the spatial multiplexing mode. The holographic stereogram is then regarded as a special optical imaging system. The theory of spatial bandwidth product is adopted to describe the comprehensive resolution of the holographic stereogram, which explains why hogel spatial multiplexing can significantly improve the reconstruction resolution of a holographic stereogram. Compared with the traditional printing method under the same parameters in optical experiments, hogel spatial multiplexing has a lower diffraction efficiency but a higher quality of reconstructed image, consistent with the theoretical analysis. 相似文献
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基于网格点投影灰度相似性的三维重建新方法 总被引:2,自引:1,他引:1
基于双目立体视觉的三维重构是计算机视觉技术的主要内容之一,在机器人视觉导航、航空测绘、医学成像和工业检测等很多领域都有广泛的应用.提出一种基于网格点投影灰度相似性的双日立体视觉的三维重建新方法.首先将被测物体所在的世界坐标系划分成问距卡日等的矩形网格,将网格节点作为潜在的物点投影到左右图像坐标系上,然后根据不同深度的空间点在两幅图像上相应的灰度相似性来判断被测物体在三维空间中的深度信息.通过Matlab平台下的仿真实验证明了本方法的三维重建效果和计箅效率都要优于传统方法.与传统的图像匹配方法相比,具有算法简单、速度快、精度高、且不受摄像装置非线性畸变影响的优点. 相似文献
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In the case that the image reconstructed from a cylindrical holographic stereogram with laser light reconstruction (LCHS) is observed by binocular vision, the 3-D distortion characteristics of the image are studied. Using an object of a distinctive construction, some examples are calculated and experimental results are also shown, and the optimum condition to synthesize the LCHS is given. 相似文献
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柱透镜光栅的计算机辅助立体成像的基本原理是将二维序列图像进行切分和重组,使之以三维模型的形式展现,使合成的图像在柱透镜光栅下观察时具有"纵深感"。该项技术在广告、摄影、电影制作中具有广泛的应用。但是长期以来,在图像切分时并不能保证像素一定被整除,这意味着剩余像素的出现,合成的立体图像必然存在误差。如何处理剩余像素的问题一直是个难题,阻碍了该技术的推广。针对立体图像生成方法中的剩余像素问题,详尽地分析了误差的形成,并提出了强行取整算法和误差分散算法两种误差处理方法。实验表明,这两种算法能较好的处理剩余像素,增强了合成图像的立体效果,这将有助于立体成像技术的进一步推广。 相似文献
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Rigorous Remarks about Scaling Laws in Turbulent Fluids 总被引:1,自引:0,他引:1
F. Flandoli M. Gubinelli M. Hairer M. Romito 《Communications in Mathematical Physics》2008,278(1):1-29
A definition of scaling law for suitable families of measures is given and investigated. First, a number of necessary conditions
are proved. They imply the absence of scaling laws for 2D stochastic Navier-Stokes equations and for the stochastic Stokes
(linear) problem in any dimension, while they imply a lower bound on the mean vortex stretching in 3D. Second, for the 3D
stochastic Navier-Stokes equations, necessary and sufficient conditions for scaling laws to hold are given, translating the
problem into bounds for energy and enstrophy of high and low modes respectively. Unlike in the 2D case, the validity or invalidity
of such conditions in 3D remains open. 相似文献
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We propose a new multiple-exposure scheme for full-color full-parallax holographic three-dimensional (3D) printer, in which two of three primary-color holograms are exposed at the same location on the recording medium. In this paper, the optimal combinations of colors for multiple exposure are experimentally derived. In addition, it is shown that the proposed method enables higher brightness, better color reproducibility, and high resolution through the experiment of recording and measurement of color-chart holographic stereogram. 相似文献
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